feat(题单): 题单页重做——布置中的放最上面，详情顶上一条进度和奖章阶梯，没加入看得见题点不进；老师看全班、后台一屏编辑

- 列表：布置中的大卡片（做对几道、布置到哪天、再做对几道拿哪个奖章），其余小卡片，加入过的在前 - 详情：进度 + 奖章阶梯（下一个金圈「再做对 n 道」），题目两列写几点做对 / 交过几次；以前做对过的标「旧代码先藏着」；做完整条变绿，烟花只在做完那一刻放 - 老师多一个「全班情况」页签；题目页从链接直接进来没加入时，条上给「加入题单」 - 后台一屏编辑：布置一周 / 两周 / 四周 / 选日期，公开开关，粘贴多个题号一次加，拖动排序，奖章只剩两种条件 - 旧代码藏着的地方都说清楚是哪个题单、哪天之后能看 - 修掉列表卡片把选做题数说成「新加了 N 题」 Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
feat(题单): 「截止时间」改成「布置期」，布置期内没加入的人也藏旧代码；老师能看全班情况，后台一次加好几道题
2026-10-09 22:01:39 +08:00 · 2026-10-09 22:01:39 +08:00
43 changed files with 7588 additions and 2798 deletions
@@ -0,0 +1,10 @@
+-- 题单的「截止时间」改成「布置到」：它从来不截止任何东西，只管布置期内藏学生以前的代码（防抄），
+-- 见 services/problemset.ts 的 problemSetLockCutoffs。列名 end_time 不改（机房和服务器共库，
+-- 改名会让没升级的那边直接报错）；旧值是按旧语义填的（3 个题单，都已过期），清掉。
+ALTER TABLE "problemset" ADD COLUMN "assigned_at" timestamp with time zone;--> statement-breakpoint
+UPDATE "problemset" SET "end_time" = NULL;--> statement-breakpoint
+-- 「状态」和「可见」两道闸合成一个「公开」：草稿等于不公开，归档等于公开（一直都还能进）
+UPDATE "problemset" SET "visible" = false WHERE "status" = 'draft';--> statement-breakpoint
+UPDATE "problemset" SET "status" = 'active' WHERE "status" <> 'active';--> statement-breakpoint
+-- 分数拿掉了，「总分达到 N」的奖章换成「做对 N 道」（线上那几套题每题 10 分，门槛不变）
+UPDATE "problemset_badge" SET "condition_type" = 'problem_count', "condition_value" = GREATEST(1, CEIL("condition_value" / 10.0)) WHERE "condition_type" = 'score';
@@ -183,6 +183,13 @@
      "when": 1791521256834,
      "tag": "0025_submission_problem_user_idx",
      "breakpoints": true
+    },
+    {
+      "idx": 26,
+      "version": "7",
+      "when": 1791553481647,
+      "tag": "0026_problemset_assignment",
+      "breakpoints": true
    }
  ]
 }
@@ -417,7 +417,17 @@ export const problemset = pgTable(
    difficulty: text().notNull().$type<ProblemSetDifficulty>(),
    status: text().notNull().$type<ProblemSetStatus>(),
    createdById: integer("created_by_id").notNull(),
-    endTime: timestamp("end_time", { withTimezone: true, mode: "string" }),
+    /**
+     * 布置期：assignedAt 是这一轮布置开始的时刻，assignedUntil 是布置到哪天（东八区当天结束）。
+     * 布置期内，题单里这几道题学生在 assignedAt 之前交的代码先藏起来（防抄），见
+     * services/problemset.ts 的 problemSetLockCutoffs。不拦做题，过期照样做、照样记进度。
+     * 两个都为空 = 没布置。
+     *
+     * 列名还是 end_time（以前叫「截止时间」，名不副实）：机房那套和服务器共用这个库、
+     * 不一定同时升级，改列名会让没升级的那边一查题单就报错，所以只改代码里的名字
+     */
+    assignedUntil: timestamp("end_time", { withTimezone: true, mode: "string" }),
+    assignedAt: timestamp("assigned_at", { withTimezone: true, mode: "string" }),
  },
  (table) => [
    index("problemset_created_by_id_01b5197f").using(
@@ -1,18 +1,18 @@
 import {
-  addProblemToSetRequestSchema,
+  addProblemsToSetRequestSchema,
  createProblemSetBadgeRequestSchema,
  createProblemSetRequestSchema,
+  reorderProblemSetProblemsRequestSchema,
  updateProblemInSetRequestSchema,
  updateProblemSetBadgeRequestSchema,
  updateProblemSetRequestSchema,
-  updateProblemSetStatusRequestSchema,
+  type AddProblemsToSetResult,
  type AdminProblemSet,
  type AdminProblemSetBadge,
  type AdminProblemSetList,
  type AdminProblemSetProblem,
-  type AdminProblemSetProgress,
 } from "@oj2/contract"
-import { and, asc, count, desc, eq, ilike, inArray, isNull, or, sql } from "drizzle-orm"
+import { and, asc, count, desc, eq, ilike, inArray, isNull, max, or, sql } from "drizzle-orm"
 import { Hono } from "hono"

 import { requireTeacher, type AppEnv } from "../../auth/middleware"
@@ -20,7 +20,7 @@ import type { AuthUser } from "../../auth/session"
 import { db, schema } from "../../db"
 import { failure, parseBody, success } from "../../http"
 import { recalculateBadge, resyncProgress } from "../../services/problemset"
-import { asFilterValue, queryInteger, sampleUser } from "../helpers"
+import { queryInteger, sampleUser } from "../helpers"

 export const adminProblemSetRoutes = new Hono<AppEnv>()

@@ -49,11 +49,11 @@ async function serialize(row: typeof schema.problemset.$inferSelect) {
  return (await serializeMany([row]))[0]!
 }

-/** 批量版：列表接口走这个，固定 3 条查询，与行数无关（按行 serialize 就是 N+1） */
+/** 批量版：列表接口走这个，固定 4 条查询，与行数无关（按行 serialize 就是 N+1） */
 async function serializeMany(rows: (typeof schema.problemset.$inferSelect)[]) {
  if (rows.length === 0) return []
  const ids = rows.map((row) => row.id)
-  const [problems, participants, creators] = await Promise.all([
+  const [problems, participants, badges, creators] = await Promise.all([
    db
      .select({
        problemsetId: schema.problemsetProblem.problemsetId,
@@ -66,10 +66,19 @@ async function serializeMany(rows: (typeof schema.problemset.$inferSelect)[]) {
      .select({
        problemsetId: schema.problemsetProgress.problemsetId,
        value: count(),
+        completed: sql<number>`count(*) filter (where ${schema.problemsetProgress.isCompleted})::int`,
      })
      .from(schema.problemsetProgress)
      .where(inArray(schema.problemsetProgress.problemsetId, ids))
      .groupBy(schema.problemsetProgress.problemsetId),
+    db
+      .select({
+        problemsetId: schema.problemsetBadge.problemsetId,
+        value: count(),
+      })
+      .from(schema.problemsetBadge)
+      .where(inArray(schema.problemsetBadge.problemsetId, ids))
+      .groupBy(schema.problemsetBadge.problemsetId),
    db
      .select({
        id: schema.user.id,
@@ -81,27 +90,57 @@ async function serializeMany(rows: (typeof schema.problemset.$inferSelect)[]) {
      .where(inArray(schema.user.id, [...new Set(rows.map((row) => row.createdById))])),
  ])
  const problemsBySet = new Map(problems.map((item) => [item.problemsetId, item.value]))
-  const participantsBySet = new Map(participants.map((item) => [item.problemsetId, item.value]))
+  const participantsBySet = new Map(participants.map((item) => [item.problemsetId, item]))
+  const badgesBySet = new Map(badges.map((item) => [item.problemsetId, item.value]))
  const creatorById = new Map(creators.map((item) => [item.id, item]))
+  const now = Date.now()
  return rows.map((row) => {
    const creator = creatorById.get(row.createdById)
    return {
      id: row.id,
      title: row.title,
      description: row.description,
-      difficulty: row.difficulty,
-      status: row.status,
-      endTime: row.endTime,
+      assignedUntil: row.assignedUntil,
+      assignedAt: row.assignedAt,
+      assigning:
+        row.assignedAt !== null &&
+        row.assignedUntil !== null &&
+        Date.parse(row.assignedUntil) > now,
      visible: row.visible,
      createdBy: sampleUser(creator ?? { id: row.createdById, username: "" }, creator?.realName),
      createTime: row.createTime,
      lastUpdateTime: row.lastUpdateTime,
      problemsCount: problemsBySet.get(row.id) ?? 0,
-      participantCount: participantsBySet.get(row.id) ?? 0,
+      participantCount: participantsBySet.get(row.id)?.value ?? 0,
+      completedCount: participantsBySet.get(row.id)?.completed ?? 0,
+      badgeCount: badgesBySet.get(row.id) ?? 0,
    } satisfies AdminProblemSet
  })
 }

+/**
+ * 布置期怎么落库。老师给的是「布置到哪天」（东八区当天结束的时刻），开始时刻由服务端定：
+ *   - 不布置 → 两个都清掉；
+ *   - 现在正在布置 → 只改结束，开始不动（延长、缩短都不该把「以前的代码」的分界挪到现在）；
+ *   - 没在布置（从没布置过，或者上一轮已经过期）→ 开始记成现在，这就是「再布置一次」。
+ */
+function assignment(
+  requested: string | null,
+  current: { assignedAt: string | null; assignedUntil: string | null } | null,
+) {
+  if (requested === null) return { assignedAt: null, assignedUntil: null }
+  const until = Date.parse(requested)
+  if (!Number.isFinite(until) || until <= Date.now()) return "past" as const
+  const running =
+    current?.assignedAt != null &&
+    current.assignedUntil != null &&
+    Date.parse(current.assignedUntil) > Date.now()
+  return {
+    assignedAt: running ? current.assignedAt : new Date().toISOString(),
+    assignedUntil: new Date(until).toISOString(),
+  }
+}
+
 // ---------------------------------------------------------------- 题单本体

 adminProblemSetRoutes.get("/problem-sets", requireTeacher, async (c) => {
@@ -114,8 +153,6 @@ adminProblemSetRoutes.get("/problem-sets", requireTeacher, async (c) => {
  // 再也没法在界面上改回来。后台必须能看见自己管的全部题单。
  if (user.adminType !== "Super Admin") filters.push(eq(schema.problemset.createdById, user.id))
  const keyword = c.req.query("keyword")?.trim()
-  const difficulty = c.req.query("difficulty")?.trim()
-  const status = c.req.query("status")?.trim()
  if (keyword) {
    filters.push(
      or(
@@ -124,8 +161,6 @@ adminProblemSetRoutes.get("/problem-sets", requireTeacher, async (c) => {
      )!,
    )
  }
-  if (difficulty) filters.push(eq(schema.problemset.difficulty, asFilterValue(difficulty)))
-  if (status) filters.push(eq(schema.problemset.status, asFilterValue(status)))
  const where = filters.length ? and(...filters) : undefined

  const [totalRows, rows] = await Promise.all([
@@ -147,12 +182,19 @@ adminProblemSetRoutes.get("/problem-sets", requireTeacher, async (c) => {
 adminProblemSetRoutes.post("/problem-sets", requireTeacher, async (c) => {
  const parsed = await parseBody(c, createProblemSetRequestSchema)
  if (!parsed.success) return parsed.response
+  const period = assignment(parsed.data.assignedUntil, null)
+  if (period === "past") return failure(c, 400, "assign-in-past", "布置到的日期已经过了")
  const now = new Date().toISOString()
  const [created] = await db
    .insert(schema.problemset)
    .values({
-      ...parsed.data,
-      endTime: parsed.data.endTime ? new Date(parsed.data.endTime).toISOString() : null,
+      title: parsed.data.title,
+      description: parsed.data.description,
+      visible: parsed.data.visible,
+      ...period,
+      // 难度、状态两列还在表里、非空，但已经不用了（见契约 admin.ts 的说明）
+      difficulty: "Easy",
+      status: "active",
      createdById: c.get("user")!.id,
      createTime: now,
      lastUpdateTime: now,
@@ -172,11 +214,15 @@ adminProblemSetRoutes.put("/problem-sets/:id", requireTeacher, async (c) => {
  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
  const parsed = await parseBody(c, updateProblemSetRequestSchema)
  if (!parsed.success) return parsed.response
+  const period = assignment(parsed.data.assignedUntil, row)
+  if (period === "past") return failure(c, 400, "assign-in-past", "布置到的日期已经过了")
  const [updated] = await db
    .update(schema.problemset)
    .set({
-      ...parsed.data,
-      endTime: parsed.data.endTime ? new Date(parsed.data.endTime).toISOString() : null,
+      title: parsed.data.title,
+      description: parsed.data.description,
+      visible: parsed.data.visible,
+      ...period,
      lastUpdateTime: new Date().toISOString(),
    })
    .where(eq(schema.problemset.id, row.id))
@@ -196,22 +242,6 @@ adminProblemSetRoutes.put("/problem-sets/:id/visibility", requireTeacher, async
  return success(c, await serialize(updated!))
 })

-adminProblemSetRoutes.put("/problem-sets/:id/status", requireTeacher, async (c) => {
-  const row = await loadOwned(c, c.get("user")!)
-  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  const parsed = await parseBody(c, updateProblemSetStatusRequestSchema, "status 不合法")
-  if (!parsed.success) return parsed.response
-  const [updated] = await db
-    .update(schema.problemset)
-    .set({
-      status: parsed.data.status,
-      lastUpdateTime: new Date().toISOString(),
-    })
-    .where(eq(schema.problemset.id, row.id))
-    .returning()
-  return success(c, await serialize(updated!))
-})
-
 adminProblemSetRoutes.delete("/problem-sets/:id", requireTeacher, async (c) => {
  const row = await loadOwned(c, c.get("user")!)
  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
@@ -245,59 +275,97 @@ adminProblemSetRoutes.get("/problem-sets/:id/problems", requireTeacher, async (c
          difficulty: problem.difficulty,
          order: item.order,
          isRequired: item.isRequired,
-          score: item.score,
-          hint: item.hint,
        }) satisfies AdminProblemSetProblem,
    ),
  )
 })

+/**
+ * 加题：一次可以给好几个题号（后台搜索框里粘一串「3065 3066 3067」），按给的顺序接在最后。
+ * 找不到的、本来就在里面的不报错，分开报回去，前端告诉老师哪几个没加上。
+ */
 adminProblemSetRoutes.post("/problem-sets/:id/problems", requireTeacher, async (c) => {
  const row = await loadOwned(c, c.get("user")!)
  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  const parsed = await parseBody(c, addProblemToSetRequestSchema)
+  const parsed = await parseBody(c, addProblemsToSetRequestSchema)
  if (!parsed.success) return parsed.response
-  const [problem] = await db
-    .select({ id: schema.problem.id })
-    .from(schema.problem)
-    .where(
-      and(
-        sql`lower(${schema.problem.displayId}) = lower(${parsed.data.problemId})`,
-        eq(schema.problem.visible, true),
-        isNull(schema.problem.contestId),
+  const wanted = [...new Set(parsed.data.problemIds.map((id) => id.toLowerCase()))]
+  const [problems, existing, last] = await Promise.all([
+    db
+      .select({ id: schema.problem.id, displayId: schema.problem.displayId })
+      .from(schema.problem)
+      .where(
+        and(
+          inArray(sql<string>`lower(${schema.problem.displayId})`, wanted),
+          eq(schema.problem.visible, true),
+          isNull(schema.problem.contestId),
+        ),
      ),
-    )
-    .limit(1)
-  if (!problem) return failure(c, 404, "problem-not-found", "题目不存在或不可见")
+    db
+      .select({ problemId: schema.problemsetProblem.problemId })
+      .from(schema.problemsetProblem)
+      .where(eq(schema.problemsetProblem.problemsetId, row.id)),
+    db
+      .select({ value: max(schema.problemsetProblem.order) })
+      .from(schema.problemsetProblem)
+      .where(eq(schema.problemsetProblem.problemsetId, row.id)),
+  ])
+  const byDisplayId = new Map(problems.map((problem) => [problem.displayId.toLowerCase(), problem]))
+  const inSet = new Set(existing.map((item) => item.problemId))
+  const result: AddProblemsToSetResult = { added: [], missing: [], duplicate: [] }
+  const values: (typeof schema.problemsetProblem.$inferInsert)[] = []
+  let order = last[0]?.value ?? 0
+  for (const id of wanted) {
+    const problem = byDisplayId.get(id)
+    if (!problem) result.missing.push(id)
+    else if (inSet.has(problem.id)) result.duplicate.push(problem.displayId)
+    else {
+      inSet.add(problem.id)
+      order += 1
+      // 分数、提示两列还在表里但已经不用了：score 非空给 0
+      values.push({
+        problemsetId: row.id,
+        problemId: problem.id,
+        order,
+        isRequired: true,
+        score: 0,
+      })
+      result.added.push(problem.displayId)
+    }
+  }
+  if (values.length) {
+    await db.insert(schema.problemsetProblem).values(values)
+    // 题目集变了，已加入的人的分母、完成状态、奖章都得跟着变（旧栈靠 post_save 信号，
+    // 不在 views 里，别因为翻不到显式调用就以为它没做，见 services/problemset.ts）
+    await resyncProgress(row.id)
+  }
+  return success(c, result, values.length ? 201 : 200)
+})

-  const [duplicate] = await db
+// 必须注册在 /problems/:itemId 前面：Hono 按注册顺序匹配，order 会被当成 :itemId 吃掉
+adminProblemSetRoutes.put("/problem-sets/:id/problems/order", requireTeacher, async (c) => {
+  const row = await loadOwned(c, c.get("user")!)
+  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
+  const parsed = await parseBody(c, reorderProblemSetProblemsRequestSchema)
+  if (!parsed.success) return parsed.response
+  const links = await db
    .select({ id: schema.problemsetProblem.id })
    .from(schema.problemsetProblem)
-    .where(
-      and(
-        eq(schema.problemsetProblem.problemsetId, row.id),
-        eq(schema.problemsetProblem.problemId, problem.id),
-      ),
-    )
-    .limit(1)
-  if (duplicate) return failure(c, 409, "problem-already-in-set", "题目已在该题单中")
-
-  const [created] = await db
-    .insert(schema.problemsetProblem)
-    .values({
-      problemsetId: row.id,
-      problemId: problem.id,
-      order: parsed.data.order,
-      isRequired: parsed.data.isRequired,
-      score: parsed.data.score,
-      hint: parsed.data.hint,
-    })
-    .returning({ id: schema.problemsetProblem.id })
-  // 题目集变了，已加入的人的 totalProblemsCount / 百分比都得跟着变，
-  // 否则学生看到的进度分母还是老的。旧栈是靠 ProblemSetProblem 的 post_save 信号做的，
-  // 不在 views 里，别因为翻不到显式调用就以为它没做（见 services/problemset.ts）。
-  await resyncProgress(row.id)
-  return success(c, { id: created!.id }, 201)
+    .where(eq(schema.problemsetProblem.problemsetId, row.id))
+  const have = new Set(links.map((link) => link.id))
+  const given = new Set(parsed.data.ids)
+  if (given.size !== have.size || [...given].some((id) => !have.has(id))) {
+    return failure(c, 409, "problems-changed", "题目列表变了，刷新一下再排")
+  }
+  await db.transaction(async (tx) => {
+    for (const [index, id] of parsed.data.ids.entries()) {
+      await tx
+        .update(schema.problemsetProblem)
+        .set({ order: index + 1 })
+        .where(eq(schema.problemsetProblem.id, id))
+    }
+  })
+  return success(c, null)
 })

 adminProblemSetRoutes.put("/problem-sets/:id/problems/:itemId", requireTeacher, async (c) => {
@@ -316,7 +384,8 @@ adminProblemSetRoutes.put("/problem-sets/:id/problems/:itemId", requireTeacher,
    )
    .returning({ id: schema.problemsetProblem.id })
  if (updated.length === 0) return failure(c, 404, "problem-not-in-set", "题目不在该题单中")
-  if (parsed.data.score !== undefined) await resyncProgress(row.id)
+  // 必做 / 选做变了，分母和「做完」跟着变
+  await resyncProgress(row.id)
  return success(c, null)
 })

@@ -453,84 +522,3 @@ adminProblemSetRoutes.delete("/problem-sets/:id/badges/:badgeId", requireTeacher
  await db.delete(schema.problemsetBadge).where(eq(schema.problemsetBadge.id, badge.id))
  return success(c, null)
 })
-
-// ---------------------------------------------------------------- 学生进度
-
-adminProblemSetRoutes.get("/problem-sets/:id/progress", requireTeacher, async (c) => {
-  const row = await loadOwned(c, c.get("user")!)
-  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  const rows = await db
-    .select({
-      progress: schema.problemsetProgress,
-      username: schema.user.username,
-      realName: schema.userProfile.realName,
-    })
-    .from(schema.problemsetProgress)
-    .innerJoin(schema.user, eq(schema.problemsetProgress.userId, schema.user.id))
-    .leftJoin(schema.userProfile, eq(schema.userProfile.userId, schema.user.id))
-    .where(eq(schema.problemsetProgress.problemsetId, row.id))
-    .orderBy(desc(schema.problemsetProgress.joinTime))
-  return success(
-    c,
-    rows.map(
-      ({ progress, username, realName }) =>
-        ({
-          id: progress.id,
-          userId: progress.userId,
-          username,
-          // 真名有意下发：这是老师看本班完成情况的页面，已由 requireTeacher + 归属校验把关
-          realName,
-          joinTime: progress.joinTime,
-          completeTime: progress.completeTime,
-          isCompleted: progress.isCompleted,
-          progressPercentage: progress.progressPercentage,
-          completedProblemsCount: progress.completedProblemsCount,
-          totalProblemsCount: progress.totalProblemsCount,
-          totalScore: progress.totalScore,
-        }) satisfies AdminProblemSetProgress,
-    ),
-  )
-})
-
-adminProblemSetRoutes.delete("/problem-sets/:id/progress/:userId", requireTeacher, async (c) => {
-  const row = await loadOwned(c, c.get("user")!)
-  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  const userId = queryInteger(c.req.param("userId"), 0, { min: 1 })
-  const deleted = await db.transaction(async (tx) => {
-    // 把人踢出题单，他基于这份题单拿到的奖章也该收回，否则奖章会悬空
-    const badges = await tx
-      .select({ id: schema.problemsetBadge.id })
-      .from(schema.problemsetBadge)
-      .where(eq(schema.problemsetBadge.problemsetId, row.id))
-    if (badges.length) {
-      await tx.delete(schema.userBadge).where(
-        and(
-          eq(schema.userBadge.userId, userId),
-          inArray(
-            schema.userBadge.badgeId,
-            badges.map((badge) => badge.id),
-          ),
-        ),
-      )
-    }
-    await tx
-      .delete(schema.problemsetSubmission)
-      .where(
-        and(
-          eq(schema.problemsetSubmission.problemsetId, row.id),
-          eq(schema.problemsetSubmission.userId, userId),
-        ),
-      )
-    return tx
-      .delete(schema.problemsetProgress)
-      .where(
-        and(
-          eq(schema.problemsetProgress.problemsetId, row.id),
-          eq(schema.problemsetProgress.userId, userId),
-        ),
-      )
-      .returning({ id: schema.problemsetProgress.id })
-  })
-  if (deleted.length === 0) return failure(c, 404, "progress-not-found", "用户未加入该题单")
-  return success(c, null)
-})
@@ -23,7 +23,7 @@ import { db, schema } from "../db"
 import { failure, readJson, success } from "../http"
 import { flowchartQueue } from "../queue"
 import { getBooleanOption } from "../services/options"
-import { problemSetJoinTimes } from "../services/problemset"
+import { problemSetLockCutoffs } from "../services/problemset"
 import { consumeToken } from "../services/throttling"
 import { buildWordFrequencies } from "../services/word-frequency"
 import { dayStart } from "../time"
@@ -49,36 +49,36 @@ function flowchartThrottleKey(userId: number) {
 }

 /**
- * 题单防抄：学生加入含这道题的题单之前画的图，先对他本人藏起来 —— 和代码提交同一道闸
- * （routes/submission.ts 的 canViewSubmission，规则见 problemSetJoinTimes）。原来流程图
- * 这边没有这一条，加入题单之前画到 A 的那张图点一下就能载回画布，交上去就是 A。
+ * 题单防抄：题单布置期内，学生在布置开始之前画的图先对他本人藏起来 —— 和代码提交同一道闸
+ * （routes/submission.ts 的 canViewSubmission，规则见 problemSetLockCutoffs）。原来流程图
+ * 这边没有这一条，以前画到 A 的那张图点一下就能载回画布，交上去就是 A。
 */
 function hiddenByProblemSet(
  user: AuthUser,
  row: { userId: number; problemId: number; createTime: string },
-  joinTimes: Map<number, string>,
+  cutoffs: Map<number, string>,
 ) {
  if (row.userId !== user.id || isTeacherOrAbove(user)) return false
-  const joinTime = joinTimes.get(row.problemId)
-  return joinTime !== undefined && Date.parse(row.createTime) < Date.parse(joinTime)
+  const cutoff = cutoffs.get(row.problemId)
+  return cutoff !== undefined && Date.parse(row.createTime) < Date.parse(cutoff)
 }

 function canView(
  user: AuthUser,
  row: { userId: number; problemId: number; createTime: string },
  problem: { createdById: number },
-  joinTimes: Map<number, string>,
+  cutoffs: Map<number, string>,
 ) {
-  if (hiddenByProblemSet(user, row, joinTimes)) return false
+  if (hiddenByProblemSet(user, row, cutoffs)) return false
  // 角色捷径只给老师：学生管理员算学生，不能看同学的流程图（同 submission.ts 的 canViewSubmission）
  return row.userId === user.id || isTeacherOrAbove(user) || problem.createdById === user.id
 }

 /** 只有学生看自己的提交时才需要查题单；其余情况给一张空表，省一次查询 */
-function joinTimesFor(user: AuthUser, rows: Array<{ userId: number; problemId: number }>) {
+function cutoffsFor(user: AuthUser, rows: Array<{ userId: number; problemId: number }>) {
  if (isTeacherOrAbove(user)) return Promise.resolve(new Map<number, string>())
  const own = rows.filter((row) => row.userId === user.id).map((row) => row.problemId)
-  return problemSetJoinTimes(user.id, [...new Set(own)])
+  return problemSetLockCutoffs(user.id, [...new Set(own)])
 }

 function flowchartData(
@@ -321,7 +321,7 @@ flowchartRoutes.get("/flowcharts", requireAuth, async (c) => {
      .offset(offset),
    displayId ? unknownDisplayIds(displayId, null) : [],
  ])
-  const joinTimes = await joinTimesFor(
+  const cutoffs = await cutoffsFor(
    user,
    rows.map((row) => row.flowchart),
  )
@@ -341,7 +341,7 @@ flowchartRoutes.get("/flowcharts", requireAuth, async (c) => {
          aiModel: flowchart.aiModel,
          processingTime: flowchart.processingTime,
          evaluationTime: flowchart.evaluationTime,
-          showLink: canView(user, flowchart, problem, joinTimes),
+          showLink: canView(user, flowchart, problem, cutoffs),
        }) satisfies FlowchartListItem,
    ),
    total: totalRows[0]?.value ?? 0,
@@ -656,7 +656,7 @@ flowchartRoutes.get("/flowcharts/:id", requireAuth, async (c) => {
    .where(eq(schema.flowchartSubmission.id, c.req.param("id")))
    .limit(1)
  const user = c.get("user")!
-  if (!row || !canView(user, row.flowchart, row.problem, await joinTimesFor(user, [row.flowchart])))
+  if (!row || !canView(user, row.flowchart, row.problem, await cutoffsFor(user, [row.flowchart])))
    return failure(c, 404, "flowchart-not-found", "Submission does not exist")
  return success(c, flowchartData(row.flowchart, row.username))
 })
@@ -669,7 +669,7 @@ flowchartRoutes.post("/flowcharts/:id/retry", requireAuth, async (c) => {
    .innerJoin(schema.problem, eq(schema.flowchartSubmission.problemId, schema.problem.id))
    .where(eq(schema.flowchartSubmission.id, c.req.param("id")))
    .limit(1)
-  if (!row || !canView(user, row.flowchart, row.problem, await joinTimesFor(user, [row.flowchart])))
+  if (!row || !canView(user, row.flowchart, row.problem, await cutoffsFor(user, [row.flowchart])))
    return failure(c, 404, "flowchart-not-found", "Submission does not exist")
  // 看得见不等于能重评：canView 放进来的出题人只能看。重评会清掉原来的
  // 评分再抽一次，别人的提交只有老师能动
@@ -737,7 +737,7 @@ flowchartRoutes.post("/flowcharts/:id/retry", requireAuth, async (c) => {
 * userId / problemId / createTime 三列是 hiddenByProblemSet 要的，别删。
 */
 async function myEvaluatedFlowcharts(user: AuthUser, problemId: number) {
-  const [rows, joinTimes] = await Promise.all([
+  const [rows, cutoffs] = await Promise.all([
    db
      .select({
        id: schema.flowchartSubmission.id,
@@ -756,9 +756,9 @@ async function myEvaluatedFlowcharts(user: AuthUser, problemId: number) {
        ),
      )
      .orderBy(asc(schema.flowchartSubmission.createTime)),
-    joinTimesFor(user, [{ userId: user.id, problemId }]),
+    cutoffsFor(user, [{ userId: user.id, problemId }]),
  ])
-  const visible = rows.filter((row) => !hiddenByProblemSet(user, row, joinTimes))
+  const visible = rows.filter((row) => !hiddenByProblemSet(user, row, cutoffs))
  return { visible, hidden: rows.length - visible.length }
 }

@@ -1,44 +1,83 @@
 import {
  joinProblemSetRequestSchema,
+  STUDENT_ROLES,
  type ProblemSet,
  type ProblemSetBadge,
+  type ProblemSetClassView,
  type ProblemSetList,
+  type ProblemSetLock,
  type ProblemSetProblem,
-  type ProblemSetProgress,
-  type ProblemSetProgressList,
  type UserBadge,
 } from "@oj2/contract"
-import { and, asc, avg, count, desc, eq, gt, ilike, inArray, ne, or, sql } from "drizzle-orm"
+import { and, asc, count, desc, eq, ilike, inArray, isNull, notInArray, or, sql } from "drizzle-orm"
 import { Hono } from "hono"

 import { optionalAuth, requireAuth, requireTeacher, type AppEnv } from "../auth/middleware"
+import type { AuthUser } from "../auth/session"
 import { db, schema } from "../db"
 import { failure, parseBody, success } from "../http"
-import { computeProgress } from "../services/problemset"
-import { asFilterValue, asRecord, classPrefixCondition, queryInteger, sampleUser } from "./helpers"
+import { JudgeStatus, NON_FAILURE_RESULTS } from "../judge/status"
+import {
+  assigningSql,
+  computeProgress,
+  problemSetLockCutoffs,
+  problemSetLocksFor,
+} from "../services/problemset"
+import { asRecord, isTeacherOrAbove, queryInteger, sampleUser } from "./helpers"

 export const problemsetRoutes = new Hono<AppEnv>()

 type ProblemSetRow = typeof schema.problemset.$inferSelect
+type ProgressRow = typeof schema.problemsetProgress.$inferSelect

-function progressSummary(progress: typeof schema.problemsetProgress.$inferSelect | undefined) {
+const SOLVED_RESULTS = [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED]
+
+/** 必做题的 problemId；一道必做都没标的题单退回全部（和 computeProgress 同一个口径） */
+function gradedIds(links: { problemId: number; isRequired: boolean }[]) {
+  const required = links.filter((link) => link.isRequired)
+  return new Set((required.length ? required : links).map((link) => link.problemId))
+}
+
+function progressSummary(progress: ProgressRow | undefined) {
  return progress
    ? {
        isJoined: true,
-        progressPercentage: progress.progressPercentage,
+        joinTime: progress.joinTime,
        completedCount: progress.completedProblemsCount,
        totalCount: progress.totalProblemsCount,
+        solvedCount: Object.keys(asRecord(progress.progressDetail)).length,
        isCompleted: progress.isCompleted,
+        completeTime: progress.completeTime,
      }
    : {
        isJoined: false,
-        progressPercentage: 0,
+        joinTime: null,
        completedCount: 0,
        totalCount: 0,
+        solvedCount: 0,
        isCompleted: false,
+        completeTime: null,
      }
 }

+/**
+ * 学生能看到的题单：公开的。老师连没公开的也能打开 —— 后台编辑完要到前台看看学生
+ * 看到的样子、看全班情况，不该被 404 挡在外面。
+ */
+async function loadVisible(id: number, user: AuthUser | null | undefined) {
+  const [row] = await db
+    .select({ set: schema.problemset, assigning: assigningSql })
+    .from(schema.problemset)
+    .where(
+      and(
+        eq(schema.problemset.id, id),
+        isTeacherOrAbove(user) ? undefined : eq(schema.problemset.visible, true),
+      ),
+    )
+    .limit(1)
+  return row ?? null
+}
+
 async function problemSetCreators(ids: number[]) {
  const map = new Map<number, ReturnType<typeof sampleUser>>()
  if (ids.length === 0) return map
@@ -55,7 +94,7 @@ async function problemSetCreators(ids: number[]) {
  return map
 }

-function badgeData(badge: typeof schema.problemsetBadge.$inferSelect, earned?: boolean) {
+function badgeData(badge: typeof schema.problemsetBadge.$inferSelect, earnedTime?: string | null) {
  return {
    id: badge.id,
    problemSetId: badge.problemsetId,
@@ -64,70 +103,79 @@ function badgeData(badge: typeof schema.problemsetBadge.$inferSelect, earned?: b
    icon: badge.icon,
    conditionType: badge.conditionType,
    conditionValue: badge.conditionValue,
-    isEarned: earned,
+    isEarned: earnedTime === undefined ? undefined : earnedTime !== null,
+    earnedTime,
  } satisfies ProblemSetBadge
 }

 /**
 * 一次把整页题单的附属数据全查回来，再在内存里按 problemsetId 分组。
- *
- * 以前是每行 5 条查询（题目数 / 我的进度 / 奖章 / 已获奖章 / 创建者），
- * limit 最大 250 就是 1250 次往返。这里固定 5 条，与行数无关。
+ * 固定 6 条查询，与行数无关（按行查就是 N+1）。
 */
-async function serializeProblemSets(rows: ProblemSetRow[], userId?: number, includeBadges = false) {
+async function serializeProblemSets(
+  rows: { set: ProblemSetRow; assigning: boolean }[],
+  userId?: number,
+) {
  if (rows.length === 0) return []
-  const ids = rows.map((row) => row.id)
-  const [problemCounts, progresses, badges, earnedRows, creators] = await Promise.all([
-    db
-      .select({
-        problemsetId: schema.problemsetProblem.problemsetId,
-        value: count(),
-      })
-      .from(schema.problemsetProblem)
-      .where(inArray(schema.problemsetProblem.problemsetId, ids))
-      .groupBy(schema.problemsetProblem.problemsetId),
-    userId
-      ? db
-          .select()
-          .from(schema.problemsetProgress)
-          .where(
-            and(
-              inArray(schema.problemsetProgress.problemsetId, ids),
-              eq(schema.problemsetProgress.userId, userId),
-            ),
-          )
-      : Promise.resolve([] as (typeof schema.problemsetProgress.$inferSelect)[]),
-    includeBadges
-      ? db
-          .select()
-          .from(schema.problemsetBadge)
-          .where(inArray(schema.problemsetBadge.problemsetId, ids))
-          .orderBy(asc(schema.problemsetBadge.id))
-      : Promise.resolve([] as (typeof schema.problemsetBadge.$inferSelect)[]),
-    includeBadges && userId
-      ? db
-          .select({ id: schema.userBadge.badgeId })
-          .from(schema.userBadge)
-          .innerJoin(
-            schema.problemsetBadge,
-            eq(schema.userBadge.badgeId, schema.problemsetBadge.id),
-          )
-          .where(
-            and(
-              eq(schema.userBadge.userId, userId),
-              inArray(schema.problemsetBadge.problemsetId, ids),
-            ),
-          )
-      : Promise.resolve([] as { id: number }[]),
-    problemSetCreators([...new Set(rows.map((row) => row.createdById))]),
-  ])
-  const countBySet = new Map(problemCounts.map((item) => [item.problemsetId, item.value]))
+  const ids = rows.map((row) => row.set.id)
+  const [problemCounts, joinedCounts, progresses, badges, earnedRows, creators] = await Promise.all(
+    [
+      db
+        .select({
+          problemsetId: schema.problemsetProblem.problemsetId,
+          value: count(),
+          required: sql<number>`count(*) filter (where ${schema.problemsetProblem.isRequired})::int`,
+        })
+        .from(schema.problemsetProblem)
+        .where(inArray(schema.problemsetProblem.problemsetId, ids))
+        .groupBy(schema.problemsetProblem.problemsetId),
+      db
+        .select({ problemsetId: schema.problemsetProgress.problemsetId, value: count() })
+        .from(schema.problemsetProgress)
+        .where(inArray(schema.problemsetProgress.problemsetId, ids))
+        .groupBy(schema.problemsetProgress.problemsetId),
+      userId
+        ? db
+            .select()
+            .from(schema.problemsetProgress)
+            .where(
+              and(
+                inArray(schema.problemsetProgress.problemsetId, ids),
+                eq(schema.problemsetProgress.userId, userId),
+              ),
+            )
+        : Promise.resolve([] as ProgressRow[]),
+      db
+        .select()
+        .from(schema.problemsetBadge)
+        .where(inArray(schema.problemsetBadge.problemsetId, ids))
+        .orderBy(asc(schema.problemsetBadge.id)),
+      userId
+        ? db
+            .select({ id: schema.userBadge.badgeId, earnedTime: schema.userBadge.earnedTime })
+            .from(schema.userBadge)
+            .innerJoin(
+              schema.problemsetBadge,
+              eq(schema.userBadge.badgeId, schema.problemsetBadge.id),
+            )
+            .where(
+              and(
+                eq(schema.userBadge.userId, userId),
+                inArray(schema.problemsetBadge.problemsetId, ids),
+              ),
+            )
+        : Promise.resolve([] as { id: number; earnedTime: string }[]),
+      problemSetCreators([...new Set(rows.map((row) => row.set.createdById))]),
+    ],
+  )
+  const countBySet = new Map(problemCounts.map((item) => [item.problemsetId, item]))
+  const joinedBySet = new Map(joinedCounts.map((item) => [item.problemsetId, item.value]))
  const progressBySet = new Map(progresses.map((item) => [item.problemsetId, item]))
  const badgesBySet = new Map<number, (typeof schema.problemsetBadge.$inferSelect)[]>()
  for (const badge of badges)
    badgesBySet.set(badge.problemsetId, [...(badgesBySet.get(badge.problemsetId) ?? []), badge])
-  const earned = new Set(earnedRows.map((item) => item.id))
-  return rows.map((row) => {
+  const earned = new Map(earnedRows.map((item) => [item.id, item.earnedTime]))
+  return rows.map(({ set: row, assigning }) => {
    const progress = progressBySet.get(row.id)
    return {
      id: row.id,
@@ -136,17 +184,16 @@ async function serializeProblemSets(rows: ProblemSetRow[], userId?: number, incl
      createdBy:
        creators.get(row.createdById) ?? sampleUser({ id: row.createdById, username: "" }, null),
      createTime: row.createTime,
-      lastUpdateTime: row.lastUpdateTime,
-      difficulty: row.difficulty,
-      status: row.status,
-      endTime: row.endTime,
-      visible: row.visible,
-      problemsCount: countBySet.get(row.id) ?? 0,
-      completedCount: progress?.completedProblemsCount ?? 0,
+      assignedUntil: row.assignedUntil,
+      assigning,
+      problemsCount: countBySet.get(row.id)?.value ?? 0,
+      // 一道必做都没标的题单退回「全部都算必做」，和 computeProgress 同一个口径
+      requiredCount: countBySet.get(row.id)?.required || (countBySet.get(row.id)?.value ?? 0),
+      joinedCount: joinedBySet.get(row.id) ?? 0,
      userProgress: progressSummary(progress),
-      badges: includeBadges
-        ? (badgesBySet.get(row.id) ?? []).map((badge) => badgeData(badge, earned.has(badge.id)))
-        : undefined,
+      badges: (badgesBySet.get(row.id) ?? []).map((badge) =>
+        badgeData(badge, userId ? (earned.get(badge.id) ?? null) : undefined),
+      ),
    } satisfies ProblemSet
  })
 }
@@ -154,10 +201,8 @@ async function serializeProblemSets(rows: ProblemSetRow[], userId?: number, incl
 problemsetRoutes.get("/problem-sets", optionalAuth, async (c) => {
  const limit = queryInteger(c.req.query("limit"), 10, { min: 1, max: 250 })
  const offset = queryInteger(c.req.query("offset"), 0, { min: 0 })
-  const filters = [eq(schema.problemset.visible, true), ne(schema.problemset.status, "draft")]
+  const filters = [eq(schema.problemset.visible, true)]
  const keyword = c.req.query("keyword")?.trim()
-  const difficulty = c.req.query("difficulty")?.trim()
-  const status = c.req.query("status")?.trim()
  if (keyword)
    filters.push(
      or(
@@ -165,13 +210,11 @@ problemsetRoutes.get("/problem-sets", optionalAuth, async (c) => {
        ilike(schema.problemset.description, `%${keyword}%`),
      )!,
    )
-  if (difficulty) filters.push(eq(schema.problemset.difficulty, asFilterValue(difficulty)))
-  if (status) filters.push(eq(schema.problemset.status, asFilterValue(status)))
  const where = and(...filters)
  const [totalRows, rows] = await Promise.all([
    db.select({ value: count() }).from(schema.problemset).where(where),
    db
-      .select()
+      .select({ set: schema.problemset, assigning: assigningSql })
      .from(schema.problemset)
      .where(where)
      .orderBy(desc(schema.problemset.createTime))
@@ -179,49 +222,45 @@ problemsetRoutes.get("/problem-sets", optionalAuth, async (c) => {
      .offset(offset),
  ])
  return success(c, {
-    results: await serializeProblemSets(rows, c.get("user")?.id, true),
+    results: await serializeProblemSets(rows, c.get("user")?.id),
    total: totalRows[0]?.value ?? 0,
  } satisfies ProblemSetList)
 })

+// 字面量路由要排在 /problem-sets/:id 前面：Hono 按注册顺序匹配，不是静态优先
+// 题号（problemDisplayId）和主键（problemId）都认：提交列表那边手里只有题号
+problemsetRoutes.get("/problem-sets/locks", requireAuth, async (c) => {
+  const user = c.get("user")!
+  if (isTeacherOrAbove(user)) return success(c, [] as ProblemSetLock[])
+  let problemId = queryInteger(c.req.query("problemId"), 0, { min: 1 })
+  const displayId = c.req.query("problemDisplayId")?.trim()
+  if (!problemId && displayId) {
+    const [problem] = await db
+      .select({ id: schema.problem.id })
+      .from(schema.problem)
+      .where(and(eq(schema.problem.displayId, displayId), isNull(schema.problem.contestId)))
+      .limit(1)
+    problemId = problem?.id ?? 0
+  }
+  if (!problemId) return success(c, [] as ProblemSetLock[])
+  const rows = await problemSetLocksFor(user.id, problemId)
+  return success(c, rows satisfies ProblemSetLock[])
+})
+
 problemsetRoutes.get("/problem-sets/:id", optionalAuth, async (c) => {
-  const id = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const [row] = await db
-    .select()
-    .from(schema.problemset)
-    .where(
-      and(
-        eq(schema.problemset.id, id),
-        eq(schema.problemset.visible, true),
-        ne(schema.problemset.status, "draft"),
-      ),
-    )
-    .limit(1)
+  const row = await loadVisible(queryInteger(c.req.param("id"), 0, { min: 1 }), c.get("user"))
  if (!row) return failure(c, 404, "problem-set-not-found", "题单不存在")
  const [data] = await serializeProblemSets([row], c.get("user")?.id)
  return success(c, data)
 })

 problemsetRoutes.get("/problem-sets/:id/problems", optionalAuth, async (c) => {
-  const id = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const [problemSet] = await db
-    .select({ id: schema.problemset.id })
-    .from(schema.problemset)
-    .where(
-      and(
-        eq(schema.problemset.id, id),
-        eq(schema.problemset.visible, true),
-        ne(schema.problemset.status, "draft"),
-      ),
-    )
-    .limit(1)
-  if (!problemSet) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  // 只取卡片要渲染的四列。取 schema.problem 整行会把题面、样例、答案、ast_rules、
-  // flowchart_data、sql_display 一起拉回来，题单页一个都不用。
-  //
-  // order 后面必须再跟一个 tiebreaker：并列时 Postgres 不保证次序，而卡片是按数组
-  // 下标编号的（#1 #2 #3），题单 8 / 11 / 14 实际就存在 order 重复，不定死的话
-  // 「第 3 题」指哪道题每次刷新都可能不一样。后台那条列表一直是这么排的。
+  const user = c.get("user")
+  const found = await loadVisible(queryInteger(c.req.param("id"), 0, { min: 1 }), user)
+  if (!found) return failure(c, 404, "problem-set-not-found", "题单不存在")
+  const id = found.set.id
+  // order 后面必须再跟一个 tiebreaker：并列时 Postgres 不保证次序，而题目是按数组下标
+  // 编号的（1、2、3），老题单里 order 大量重复，不定死的话「第 3 题」每次刷新都可能变
  const rows = await db
    .select({
      link: schema.problemsetProblem,
@@ -234,76 +273,86 @@ problemsetRoutes.get("/problem-sets/:id/problems", optionalAuth, async (c) => {
    .innerJoin(schema.problem, eq(schema.problemsetProblem.problemId, schema.problem.id))
    .where(eq(schema.problemsetProblem.problemsetId, id))
    .orderBy(asc(schema.problemsetProblem.order), asc(schema.problemsetProblem.id))
-  const progressRows = c.get("user")
-    ? await db
-        .select({ detail: schema.problemsetProgress.progressDetail })
-        .from(schema.problemsetProgress)
-        .where(
-          and(
-            eq(schema.problemsetProgress.problemsetId, id),
-            eq(schema.problemsetProgress.userId, c.get("user")!.id),
-          ),
-        )
-        .limit(1)
-    : []
-  const completed = asRecord(progressRows[0]?.detail)
+  const problemIds = rows.map((row) => row.problemId)
+  const [progressRows, wrongRows, cutoffs] = user
+    ? await Promise.all([
+        db
+          .select({ detail: schema.problemsetProgress.progressDetail })
+          .from(schema.problemsetProgress)
+          .where(
+            and(
+              eq(schema.problemsetProgress.problemsetId, id),
+              eq(schema.problemsetProgress.userId, user.id),
+            ),
+          )
+          .limit(1),
+        db
+          .select({ problemId: schema.submission.problemId, value: count() })
+          .from(schema.submission)
+          .where(
+            and(
+              eq(schema.submission.userId, user.id),
+              eq(schema.submission.problemsetId, id),
+              notInArray(schema.submission.result, NON_FAILURE_RESULTS),
+            ),
+          )
+          .groupBy(schema.submission.problemId),
+        isTeacherOrAbove(user)
+          ? new Map<number, string>()
+          : problemSetLockCutoffs(user.id, problemIds),
+      ])
+    : [[], [], new Map<number, string>()]
+  // 「以前做对过 · 旧代码先藏着」：这道题正被闸门挡着，而且分界之前确实做对过
+  const hiddenSolved =
+    user && cutoffs.size
+      ? await db
+          .select({ problemId: schema.submission.problemId })
+          .from(schema.submission)
+          .where(
+            and(
+              eq(schema.submission.userId, user.id),
+              inArray(schema.submission.problemId, [...cutoffs.keys()]),
+              inArray(schema.submission.result, SOLVED_RESULTS),
+              or(
+                ...[...cutoffs].map(
+                  ([problemId, cutoff]) =>
+                    sql`(${schema.submission.problemId} = ${problemId} and ${schema.submission.createTime} < ${cutoff})`,
+                ),
+              ),
+            ),
+          )
+          .groupBy(schema.submission.problemId)
+      : []
+  const hidden = new Set(hiddenSolved.map((row) => row.problemId))
+  const solved = asRecord(progressRows[0]?.detail)
+  const wrong = new Map(wrongRows.map((row) => [row.problemId, row.value]))
  return success(
    c,
-    rows.map(
-      ({ link, problemId, displayId, title, difficulty }) =>
-        ({
-          id: link.id,
-          problemSetId: link.problemsetId,
-          problem: { id: problemId, _id: displayId, title, difficulty },
-          order: link.order,
-          isRequired: link.isRequired,
-          score: link.score,
-          hint: link.hint,
-          isCompleted: String(problemId) in completed,
-        }) satisfies ProblemSetProblem,
-    ),
+    rows.map(({ link, problemId, displayId, title, difficulty }) => {
+      const entry = solved[String(problemId)]
+      const solvedTime = entry === undefined ? null : asRecord(entry).submit_time
+      return {
+        id: link.id,
+        problemSetId: link.problemsetId,
+        problem: { id: problemId, _id: displayId, title, difficulty },
+        order: link.order,
+        isRequired: link.isRequired,
+        isCompleted: entry !== undefined,
+        solvedTime: typeof solvedTime === "string" ? solvedTime : null,
+        wrongCount: wrong.get(problemId) ?? 0,
+        oldCodeHidden: hidden.has(problemId),
+      } satisfies ProblemSetProblem
+    }),
  )
 })

-async function recomputeProgress(
-  tx: Parameters<Parameters<typeof db.transaction>[0]>[0],
-  progress: typeof schema.problemsetProgress.$inferSelect,
-  detail: Record<string, unknown>,
-) {
-  const links = await tx
-    .select({
-      problemId: schema.problemsetProblem.problemId,
-      score: schema.problemsetProblem.score,
-      isRequired: schema.problemsetProblem.isRequired,
-    })
-    .from(schema.problemsetProblem)
-    .where(eq(schema.problemsetProblem.problemsetId, progress.problemsetId))
-  // 算法本身在 services/problemset.ts —— 后台改题目后的批量重算走的是同一份，
-  // 两边曾经各写一遍，结果后台那份少算了 total_score 和 is_completed
-  const update = computeProgress(detail, links, progress.completeTime)
-  await tx
-    .update(schema.problemsetProgress)
-    .set(update)
-    .where(eq(schema.problemsetProgress.id, progress.id))
-  return { ...progress, ...update }
-}
-
 problemsetRoutes.post("/problem-set-progress", requireAuth, async (c) => {
  const parsed = await parseBody(c, joinProblemSetRequestSchema, "Invalid problem set")
  if (!parsed.success) return parsed.response
  const user = c.get("user")!
-  const [problemSet] = await db
-    .select({ id: schema.problemset.id })
-    .from(schema.problemset)
-    .where(
-      and(
-        eq(schema.problemset.id, parsed.data.problemSetId),
-        eq(schema.problemset.visible, true),
-        ne(schema.problemset.status, "draft"),
-      ),
-    )
-    .limit(1)
-  if (!problemSet) return failure(c, 404, "problem-set-not-found", "题单不存在")
+  const found = await loadVisible(parsed.data.problemSetId, user)
+  if (!found) return failure(c, 404, "problem-set-not-found", "题单不存在")
+  const problemSet = found.set
  const [existing] = await db
    .select({ id: schema.problemsetProgress.id })
    .from(schema.problemsetProgress)
@@ -316,22 +365,21 @@ problemsetRoutes.post("/problem-set-progress", requireAuth, async (c) => {
    .limit(1)
  if (existing) return failure(c, 409, "already-joined", "已经加入该题单")
  await db.transaction(async (tx) => {
-    const [created] = await tx
-      .insert(schema.problemsetProgress)
-      .values({
-        problemsetId: problemSet.id,
-        userId: user.id,
-        joinTime: new Date().toISOString(),
-        completeTime: null,
-        isCompleted: false,
-        progressPercentage: 0,
-        completedProblemsCount: 0,
-        totalProblemsCount: 0,
-        totalScore: 0,
-        progressDetail: {},
+    const links = await tx
+      .select({
+        problemId: schema.problemsetProblem.problemId,
+        score: schema.problemsetProblem.score,
+        isRequired: schema.problemsetProblem.isRequired,
      })
-      .returning()
-    if (created) await recomputeProgress(tx, created, {})
+      .from(schema.problemsetProblem)
+      .where(eq(schema.problemsetProblem.problemsetId, problemSet.id))
+    // 算法本身在 services/problemset.ts —— 后台改题目后的批量重算走的是同一份
+    await tx.insert(schema.problemsetProgress).values({
+      problemsetId: problemSet.id,
+      userId: user.id,
+      joinTime: new Date().toISOString(),
+      ...computeProgress({}, links, null),
+    })
  })
  return success(c, null, 201)
 })
@@ -372,137 +420,198 @@ problemsetRoutes.get("/users/:username/badges", optionalAuth, async (c) => {
  )
 })

-problemsetRoutes.get("/problem-sets/:id/badges", async (c) => {
-  const id = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const [problemSet] = await db
-    .select({ id: schema.problemset.id })
-    .from(schema.problemset)
-    .where(
-      and(
-        eq(schema.problemset.id, id),
-        eq(schema.problemset.visible, true),
-        ne(schema.problemset.status, "draft"),
-      ),
-    )
-    .limit(1)
-  if (!problemSet) return failure(c, 404, "problem-set-not-found", "题单不存在")
-  const badges = await db
-    .select()
-    .from(schema.problemsetBadge)
-    .where(eq(schema.problemsetBadge.problemsetId, id))
-  return success(
-    c,
-    badges.map((badge) => badgeData(badge)),
-  )
-})
-
-problemsetRoutes.get("/problem-sets/:id/user-progress", requireTeacher, async (c) => {
-  const id = queryInteger(c.req.param("id"), 0, { min: 1 })
-  const [problemSet] = await db
-    .select({ id: schema.problemset.id })
-    .from(schema.problemset)
-    .where(
-      and(
-        eq(schema.problemset.id, id),
-        eq(schema.problemset.visible, true),
-        ne(schema.problemset.status, "draft"),
-      ),
-    )
-    .limit(1)
-  // 所有老师都能看，不只是题单的创建者：系统里没有「班级归哪个老师」，课堂看板、数据统计
-  // 也是任何老师看任何班，这里和它们一致。后台那条（admin/problemset.ts 的 loadOwned）
-  // 能改能删，仍然只给创建者
-  if (!problemSet) {
-    return failure(c, 404, "problem-set-not-found", "题单不存在")
-  }
-  const limit = queryInteger(c.req.query("limit"), 10, { min: 1, max: 250 })
-  const offset = queryInteger(c.req.query("offset"), 0, { min: 0 })
-  const className = c.req.query("className")?.trim()
-  const completion = c.req.query("completionStatus")?.trim()
-  const filters = [eq(schema.problemsetProgress.problemsetId, id)]
-  // 只填数字（251）当班级号补上 ks；班级按 classPrefixCondition 匹配，
-  // 否则 251 会把 2511 班也算进来。别的输入照旧按用户名包含
-  if (className) {
-    const classPrefix = /^\d+$/.test(className) ? `ks${className}` : className
-    filters.push(classPrefixCondition(classPrefix) ?? ilike(schema.user.username, `%${className}%`))
-  }
-  if (completion === "completed") filters.push(eq(schema.problemsetProgress.isCompleted, true))
-  else if (completion === "in_progress")
-    filters.push(
-      and(
-        eq(schema.problemsetProgress.isCompleted, false),
-        gt(schema.problemsetProgress.completedProblemsCount, 0),
-      )!,
-    )
-  else if (completion === "not_started")
-    filters.push(eq(schema.problemsetProgress.completedProblemsCount, 0))
-  const where = and(...filters)
-  const [statsRows, rows, problemRows] = await Promise.all([
+/**
+ * 老师看一个班在这份题单里的情况：真名 × 每道题（几点做对 / 错几次 / 加入前就做对过）。
+ *
+ * 所有老师都能看，不只是题单的创建者：系统里没有「班级归哪个老师」，课堂看板、数据统计
+ * 也是任何老师看任何班，这里和它们一致。
+ *
+ * 班级不用老师选：从加入过的学生里数出有哪些班，最近有人加入的排第一个、默认就看它，
+ * 想看别的班再换（和比赛「全班情况」按参赛者推断班级是一个思路）。名单是那个班的全部学生，
+ * 没加入的也列出来，好点名。
+ */
+problemsetRoutes.get("/problem-sets/:id/class-view", requireTeacher, async (c) => {
+  const found = await loadVisible(queryInteger(c.req.param("id"), 0, { min: 1 }), c.get("user"))
+  if (!found) return failure(c, 404, "problem-set-not-found", "题单不存在")
+  const id = found.set.id
+  const studentRole = inArray(schema.user.adminType, [...STUDENT_ROLES])
+  const [links, joinedClasses] = await Promise.all([
    db
      .select({
-        total: count(),
-        completed: sql<number>`count(*) filter (where ${schema.problemsetProgress.isCompleted})::int`,
-        avgProgress: avg(schema.problemsetProgress.progressPercentage),
-      })
-      .from(schema.problemsetProgress)
-      .innerJoin(schema.user, eq(schema.problemsetProgress.userId, schema.user.id))
-      .where(where),
-    db
-      .select({
-        progress: schema.problemsetProgress,
-        user: schema.user,
-        realName: schema.userProfile.realName,
-      })
-      .from(schema.problemsetProgress)
-      .innerJoin(schema.user, eq(schema.problemsetProgress.userId, schema.user.id))
-      .leftJoin(schema.userProfile, eq(schema.userProfile.userId, schema.user.id))
-      .where(where)
-      .orderBy(
-        desc(schema.problemsetProgress.isCompleted),
-        desc(schema.problemsetProgress.progressPercentage),
-        asc(schema.problemsetProgress.joinTime),
-      )
-      .limit(limit)
-      .offset(offset),
-    db
-      .select({
-        id: schema.problem.id,
+        problemId: schema.problem.id,
        _id: schema.problem.displayId,
        title: schema.problem.title,
+        isRequired: schema.problemsetProblem.isRequired,
      })
      .from(schema.problemsetProblem)
      .innerJoin(schema.problem, eq(schema.problemsetProblem.problemId, schema.problem.id))
      .where(eq(schema.problemsetProblem.problemsetId, id))
      .orderBy(asc(schema.problemsetProblem.order), asc(schema.problemsetProblem.id)),
-  ])
-  const problemMap = new Map(problemRows.map((problem) => [String(problem.id), problem]))
-  const results = rows.map(
-    ({ progress, user: progressUser, realName }) =>
-      ({
-        id: progress.id,
-        problemSetId: progress.problemsetId,
-        user: sampleUser(progressUser, realName),
-        joinTime: progress.joinTime,
-        completeTime: progress.completeTime,
-        isCompleted: progress.isCompleted,
-        progressPercentage: progress.progressPercentage,
-        completedProblemsCount: progress.completedProblemsCount,
-        totalProblemsCount: progress.totalProblemsCount,
-        totalScore: progress.totalScore,
-        completedProblems: Object.keys(asRecord(progress.progressDetail)).flatMap(
-          (key) => problemMap.get(key) ?? [],
+    db
+      .select({
+        className: sql<string>`${schema.user.className}`,
+        joined: count(),
+        last: sql<string>`max(${schema.problemsetProgress.joinTime})`,
+      })
+      .from(schema.problemsetProgress)
+      .innerJoin(schema.user, eq(schema.user.id, schema.problemsetProgress.userId))
+      .where(
+        and(
+          eq(schema.problemsetProgress.problemsetId, id),
+          studentRole,
+          sql`coalesce(${schema.user.className}, '') <> ''`,
        ),
-      }) satisfies ProblemSetProgress,
-  )
-  const stats = statsRows[0]
+      )
+      .groupBy(schema.user.className)
+      .orderBy(sql`max(${schema.problemsetProgress.joinTime}) desc`),
+  ])
+  const sizes = joinedClasses.length
+    ? await db
+        .select({ className: sql<string>`${schema.user.className}`, value: count() })
+        .from(schema.user)
+        .where(
+          and(
+            inArray(
+              schema.user.className,
+              joinedClasses.map((row) => row.className),
+            ),
+            studentRole,
+            eq(schema.user.isDisabled, false),
+          ),
+        )
+        .groupBy(schema.user.className)
+    : []
+  const sizeOf = new Map(sizes.map((row) => [row.className, row.value]))
+  // 只有零星几个人加入的班（别的班的学生自己点进来的）排到后面去：至少 5 个、三分之一的人加入了
+  // 才算「这个班在做」，这样的班按最近一次有人加入排，默认看第一个
+  const classes = joinedClasses
+    .map((row) => ({
+      className: row.className,
+      joined: row.joined,
+      size: sizeOf.get(row.className) ?? row.joined,
+    }))
+    .map((row, recency) => ({ row, recency, doing: row.joined >= 5 && row.joined * 3 >= row.size }))
+    .sort((a, b) =>
+      a.doing !== b.doing
+        ? Number(b.doing) - Number(a.doing)
+        : a.doing
+          ? a.recency - b.recency
+          : b.row.joined - a.row.joined,
+    )
+    .map((item) => item.row)
+  const wanted = c.req.query("className")?.trim()
+  const className = wanted || classes[0]?.className || null
+  const graded = gradedIds(links)
+  const empty: ProblemSetClassView = {
+    classes,
+    className,
+    problems: links.map((link) => ({
+      id: link.problemId,
+      _id: link._id,
+      title: link.title,
+      isRequired: link.isRequired,
+      solved: 0,
+    })),
+    totalCount: graded.size,
+    students: [],
+  }
+  if (!className || links.length === 0) return success(c, empty)
+
+  const roster = await db
+    .select({
+      userId: schema.user.id,
+      username: schema.user.username,
+      realName: schema.userProfile.realName,
+      progress: schema.problemsetProgress,
+    })
+    .from(schema.user)
+    .leftJoin(schema.userProfile, eq(schema.userProfile.userId, schema.user.id))
+    .leftJoin(
+      schema.problemsetProgress,
+      and(
+        eq(schema.problemsetProgress.userId, schema.user.id),
+        eq(schema.problemsetProgress.problemsetId, id),
+      ),
+    )
+    .where(
+      and(eq(schema.user.className, className), studentRole, eq(schema.user.isDisabled, false)),
+    )
+    .orderBy(asc(schema.user.username))
+  if (roster.length === 0) return success(c, empty)
+  const userIds = roster.map((row) => row.userId)
+  const problemIds = links.map((link) => link.problemId)
+  const [wrongRows, beforeRows] = await Promise.all([
+    db
+      .select({
+        userId: schema.submission.userId,
+        problemId: schema.submission.problemId,
+        value: count(),
+      })
+      .from(schema.submission)
+      .where(
+        and(
+          eq(schema.submission.problemsetId, id),
+          inArray(schema.submission.userId, userIds),
+          notInArray(schema.submission.result, NON_FAILURE_RESULTS),
+        ),
+      )
+      .groupBy(schema.submission.userId, schema.submission.problemId),
+    // 加入之前就做对过（哪个入口都算）：老师据此知道谁可能是凭记忆默写的
+    db
+      .select({ userId: schema.submission.userId, problemId: schema.submission.problemId })
+      .from(schema.submission)
+      .innerJoin(
+        schema.problemsetProgress,
+        and(
+          eq(schema.problemsetProgress.userId, schema.submission.userId),
+          eq(schema.problemsetProgress.problemsetId, id),
+        ),
+      )
+      .where(
+        and(
+          inArray(schema.submission.userId, userIds),
+          inArray(schema.submission.problemId, problemIds),
+          inArray(schema.submission.result, SOLVED_RESULTS),
+          sql`${schema.submission.createTime} < ${schema.problemsetProgress.joinTime}`,
+        ),
+      )
+      .groupBy(schema.submission.userId, schema.submission.problemId),
+  ])
+  const key = (userId: number, problemId: number) => `${userId}:${problemId}`
+  const wrong = new Map(wrongRows.map((row) => [key(row.userId, row.problemId), row.value]))
+  const before = new Set(beforeRows.map((row) => key(row.userId, row.problemId)))
+  const solvedCount = new Map<number, number>()
+  const students = roster.map((row) => {
+    const detail = asRecord(row.progress?.progressDetail)
+    let completed = 0
+    const cells = links.map((link) => {
+      const entry = detail[String(link.problemId)]
+      const time = entry === undefined ? null : asRecord(entry).submit_time
+      if (entry !== undefined) {
+        solvedCount.set(link.problemId, (solvedCount.get(link.problemId) ?? 0) + 1)
+        if (graded.has(link.problemId)) completed += 1
+      }
+      return {
+        solvedTime: typeof time === "string" ? time : null,
+        wrongCount: wrong.get(key(row.userId, link.problemId)) ?? 0,
+        solvedBefore: before.has(key(row.userId, link.problemId)),
+      }
+    })
+    return {
+      userId: row.userId,
+      username: row.username,
+      realName: row.realName,
+      joinTime: row.progress?.joinTime ?? null,
+      completedCount: completed,
+      cells,
+    }
+  })
  return success(c, {
-    results,
-    total: stats?.total ?? 0,
-    statistics: {
-      total: stats?.total ?? 0,
-      completed: stats?.completed ?? 0,
-      avgProgress: Number(stats?.avgProgress ?? 0),
-    },
-    problems: problemRows,
-  } satisfies ProblemSetProgressList)
+    ...empty,
+    problems: empty.problems.map((problem) => ({
+      ...problem,
+      solved: solvedCount.get(problem.id) ?? 0,
+    })),
+    students,
+  } satisfies ProblemSetClassView)
 })
@@ -30,7 +30,7 @@ import {
 } from "../services/contest"
 import { CodeFormatError, formatCode } from "../services/format-code"
 import { getBooleanOption } from "../services/options"
-import { problemSetJoinTimes } from "../services/problemset"
+import { problemSetLockCutoffs } from "../services/problemset"
 import { consumeToken } from "../services/throttling"
 import { dayStart } from "../time"
 import { asFilterValue, asRecord, isAdminRole, isTeacherOrAbove, queryInteger } from "./helpers"
@@ -289,14 +289,14 @@ function canViewSubmission(
  user: AuthUser | null,
  row: { userId: number; problemId: number; createTime: string },
  problem: { createdById: number },
-  problemSetJoinTime?: Map<number, string>,
+  problemSetCutoffs?: Map<number, string>,
 ) {
  if (!user) return false
-  // 题单防作弊，见 problemSetJoinTimes。只对学生自己的提交生效，老师不受限。
+  // 题单防作弊，见 problemSetLockCutoffs。只对学生自己的提交生效，老师不受限。
  // 学生管理员算学生，同样受限（旧后端 `is_regular_user()` 放过了他）。
  if (row.userId === user.id && !isTeacherOrAbove(user)) {
-    const joinTime = problemSetJoinTime?.get(row.problemId)
-    if (joinTime !== undefined && Date.parse(row.createTime) < Date.parse(joinTime)) return false
+    const cutoff = problemSetCutoffs?.get(row.problemId)
+    if (cutoff !== undefined && Date.parse(row.createTime) < Date.parse(cutoff)) return false
  }
  // 看别人代码的角色捷径只给老师和超管。学生管理员算学生（STUDENT_ROLES）：他参赛、上榜、
  // 和同学做同一份作业，能读别人的提交就是开卷。旧后端这里是 `not user.is_regular_user()`，
@@ -399,11 +399,11 @@ async function submissionDetail(id: string, user: AuthUser) {
  if (!row) return null
  // 详情也要过闸门。旧后端只挡了列表里的链接，`SubmissionAPI.get`（views/oj.py:103）
  // 光走 check_user_permission——知道 submission id 直接访问照样拿得到代码，遮挡是虚的。
-  const joinTimes =
+  const cutoffs =
    isTeacherOrAbove(user) || row.submission.userId !== user.id
      ? undefined
-      : await problemSetJoinTimes(user.id, [row.submission.problemId])
-  if (!canViewSubmission(user, row.submission, row.problem, joinTimes)) return null
+      : await problemSetLockCutoffs(user.id, [row.submission.problemId])
+  if (!canViewSubmission(user, row.submission, row.problem, cutoffs)) return null
  // info（含每个测试点的 test_case 编号与 output_md5）只给管理员，对齐旧后端：
  // submission/views/oj.py 用 is_admin_role() 在 SubmissionModelSerializer 与
  // SubmissionSafeModelSerializer 之间二选一，把关的是角色，不是「是不是自己的提交」。
@@ -569,9 +569,9 @@ submissionRoutes.get("/submissions", optionalAuth, async (c) => {
    displayId ? unknownDisplayIds(displayId, null) : [],
  ])
  // 闸门只对学生自己的提交生效，所以只拿这一页里属于他自己的题目去查，一页一次查询
-  const [joinTimes, problemsetTitles] = await Promise.all([
+  const [cutoffs, problemsetTitles] = await Promise.all([
    user && !isTeacherOrAbove(user)
-      ? problemSetJoinTimes(user.id, [
+      ? problemSetLockCutoffs(user.id, [
          ...new Set(
            rows
              .filter((row) => row.submission.userId === user.id)
@@ -589,7 +589,7 @@ submissionRoutes.get("/submissions", optionalAuth, async (c) => {
          id: submission.id,
          problemDisplayId: problem.displayId,
          problemTitle: problem.title,
-          showLink: user ? canViewSubmission(user, submission, problem, joinTimes) : false,
+          showLink: user ? canViewSubmission(user, submission, problem, cutoffs) : false,
          createTime: submission.createTime,
          userId: submission.userId,
          username: submission.username,
@@ -1,4 +1,4 @@
-import { and, eq, gt, inArray, isNull, notInArray, or, sql } from "drizzle-orm"
+import { and, asc, eq, inArray, notInArray, sql } from "drizzle-orm"

 import { db, schema } from "../db"
 import { publishAchievementNotification } from "../events"
@@ -10,7 +10,7 @@ type ProgressRow = typeof schema.problemsetProgress.$inferSelect
 type ProblemLink = { problemId: number; score: number; isRequired: boolean }
 type BadgeCheck = Pick<
  ProgressRow,
-  "completedProblemsCount" | "totalProblemsCount" | "totalScore" | "progressDetail"
+  "completedProblemsCount" | "totalProblemsCount" | "progressDetail"
 >

 /**
@@ -132,7 +132,7 @@ export function eligibleForBadge(badge: BadgeRow, progress: BadgeCheck) {
  if (badge.conditionType === "problem_count") {
    return Object.keys(asRecord(progress.progressDetail)).length >= badge.conditionValue
  }
-  if (badge.conditionType === "score") return progress.totalScore >= badge.conditionValue
+  // 「总分达到 N」随分数一起拿掉了，0026 把它们换成了「做对 N 道」
  return false
 }

@@ -242,8 +242,8 @@ export async function recordSolvedProblem(
  problemId: number,
  /**
   * 做出来的那次代码提交。流程图画到 A/S 算完成时传 null：problemset_submission.submission_id
-   * 外键指向代码提交表，流程图提交的 id 进不去。不影响「解锁加入题单之前的提交」——
-   * 那道闸看的是 progress_detail（本文件下面的 problemSetJoinTimes）
+   * 外键指向代码提交表，流程图提交的 id 进不去。不影响防抄闸门的解锁 ——
+   * 那道闸看的是 progress_detail（本文件下面的 problemSetLockCutoffs）
   */
  submissionId: string | null,
  solvedAt: string,
@@ -390,50 +390,85 @@ export async function recordSolvedAndNotify(
  }
 }

+/** 题单现在是不是在布置期内。按数据库的钟算（`now()`），和防抄闸门同一个口径 */
+export const assigningSql = sql<boolean>`(${schema.problemset.assignedAt} is not null and ${schema.problemset.assignedUntil} > now())`
+
 /**
- * 题单防作弊闸门：查出这些题目里，哪些题的旧提交要对该用户藏起来，返回 problemId → 加入时间。
- * 代码提交（routes/submission.ts）和流程图提交（routes/flowchart.ts）共用这一道闸。
+ * 题单防抄闸门：查出这些题目里，哪些题的旧提交要对该用户藏起来，返回 problemId → 分界时刻
+ * （早于它的提交藏起来）。代码提交（routes/submission.ts）和流程图提交（routes/flowchart.ts）
+ * 共用这一道闸。
 *
- * 对齐旧后端 `submission/serializers.py:12` 的 `bulk_fetch_problemset_progress`。学生加入含
- * 某道题的题单后，他在加入之前留下的 AC 代码还摆在提交列表里，复制粘贴就能把题单刷完。
- * 备份快照里 1734 人次、188 名学生进过这个窗口（占已解题次的 22.5%），不是边角情况。
+ * 规则（2026-10 题单重设计，用户拍板）：题单**布置期内**，题单里这几道题，学生在**布置开始之前**
+ * 交的代码一律先藏起来 —— 不管他加没加入。老师常拿刚讲过的题攒复习题单：快照里 16% 的
+ * 「学生 × 题」加入前就做对过，不藏的话把自己以前的答案贴进去就完了。
 *
- * 解锁的三条路全写在 where 里，任一成立就查不出来、也就不遮挡：
- *   - 已经在题单里做出这道题（progress_detail 里有这道题的 key）
- *   - 题单过了截止时间（end_time；为空表示不设期限，只能靠做出来解锁）
- *   - 题单被归档（status 不是 active）
+ * 以前是「加入之后藏加入之前的」，于是先去提交记录里把旧答案复制下来、再点加入，闸就白设了；
+ * 现在分界是布置开始，没加入的人也藏，这个口子就没了。代价是别的班以前做过这几道题的人，
+ * 在这一两周里也看不到自己的旧代码，用户认了。
 *
- * 一道题可能同时落在多个已加入的题单里，取最晚的 join_time——「存在任一题单要求遮挡就遮挡」
- * 等价于「提交时间早于最晚的那次加入」。旧后端这里用 `.first()` 取任意一条，一题多题单时
- * 行为不确定，换成聚合顺手定死。
+ * 解锁的路全写在 where 里，任一成立就查不出来、也就不遮挡：
+ *   - 题单不在布置期（没布置，或者布置期过了）
+ *   - 题单没公开
+ *   - 已经在这份题单里做对了这道题（progress_detail 里有这道题的 key）
+ *
+ * 一道题可能同时落在几个正在布置的题单里，取最晚的布置开始 ——「任一题单要求遮挡就遮挡」。
 */
-export async function problemSetJoinTimes(userId: number, problemIds: number[]) {
-  const joinTimes = new Map<number, string>()
-  if (problemIds.length === 0) return joinTimes
+export async function problemSetLockCutoffs(userId: number, problemIds: number[]) {
+  const cutoffs = new Map<number, string>()
+  if (problemIds.length === 0) return cutoffs
  const rows = await db
    .select({
      problemId: schema.problemsetProblem.problemId,
      // 聚合表达式不走列的类型映射，但 OID 还是 1184 —— db/index.ts 给这个 OID 挂了
-      // 「转成 ISO 8601」的 parser，所以这里拿到的和 `mode:"string"` 的列同形状。
-      // 原来那个 `::text` 要撤掉：它的 OID 是 25、绕过那个 parser，反而会变成 PG 文本。
-      joinTime: sql<string>`max(${schema.problemsetProgress.joinTime})`,
+      // 「转成 ISO 8601」的 parser，所以这里拿到的和 `mode:"string"` 的列同形状
+      cutoff: sql<string>`max(${schema.problemset.assignedAt})`,
    })
-    .from(schema.problemsetProgress)
-    .innerJoin(schema.problemset, eq(schema.problemset.id, schema.problemsetProgress.problemsetId))
-    .innerJoin(
-      schema.problemsetProblem,
-      eq(schema.problemsetProblem.problemsetId, schema.problemset.id),
+    .from(schema.problemsetProblem)
+    .innerJoin(schema.problemset, eq(schema.problemset.id, schema.problemsetProblem.problemsetId))
+    .leftJoin(
+      schema.problemsetProgress,
+      and(
+        eq(schema.problemsetProgress.problemsetId, schema.problemset.id),
+        eq(schema.problemsetProgress.userId, userId),
+      ),
    )
    .where(
      and(
-        eq(schema.problemsetProgress.userId, userId),
        inArray(schema.problemsetProblem.problemId, problemIds),
-        eq(schema.problemset.status, "active"),
-        or(isNull(schema.problemset.endTime), gt(schema.problemset.endTime, sql`now()`)),
-        sql`not jsonb_exists(${schema.problemsetProgress.progressDetail}, ${schema.problemsetProblem.problemId}::text)`,
+        eq(schema.problemset.visible, true),
+        assigningSql,
+        sql`not coalesce(jsonb_exists(${schema.problemsetProgress.progressDetail}, ${schema.problemsetProblem.problemId}::text), false)`,
      ),
    )
    .groupBy(schema.problemsetProblem.problemId)
-  for (const row of rows) joinTimes.set(row.problemId, row.joinTime)
-  return joinTimes
+  for (const row of rows) cutoffs.set(row.problemId, row.cutoff)
+  return cutoffs
+}
+
+/** 这道题的旧代码为什么藏着：它落在哪些正在布置、我还没在里面做对的题单里 */
+export async function problemSetLocksFor(userId: number, problemId: number) {
+  return db
+    .select({
+      problemSetId: schema.problemset.id,
+      title: schema.problemset.title,
+      assignedUntil: sql<string>`${schema.problemset.assignedUntil}`,
+    })
+    .from(schema.problemsetProblem)
+    .innerJoin(schema.problemset, eq(schema.problemset.id, schema.problemsetProblem.problemsetId))
+    .leftJoin(
+      schema.problemsetProgress,
+      and(
+        eq(schema.problemsetProgress.problemsetId, schema.problemset.id),
+        eq(schema.problemsetProgress.userId, userId),
+      ),
+    )
+    .where(
+      and(
+        eq(schema.problemsetProblem.problemId, problemId),
+        eq(schema.problemset.visible, true),
+        assigningSql,
+        sql`not coalesce(jsonb_exists(${schema.problemsetProgress.progressDetail}, ${schema.problemsetProblem.problemId}::text), false)`,
+      ),
+    )
+    .orderBy(asc(schema.problemset.assignedUntil))
 }
@@ -2,7 +2,6 @@ import api from "utils/api"
 import { toAdminProblemRow } from "admin/transforms"
 import type {
  AcTrend,
-  AdminProblemSetProgress,
  BatchProblemTagResponse,
  GenerateSqlTestCaseResponse,
  RenameTagResponse,
@@ -40,6 +39,7 @@ import type {
  AdminProblemSetList,
  AdminProblemSet,
  AdminProblemSetProblem,
+  AddProblemsToSetResult,
  TutorialListItem,
  TagCategory,
 } from "utils/types"
@@ -495,15 +495,9 @@ export function updateACMHelperChecked(
 }

 // 题单管理 API
-export function getProblemSetList(
-  offset = 0,
-  limit = 10,
-  keyword = "",
-  difficulty = "",
-  status = "",
-) {
+export function getProblemSetList(offset = 0, limit = 10, keyword = "") {
  return api.get<AdminProblemSetList>("admin/problem-sets", {
-    params: { offset, limit, keyword, difficulty, status },
+    params: { offset, limit, keyword },
  })
 }

@@ -511,33 +505,20 @@ export function getProblemSetDetail(id: number) {
  return api.get<AdminProblemSet>(`admin/problem-sets/${id}`)
 }

-interface ProblemSetBody {
-  title?: string
-  description?: string
-  difficulty?: AdminProblemSet["difficulty"]
-  status?: AdminProblemSet["status"]
-  // 表单里是 Date，出站要 ISO 串
-  endTime?: Date | null
-  visible?: boolean
-}
-
-function toProblemSetBody(data: ProblemSetBody) {
-  return {
-    title: data.title,
-    description: data.description ?? "",
-    difficulty: data.difficulty ?? "Easy",
-    status: data.status ?? "active",
-    endTime: data.endTime ? new Date(data.endTime).toISOString() : null,
-    visible: data.visible ?? true,
-  }
+export interface ProblemSetBody {
+  title: string
+  description: string
+  /** 布置到哪天（东八区当天结束的 ISO 时刻）；null = 不布置 */
+  assignedUntil: string | null
+  visible: boolean
 }

 export function createProblemSet(data: ProblemSetBody) {
-  return api.post<AdminProblemSet>("admin/problem-sets", toProblemSetBody(data))
+  return api.post<AdminProblemSet>("admin/problem-sets", data)
 }

-export function editProblemSet(data: ProblemSetBody & { id: number }) {
-  return api.put<AdminProblemSet>(`admin/problem-sets/${data.id}`, toProblemSetBody(data))
+export function editProblemSet(id: number, data: ProblemSetBody) {
+  return api.put<AdminProblemSet>(`admin/problem-sets/${id}`, data)
 }

 export function deleteProblemSet(id: number) {
@@ -548,49 +529,28 @@ export function toggleProblemSetVisible(id: number) {
  return api.put<AdminProblemSet>(`admin/problem-sets/${id}/visibility`)
 }

-export function updateProblemSetStatus(id: number, status: string) {
-  return api.put<AdminProblemSet>(`admin/problem-sets/${id}/status`, { status })
-}
-
 // 题单题目管理 API
 export function getProblemSetProblems(problemSetId: number) {
  return api.get<AdminProblemSetProblem[]>(`admin/problem-sets/${problemSetId}/problems`)
 }

-export function addProblemToSet(
-  problemSetId: number,
-  data: {
-    problemId: string
-    order?: number
-    isRequired?: boolean
-    score?: number
-    hint?: string
-  },
-) {
-  return api.post(`admin/problem-sets/${problemSetId}/problems`, {
-    problemId: data.problemId,
-    order: data.order ?? 0,
-    isRequired: data.isRequired ?? true,
-    score: data.score ?? 0,
-    hint: data.hint ?? "",
+/** 一次加好几道（题号），按给的顺序接在最后；找不到的、已经在里面的分开报回来 */
+export function addProblemsToSet(problemSetId: number, problemIds: string[]) {
+  return api.post<AddProblemsToSetResult>(`admin/problem-sets/${problemSetId}/problems`, {
+    problemIds,
  })
 }

-export function editProblemInSet(
-  problemSetId: number,
-  problemSetProblemId: number,
-  data: {
-    order?: number
-    isRequired?: boolean
-    score?: number
-    hint?: string
-  },
-) {
-  return api.put(`admin/problem-sets/${problemSetId}/problems/${problemSetProblemId}`, data)
+export function setProblemRequired(problemSetId: number, itemId: number, isRequired: boolean) {
+  return api.put(`admin/problem-sets/${problemSetId}/problems/${itemId}`, { isRequired })
 }

-export function removeProblemFromSet(problemSetId: number, problemSetProblemId: number) {
-  return api.delete(`admin/problem-sets/${problemSetId}/problems/${problemSetProblemId}`)
+export function reorderProblemSetProblems(problemSetId: number, ids: number[]) {
+  return api.put(`admin/problem-sets/${problemSetId}/problems/order`, { ids })
+}
+
+export function removeProblemFromSet(problemSetId: number, itemId: number) {
+  return api.delete(`admin/problem-sets/${problemSetId}/problems/${itemId}`)
 }

 // 题单奖章管理 API
@@ -598,52 +558,26 @@ export function getProblemSetBadges(problemSetId: number) {
  return api.get<AdminProblemSetBadge[]>(`admin/problem-sets/${problemSetId}/badges`)
 }

-interface BadgeBody {
-  name?: string
-  description?: string
-  icon?: string
-  conditionType?: AdminProblemSetBadge["conditionType"]
-  conditionValue?: number
-}
-
-function toBadgeBody(data: BadgeBody) {
-  return {
-    name: data.name,
-    description: data.description ?? "",
-    icon: data.icon ?? "",
-    conditionType: data.conditionType,
-    conditionValue: data.conditionValue ?? 0,
-  }
+export interface BadgeBody {
+  name: string
+  description: string
+  icon: string
+  conditionType: AdminProblemSetBadge["conditionType"]
+  conditionValue: number
 }

 export function createProblemSetBadge(problemSetId: number, data: BadgeBody) {
-  return api.post<AdminProblemSetBadge>(
-    `admin/problem-sets/${problemSetId}/badges`,
-    toBadgeBody(data),
-  )
+  return api.post<AdminProblemSetBadge>(`admin/problem-sets/${problemSetId}/badges`, data)
 }

 export function editProblemSetBadge(problemSetId: number, badgeId: number, data: BadgeBody) {
-  return api.put<AdminProblemSetBadge>(
-    `admin/problem-sets/${problemSetId}/badges/${badgeId}`,
-    toBadgeBody(data),
-  )
+  return api.put<AdminProblemSetBadge>(`admin/problem-sets/${problemSetId}/badges/${badgeId}`, data)
 }

 export function deleteProblemSetBadge(problemSetId: number, badgeId: number) {
  return api.delete(`admin/problem-sets/${problemSetId}/badges/${badgeId}`)
 }

-// 题单进度管理 API
-// 注意：返回的是裸数组，不是分页信封 —— 和 oj 侧的 /user-progress 不同
-export function getProblemSetProgress(problemSetId: number) {
-  return api.get<AdminProblemSetProgress[]>(`admin/problem-sets/${problemSetId}/progress`)
-}
-
-export function removeUserFromProblemSet(problemSetId: number, userId: number) {
-  return api.delete(`admin/problem-sets/${problemSetId}/progress/${userId}`)
-}
-
 // 学生卡点分析
 export function getStuckProblems() {
  return api.get<StuckProblem[]>("admin/problem-analytics/stuck")
@@ -1,91 +0,0 @@
-<script lang="ts" setup>
-import { errorMessage } from "utils/api"
-import { deleteProblemSet, updateProblemSetStatus } from "admin/api"
-
-interface Props {
-  problemSetId: number
-}
-const props = defineProps<Props>()
-const emit = defineEmits(["updated"])
-
-const router = useRouter()
-const message = useMessage()
-
-const showStatusModal = ref(false)
-const newStatus = ref<"active" | "archived" | "draft">("active")
-
-const statusOptions = [
-  { label: "活跃", value: "active" },
-  { label: "已归档", value: "archived" },
-  { label: "草稿", value: "draft" },
-]
-
-async function handleDeleteProblemSet() {
-  try {
-    await deleteProblemSet(props.problemSetId)
-    message.success("删除成功")
-    emit("updated")
-  } catch (err) {
-    message.error("删除失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-function goEdit() {
-  router.push({
-    name: "admin problemset edit",
-    params: { problemSetId: props.problemSetId },
-  })
-}
-
-function goDetail() {
-  router.push({
-    name: "admin problemset detail",
-    params: { problemSetId: props.problemSetId },
-  })
-}
-
-function openStatusModal() {
-  showStatusModal.value = true
-}
-
-async function handleUpdateStatus() {
-  try {
-    await updateProblemSetStatus(props.problemSetId, newStatus.value)
-    message.success("状态更新成功")
-    showStatusModal.value = false
-    emit("updated")
-  } catch (err) {
-    message.error("状态更新失败：" + errorMessage(err, "未知错误"))
-  }
-}
-</script>
-
-<template>
-  <n-flex>
-    <n-button size="small" secondary type="primary" @click="goEdit"> 编辑 </n-button>
-    <n-button size="small" secondary type="info" @click="goDetail"> 详情 </n-button>
-    <n-button size="small" secondary type="warning" @click="openStatusModal"> 状态 </n-button>
-    <n-popconfirm @positive-click="handleDeleteProblemSet">
-      <template #trigger>
-        <n-button secondary size="small" type="error">删除</n-button>
-      </template>
-      确定删除这个题单吗？删除后题单将不可见。
-    </n-popconfirm>
-  </n-flex>
-
-  <n-modal v-model:show="showStatusModal" preset="card" title="更新题单状态" style="width: 400px">
-    <n-space vertical>
-      <n-form>
-        <n-form-item label="状态" required>
-          <n-select v-model:value="newStatus" :options="statusOptions" placeholder="选择状态" />
-        </n-form-item>
-      </n-form>
-    </n-space>
-    <template #footer>
-      <n-flex justify="end">
-        <n-button @click="showStatusModal = false">取消</n-button>
-        <n-button type="primary" @click="handleUpdateStatus">确认</n-button>
-      </n-flex>
-    </template>
-  </n-modal>
-</template>
@@ -1,94 +0,0 @@
-<script setup lang="ts">
-import { h } from "vue"
-import type { AdminProblemSetBadge } from "utils/types"
-import { NButton, NImage } from "naive-ui"
-
-interface Props {
-  badges: AdminProblemSetBadge[]
-}
-
-interface Emits {
-  (e: "add-badge"): void
-  (e: "edit-badge", badge: AdminProblemSetBadge): void
-  (e: "delete-badge", badgeId: number): void
-}
-
-defineProps<Props>()
-defineEmits<Emits>()
-</script>
-
-<template>
-  <div>
-    <n-flex justify="space-between" align="center" style="margin-bottom: 16px">
-      <h3>奖章列表</h3>
-      <n-button type="primary" @click="$emit('add-badge')"> 添加奖章 </n-button>
-    </n-flex>
-    <n-data-table
-      :columns="[
-        {
-          title: '图标',
-          key: 'icon',
-          render: (row) =>
-            h(NImage, {
-              src: row.icon,
-              width: 40,
-              height: 40,
-              objectFit: 'cover',
-              previewDisabled: true,
-              style: 'border-radius: 4px; border: 1px solid #d9d9d9',
-            }),
-        },
-        { title: '名称', key: 'name' },
-        {
-          title: '条件类型',
-          key: 'condition_type',
-          render: (row) => {
-            const typeMap: Record<string, string> = {
-              all_problems: '完成所有题目',
-              problem_count: '完成指定数量题目',
-              score: '达到指定分数',
-            }
-            return typeMap[row.conditionType] || row.conditionType
-          },
-        },
-        {
-          title: '条件值',
-          key: 'condition_value',
-          render: (row) => {
-            return row.conditionType === 'all_problems' ? '-' : row.conditionValue
-          },
-        },
-        { title: '描述', key: 'description' },
-        {
-          title: '操作',
-          key: 'actions',
-          width: 160,
-          render: (row) =>
-            h('div', { style: 'display: flex; gap: 8px;' }, [
-              h(
-                NButton,
-                {
-                  size: 'small',
-                  type: 'primary',
-                  secondary: true,
-                  onClick: () => $emit('edit-badge', row),
-                },
-                { default: () => '编辑' },
-              ),
-              h(
-                NButton,
-                {
-                  size: 'small',
-                  type: 'error',
-                  secondary: true,
-                  onClick: () => $emit('delete-badge', row.id),
-                },
-                { default: () => '删除' },
-              ),
-            ]),
-        },
-      ]"
-      :data="badges"
-    />
-  </div>
-</template>
@@ -1,155 +1,168 @@
 <script setup lang="ts">
+import { useThemeVars } from "naive-ui"
+import type { BadgeBody } from "admin/api"
 import type { AdminProblemSetBadge } from "utils/types"

-// 添加和编辑共用一个弹窗：传了 badge 就是编辑，null 就是添加。
-// 原来是两份八成相同的组件，改一处表单项另一处总要漏
-interface Props {
-  show: boolean
-  badge: AdminProblemSetBadge | null
-}
+/**
+ * 加奖章 / 改奖章共用一个弹窗：传了 badge 就是改，null 就是加。
+ * 条件只有两种：全部做完、做对 N 道（「总分达到 N」随分数一起拿掉了）。
+ * 「做对 N 道」数的是做对的全部题（含选做），和后端 eligibleForBadge 同一个口径。
+ */
+const props = defineProps<{ badge: AdminProblemSetBadge | null; problemsCount: number }>()
+const show = defineModel<boolean>("show", { required: true })
+const emit = defineEmits<{ save: [data: BadgeBody] }>()
+const theme = useThemeVars()

-type BadgeFormData = {
-  name: string
-  description: string
-  icon: string
-  conditionType: "all_problems" | "problem_count" | "score"
-  conditionValue?: number
-}
+const ICONS = [1, 2, 3, 4, 5, 6].map((i) => `/badge-${i}.png`)

-interface Emits {
-  (e: "update:show", value: boolean): void
-  (e: "create", data: BadgeFormData): void
-  (e: "update", data: BadgeFormData): void
-}
+const form = reactive<BadgeBody>({
+  name: "",
+  description: "",
+  icon: ICONS[0]!,
+  conditionType: "problem_count",
+  conditionValue: 1,
+})

-const props = defineProps<Props>()
-const emit = defineEmits<Emits>()
+// 每次打开都按当前模式重新填表：改就填这枚奖章的值，加就清空
+watch(show, (open) => {
+  if (!open) return
+  Object.assign(form, {
+    name: props.badge?.name ?? "",
+    description: props.badge?.description ?? "",
+    icon: props.badge?.icon || ICONS[0]!,
+    conditionType: props.badge?.conditionType ?? "problem_count",
+    conditionValue: props.badge?.conditionValue || 1,
+  })
+})

-const badgeName = ref("")
-const badgeDescription = ref("")
-const badgeIcon = ref("")
-const badgeConditionType = ref<"all_problems" | "problem_count" | "score">("all_problems")
-const badgeConditionValue = ref(1)
+const valid = computed(
+  () =>
+    form.name.trim().length > 0 &&
+    (form.conditionType === "all_problems" || form.conditionValue >= 1),
+)

-// 预设奖章图标选项
-const BADGE_LEN = 6
-const badgeIconOptions = []
-for (let i = 1; i <= BADGE_LEN; i++) {
-  badgeIconOptions.push({
-    label: `奖章${i}`,
-    value: `/badge-${i}.png`,
-    icon: `/badge-${i}.png`,
+function save() {
+  if (!valid.value) return
+  emit("save", {
+    ...form,
+    name: form.name.trim(),
+    conditionValue: form.conditionType === "all_problems" ? 0 : form.conditionValue,
  })
 }
-
-const conditionTypeOptions = [
-  { label: "完成所有题目", value: "all_problems" },
-  { label: "完成指定数量题目", value: "problem_count" },
-  { label: "达到指定分数", value: "score" },
-]
-
-function handleConfirm() {
-  const data: BadgeFormData = {
-    name: badgeName.value,
-    description: badgeDescription.value,
-    icon: badgeIcon.value,
-    conditionType: badgeConditionType.value,
-    // 只有非"完成所有题目"时才带条件值
-    ...(badgeConditionType.value === "all_problems"
-      ? {}
-      : { conditionValue: badgeConditionValue.value }),
-  }
-  if (props.badge) emit("update", data)
-  else emit("create", data)
-}
-
-function handleCancel() {
-  emit("update:show", false)
-}
-
-// 每次打开都按当前模式重新填表：编辑就填这枚奖章的值，添加就清空。
-// 编辑取消后再打开同一枚，看到的是库里的值，而不是上次没保存的改动
-watch(
-  () => props.show,
-  (open) => {
-    if (!open) return
-    const badge = props.badge
-    badgeName.value = badge?.name ?? ""
-    badgeDescription.value = badge?.description ?? ""
-    badgeIcon.value = badge?.icon ?? ""
-    badgeConditionType.value = badge?.conditionType ?? "all_problems"
-    badgeConditionValue.value = badge?.conditionValue ?? 1
-  },
-  { immediate: true },
-)
 </script>

 <template>
  <n-modal
-    :show="show"
+    v-model:show="show"
    preset="card"
-    :title="badge ? '编辑奖章' : '添加奖章'"
-    style="width: 500px"
-    @update:show="emit('update:show', $event)"
+    :title="badge ? '改奖章' : '加奖章'"
+    style="width: 460px"
+    :mask-closable="false"
  >
-    <n-form>
-      <n-form-item label="奖章名称" required>
-        <n-input v-model:value="badgeName" placeholder="请输入奖章名称" />
-      </n-form-item>
-      <n-form-item label="描述">
-        <n-input v-model:value="badgeDescription" type="textarea" placeholder="奖章描述" required />
-      </n-form-item>
-      <n-form-item label="图标" required>
-        <n-flex align="center" gap="small">
-          <div
-            v-for="option in badgeIconOptions"
-            :key="option.value"
-            @click="badgeIcon = option.value"
-            :style="{
-              width: '60px',
-              height: '60px',
-              border: badgeIcon === option.value ? '2px solid #1890ff' : '1px solid #d9d9d9',
-              borderRadius: '4px',
-              cursor: 'pointer',
-              display: 'flex',
-              alignItems: 'center',
-              justifyContent: 'center',
-              backgroundColor: badgeIcon === option.value ? '#f0f8ff' : 'transparent',
-            }"
+    <div class="form">
+      <div class="field">
+        <span class="label">图标</span>
+        <div class="icons">
+          <button
+            v-for="icon in ICONS"
+            :key="icon"
+            class="icon"
+            :class="{ on: form.icon === icon }"
+            :aria-label="`选这个图标`"
+            @click="form.icon = icon"
          >
-            <n-image
-              :src="option.icon"
-              width="50"
-              height="50"
-              object-fit="cover"
-              preview-disabled
-              style="border-radius: 2px"
-            />
-          </div>
-        </n-flex>
-      </n-form-item>
-      <n-flex align="center">
-        <n-form-item label="获得条件">
-          <n-select
-            style="width: 200px"
-            v-model:value="badgeConditionType"
-            :options="conditionTypeOptions"
-          />
-        </n-form-item>
-        <n-form-item label="条件值" v-if="badgeConditionType !== 'all_problems'">
-          <n-input-number
-            style="width: 120px"
-            v-model:value="badgeConditionValue"
-            placeholder="条件值"
-          />
-        </n-form-item>
-      </n-flex>
-    </n-form>
+            <img :src="icon" alt="" />
+          </button>
+        </div>
+      </div>
+      <div class="field">
+        <span class="label">名字</span>
+        <n-input v-model:value="form.name" placeholder="比如 人上人" maxlength="100" />
+      </div>
+      <div class="field">
+        <span class="label">说明</span>
+        <n-input v-model:value="form.description" placeholder="选填，学生拿到时看得到" />
+      </div>
+      <div class="field">
+        <span class="label">条件</span>
+        <n-radio-group v-model:value="form.conditionType">
+          <n-radio-button value="problem_count">做对几道</n-radio-button>
+          <n-radio-button value="all_problems">全部做完</n-radio-button>
+        </n-radio-group>
+        <n-input-number
+          v-if="form.conditionType === 'problem_count'"
+          v-model:value="form.conditionValue"
+          :min="1"
+          :max="Math.max(1, problemsCount)"
+          style="width: 110px"
+        >
+          <template #suffix>道</template>
+        </n-input-number>
+      </div>
+      <span class="hint">
+        {{
+          form.conditionType === "all_problems"
+            ? "必做题全部做对就发。"
+            : "做对的题（选做也算）够这个数就发。"
+        }}改了条件会按大家现在的进度重新发、收。
+      </span>
+    </div>
    <template #footer>
      <n-flex justify="end">
-        <n-button @click="handleCancel">取消</n-button>
-        <n-button type="primary" @click="handleConfirm">确认</n-button>
+        <n-button @click="show = false">取消</n-button>
+        <n-button type="primary" :disabled="!valid" @click="save">保存</n-button>
      </n-flex>
    </template>
  </n-modal>
 </template>
+
+<style scoped>
+.form {
+  display: flex;
+  flex-direction: column;
+  gap: 14px;
+}
+
+.field {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.label {
+  width: 36px;
+  flex-shrink: 0;
+  font-size: 13px;
+  color: v-bind("theme.textColor2");
+}
+
+.icons {
+  display: flex;
+  gap: 6px;
+}
+
+.icon {
+  width: 40px;
+  height: 40px;
+  padding: 3px;
+  border-radius: 6px;
+  border: 2px solid transparent;
+  background: transparent;
+  cursor: pointer;
+}
+
+.icon.on {
+  border-color: v-bind("theme.primaryColor");
+}
+
+.icon img {
+  width: 30px;
+  height: 30px;
+}
+
+.hint {
+  font-size: 12px;
+  line-height: 1.6;
+  color: v-bind("theme.textColor3");
+}
+</style>
@@ -1,71 +0,0 @@
-<script setup lang="ts">
-import { h } from "vue"
-import { NDataTable, NButton, NFlex } from "naive-ui"
-import type { AdminProblemSetProblem } from "utils/types"
-
-interface Props {
-  problems: AdminProblemSetProblem[]
-}
-
-interface Emits {
-  (e: "add-problem"): void
-  (e: "edit-problem", problem: AdminProblemSetProblem): void
-  (e: "remove-problem", problemSetProblemId: number): void
-}
-
-defineProps<Props>()
-defineEmits<Emits>()
-</script>
-
-<template>
-  <div>
-    <n-flex justify="space-between" align="center" style="margin-bottom: 16px">
-      <h3>题目列表</h3>
-      <n-button type="primary" @click="$emit('add-problem')"> 添加题目 </n-button>
-    </n-flex>
-    <n-data-table
-      :columns="[
-        { title: '题目ID', key: 'problemDisplayId', width: 80 },
-        { title: '题目标题', key: 'title', minWidth: 200 },
-        { title: '顺序', key: 'order', width: 80 },
-        {
-          title: '必做',
-          key: 'isRequired',
-          width: 80,
-          render: (row) => (row.isRequired ? '是' : '否'),
-        },
-        { title: '分数', key: 'score', width: 80 },
-        { title: '提示', key: 'hint', minWidth: 200 },
-        {
-          title: '操作',
-          key: 'actions',
-          width: 160,
-          render: (row) =>
-            h('div', { style: 'display: flex; gap: 8px;' }, [
-              h(
-                NButton,
-                {
-                  size: 'small',
-                  type: 'primary',
-                  secondary: true,
-                  onClick: () => $emit('edit-problem', row),
-                },
-                { default: () => '编辑' },
-              ),
-              h(
-                NButton,
-                {
-                  size: 'small',
-                  type: 'error',
-                  secondary: true,
-                  onClick: () => $emit('remove-problem', row.id),
-                },
-                { default: () => '移除' },
-              ),
-            ]),
-        },
-      ]"
-      :data="problems"
-    />
-  </div>
-</template>
@@ -1,100 +0,0 @@
-<script setup lang="ts">
-import type { AdminProblemSetProblem } from "utils/types"
-
-// 添加和编辑共用一个弹窗：传了 problem 就是编辑，null 就是添加。
-// 两种模式只差第一栏 —— 添加时填题目 ID，编辑时题目已定、只显示标题
-interface Props {
-  show: boolean
-  problem: AdminProblemSetProblem | null
-}
-
-type ProblemFormData = {
-  order: number
-  isRequired: boolean
-  score: number
-  hint: string
-}
-
-interface Emits {
-  (e: "update:show", value: boolean): void
-  (e: "create", data: ProblemFormData & { problemId: string }): void
-  (e: "update", data: ProblemFormData): void
-}
-
-const props = defineProps<Props>()
-const emit = defineEmits<Emits>()
-
-const problemId = ref("")
-const problemOrder = ref(0)
-const problemRequired = ref(true)
-const problemScore = ref(0)
-const problemHint = ref("")
-
-function handleConfirm() {
-  const data: ProblemFormData = {
-    order: problemOrder.value,
-    isRequired: problemRequired.value,
-    score: problemScore.value,
-    hint: problemHint.value,
-  }
-  if (props.problem) emit("update", data)
-  else emit("create", { problemId: problemId.value, ...data })
-}
-
-function handleCancel() {
-  emit("update:show", false)
-}
-
-// 每次打开都按当前模式重新填表：编辑就填这道题的值，添加就清空。
-// 编辑取消后再打开同一道，看到的是库里的值，而不是上次没保存的改动
-watch(
-  () => props.show,
-  (open) => {
-    if (!open) return
-    const problem = props.problem
-    problemId.value = ""
-    problemOrder.value = problem?.order ?? 0
-    problemRequired.value = problem?.isRequired ?? true
-    problemScore.value = problem?.score ?? 0
-    problemHint.value = problem?.hint || ""
-  },
-  { immediate: true },
-)
-</script>
-
-<template>
-  <n-modal
-    :show="show"
-    preset="card"
-    :title="problem ? '编辑题目' : '添加题目'"
-    style="width: 500px"
-    @update:show="emit('update:show', $event)"
-  >
-    <n-form>
-      <n-form-item v-if="problem" label="题目标题">
-        <n-input :value="problem.title" disabled />
-      </n-form-item>
-      <n-form-item v-else label="题目ID" required>
-        <n-input v-model:value="problemId" placeholder="请输入题目的显示ID（如：1001）" />
-      </n-form-item>
-      <n-form-item label="顺序">
-        <n-input-number v-model:value="problemOrder" placeholder="题目在题单中的顺序" />
-      </n-form-item>
-      <n-form-item label="是否必做">
-        <n-switch v-model:value="problemRequired" />
-      </n-form-item>
-      <n-form-item label="分数">
-        <n-input-number v-model:value="problemScore" placeholder="题目分数" />
-      </n-form-item>
-      <n-form-item label="提示">
-        <n-input v-model:value="problemHint" type="textarea" placeholder="题目提示" />
-      </n-form-item>
-    </n-form>
-    <template #footer>
-      <n-flex justify="end">
-        <n-button @click="handleCancel">取消</n-button>
-        <n-button type="primary" @click="handleConfirm">确认</n-button>
-      </n-flex>
-    </template>
-  </n-modal>
-</template>
@@ -1,70 +0,0 @@
-<script setup lang="ts">
-import { parseTime } from "utils/functions"
-import type { AdminProblemSet } from "utils/types"
-
-interface Props {
-  problemSet: AdminProblemSet
-}
-
-defineProps<Props>()
-</script>
-
-<template>
-  <n-card title="题单信息" style="margin-bottom: 16px">
-    <n-descriptions :column="4" bordered>
-      <n-descriptions-item label="描述">
-        {{ problemSet.description }}
-      </n-descriptions-item>
-      <n-descriptions-item label="创建者">
-        {{ problemSet.createdBy.username }}
-      </n-descriptions-item>
-      <n-descriptions-item label="难度">
-        <n-tag
-          :type="
-            problemSet.difficulty === 'Easy'
-              ? 'success'
-              : problemSet.difficulty === 'Medium'
-                ? 'warning'
-                : 'error'
-          "
-        >
-          {{
-            problemSet.difficulty === "Easy"
-              ? "简单"
-              : problemSet.difficulty === "Medium"
-                ? "中等"
-                : "困难"
-          }}
-        </n-tag>
-      </n-descriptions-item>
-      <n-descriptions-item label="状态">
-        <n-tag
-          :type="
-            problemSet.status === 'active'
-              ? 'success'
-              : problemSet.status === 'archived'
-                ? 'default'
-                : 'info'
-          "
-        >
-          {{
-            problemSet.status === "active"
-              ? "活跃"
-              : problemSet.status === "archived"
-                ? "已归档"
-                : "草稿"
-          }}
-        </n-tag>
-      </n-descriptions-item>
-      <n-descriptions-item label="可见">
-        {{ problemSet.visible ? "是" : "否" }}
-      </n-descriptions-item>
-      <n-descriptions-item label="题目数量">
-        {{ problemSet.problemsCount }}
-      </n-descriptions-item>
-      <n-descriptions-item label="创建时间">
-        {{ parseTime(problemSet.createTime, "YYYY-MM-DD HH:mm:ss") }}
-      </n-descriptions-item>
-    </n-descriptions>
-  </n-card>
-</template>
@@ -1,67 +0,0 @@
-<script setup lang="ts">
-import { h } from "vue"
-import { NDataTable, NButton, NFlex } from "naive-ui"
-import { parseTime } from "utils/functions"
-import type { AdminProblemSetProgress } from "utils/types"
-
-interface Props {
-  progress: AdminProblemSetProgress[]
-}
-
-interface Emits {
-  (e: "remove-user", userId: number): void
-}
-
-defineProps<Props>()
-const emit = defineEmits<Emits>()
-
-// 定义表格列
-const progressColumns = [
-  { title: "用户", key: "username", width: 120 },
-  {
-    title: "加入时间",
-    key: "joinTime",
-    width: 180,
-    render: (row: AdminProblemSetProgress) => parseTime(row.joinTime, "YYYY-MM-DD HH:mm:ss"),
-  },
-  { title: "已完成", key: "completedProblemsCount", width: 100 },
-  { title: "总题目", key: "totalProblemsCount", width: 100 },
-  {
-    title: "进度",
-    key: "progressPercentage",
-    width: 100,
-    render: (row: AdminProblemSetProgress) => `${row.progressPercentage.toFixed(0)}%`,
-  },
-  {
-    title: "是否完成",
-    key: "isCompleted",
-    width: 100,
-    render: (row: AdminProblemSetProgress) => (row.isCompleted ? "是" : "否"),
-  },
-  {
-    title: "操作",
-    key: "actions",
-    width: 120,
-    render: (row: AdminProblemSetProgress) =>
-      h(
-        NButton,
-        {
-          size: "small",
-          type: "error",
-          secondary: true,
-          onClick: () => emit("remove-user", row.userId),
-        },
-        { default: () => "移除" },
-      ),
-  },
-]
-</script>
-
-<template>
-  <div>
-    <n-flex justify="space-between" align="center" style="margin-bottom: 16px">
-      <h3>用户进度</h3>
-    </n-flex>
-    <n-data-table :columns="progressColumns" :data="progress" />
-  </div>
-</template>
@@ -1,261 +0,0 @@
-<script setup lang="ts">
-import PageHeader from "admin/components/PageHeader.vue"
-import { errorMessage } from "utils/api"
-import { NTabPane, NTabs, NButton } from "naive-ui"
-import type {
-  AdminProblemSet,
-  AdminProblemSetProblem,
-  AddProblemToSetRequest,
-  UpdateProblemInSetRequest,
-  CreateProblemSetBadgeRequest,
-  AdminProblemSetBadge,
-  AdminProblemSetProgress,
-} from "utils/types"
-import {
-  getProblemSetDetail,
-  getProblemSetProblems,
-  getProblemSetBadges,
-  getProblemSetProgress,
-  addProblemToSet,
-  editProblemInSet,
-  removeProblemFromSet,
-  createProblemSetBadge,
-  editProblemSetBadge,
-  deleteProblemSetBadge,
-  removeUserFromProblemSet,
-} from "../api"
-import ProblemSetInfo from "./components/ProblemSetInfo.vue"
-import ProblemManagement from "./components/ProblemManagement.vue"
-import BadgeManagement from "./components/BadgeManagement.vue"
-import ProgressManagement from "./components/ProgressManagement.vue"
-import ProblemModal from "./components/ProblemModal.vue"
-import BadgeModal from "./components/BadgeModal.vue"
-
-const route = useRoute()
-const router = useRouter()
-const message = useMessage()
-
-/** 奖章弹窗的表单值：条件类型是「完成所有题目」时不带 conditionValue，后端补 0 */
-type BadgeFormData = Omit<CreateProblemSetBadgeRequest, "conditionValue"> & {
-  conditionValue?: number
-}
-
-const problemSetId = computed(() => Number(route.params.problemSetId))
-
-const problemSet = ref<AdminProblemSet | null>(null)
-const problems = ref<AdminProblemSetProblem[]>([])
-const badges = ref<AdminProblemSetBadge[]>([])
-const progress = ref<AdminProblemSetProgress[]>([])
-
-// 模态框状态。添加和编辑共用一个弹窗，editing* 为 null 就是添加
-const showProblemModal = ref(false)
-const showBadgeModal = ref(false)
-
-// 编辑数据
-const editingProblem = ref<AdminProblemSetProblem | null>(null)
-const editingBadge = ref<AdminProblemSetBadge | null>(null)
-
-async function loadProblemSetDetail() {
-  try {
-    const res = await getProblemSetDetail(problemSetId.value)
-    problemSet.value = res
-  } catch (err) {
-    message.error("加载题单详情失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function loadProblems() {
-  try {
-    const res = await getProblemSetProblems(problemSetId.value)
-    problems.value = res
-  } catch (err) {
-    message.error("加载题目列表失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function loadBadges() {
-  try {
-    const res = await getProblemSetBadges(problemSetId.value)
-    badges.value = res
-  } catch (err) {
-    message.error("加载奖章列表失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function loadProgress() {
-  try {
-    const res = await getProblemSetProgress(problemSetId.value)
-    progress.value = res
-  } catch (err) {
-    message.error("加载进度列表失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleAddProblem(data: AddProblemToSetRequest) {
-  try {
-    await addProblemToSet(problemSetId.value, data)
-    message.success("题目添加成功")
-    showProblemModal.value = false
-    loadProblems()
-    loadProblemSetDetail() // 刷新题目数量
-  } catch (err) {
-    message.error("添加题目失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleRemoveProblem(problemSetProblemId: number) {
-  try {
-    await removeProblemFromSet(problemSetId.value, problemSetProblemId)
-    message.success("题目移除成功")
-    loadProblems()
-    loadProblemSetDetail() // 刷新题目数量
-  } catch (err) {
-    message.error("移除题目失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleEditProblem(data: UpdateProblemInSetRequest) {
-  if (!editingProblem.value) return
-
-  try {
-    await editProblemInSet(problemSetId.value, editingProblem.value.id, data)
-    message.success("题目编辑成功")
-    showProblemModal.value = false
-    loadProblems()
-  } catch (err) {
-    message.error("编辑题目失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleAddBadge(data: BadgeFormData) {
-  try {
-    await createProblemSetBadge(problemSetId.value, data)
-    message.success("奖章创建成功")
-    showBadgeModal.value = false
-    loadBadges()
-  } catch (err) {
-    message.error("创建奖章失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleDeleteBadge(badgeId: number) {
-  try {
-    await deleteProblemSetBadge(problemSetId.value, badgeId)
-    message.success("奖章删除成功")
-    loadBadges()
-  } catch (err) {
-    message.error("删除奖章失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleEditBadge(data: BadgeFormData) {
-  if (!editingBadge.value) return
-
-  try {
-    await editProblemSetBadge(problemSetId.value, editingBadge.value.id, data)
-    message.success("奖章编辑成功")
-    showBadgeModal.value = false
-    loadBadges()
-  } catch (err) {
-    message.error("编辑奖章失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-async function handleRemoveUser(userId: number) {
-  try {
-    await removeUserFromProblemSet(problemSetId.value, userId)
-    message.success("用户移除成功")
-    loadProgress()
-  } catch (err) {
-    message.error("移除用户失败：" + errorMessage(err, "未知错误"))
-  }
-}
-
-function openAddProblemModal() {
-  editingProblem.value = null
-  showProblemModal.value = true
-}
-
-function openAddBadgeModal() {
-  editingBadge.value = null
-  showBadgeModal.value = true
-}
-
-function openEditProblemModal(problem: AdminProblemSetProblem) {
-  editingProblem.value = problem
-  showProblemModal.value = true
-}
-
-function openEditBadgeModal(badge: AdminProblemSetBadge) {
-  editingBadge.value = badge
-  showBadgeModal.value = true
-}
-
-onMounted(() => {
-  loadProblemSetDetail()
-  loadProblems()
-  loadBadges()
-  loadProgress()
-})
-</script>
-
-<template>
-  <div v-if="problemSet">
-    <PageHeader :title="problemSet.title" :back="{ name: 'admin problemset list' }">
-      <template #actions>
-        <n-button
-          type="primary"
-          @click="
-            router.push({
-              name: 'admin problemset edit',
-              params: { problemSetId },
-            })
-          "
-        >
-          编辑题单
-        </n-button>
-      </template>
-    </PageHeader>
-
-    <ProblemSetInfo :problem-set="problemSet" />
-
-    <n-tabs type="line">
-      <n-tab-pane name="problems" tab="题目管理">
-        <ProblemManagement
-          :problems="problems"
-          @add-problem="openAddProblemModal"
-          @edit-problem="openEditProblemModal"
-          @remove-problem="handleRemoveProblem"
-        />
-      </n-tab-pane>
-
-      <n-tab-pane name="badges" tab="奖章管理">
-        <BadgeManagement
-          :badges="badges"
-          @add-badge="openAddBadgeModal"
-          @edit-badge="openEditBadgeModal"
-          @delete-badge="handleDeleteBadge"
-        />
-      </n-tab-pane>
-
-      <n-tab-pane name="progress" tab="进度管理">
-        <ProgressManagement :progress="progress" @remove-user="handleRemoveUser" />
-      </n-tab-pane>
-    </n-tabs>
-
-    <!-- 模态框组件 -->
-    <ProblemModal
-      v-model:show="showProblemModal"
-      :problem="editingProblem"
-      @create="handleAddProblem"
-      @update="handleEditProblem"
-    />
-
-    <BadgeModal
-      v-model:show="showBadgeModal"
-      :badge="editingBadge"
-      @create="handleAddBadge"
-      @update="handleEditBadge"
-    />
-  </div>
-</template>
@@ -1,168 +1,820 @@
 <script setup lang="ts">
+import { useThemeVars } from "naive-ui"
 import PageHeader from "admin/components/PageHeader.vue"
 import { errorMessage } from "utils/api"
-import type { CreateProblemSetData, EditProblemSetData } from "utils/types"
-import { fromPickerValue, toPickerValue } from "utils/functions"
-import { getProblemSetDetail, createProblemSet, editProblemSet } from "../api"
+import { fromPickerValue, parseTime, toPickerValue, zonedParts } from "utils/functions"
+import type { AdminProblemRow, AdminProblemSet, AdminProblemSetBadge } from "utils/types"
+import {
+  addProblemsToSet,
+  createProblemSet,
+  createProblemSetBadge,
+  deleteProblemSet,
+  deleteProblemSetBadge,
+  editProblemSet,
+  editProblemSetBadge,
+  getLibraryProblemList,
+  getProblemSetBadges,
+  getProblemSetDetail,
+  getProblemSetProblems,
+  removeProblemFromSet,
+  reorderProblemSetProblems,
+  setProblemRequired,
+  type BadgeBody,
+} from "../api"
+import BadgeModal from "./components/BadgeModal.vue"
+
+/**
+ * 新建 / 编辑题单，一屏做完（设计稿「题单重设计」后台那块）：左边名字、说明、布置期、公开；
+ * 右边题目（搜题号或一次粘贴好几个、拖动排序、点一下切选做）和奖章。
+ *
+ * 布置期：选「布置到哪天」，布置期内这几道题学生以前交的代码先藏起来（防抄），不拦做题。
+ * 新建时题目先攒在页面上，保存时建好题单再一次加进去；编辑时加、删、排、切选做当场生效。
+ */
+const props = defineProps<{ problemSetId?: string }>()

-const route = useRoute()
 const router = useRouter()
 const message = useMessage()
+const dialog = useDialog()
+const theme = useThemeVars()

-const problemSetId = computed(() => Number(route.params.problemSetId))
-const isEdit = computed(() => !!problemSetId.value)
+const editing = computed(() => !!props.problemSetId)
+const id = computed(() => Number(props.problemSetId))
+const ready = ref(false)
+const saving = ref(false)
+const current = ref<AdminProblemSet | null>(null)

-const formData = ref<CreateProblemSetData & Partial<EditProblemSetData>>({
-  title: "",
-  description: "",
-  difficulty: "Easy",
-  status: "draft",
-  visible: false,
-  endTime: null,
+const form = reactive({ title: "", description: "", visible: true })
+
+// ---------------------------------------------------------------- 布置期
+
+const DAY = 86_400_000
+const OFFSET = 8 * 3_600_000
+const CHOICES = [
+  { days: 7, label: "一周" },
+  { days: 14, label: "两周" },
+  { days: 28, label: "四周" },
+]
+const WEEKDAYS = ["日", "一", "二", "三", "四", "五", "六"]
+
+/** 东八区某一天结束的时刻（23:59:59.999） */
+function endOfDay(ms: number) {
+  const parts = zonedParts(new Date(ms))!
+  return Date.UTC(parts.year, parts.month - 1, parts.day + 1) - OFFSET - 1
+}
+
+/** "none" 不布置 / 天数 / "pick" 自己选日期 */
+const choice = ref<"none" | "pick" | number>(14)
+const picked = ref(toPickerValue(Date.now() + 14 * DAY))
+
+const untilMs = computed(() => {
+  if (choice.value === "none") return null
+  if (choice.value === "pick") return endOfDay(fromPickerValue(picked.value))
+  return endOfDay(Date.now() + choice.value * DAY)
 })

-// n-date-picker 按浏览器本地渲染，所以要平移一次再绑定（见 utils/functions.ts
-// 的 toPickerValue）。`formData.endTime` 里始终存**真实时刻**，只有喂给选择器那一步换。
-const endTimeTimestamp = computed({
-  get: () => (formData.value.endTime ? toPickerValue(formData.value.endTime.getTime()) : null),
-  set: (val: number | null) => {
-    formData.value.endTime = val ? new Date(fromPickerValue(val)) : null
+function dayText(ms: number) {
+  const iso = new Date(ms).toISOString()
+  return `${parseTime(iso, "M月D日")} 周${WEEKDAYS[new Date(ms + OFFSET).getUTCDay()]}`
+}
+
+const running = computed(() => !!current.value?.assigning)
+const expired = computed(
+  () => !!current.value && !current.value.assigning && !!current.value.assignedUntil,
+)
+
+const assignHint = computed(() => {
+  if (untilMs.value === null) {
+    return running.value
+      ? "保存后马上结束布置，以前的代码都放出来。"
+      : "不布置：学生照样能加入、做题，只是不藏以前的代码。"
+  }
+  if (untilMs.value <= Date.now()) return "这一天已经过了，选个以后的日子。"
+  const head = `布置到 ${dayText(untilMs.value)}。`
+  return running.value
+    ? `${head}这一轮从 ${parseTime(current.value!.assignedAt!, "M月D日")} 开始，改日期只是延长或提前结束。`
+    : `${head}${expired.value ? "上一轮已经结束，保存就是再布置一次。" : ""}`
+})
+
+const disabledDate = (ts: number) => fromPickerValue(ts) + DAY <= Date.now()
+
+// ---------------------------------------------------------------- 题目
+
+type Item = { id: number; displayId: string; title: string; isRequired: boolean }
+const items = ref<Item[]>([])
+
+async function loadProblems() {
+  const rows = await getProblemSetProblems(id.value)
+  items.value = rows.map((row) => ({
+    id: row.id,
+    displayId: row.problemDisplayId,
+    title: row.title,
+    isRequired: row.isRequired,
+  }))
+}
+
+const keyword = ref("")
+const results = ref<AdminProblemRow[]>([])
+const searching = ref(false)
+
+/** 输入框里粘了好几个题号（空格、逗号、顿号隔开） */
+const pasted = computed(() => {
+  const parts = keyword.value
+    .split(/[\s,，、;；]+/)
+    .map((part) => part.trim())
+    .filter(Boolean)
+  return parts.length > 1 ? parts : []
+})
+
+watchDebounced(
+  keyword,
+  async (value) => {
+    if (!value.trim() || pasted.value.length) {
+      results.value = []
+      return
+    }
+    searching.value = true
+    try {
+      results.value = (await getLibraryProblemList(0, 8, value.trim())).results
+    } finally {
+      searching.value = false
+    }
  },
-})
+  { debounce: 300 },
+)

-const difficultyOptions = [
-  { label: "简单", value: "Easy" },
-  { label: "中等", value: "Medium" },
-  { label: "困难", value: "Hard" },
-]
+const added = (displayId: string) =>
+  items.value.some((item) => item.displayId.toLowerCase() === displayId.toLowerCase())

-const statusOptions = [
-  { label: "活跃", value: "active" },
-  { label: "已归档", value: "archived" },
-  { label: "草稿", value: "draft" },
-]
-
-const loading = ref(false)
-
-async function loadProblemSetDetail() {
-  if (!isEdit.value) return
-
-  try {
-    const res = await getProblemSetDetail(problemSetId.value)
-    const data = res
-    formData.value = {
-      id: data.id,
-      title: data.title,
-      description: data.description,
-      difficulty: data.difficulty,
-      status: data.status,
-      visible: data.visible,
-      endTime: data.endTime ? new Date(data.endTime) : null,
+async function addMany(displayIds: string[], titles = new Map<string, string>()) {
+  if (!editing.value) {
+    // 新建时先攒着；题目名要查一次，粘贴进来的题号只有号
+    for (const typed of displayIds) {
+      if (added(typed)) continue
+      let displayId = typed
+      let title = titles.get(typed)
+      if (!title) {
+        const found = (await getLibraryProblemList(0, 5, typed)).results.find(
+          (row) => row._id.toLowerCase() === typed.toLowerCase(),
+        )
+        if (!found) {
+          message.warning(`题号 ${typed} 找不到（或者没公开）`)
+          continue
+        }
+        title = found.title
+        displayId = found._id
+      }
+      items.value.push({ id: 0, displayId, title, isRequired: true })
    }
+    keyword.value = ""
+    return
+  }
+  try {
+    const res = await addProblemsToSet(id.value, displayIds)
+    const notes = []
+    if (res.missing.length) notes.push(`找不到：${res.missing.join("、")}`)
+    if (res.duplicate.length) notes.push(`已经在里面：${res.duplicate.join("、")}`)
+    if (notes.length) message.warning(notes.join("；"))
+    else message.success(`加了 ${res.added.length} 道`)
+    keyword.value = ""
+    await Promise.all([loadProblems(), reloadSet()])
  } catch (err) {
-    message.error("加载题单详情失败：" + errorMessage(err, "未知错误"))
+    message.error(errorMessage(err))
  }
 }

-async function handleSubmit() {
-  if (!formData.value.title?.trim()) {
-    message.error("请输入题单标题")
-    return
-  }
-
-  if (!formData.value.description?.trim()) {
-    message.error("请输入题单描述")
-    return
-  }
-
-  loading.value = true
+function addRow(row: AdminProblemRow) {
+  addMany([row._id], new Map([[row._id, row.title]]))
+}

+async function toggleRequired(item: Item) {
+  item.isRequired = !item.isRequired
+  if (!editing.value) return
  try {
-    if (isEdit.value) {
-      await editProblemSet(formData.value as EditProblemSetData)
-      message.success("题单更新成功")
-    } else {
-      await createProblemSet(formData.value as CreateProblemSetData)
-      message.success("题单创建成功")
-    }
-    router.push({ name: "admin problemset list" })
+    await setProblemRequired(id.value, item.id, item.isRequired)
  } catch (err) {
-    message.error((isEdit.value ? "更新" : "创建") + "题单失败：" + errorMessage(err, "未知错误"))
+    item.isRequired = !item.isRequired
+    message.error(errorMessage(err))
+  }
+}
+
+function remove(item: Item) {
+  if (!editing.value) {
+    items.value = items.value.filter((it) => it !== item)
+    return
+  }
+  dialog.warning({
+    title: "从题单里拿掉这道题？",
+    content: `「${item.title}」。已经加入的 ${current.value?.participantCount ?? 0} 个人的进度会重算，题目本身不受影响。`,
+    positiveText: "拿掉",
+    negativeText: "不拿",
+    onPositiveClick: async () => {
+      try {
+        await removeProblemFromSet(id.value, item.id)
+        await Promise.all([loadProblems(), reloadSet()])
+      } catch (err) {
+        message.error(errorMessage(err))
+      }
+    },
+  })
+}
+
+// 拖动排序：原生 drag & drop，和比赛出卷那页同一套
+const dragging = ref<number | null>(null)
+function onDragStart(index: number) {
+  dragging.value = index
+}
+function onDragEnter(index: number) {
+  const from = dragging.value
+  if (from === null || from === index) return
+  const list = [...items.value]
+  const [moved] = list.splice(from, 1)
+  list.splice(index, 0, moved!)
+  items.value = list
+  dragging.value = index
+}
+async function onDragEnd() {
+  if (dragging.value === null) return
+  dragging.value = null
+  if (!editing.value) return
+  try {
+    await reorderProblemSetProblems(
+      id.value,
+      items.value.map((item) => item.id),
+    )
+  } catch (err) {
+    message.error(errorMessage(err))
+    await loadProblems()
+  }
+}
+
+const optionalCount = computed(() => items.value.filter((item) => !item.isRequired).length)
+
+// ---------------------------------------------------------------- 奖章
+
+const badges = ref<AdminProblemSetBadge[]>([])
+const badgeModal = ref(false)
+const editingBadge = ref<AdminProblemSetBadge | null>(null)
+
+function badgeCondition(badge: AdminProblemSetBadge) {
+  return badge.conditionType === "all_problems" ? "全部做完" : `做对 ${badge.conditionValue} 道`
+}
+
+function openBadge(badge: AdminProblemSetBadge | null) {
+  editingBadge.value = badge
+  badgeModal.value = true
+}
+
+async function saveBadge(data: BadgeBody) {
+  try {
+    if (editingBadge.value) await editProblemSetBadge(id.value, editingBadge.value.id, data)
+    else await createProblemSetBadge(id.value, data)
+    badgeModal.value = false
+    badges.value = await getProblemSetBadges(id.value)
+  } catch (err) {
+    message.error(errorMessage(err))
+  }
+}
+
+function removeBadge(badge: AdminProblemSetBadge) {
+  dialog.warning({
+    title: `删掉奖章「${badge.name}」？`,
+    content: badge.earnedCount
+      ? `已经拿到它的 ${badge.earnedCount} 个人也会一起被收回。`
+      : "还没有人拿到它。",
+    positiveText: "删掉",
+    negativeText: "不删",
+    onPositiveClick: async () => {
+      try {
+        await deleteProblemSetBadge(id.value, badge.id)
+        badges.value = await getProblemSetBadges(id.value)
+      } catch (err) {
+        message.error(errorMessage(err))
+      }
+    },
+  })
+}
+
+// ---------------------------------------------------------------- 载入 / 保存
+
+async function reloadSet() {
+  current.value = await getProblemSetDetail(id.value)
+}
+
+async function load() {
+  keyword.value = ""
+  if (!editing.value) {
+    ready.value = true
+    return
+  }
+  await reloadSet()
+  const set = current.value!
+  Object.assign(form, { title: set.title, description: set.description, visible: set.visible })
+  if (set.assigning) {
+    choice.value = "pick"
+    picked.value = toPickerValue(Date.parse(set.assignedUntil!))
+  } else {
+    choice.value = "none"
+  }
+  await Promise.all([loadProblems(), getProblemSetBadges(id.value).then((b) => (badges.value = b))])
+  ready.value = true
+}
+
+async function submit() {
+  if (!form.title.trim()) {
+    message.error("题单还没起名字")
+    return
+  }
+  if (untilMs.value !== null && untilMs.value <= Date.now()) {
+    message.error("布置到的日期已经过了")
+    return
+  }
+  const body = {
+    title: form.title.trim(),
+    description: form.description.trim(),
+    visible: form.visible,
+    assignedUntil: untilMs.value === null ? null : new Date(untilMs.value).toISOString(),
+  }
+  saving.value = true
+  try {
+    if (editing.value) {
+      current.value = await editProblemSet(id.value, body)
+      message.success("改好了")
+      return
+    }
+    const created = await createProblemSet(body)
+    if (items.value.length) {
+      await addProblemsToSet(
+        created.id,
+        items.value.map((item) => item.displayId),
+      )
+      const optional = items.value.filter((item) => !item.isRequired).map((item) => item.displayId)
+      if (optional.length) {
+        const rows = await getProblemSetProblems(created.id)
+        for (const row of rows.filter((r) => optional.includes(r.problemDisplayId))) {
+          await setProblemRequired(created.id, row.id, false)
+        }
+      }
+    }
+    message.success(
+      items.value.length ? `题单建好了，${items.value.length} 道题都加进去了` : "题单建好了",
+    )
+    router.replace({ name: "admin problemset edit", params: { problemSetId: created.id } })
+  } catch (err) {
+    message.error(errorMessage(err))
  } finally {
-    loading.value = false
+    saving.value = false
  }
 }

-onMounted(() => {
-  if (isEdit.value) {
-    loadProblemSetDetail()
-  }
-})
+function removeSet() {
+  const set = current.value!
+  dialog.error({
+    title: `删除题单「${set.title}」？`,
+    content: set.participantCount
+      ? `${set.participantCount} 个人的进度和他们拿到的奖章会一起删掉，找不回来。只是不想让学生看到的话，关掉「公开」就行。`
+      : "还没有人加入。删掉找不回来。",
+    positiveText: "删除",
+    negativeText: "不删",
+    onPositiveClick: async () => {
+      try {
+        await deleteProblemSet(set.id)
+        router.replace({ name: "admin problemset list" })
+      } catch (err) {
+        message.error(errorMessage(err))
+      }
+    },
+  })
+}
+
+watch(() => props.problemSetId, load)
+onMounted(load)
 </script>

 <template>
-  <div>
-    <PageHeader
-      :title="isEdit ? '编辑题单' : '新建题单'"
-      :back="
-        isEdit
-          ? { name: 'admin problemset detail', params: { problemSetId } }
-          : { name: 'admin problemset list' }
-      "
-    />
+  <PageHeader :title="editing ? '编辑题单' : '新建题单'" :back="{ name: 'admin problemset list' }">
+    <template v-if="editing" #actions>
+      <n-button tag="a" :href="`/problemset/${problemSetId}`" target="_blank">
+        到前台看这个题单
+      </n-button>
+    </template>
+  </PageHeader>

-    <n-form :model="formData" label-placement="top">
-      <n-flex>
-        <n-form-item label="题单标题" required>
-          <n-input
-            v-model:value="formData.title"
-            placeholder="请输入题单标题"
-            maxlength="200"
-            show-count
-          />
-        </n-form-item>
-        <n-form-item label="难度">
-          <n-select
-            style="width: 100px"
-            v-model:value="formData.difficulty"
-            :options="difficultyOptions"
-            placeholder="选择难度"
-          />
-        </n-form-item>
-        <n-form-item label="状态">
-          <n-select
-            style="width: 100px"
-            v-model:value="formData.status"
-            :options="statusOptions"
-            placeholder="选择状态"
-          />
-        </n-form-item>
-        <n-form-item label="截止时间">
-          <n-date-picker
-            v-model:value="endTimeTimestamp"
-            type="datetime"
-            clearable
-            placeholder="不设置则无截止时间"
-          />
-        </n-form-item>
-        <n-form-item v-if="isEdit" label="是否可见">
-          <n-switch v-model:value="formData.visible" />
-        </n-form-item>
-      </n-flex>
+  <div v-if="ready" class="cols">
+    <section class="card form">
+      <div class="field">
+        <span class="label">名字</span>
+        <n-input v-model:value="form.title" placeholder="比如 字符串方法" maxlength="200" />
+      </div>
+      <div class="field">
+        <span class="label">说明</span>
+        <n-input v-model:value="form.description" placeholder="选填，比如：第 5 章 字符串方法" />
+      </div>

-      <n-form-item label="题单描述" required>
+      <div class="field top">
+        <span class="label">布置</span>
+        <div class="stack">
+          <n-flex :size="6" align="center">
+            <button class="chip" :class="{ on: choice === 'none' }" @click="choice = 'none'">
+              不布置
+            </button>
+            <button
+              v-for="c in CHOICES"
+              :key="c.days"
+              class="chip"
+              :class="{ on: choice === c.days }"
+              @click="choice = c.days"
+            >
+              {{ c.label }}
+            </button>
+            <button class="chip" :class="{ on: choice === 'pick' }" @click="choice = 'pick'">
+              选日期…
+            </button>
+            <n-date-picker
+              v-if="choice === 'pick'"
+              v-model:value="picked"
+              type="date"
+              :is-date-disabled="disabledDate"
+              style="width: 150px"
+            />
+          </n-flex>
+          <span class="hint">{{ assignHint }}</span>
+          <span class="hint">
+            布置期内，题单里这几道题学生以前交的代码先藏起来（不管加没加入），在题单里做对或者到期后再放出来，防止照着旧答案抄。不拦做题，到期后照样能做、照样算进度。
+          </span>
+        </div>
+      </div>
+
+      <div class="field">
+        <span class="label">公开</span>
+        <n-switch v-model:value="form.visible" />
+        <span class="hint">{{
+          form.visible ? "学生能在题单列表里看到" : "藏起来，学生看不到也进不去"
+        }}</span>
+      </div>
+
+      <div v-if="current" class="stats">
+        <span>{{ current.participantCount }} 人加入 · {{ current.completedCount }} 人做完</span>
+        <div class="spacer"></div>
+        <a :href="`/problemset/${current.id}?tab=class`" target="_blank">看全班情况 ›</a>
+      </div>
+
+      <div class="save">
+        <n-button type="primary" :loading="saving" @click="submit">保存</n-button>
+        <span class="hint"
+          >{{ items.length }} 道题<template v-if="optionalCount">
+            · {{ optionalCount }} 道选做</template
+          ><template v-if="editing"> · {{ badges.length }} 个奖章</template></span
+        >
+        <div class="spacer"></div>
+        <n-button v-if="editing" text type="error" @click="removeSet">删除题单</n-button>
+      </div>
+    </section>
+
+    <div class="right">
+      <section class="card picker">
+        <div class="picker-head">
+          <b>题目</b>
+          <span class="hint">{{ items.length }} 道 · 拖动排顺序 · 点「必做」切成选做</span>
+        </div>
        <n-input
-          v-model:value="formData.description"
-          type="textarea"
-          placeholder="请输入题单描述"
-          :rows="4"
+          v-model:value="keyword"
+          clearable
+          :loading="searching"
+          placeholder="搜题号或题目名；也能一次粘贴多个题号，如 3065 3066 3067"
+          @keyup.enter="pasted.length && addMany(pasted)"
        />
-      </n-form-item>
-      <n-form-item>
-        <n-button type="primary" :loading="loading" @click="handleSubmit">
-          {{ isEdit ? "更新" : "创建" }}
-        </n-button>
-      </n-form-item>
-    </n-form>
+        <div v-if="pasted.length" class="results">
+          <div class="result">
+            <span class="grow">粘贴了 {{ pasted.length }} 个题号：{{ pasted.join("、") }}</span>
+            <n-button size="small" type="primary" @click="addMany(pasted)">全部加进来</n-button>
+          </div>
+        </div>
+        <div v-else-if="results.length" class="results">
+          <div v-for="row in results" :key="row.id" class="result">
+            <span class="muted num">{{ row._id }}</span>
+            <span class="ell grow">{{ row.title }}</span>
+            <span v-if="added(row._id)" class="muted tiny">已加入</span>
+            <n-button v-else size="small" text type="primary" @click="addRow(row)">+ 加入</n-button>
+          </div>
+        </div>
+
+        <div v-if="items.length" class="list">
+          <div
+            v-for="(item, index) in items"
+            :key="item.displayId"
+            class="item"
+            :class="{ dragging: dragging === index }"
+            draggable="true"
+            @dragstart="onDragStart(index)"
+            @dragenter.prevent="onDragEnter(index)"
+            @dragover.prevent
+            @dragend="onDragEnd"
+          >
+            <span class="grip" aria-hidden="true">⋮⋮</span>
+            <b class="num idx">{{ index + 1 }}</b>
+            <span class="muted num tiny pid">{{ item.displayId }}</span>
+            <span class="ell grow">{{ item.title }}</span>
+            <button
+              class="chip small"
+              :class="{ dashed: item.isRequired }"
+              :title="item.isRequired ? '点一下改成选做' : '点一下改回必做'"
+              @click="toggleRequired(item)"
+            >
+              {{ item.isRequired ? "必做" : "选做" }}
+            </button>
+            <n-button size="small" text :aria-label="`拿掉 ${item.title}`" @click="remove(item)"
+              >✕</n-button
+            >
+          </div>
+        </div>
+        <div v-else class="empty hint">还没加题。在上面输入题号，比如 3065</div>
+      </section>
+
+      <section class="card picker">
+        <div class="picker-head">
+          <b>奖章</b>
+          <span class="hint">学生做对几道就发；改了条件会按现有进度重发</span>
+          <div class="spacer"></div>
+          <n-button v-if="editing" size="small" @click="openBadge(null)">+ 加奖章</n-button>
+        </div>
+        <div v-if="!editing" class="empty hint">先保存题单，再加奖章</div>
+        <div v-else-if="badges.length" class="list">
+          <div v-for="badge in badges" :key="badge.id" class="item badge">
+            <img :src="badge.icon" alt="" class="badge-icon" />
+            <b class="ell badge-name">{{ badge.name }}</b>
+            <span class="chip small static">{{ badgeCondition(badge) }}</span>
+            <span class="muted ell grow tiny">{{ badge.description }}</span>
+            <span class="muted num tiny">{{ badge.earnedCount }} 人拿到</span>
+            <n-button size="small" text type="primary" @click="openBadge(badge)">改</n-button>
+            <n-button
+              size="small"
+              text
+              :aria-label="`删掉 ${badge.name}`"
+              @click="removeBadge(badge)"
+              >✕</n-button
+            >
+          </div>
+        </div>
+        <div v-else class="empty hint">还没有奖章。比如「做对 3 道」发一个、「全部做完」发一个</div>
+      </section>
+    </div>
  </div>
+
+  <BadgeModal
+    v-model:show="badgeModal"
+    :badge="editingBadge"
+    :problems-count="items.length"
+    @save="saveBadge"
+  />
 </template>
+
+<style scoped>
+.cols {
+  display: flex;
+  flex-wrap: wrap;
+  gap: 16px;
+  align-items: flex-start;
+}
+
+.card {
+  box-sizing: border-box;
+  padding: 18px 20px;
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+}
+
+.form {
+  flex: 1 1 420px;
+  max-width: 480px;
+}
+
+.right {
+  flex: 999 1 480px;
+  min-width: 0;
+  display: flex;
+  flex-direction: column;
+  gap: 16px;
+}
+
+.picker {
+  gap: 10px;
+}
+
+.picker-head {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+}
+
+.picker-head b {
+  font-size: 15px;
+}
+
+.field {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.field.top {
+  align-items: flex-start;
+}
+
+.field.top .label {
+  line-height: 28px;
+}
+
+.label {
+  width: 40px;
+  flex-shrink: 0;
+  font-size: 13px;
+  color: v-bind("theme.textColor2");
+}
+
+.stack {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  min-width: 0;
+}
+
+.grow {
+  flex-grow: 1;
+  min-width: 0;
+}
+
+.spacer {
+  flex-grow: 1;
+}
+
+.hint {
+  font-size: 12px;
+  line-height: 1.6;
+  color: v-bind("theme.textColor3");
+}
+
+.muted {
+  color: v-bind("theme.textColor3");
+}
+
+.tiny {
+  font-size: 12px;
+  flex-shrink: 0;
+}
+
+.num {
+  font-variant-numeric: tabular-nums;
+}
+
+.ell {
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.chip {
+  height: 28px;
+  padding: 0 12px;
+  border-radius: 14px;
+  border: 1px solid v-bind("theme.borderColor");
+  background: transparent;
+  font: inherit;
+  font-size: 13px;
+  color: v-bind("theme.textColor2");
+  cursor: pointer;
+  white-space: nowrap;
+}
+
+.chip.on {
+  border-color: v-bind("theme.primaryColor");
+  color: v-bind("theme.primaryColor");
+  font-weight: 600;
+}
+
+.chip.small {
+  height: 22px;
+  padding: 0 8px;
+  font-size: 12px;
+  flex-shrink: 0;
+}
+
+.chip.dashed {
+  border-style: dashed;
+  color: v-bind("theme.textColor3");
+}
+
+.chip.static {
+  cursor: default;
+}
+
+.stats {
+  display: flex;
+  align-items: center;
+  box-sizing: border-box;
+  padding: 10px 12px;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  font-size: 13px;
+  background: v-bind("theme.actionColor");
+}
+
+.stats a {
+  color: v-bind("theme.primaryColor");
+  text-decoration: none;
+}
+
+.save {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  padding-top: 12px;
+  border-top: 1px solid v-bind("theme.dividerColor");
+}
+
+.results {
+  margin-top: -4px;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  overflow: hidden;
+  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.08);
+}
+
+.result {
+  height: 36px;
+  box-sizing: border-box;
+  padding: 0 12px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  font-size: 13px;
+}
+
+.result + .result {
+  border-top: 1px solid v-bind("theme.dividerColor");
+}
+
+.list {
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  overflow: hidden;
+}
+
+.item {
+  height: 36px;
+  box-sizing: border-box;
+  padding: 0 12px;
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  font-size: 14px;
+  background: v-bind("theme.cardColor");
+}
+
+.item + .item {
+  border-top: 1px solid v-bind("theme.dividerColor");
+}
+
+.item.dragging {
+  opacity: 0.5;
+}
+
+.item.badge {
+  height: 42px;
+}
+
+.grip {
+  cursor: grab;
+  color: v-bind("theme.textColor3");
+  letter-spacing: -3px;
+  user-select: none;
+}
+
+.idx {
+  width: 20px;
+  text-align: right;
+}
+
+.pid {
+  width: 40px;
+}
+
+.badge-icon {
+  width: 26px;
+  height: 26px;
+  flex-shrink: 0;
+}
+
+.badge-name {
+  width: 80px;
+  flex-shrink: 0;
+}
+
+.empty {
+  padding: 16px 0;
+  text-align: center;
+}
+</style>
@@ -5,87 +5,68 @@ import { usePagination } from "shared/composables/pagination"
 import { parseTime } from "utils/functions"
 import type { AdminProblemSet } from "utils/types"
 import { getProblemSetList, toggleProblemSetVisible } from "../api"
-import Actions from "./components/Actions.vue"
-import { NTag, NSwitch } from "naive-ui"
+import { NButton, NSwitch, NTag } from "naive-ui"

+/**
+ * 后台题单列表。难度、状态两列和筛选拿掉了（线上全是简单 / 活跃，「状态 + 可见」合成了「公开」），
+ * 换成老师真正关心的：几道题、多少人加入 / 做完、布置到哪天。点一行进一屏编辑
+ */
+const router = useRouter()
 const total = ref(0)
 const problemSets = ref<AdminProblemSet[]>([])

-interface ProblemSetQuery {
-  keyword: string
-  difficulty: string
-  status: string
+const { query, clearQuery } = usePagination<{ keyword: string }>({ keyword: "" })
+
+function edit(row: AdminProblemSet) {
+  router.push({ name: "admin problemset edit", params: { problemSetId: row.id } })
 }

-// 使用分页 composable
-const { query, clearQuery } = usePagination<ProblemSetQuery>({
-  keyword: "",
-  difficulty: "",
-  status: "",
-})
-
-const difficultyOptions = [
-  { label: "全部", value: "" },
-  { label: "简单", value: "Easy" },
-  { label: "中等", value: "Medium" },
-  { label: "困难", value: "Hard" },
-]
-
-const statusOptions = [
-  { label: "全部", value: "" },
-  { label: "活跃", value: "active" },
-  { label: "已归档", value: "archived" },
-  { label: "草稿", value: "draft" },
-]
-
 const columns: DataTableColumn<AdminProblemSet>[] = [
-  { title: "ID", key: "id", width: 80 },
-  { title: "标题", key: "title", minWidth: 200 },
-  { title: "描述", key: "description", minWidth: 300, ellipsis: true },
+  { title: "ID", key: "id", width: 70 },
+  {
+    title: "题单",
+    key: "title",
+    minWidth: 200,
+    render: (row) =>
+      h(NButton, { text: true, onClick: () => edit(row) }, { default: () => row.title }),
+  },
+  { title: "题数", key: "problemsCount", width: 70 },
+  {
+    title: "加入 / 做完",
+    key: "participantCount",
+    width: 110,
+    render: (row) => `${row.participantCount} / ${row.completedCount}`,
+  },
+  { title: "奖章", key: "badgeCount", width: 70 },
+  {
+    title: "布置",
+    key: "assignedUntil",
+    width: 130,
+    render: (row) =>
+      row.assigning
+        ? h(
+            NTag,
+            { type: "info", size: "small", bordered: false },
+            { default: () => `到 ${parseTime(row.assignedUntil!, "M月D日")}` },
+          )
+        : "—",
+  },
  {
    title: "创建者",
-    key: "created_by",
-    width: 120,
+    key: "createdBy",
+    width: 110,
    render: (row) => row.createdBy.username,
  },
-  {
-    title: "难度",
-    key: "difficulty",
-    width: 100,
-    render: (row) => {
-      const difficultyMap = {
-        Easy: { type: "success" as const, text: "简单" },
-        Medium: { type: "warning" as const, text: "中等" },
-        Hard: { type: "error" as const, text: "困难" },
-      }
-      const config = difficultyMap[row.difficulty]
-      return h(NTag, { type: config.type, size: "small" }, { default: () => config.text })
-    },
-  },
-  {
-    title: "状态",
-    key: "status",
-    width: 100,
-    render: (row) => {
-      const statusMap = {
-        active: { type: "success" as const, text: "活跃" },
-        archived: { type: "default" as const, text: "已归档" },
-        draft: { type: "info" as const, text: "草稿" },
-      }
-      const config = statusMap[row.status]
-      return h(NTag, { type: config.type, size: "small" }, { default: () => config.text })
-    },
-  },
  {
    title: "创建时间",
-    key: "create_time",
-    width: 180,
-    render: (row) => parseTime(row.createTime, "YYYY-MM-DD HH:mm:ss"),
+    key: "createTime",
+    width: 120,
+    render: (row) => parseTime(row.createTime, "YYYY-MM-DD"),
  },
  {
-    title: "可见",
+    title: "公开",
    key: "visible",
-    width: 100,
+    width: 80,
    render: (row) =>
      h(NSwitch, {
        value: row.visible,
@@ -94,84 +75,41 @@ const columns: DataTableColumn<AdminProblemSet>[] = [
        onUpdateValue: () => toggleVisible(row.id),
      }),
  },
-  {
-    title: "选项",
-    key: "actions",
-    fixed: "right",
-    width: 300,
-    render: (row) =>
-      h(Actions, {
-        problemSetId: row.id,
-        onUpdated: listProblemSets,
-      }),
-  },
 ]

 async function listProblemSets() {
  if (query.page < 1) query.page = 1
  const offset = (query.page - 1) * query.limit
-  const res = await getProblemSetList(
-    offset,
-    query.limit,
-    query.keyword,
-    query.difficulty,
-    query.status,
-  )
+  const res = await getProblemSetList(offset, query.limit, query.keyword)
  total.value = res.total
  problemSets.value = res.results
 }

 async function toggleVisible(problemSetId: number) {
-  await toggleProblemSetVisible(problemSetId)
-  problemSets.value = problemSets.value.map((it) => {
-    if (it.id === problemSetId) {
-      it.visible = !it.visible
-    }
-    return it
-  })
+  const updated = await toggleProblemSetVisible(problemSetId)
+  problemSets.value = problemSets.value.map((it) => (it.id === problemSetId ? updated : it))
 }

 onMounted(listProblemSets)
-
-// 监听搜索关键词变化（防抖）
-watchDebounced(() => query.keyword, listProblemSets, {
-  debounce: 500,
-  maxWait: 1000,
-})
-
-// 监听其他查询条件变化
-watch(() => [query.page, query.limit, query.difficulty, query.status], listProblemSets)
+watchDebounced(() => query.keyword, listProblemSets, { debounce: 500, maxWait: 1000 })
+watch(() => [query.page, query.limit], listProblemSets)
 </script>

 <template>
  <PageHeader title="题单列表">
    <template #actions>
-      <n-button type="primary" @click="$router.push({ name: 'admin problemset create' })">
+      <n-button type="primary" @click="router.push({ name: 'admin problemset create' })">
        新建题单
      </n-button>
    </template>
    <template #filters>
      <n-input
        v-model:value="query.keyword"
-        placeholder="输入标题关键字"
+        placeholder="搜题单名字"
        clearable
        @clear="clearQuery"
        style="width: 220px"
      />
-      <n-select
-        v-model:value="query.difficulty"
-        :options="difficultyOptions"
-        placeholder="全部难度"
-        style="width: 120px"
-        clearable
-      />
-      <n-select
-        v-model:value="query.status"
-        :options="statusOptions"
-        placeholder="全部状态"
-        style="width: 120px"
-        clearable
-      />
    </template>
  </PageHeader>
  <n-data-table striped :columns="columns" :data="problemSets" />
@@ -36,10 +36,10 @@ import {
  type HeatmapItem,
  type SolvedList,
  type ProblemSet,
-  type ProblemSetBadge,
+  type ProblemSetClassView,
  type ProblemSetList,
+  type ProblemSetLock,
  type ProblemSetProblem,
-  type ProblemSetProgressList,
  type UserBadge,
  type FlowchartStatistics,
  type SubmissionStatistics,
@@ -482,23 +482,15 @@ export function retryFlowchartSubmission(submissionId: string) {
  return api.post<{ status: string }>(`flowcharts/${encodeURIComponent(submissionId)}/retry`)
 }

-/** 自己在这道题上评完的每一次（早的在前），加入题单之前的已经滤掉 */
+/** 自己在这道题上评完的每一次（早的在前），题单布置期内藏着的已经滤掉 */
 export function getFlowchartScores(problemId: number) {
  return api.get<FlowchartScores>(`problems/${problemId}/flowchart/scores`)
 }

 // ==================== 题单相关API ====================

-export function getProblemSetList(
-  offset = 0,
-  limit = 10,
-  keyword = "",
-  difficulty = "",
-  status = "",
-) {
-  return api.get<ProblemSetList>("problem-sets", {
-    params: { offset, limit, keyword, difficulty, status },
-  })
+export function getProblemSetList(offset = 0, limit = 10, keyword = "") {
+  return api.get<ProblemSetList>("problem-sets", { params: { offset, limit, keyword } })
 }

 export function getProblemSetDetail(id: number) {
@@ -517,20 +509,18 @@ export function getUserBadges(username?: string) {
  return api.get<UserBadge[]>(`users/${encodeURIComponent(username ?? "me")}/badges`)
 }

-export function getProblemSetBadges(problemSetId: number) {
-  return api.get<ProblemSetBadge[]>(`problem-sets/${problemSetId}/badges`)
+/** 老师看某个班在题单里的情况；不传班级就看服务端推断的那个班 */
+export function getProblemSetClassView(problemSetId: number, className = "") {
+  return api.get<ProblemSetClassView>(`problem-sets/${problemSetId}/class-view`, {
+    params: className ? { className } : {},
+  })
 }

-export function getProblemSetUserProgress(
-  problemSetId: number,
-  params?: {
-    limit?: number
-    offset?: number
-    className?: string
-    completionStatus?: "" | "completed" | "in_progress" | "not_started"
-  },
-) {
-  return api.get<ProblemSetProgressList>(`problem-sets/${problemSetId}/user-progress`, { params })
+/** 这道题以前的代码为什么藏着：落在哪些正在布置的题单里。传主键或题号都行 */
+export function getProblemSetLocks(problem: { id: number } | { displayId: string }) {
+  return api.get<ProblemSetLock[]>("problem-sets/locks", {
+    params: "id" in problem ? { problemId: problem.id } : { problemDisplayId: problem.displayId },
+  })
 }

 export function getExercises(tutorialId: number): Promise<Exercise[]> {
@@ -1,7 +1,7 @@
 <script setup lang="ts">
 import { storeToRefs } from "pinia"
 import type { RouteLocationRaw } from "vue-router"
-import { getProblemSetDetail, getProblemSetProblems } from "oj/api"
+import { getProblemSetDetail, getProblemSetProblems, joinProblemSet } from "oj/api"
 import { useContestStore } from "oj/store/contest"
 import { isFlowchartPass, useFlowchartStore } from "oj/store/flowchart"
 import { useLessonStore } from "oj/store/lesson"
@@ -161,6 +161,7 @@ const setBar = computed(() => {
  const done = required.filter((item) => item.isCompleted).length
  return {
    title: problemSet.value.title,
+    joined: problemSet.value.userProgress.isJoined,
    home: { name: "problemset", params: { problemSetId: ctx.value.problemSetId } },
    done,
    total: required.length,
@@ -171,6 +172,22 @@ const setBar = computed(() => {
  }
 })

+// 没加入就点进了题（直接打开的链接）：在条上给个「加入」，不然做对了也不记进度
+const joiningSet = ref(false)
+async function joinHere() {
+  const id = ctx.value.problemSetId
+  if (!id || joiningSet.value) return
+  joiningSet.value = true
+  try {
+    await joinProblemSet(Number(id))
+    problemSet.value = await getProblemSetDetail(Number(id))
+  } catch {
+    // 加入失败就还是那条提示，回题单页再点一次
+  } finally {
+    joiningSet.value = false
+  }
+}
+
 // 判题那一路已经记了账（judge/run.ts），这里只是把这一条就地改掉，不用重拉
 onSolvedHere(() => {
  const item = setProblems.value.find(
@@ -294,13 +311,19 @@ onSolvedHere(() => {
    <router-link :to="setBar.home" class="back set-back" :title="`回到题单：${setBar.title}`">
      ‹ {{ setBar.title }}
    </router-link>
-    <div class="set-progress" aria-hidden="true">
+    <div v-if="setBar.joined" class="set-progress" aria-hidden="true">
      <div class="set-progress-fill" :style="{ width: `${setBar.percentage}%` }" />
    </div>
-    <span class="meta">
+    <span v-if="setBar.joined" class="meta">
      做完 {{ setBar.done }}/{{ setBar.total }}
      <template v-if="setBar.position"> · 第 {{ setBar.position }} 题</template>
    </span>
+    <template v-else>
+      <span class="meta">还没加入，在这里做对了不算进度</span>
+      <n-button size="tiny" type="primary" :loading="joiningSet" @click="joinHere"
+        >加入题单</n-button
+      >
+    </template>
    <div class="spacer" />
    <component
      :is="setBar.previous ? 'router-link' : 'span'"
@@ -236,7 +236,8 @@ function goCode() {
      </template>
    </div>
    <p v-if="hiddenCount" class="note">
-      另外 {{ hiddenCount }} 次是加入题单之前画的，先藏起来了：在题单里画到 A 或 S 就解锁
+      另外 {{ hiddenCount }} 次是题单布置之前画的，先藏起来了：在题单里画到 A 或
+      S，或者布置期结束就解锁
    </p>

    <!-- 正在评：评的是最新这一次，所以只在看最新时显示 -->
@@ -3,6 +3,7 @@ import { useThemeVars } from "naive-ui"
 import { getRankOfProblem, getSubmission, getSubmissions } from "oj/api"
 import { useCodeStore } from "oj/store/code"
 import { useProblemStore } from "oj/store/problem"
+import LockNote from "oj/problemset/components/LockNote.vue"
 import Pagination from "shared/components/Pagination.vue"
 import { useCollabStore } from "shared/store/collab"
 import { useUserStore } from "shared/store/user"
@@ -139,7 +140,7 @@ type Loaded = { code: string; language: LANGUAGE }
 const details = reactive<Record<string, Loaded | "loading" | "failed">>({})

 async function toggle(row: SubmissionListItem) {
-  // 加入题单之前的提交被锁住，点不开（后端也不会给代码）
+  // 题单布置期内藏着的旧提交，点不开（后端也不会给代码）
  if (!row.showLink) return
  if (expanded.value === row.id) {
    expanded.value = null
@@ -332,7 +333,7 @@ watch(query, () => {
          </div>
        </div>
      </template>
-      <!-- 加入题单之前交的那几次：合成一行，点不开（后端也不给代码） -->
+      <!-- 题单布置期内藏着的那几次：合成一行，点不开（后端也不给代码） -->
      <div v-if="lockedCount" class="locked">
        <svg
          width="13"
@@ -349,8 +350,9 @@ watch(query, () => {
          <path d="M8 11V8a4 4 0 018 0v3" />
        </svg>
        <span>
-          加入题单之前的
-          {{ lockedCount }} 次提交先藏起来了，在题单里做出这道题就能看（题单过了截止时间也会解锁）
+          有 {{ lockedCount }} 次提交先藏起来了：<LockNote
+            :problem="{ displayId: problemDisplayId }"
+          />
        </span>
      </div>
    </div>
@@ -0,0 +1,37 @@
+import type { ProblemSet, ProblemSetBadge } from "utils/types"
+
+/**
+ * 奖章的两种条件和后端 eligibleForBadge 同一个口径：
+ *   - 全部做完：必做题全对（completedCount === totalCount）
+ *   - 做对 N 道：做对的全部题数（含选做，solvedCount）≥ N
+ */
+export function badgeCondition(badge: ProblemSetBadge) {
+  return badge.conditionType === "all_problems" ? "全部做完" : `做对 ${badge.conditionValue} 道`
+}
+
+/** 拿到这枚奖章还差几道；已经拿到为 0 */
+export function badgeShortfall(badge: ProblemSetBadge, set: ProblemSet) {
+  if (badge.isEarned) return 0
+  const progress = set.userProgress
+  const remaining =
+    badge.conditionType === "all_problems"
+      ? set.requiredCount - progress.completedCount
+      : badge.conditionValue - progress.solvedCount
+  return Math.max(1, remaining)
+}
+
+/** 阶梯顺序：按要做对的题数从少到多，「全部做完」排最后 */
+export function ladder(set: ProblemSet) {
+  const need = (badge: ProblemSetBadge) =>
+    badge.conditionType === "all_problems" ? Number.MAX_SAFE_INTEGER : badge.conditionValue
+  return [...set.badges].sort((a, b) => need(a) - need(b) || a.id - b.id)
+}
+
+/** 下一枚最近的奖章和还差几道；全拿到了（或者没有奖章）为 null */
+export function nextBadge(set: ProblemSet) {
+  const pending = ladder(set).filter((badge) => !badge.isEarned)
+  if (pending.length === 0) return null
+  const scored = pending.map((badge) => ({ badge, left: badgeShortfall(badge, set) }))
+  scored.sort((a, b) => a.left - b.left)
+  return scored[0]!
+}
@@ -0,0 +1,143 @@
+<script setup lang="ts">
+import { useThemeVars } from "naive-ui"
+import { useTone } from "oj/submission/composables/tone"
+import { parseTime } from "utils/functions"
+import type { ProblemSet } from "utils/types"
+import { badgeCondition, badgeShortfall, ladder, nextBadge } from "../badges"
+
+/**
+ * 奖章阶梯（设计稿「题单重设计」详情 B）：一排奖章连成一条线，拿到的亮、写哪天拿的；
+ * 下一个要拿的套金圈、写「再做对 n 道」；更远的灰着、写条件。
+ */
+const props = defineProps<{ set: ProblemSet }>()
+const theme = useThemeVars()
+const tone = useTone()
+
+const steps = computed(() => {
+  const next = nextBadge(props.set)?.badge.id
+  return ladder(props.set).map((badge) => ({
+    badge,
+    next: badge.id === next,
+    sub: badge.isEarned
+      ? badge.earnedTime
+        ? parseTime(badge.earnedTime, "M月D日")
+        : "拿到了"
+      : badge.id === next && props.set.userProgress.isJoined
+        ? `再做对 ${badgeShortfall(badge, props.set)} 道`
+        : badgeCondition(badge),
+  }))
+})
+
+/** 连线亮到最后一枚拿到的奖章那里 */
+const filled = computed(() => {
+  const last = steps.value.map((step) => step.badge.isEarned).lastIndexOf(true)
+  return steps.value.length > 1 && last > 0 ? last / (steps.value.length - 1) : 0
+})
+
+const warning = computed(() => tone("warning"))
+</script>
+
+<template>
+  <div class="ladder" :style="{ width: `${steps.length * 92}px` }">
+    <div v-if="steps.length > 1" class="track">
+      <div class="track-fill" :style="{ width: `${filled * 100}%` }"></div>
+    </div>
+    <div
+      v-for="step in steps"
+      :key="step.badge.id"
+      class="step"
+      :title="`${step.badge.name} · ${badgeCondition(step.badge)}${step.badge.description ? `\n${step.badge.description}` : ''}`"
+    >
+      <span class="medal" :class="{ next: step.next }">
+        <img
+          :src="step.badge.icon"
+          :alt="step.badge.name"
+          :class="{ locked: !step.badge.isEarned }"
+        />
+      </span>
+      <b class="name" :class="{ dim: !step.badge.isEarned }">{{ step.badge.name }}</b>
+      <span class="sub" :class="{ urge: step.next && !step.badge.isEarned }">{{ step.sub }}</span>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.ladder {
+  position: relative;
+  display: flex;
+  flex-shrink: 0;
+}
+
+.track {
+  position: absolute;
+  left: 46px;
+  right: 46px;
+  top: 21px;
+  height: 3px;
+  background: v-bind("theme.dividerColor");
+}
+
+.track-fill {
+  height: 100%;
+  background: v-bind("theme.successColor");
+}
+
+.step {
+  position: relative;
+  width: 92px;
+  flex-shrink: 0;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  gap: 3px;
+}
+
+.medal {
+  width: 44px;
+  height: 44px;
+  border-radius: 50%;
+  background: v-bind("theme.cardColor");
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.medal.next {
+  box-shadow: 0 0 0 2px #f0b44c;
+}
+
+.medal img {
+  width: 36px;
+  height: 36px;
+}
+
+.locked {
+  filter: grayscale(1);
+  opacity: 0.35;
+}
+
+.name {
+  max-width: 88px;
+  font-size: 12px;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.name.dim {
+  color: v-bind("theme.textColor3");
+  font-weight: 400;
+}
+
+.sub {
+  font-size: 11px;
+  font-variant-numeric: tabular-nums;
+  color: v-bind("theme.textColor3");
+  white-space: nowrap;
+}
+
+.sub.urge {
+  color: v-bind("warning.color");
+  font-weight: 600;
+}
+</style>
@@ -0,0 +1,342 @@
+<script setup lang="ts">
+import { useThemeVars } from "naive-ui"
+import { getProblemSetClassView } from "oj/api"
+import { useTone } from "oj/submission/composables/tone"
+import { parseTime } from "utils/functions"
+import type { ProblemSetClassView } from "utils/types"
+
+/**
+ * 老师看一个班在题单里的情况（设计稿「题单重设计」老师 · 全班情况）：真名 × 每道题，
+ * 格子里写几点做对 / 错了几次；紫色角 = 加入之前就做对过（可能是凭记忆默写的）。
+ * 没加入的人在上面点名。班级默认是服务端推断的（最近在做的那个班），可以换。
+ * 点格子到提交列表看这个学生这道题的代码。
+ */
+const props = defineProps<{ problemSetId: number }>()
+const theme = useThemeVars()
+const tone = useTone()
+
+const data = ref<ProblemSetClassView | null>(null)
+const className = ref("")
+const loading = ref(false)
+
+async function load() {
+  loading.value = true
+  try {
+    data.value = await getProblemSetClassView(props.problemSetId, className.value)
+    className.value = data.value.className ?? ""
+  } finally {
+    loading.value = false
+  }
+}
+
+onMounted(load)
+watch(className, (value, old) => {
+  if (old && value !== data.value?.className) load()
+})
+
+function classLabel(name: string) {
+  return /^\d{3,}$/.test(name) ? `${name.slice(0, 2)}计算机${name.slice(2)}班` : name
+}
+
+const classOptions = computed(() =>
+  (data.value?.classes ?? []).map((item) => ({
+    value: item.className,
+    label: `${classLabel(item.className)}（${item.joined}/${item.size} 人加入）`,
+  })),
+)
+
+const joined = computed(() => data.value?.students.filter((s) => s.joinTime) ?? [])
+const absent = computed(() => data.value?.students.filter((s) => !s.joinTime) ?? [])
+const average = computed(() =>
+  joined.value.length
+    ? joined.value.reduce((sum, s) => sum + s.completedCount, 0) / joined.value.length
+    : 0,
+)
+const finished = computed(
+  () => joined.value.filter((s) => data.value && s.completedCount >= data.value.totalCount).length,
+)
+const beforeCount = computed(() =>
+  joined.value.reduce((sum, s) => sum + s.cells.filter((cell) => cell.solvedBefore).length, 0),
+)
+
+const columns = computed(
+  () => `22px 72px 44px repeat(${data.value?.problems.length ?? 1}, minmax(72px, 1fr))`,
+)
+
+function name(student: { realName: string | null; username: string }) {
+  return student.realName || student.username
+}
+
+function cellLink(username: string, problemId: string) {
+  return `/submission?username=${encodeURIComponent(username)}&problem=${encodeURIComponent(problemId)}`
+}
+
+function cellTime(time: string) {
+  const today = parseTime(new Date(), "YYYY-MM-DD") === parseTime(time, "YYYY-MM-DD")
+  return parseTime(time, today ? "HH:mm" : "M/D")
+}
+
+const success = computed(() => tone("success"))
+const warning = computed(() => tone("warning"))
+const error = computed(() => tone("error"))
+</script>
+
+<template>
+  <section class="card">
+    <div v-if="data && !data.className" class="empty muted">还没有学生加入这个题单</div>
+    <template v-else-if="data">
+      <div class="summary">
+        <n-select
+          v-model:value="className"
+          :options="classOptions"
+          size="small"
+          class="pick"
+          :consistent-menu-width="false"
+        />
+        <span
+          ><b class="num big">{{ joined.length }}</b
+          ><span class="muted"> / {{ data.students.length }} 人加入</span></span
+        >
+        <span
+          ><span class="muted">平均做对</span> <b class="num big">{{ average.toFixed(1) }}</b
+          ><span class="muted"> / {{ data.totalCount }} 道</span></span
+        >
+        <span
+          ><span class="muted">做完</span> <b class="num big">{{ finished }}</b
+          ><span class="muted"> 人</span></span
+        >
+        <span v-if="absent.length" class="absent ell" :title="absent.map(name).join('、')"
+          >没加入：{{ absent.map(name).join("、") }}</span
+        >
+        <div class="spacer"></div>
+        <span v-if="beforeCount" class="legend-before"
+          ><span class="corner"></span>加入前就做对过（{{ beforeCount }} 格）</span
+        >
+      </div>
+
+      <div class="scroll">
+        <div class="grid" :style="{ gridTemplateColumns: columns }">
+          <div class="head"></div>
+          <div class="head">姓名</div>
+          <div class="head right">做对</div>
+          <div v-for="(p, i) in data.problems" :key="p.id" class="head col" :title="p.title">
+            <b class="ell">{{ i + 1 }} {{ p.title }}</b>
+            <span class="num"
+              >{{ p.solved }} 人对<template v-if="!p.isRequired"> · 选做</template></span
+            >
+          </div>
+
+          <template v-for="(s, idx) in joined" :key="s.userId">
+            <div class="cell muted num tiny">{{ idx + 1 }}</div>
+            <div class="cell ell" :title="s.username">
+              <b>{{ name(s) }}</b>
+            </div>
+            <div class="cell right num">
+              <b>{{ s.completedCount }}</b>
+            </div>
+            <a
+              v-for="(c, i) in s.cells"
+              :key="i"
+              :href="cellLink(s.username, data.problems[i]!._id)"
+              target="_blank"
+              class="box"
+              :class="{ ok: c.solvedTime, bad: !c.solvedTime && c.wrongCount }"
+              :title="`${name(s)} · ${data.problems[i]!.title}${c.solvedBefore ? ' · 加入前就做对过' : ''}`"
+            >
+              <template v-if="c.solvedTime"
+                >✓ <span class="num">{{ cellTime(c.solvedTime) }}</span></template
+              >
+              <template v-else-if="c.wrongCount">错 {{ c.wrongCount }} 次</template>
+              <span v-if="c.solvedBefore" class="corner"></span>
+            </a>
+          </template>
+        </div>
+      </div>
+      <div class="foot muted">
+        <span>绿 = 在题单里做对（几点做对的）</span><span>黄 = 交过还没对</span
+        ><span>紫色角 = 加入前就做对过</span><span>点格子看这个学生这道题的提交</span>
+        <div class="spacer"></div>
+        <span>按学号排</span>
+      </div>
+    </template>
+    <div v-else class="empty"><n-spin size="small" /></div>
+  </section>
+</template>
+
+<style scoped>
+.card {
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+  overflow: hidden;
+}
+
+.empty {
+  padding: 40px;
+  text-align: center;
+}
+
+.summary {
+  min-height: 52px;
+  box-sizing: border-box;
+  padding: 8px 16px;
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 8px 20px;
+  font-size: 13px;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+}
+
+.pick {
+  width: 240px;
+}
+
+.big {
+  font-size: 18px;
+}
+
+.absent {
+  max-width: 420px;
+  color: v-bind("error.color");
+}
+
+.legend-before {
+  display: inline-flex;
+  align-items: center;
+  gap: 6px;
+  color: #5b3fa8;
+}
+
+.legend-before .corner {
+  position: static;
+}
+
+.scroll {
+  overflow-x: auto;
+}
+
+.grid {
+  display: grid;
+  column-gap: 6px;
+  padding: 0 16px 8px;
+}
+
+.head {
+  position: sticky;
+  top: 0;
+  height: 44px;
+  display: flex;
+  flex-direction: column;
+  justify-content: center;
+  font-size: 12px;
+  color: v-bind("theme.textColor3");
+  background: v-bind("theme.cardColor");
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+  margin-bottom: 4px;
+}
+
+.head.col {
+  align-items: center;
+  line-height: 16px;
+  min-width: 0;
+  overflow: hidden;
+}
+
+.head.col b {
+  max-width: 100%;
+  color: v-bind("theme.textColor2");
+}
+
+.right {
+  text-align: right;
+  align-items: flex-end;
+  padding-right: 8px;
+}
+
+.cell {
+  height: 32px;
+  display: flex;
+  align-items: center;
+  font-size: 14px;
+  min-width: 0;
+}
+
+.cell.right {
+  justify-content: flex-end;
+}
+
+.box {
+  position: relative;
+  height: 26px;
+  margin: 3px 0;
+  border-radius: 3px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  gap: 3px;
+  font-size: 12px;
+  text-decoration: none;
+  background: v-bind("theme.actionColor");
+  color: v-bind("theme.textColor3");
+}
+
+.box.ok {
+  background: v-bind("success.background");
+  color: v-bind("success.color");
+}
+
+.box.bad {
+  background: v-bind("warning.background");
+  color: v-bind("warning.color");
+}
+
+.box:hover {
+  outline: 1px solid v-bind("theme.primaryColor");
+}
+
+.corner {
+  position: absolute;
+  top: 2px;
+  right: 3px;
+  width: 0;
+  height: 0;
+  border-top: 8px solid #7a5fd0;
+  border-left: 8px solid transparent;
+}
+
+.foot {
+  min-height: 30px;
+  box-sizing: border-box;
+  padding: 6px 16px;
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 4px 16px;
+  font-size: 12px;
+  border-top: 1px solid v-bind("theme.dividerColor");
+}
+
+.spacer {
+  flex-grow: 1;
+}
+
+.muted {
+  color: v-bind("theme.textColor3");
+}
+
+.tiny {
+  font-size: 12px;
+}
+
+.num {
+  font-variant-numeric: tabular-nums;
+}
+
+.ell {
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+</style>
@@ -0,0 +1,47 @@
+<script setup lang="ts">
+import { useThemeVars } from "naive-ui"
+import { getProblemSetLocks } from "oj/api"
+import { parseTime } from "utils/functions"
+import type { ProblemSetLock } from "utils/types"
+
+/**
+ * 「旧代码为什么藏着」那一句（设计稿「题单重设计」旧代码藏着时学生看到的）：
+ * 题单《X》布置中，这道题以前的代码先藏着 · 在题单里做对，或 M月D日 之后就能看。
+ * 规则在后端 problemSetLockCutoffs；查不到是哪个题单（比如刚过期）就说通用的一句
+ */
+const props = defineProps<{ problem: { id: number } | { displayId: string } }>()
+const theme = useThemeVars()
+
+const locks = ref<ProblemSetLock[]>([])
+
+watch(
+  () => ("id" in props.problem ? props.problem.id : props.problem.displayId),
+  async () => {
+    try {
+      locks.value = await getProblemSetLocks(props.problem)
+    } catch {
+      locks.value = []
+    }
+  },
+  { immediate: true },
+)
+
+const first = computed(() => locks.value[0])
+</script>
+
+<template>
+  <span v-if="first">
+    题单<router-link :to="{ name: 'problemset', params: { problemSetId: first.problemSetId } }"
+      >《{{ first.title }}》</router-link
+    >布置中，这道题以前的代码先藏着 · 在题单里做对，或
+    {{ parseTime(first.assignedUntil, "M月D日") }} 之后就能看
+  </span>
+  <span v-else>这道题正在题单里布置，以前的代码先藏着 · 在题单里做对，或者布置期结束就能看</span>
+</template>
+
+<style scoped>
+a {
+  color: v-bind("theme.primaryColor");
+  text-decoration: none;
+}
+</style>
@@ -1,123 +0,0 @@
-<script setup lang="ts">
-import { Icon } from "@iconify/vue"
-import type { ProblemSet, UserBadge as UserBadgeType } from "utils/types"
-import { parseTime } from "utils/functions"
-import UserBadge from "shared/components/UserBadge.vue"
-import { useUserStore } from "shared/store/user"
-
-interface Props {
-  problemSet: ProblemSet
-  isJoined: boolean
-  isJoining: boolean
-  userBadges: UserBadgeType[]
-}
-
-interface Emits {
-  (e: "join"): void
-}
-
-const props = defineProps<Props>()
-const emit = defineEmits<Emits>()
-
-const userStore = useUserStore()
-
-function getDifficultyTag(difficulty: string) {
-  const difficultyMap: Record<
-    string,
-    { type: "success" | "warning" | "error" | "default"; text: string }
-  > = {
-    Easy: { type: "success", text: "简单" },
-    Medium: { type: "warning", text: "中等" },
-    Hard: { type: "error", text: "困难" },
-  }
-  return difficultyMap[difficulty] || { type: "default", text: "未知" }
-}
-
-// 进度一律读 userProgress：它的分母是**必做题数**，而 problemsCount 是总题数。
-// 拿总题数当分母的话，做完全部必做题的人会看到「9 / 10、90%」，而同一张卡片上
-// 又标着「已完成」—— 题单 6 那 10 个人正是这种。
-function getProgressPercentage() {
-  return Math.round(props.problemSet?.userProgress?.progressPercentage ?? 0)
-}
-
-// 有选做题时把「必做 N 题」标出来，否则「共 10 道题目」和「9 / 9」对不上
-const optionalCount = computed(
-  () => props.problemSet.problemsCount - (props.problemSet.userProgress?.totalCount ?? 0),
-)
-
-const endTimeText = computed(() =>
-  props.problemSet.endTime ? parseTime(props.problemSet.endTime, "YYYY-MM-DD HH:mm") : "",
-)
-
-function handleJoin() {
-  emit("join")
-}
-</script>
-
-<template>
-  <n-card style="margin-bottom: 24px">
-    <n-flex justify="space-between" align="center">
-      <n-flex align="center">
-        <n-tag type="warning" v-if="problemSet.status === 'archived'"> 已归档 </n-tag>
-        <n-tag :type="getDifficultyTag(problemSet.difficulty).type">
-          {{ getDifficultyTag(problemSet.difficulty).text }}
-        </n-tag>
-        <!-- 截止时间不是「到点不能做了」，是「到点之前看不到自己加入题单之前的旧代码」，
-             所以这里要连着解释一句，否则学生只看到一个日期，不知道它管什么 -->
-        <n-tooltip trigger="hover" v-if="endTimeText">
-          <template #trigger>
-            <n-tag type="info">截止 {{ endTimeText }}</n-tag>
-          </template>
-          这个时间之前，你在加入题单之前提交过的代码是看不到的；在题单里做出该题即可解锁。
-        </n-tooltip>
-        <n-h2 style="margin: 0">{{ problemSet.title }}</n-h2>
-        <n-tooltip trigger="hover" v-if="problemSet.description">
-          <template #trigger>
-            <Icon width="20" icon="fluent-emoji:information" />
-          </template>
-          {{ problemSet.description }}
-        </n-tooltip>
-      </n-flex>
-
-      <n-flex align="center" v-if="userStore.isAuthed">
-        <!-- 用户徽章显示区域 - 只在已加入且有徽章时显示 -->
-        <n-flex v-if="isJoined && userBadges.length > 0" align="center">
-          <n-text>已获徽章</n-text>
-          <UserBadge v-for="badge in userBadges" :key="badge.id" :badge="badge" />
-        </n-flex>
-
-        <!-- 完成进度 - 只在已加入时显示 -->
-        <n-flex align="center" v-if="isJoined">
-          <n-text strong>完成进度</n-text>
-          <n-text>
-            {{ problemSet.userProgress?.completedCount ?? 0 }} /
-            {{ problemSet.userProgress?.totalCount ?? 0 }}
-          </n-text>
-          <n-text depth="3" v-if="optionalCount > 0"> （另有 {{ optionalCount }} 道选做） </n-text>
-        </n-flex>
-        <n-progress
-          v-if="isJoined"
-          :percentage="getProgressPercentage()"
-          :height="8"
-          :border-radius="4"
-          style="width: 200px"
-        />
-        <n-button
-          v-if="!isJoined"
-          type="primary"
-          size="large"
-          :loading="isJoining"
-          @click="handleJoin"
-        >
-          加入题单
-        </n-button>
-        <n-tag v-else type="success" size="large">
-          <template #icon>
-            <Icon icon="ph:check-circle-fill" />
-          </template>
-          已加入
-        </n-tag>
-      </n-flex>
-    </n-flex>
-  </n-card>
-</template>
@@ -1,79 +0,0 @@
-<script setup lang="ts">
-import { Icon } from "@iconify/vue"
-import type { ProblemSetProblem } from "utils/types"
-import { DIFFICULTY } from "utils/constants"
-import { getTagColor } from "utils/functions"
-import { useBreakpoints } from "shared/composables/breakpoints"
-
-interface Props {
-  problems: ProblemSetProblem[]
-  isJoined: boolean
-}
-
-interface Emits {
-  (e: "problem-click", problemId: string): void
-}
-
-const props = defineProps<Props>()
-const emit = defineEmits<Emits>()
-
-const { isDesktop } = useBreakpoints()
-
-function handleProblemClick(problemId: string) {
-  emit("problem-click", problemId)
-}
-</script>
-
-<template>
-  <div>
-    <n-grid :cols="isDesktop ? 4 : 1" :x-gap="16" :y-gap="16">
-      <n-grid-item v-for="(problemSetProblem, index) in problems" :key="problemSetProblem.id">
-        <n-card
-          hoverable
-          @click="handleProblemClick(problemSetProblem.problem._id)"
-          style="cursor: pointer"
-        >
-          <n-flex align="center">
-            <Icon
-              style="margin-right: 10px"
-              width="48"
-              icon="fluent-emoji:check-mark-button"
-              v-if="problemSetProblem.isCompleted"
-            />
-
-            <n-flex vertical style="flex: 1">
-              <n-flex align="center">
-                <n-h4 style="margin: 0">#{{ index + 1 }}</n-h4>
-                <n-h4 style="margin: 0">
-                  {{ problemSetProblem.problem.title }}
-                </n-h4>
-              </n-flex>
-
-              <n-flex align="center" size="small">
-                <n-tag
-                  v-if="problemSetProblem.problem.difficulty"
-                  :type="getTagColor(problemSetProblem.problem.difficulty)"
-                  size="small"
-                >
-                  {{ DIFFICULTY[problemSetProblem.problem.difficulty] }}
-                </n-tag>
-                <n-text type="info">分数：{{ problemSetProblem.score }}</n-text>
-                <n-text v-if="!problemSetProblem.isRequired">（选做）</n-text>
-              </n-flex>
-            </n-flex>
-          </n-flex>
-        </n-card>
-      </n-grid-item>
-    </n-grid>
-    <div class="tip">
-      <n-text depth="3">题目完成后会自动返回题单页面</n-text>
-    </div>
-  </div>
-</template>
-
-<style scoped>
-.tip {
-  padding-top: 24px;
-  text-align: center;
-}
-</style>
@@ -1,267 +0,0 @@
-<script setup lang="ts">
-import { errorMessage } from "utils/api"
-import { h, computed, ref, onMounted, watch } from "vue"
-import { watchDebounced } from "@vueuse/core"
-import { parseTime } from "utils/functions"
-import type { ProblemSetProgress } from "utils/types"
-import { getProblemSetUserProgress } from "../../api"
-import { NFlex, NTag } from "naive-ui"
-import { usePagination } from "shared/composables/pagination"
-import Pagination from "shared/components/Pagination.vue"
-
-const route = useRoute()
-const message = useMessage()
-const problemSetId = computed(() => Number(route.params.problemSetId))
-const progress = ref<ProblemSetProgress[]>([])
-const loading = ref(false)
-const total = ref(0)
-const statistics = ref<{
-  total: number
-  completed: number
-  avgProgress: number
-} | null>(null)
-const classFilter = ref<string>("")
-const completionFilter = ref<"" | "completed" | "in_progress" | "not_started">("")
-const allProblems = ref<Array<{ id: number; _id: string; title: string }>>([])
-
-// 完成度筛选选项
-const completionOptions = [
-  { label: "全部", value: "" },
-  { label: "未开始", value: "not_started" },
-  { label: "进行中", value: "in_progress" },
-  { label: "已完成", value: "completed" },
-]
-
-// 使用分页 composable
-const { query } = usePagination({}, { defaultLimit: 50 })
-
-// 加载用户进度数据
-async function loadUserProgress() {
-  loading.value = true
-  const offset = (query.page - 1) * query.limit
-  const params: {
-    limit?: number
-    offset?: number
-    className?: string
-    completionStatus?: "" | "completed" | "in_progress" | "not_started"
-  } = {
-    limit: query.limit,
-    offset,
-  }
-  if (classFilter.value.trim()) {
-    params.className = classFilter.value.trim()
-  }
-  if (completionFilter.value) {
-    params.completionStatus = completionFilter.value
-  }
-  try {
-    const res = await getProblemSetUserProgress(problemSetId.value, params)
-
-    progress.value = res.results
-    total.value = res.total
-    // 使用后端返回的统计数据（基于所有数据）
-    if (res.statistics) {
-      statistics.value = res.statistics
-    }
-    // 保存所有题目信息
-    if (res.problems) {
-      allProblems.value = res.problems
-    }
-  } catch (err) {
-    // finally 里收掉 loading：以前 loading.value = false 写在 await 之后，
-    // 请求一失败（403、断网）转圈就永远停不下来
-    message.error("加载用户进度失败：" + errorMessage(err, "未知错误"))
-  } finally {
-    loading.value = false
-  }
-}
-
-// 监听分页参数变化
-watch([() => query.page, () => query.limit], loadUserProgress)
-// 监听班级过滤变化（防抖）
-watchDebounced(
-  classFilter,
-  () => {
-    query.page = 1 // 重置到第一页
-    loadUserProgress()
-  },
-  { debounce: 500 },
-)
-// 监听完成度筛选变化
-watch(completionFilter, () => {
-  query.page = 1 // 重置到第一页
-  loadUserProgress()
-})
-
-// 使用后端返回的统计数据
-const stats = computed(() => {
-  if (statistics.value) {
-    return {
-      total: statistics.value.total,
-      completed: statistics.value.completed,
-      avgProgress: Math.round(statistics.value.avgProgress),
-    }
-  }
-  // 如果后端还没有返回统计数据，使用默认值
-  return {
-    total: total.value,
-    completed: 0,
-    avgProgress: 0,
-  }
-})
-
-onMounted(loadUserProgress)
-
-// 定义表格列
-const progressColumns = [
-  {
-    title: "排名",
-    key: "rank",
-    width: 80,
-    render: (_row: ProblemSetProgress, index: number) => {
-      // 计算全局排名：当前页偏移 + 当前行索引 + 1
-      const globalRank = (query.page - 1) * query.limit + index + 1
-      return globalRank
-    },
-  },
-  {
-    title: "用户",
-    key: "user.username",
-    width: 120,
-    render: (row: ProblemSetProgress) => row.user.username,
-  },
-  {
-    title: "加入时间",
-    key: "join_time",
-    width: 180,
-    render: (row: ProblemSetProgress) => parseTime(row.joinTime, "YYYY-MM-DD HH:mm:ss"),
-  },
-  {
-    title: "已完成数量",
-    key: "completedProblemsCount",
-    width: 100,
-  },
-  {
-    title: "已/未完成题目",
-    key: "completed_problems",
-    width: 300,
-    render: (row: ProblemSetProgress) => {
-      if (row.progressPercentage === 100) {
-        return "全部题目已完成"
-      }
-      if (row.progressPercentage > 50 && row.progressPercentage < 100) {
-        const completedProblemIds = new Set(row.completedProblems.map((p: any) => p.id))
-        const incompleteProblems = allProblems.value.filter((p) => !completedProblemIds.has(p.id))
-        return h("div", { style: "max-height: 120px; overflow-y: auto" }, [
-          h(NFlex, {}, () =>
-            incompleteProblems.map((problem) =>
-              h(
-                NTag,
-                { type: "warning", size: "small", style: "margin: 2px" },
-                () => `${problem._id}: ${problem.title}`,
-              ),
-            ),
-          ),
-        ])
-      }
-      return h("div", { style: "max-height: 120px; overflow-y: auto" }, [
-        h(NFlex, {}, () =>
-          row.completedProblems.map((problem: any) =>
-            h(
-              NTag,
-              {
-                type: "success",
-                size: "small",
-                style: "margin: 2px",
-              },
-              () => `${problem._id}: ${problem.title}`,
-            ),
-          ),
-        ),
-      ])
-    },
-  },
-  {
-    title: "进度",
-    key: "progress_percentage",
-    width: 120,
-    render: (row: ProblemSetProgress) => {
-      return `${row.progressPercentage.toFixed(0)}%`
-    },
-  },
-  {
-    title: "状态",
-    key: "is_completed",
-    width: 100,
-    render: (row: ProblemSetProgress) => {
-      if (row.isCompleted) {
-        return h(NTag, { type: "success" }, () => "已完成")
-      } else {
-        return h(NTag, { type: "warning" }, () => "进行中")
-      }
-    },
-  },
-]
-</script>
-
-<template>
-  <div>
-    <!-- 过滤条件 -->
-    <n-form label-placement="left" inline>
-      <n-form-item label="班级">
-        <n-input
-          v-model:value="classFilter"
-          placeholder="输入班级名称"
-          style="width: 200px"
-          clearable
-        />
-      </n-form-item>
-
-      <n-form-item label="完成度：">
-        <n-select
-          v-model:value="completionFilter"
-          :options="completionOptions"
-          placeholder="完成度"
-          style="width: 160px"
-          clearable
-        />
-      </n-form-item>
-    </n-form>
-
-    <!-- 统计信息卡片 -->
-    <n-grid :cols="3" :x-gap="16" style="margin-bottom: 16px">
-      <n-grid-item>
-        <n-card size="small">
-          <n-statistic label="总参与人数" :value="stats.total" />
-        </n-card>
-      </n-grid-item>
-      <n-grid-item>
-        <n-card size="small">
-          <n-statistic label="已完成人数" :value="stats.completed" />
-        </n-card>
-      </n-grid-item>
-      <n-grid-item>
-        <n-card size="small">
-          <n-statistic label="平均进度" :value="stats.avgProgress.toFixed(0) + '%'" />
-        </n-card>
-      </n-grid-item>
-    </n-grid>
-
-    <n-data-table
-      :loading="loading"
-      :columns="progressColumns"
-      :data="progress"
-      :pagination="false"
-      :bordered="false"
-      :single-line="false"
-    />
-
-    <Pagination
-      :total="total"
-      :limit="query.limit"
-      :page="query.page"
-      @update:limit="(limit: number) => (query.limit = limit)"
-      @update:page="(page: number) => (query.page = page)"
-    />
-  </div>
-</template>
@@ -1,130 +1,637 @@
 <script setup lang="ts">
+import { useRouteQuery } from "@vueuse/router"
+import { useThemeVars } from "naive-ui"
+import { getProblemSetDetail, getProblemSetProblems, joinProblemSet } from "oj/api"
+import { useTone } from "oj/submission/composables/tone"
 import { errorMessage } from "utils/api"
-import { getProblemSetDetail, getProblemSetProblems, joinProblemSet, getUserBadges } from "../api"
-import type { ProblemSet, ProblemSetProblem, UserBadge as UserBadgeType } from "utils/types"
-import { useFireworks } from "../problem/composables/useFireworks"
-import ProblemSetHeader from "./components/ProblemSetHeader.vue"
-import ProblemSetProblemsList from "./components/ProblemSetProblemsList.vue"
-import UserProgressView from "./components/UserProgressView.vue"
+import { parseTime } from "utils/functions"
+import type { ProblemSet, ProblemSetProblem } from "utils/types"
+import { useAuthModalStore } from "shared/store/authModal"
 import { useUserStore } from "shared/store/user"
+import { useFireworks } from "../problem/composables/useFireworks"
+import BadgeLadder from "./components/BadgeLadder.vue"
+import ClassView from "./components/ClassView.vue"

+/**
+ * 题单详情（设计稿「题单重设计」详情 B）：顶上一条是进度和奖章阶梯，下面题目分两列。
+ *
+ * - 还没加入：题目看得见、点不进去，右边一个大按钮「加入题单，开始做」。加入是用户要留的
+ *   一步（「只是打开就算加入的话，会有疑惑的」），所以这里要让人一眼看懂为什么要点。
+ * - 布置期内以前做对过的题标「以前做对过 · 旧代码先藏着」，规则见后端 problemSetLockCutoffs。
+ * - 做完了：整条变绿，写几点做完、用了多久。烟花只在做完的那一刻放（做对最后一道、
+ *   1.5 秒后跳回来的那一下），以后再打开不放。
+ * - 老师多一个「全班情况」页签。
+ */
 const route = useRoute()
 const router = useRouter()
 const message = useMessage()
-
-const { celebrate } = useFireworks()
+const theme = useThemeVars()
+const tone = useTone()
 const userStore = useUserStore()
+const authStore = useAuthModalStore()
+const { celebrate } = useFireworks()

-const problemSetId = computed(() => Number(route.params.problemSetId))
-
-const problemSet = ref<ProblemSet | null>(null)
+const id = computed(() => Number(route.params.problemSetId))
+const set = ref<ProblemSet | null>(null)
 const problems = ref<ProblemSetProblem[]>([])
-const isJoined = ref(false)
-const isJoining = ref(false)
-const userBadges = ref<UserBadgeType[]>([])
-const activeTab = ref("problems")
+const missing = ref(false)
+const joining = ref(false)
+const tab = useRouteQuery<string>("tab", "problems")

-async function loadProblemSetDetail() {
-  const res = await getProblemSetDetail(problemSetId.value)
-  problemSet.value = res
-  isJoined.value = res.userProgress?.isJoined || false
-}
-
-async function loadProblems() {
-  const res = await getProblemSetProblems(problemSetId.value)
-  problems.value = res
-}
-
-async function loadUserBadges() {
-  if (!isJoined.value) return
-
-  const res = await getUserBadges()
-  userBadges.value = res.filter(
-    (badge: UserBadgeType) => badge.badge.problemSetId === problemSetId.value,
-  )
-}
-
-async function init() {
-  await Promise.all([loadProblemSetDetail(), loadProblems()])
-  if (isJoined.value) {
-    if (problemSet.value?.userProgress?.isCompleted) {
-      celebrate()
-    }
-    loadUserBadges()
-  }
-}
-
-async function handleProblemClick(problemId: string) {
-  if (!userStore.isAuthed) {
-    message.warning("请先登录！")
-    return
-  }
-  if (!isJoined.value) {
-    message.warning("请先点击【加入题单】按钮！")
-    return
-  }
-  router.push({
-    name: "problemset problem",
-    params: {
-      problemSetId: problemSetId.value,
-      problemID: problemId,
-    },
-  })
-}
-
-async function handleJoinProblemSet() {
-  if (isJoining.value) return
-
-  isJoining.value = true
+async function load() {
+  missing.value = false
  try {
-    await joinProblemSet(problemSetId.value)
-    isJoined.value = true
-    message.success("成功加入题单！")
-    // 加入题单后加载用户徽章
-    await loadUserBadges()
-  } catch (err) {
-    message.error("加入题单失败：" + errorMessage(err, "未知错误"))
-  } finally {
-    isJoining.value = false
+    const [detail, list] = await Promise.all([
+      getProblemSetDetail(id.value),
+      getProblemSetProblems(id.value),
+    ])
+    set.value = detail
+    problems.value = list
+  } catch {
+    missing.value = true
+    return
+  }
+  const done = set.value.userProgress.completeTime
+  if (set.value.userProgress.isCompleted && done && Date.now() - Date.parse(done) < 60_000) {
+    celebrate()
  }
 }

-// 「用户进度」那一栏调的是 requireTeacher 的接口（Teacher Admin | Super Admin），
-// 所以这里的条件必须跟它一致。以前写的是「超管 或 自己完成了题单」，两边正好错开：
-// 学生做完题单会看到这一栏、点进去 403；而真正该用它的 Teacher Admin 反倒看不到。
-const showTabs = computed(() => userStore.isTeacherOrAbove)
+watch(id, load)
+onMounted(load)

-onMounted(init)
+const progress = computed(() => set.value?.userProgress)
+const joined = computed(() => !!progress.value?.isJoined)
+/** 老师不用加入也能点进题目去看（不记进度），也不给他摆「加入」按钮 */
+const canOpen = computed(() => joined.value || userStore.isTeacherOrAbove)
+const optional = computed(() => (set.value ? set.value.problemsCount - set.value.requiredCount : 0))
+const percent = computed(() =>
+  set.value && progress.value?.isJoined && set.value.requiredCount
+    ? Math.min(100, (progress.value.completedCount / set.value.requiredCount) * 100)
+    : 0,
+)
+const hiddenCount = computed(() => problems.value.filter((item) => item.oldCodeHidden).length)
+
+/** 做完用了多久：从加入到做完 */
+const spent = computed(() => {
+  const p = progress.value
+  if (!p?.joinTime || !p.completeTime) return ""
+  const minutes = Math.round((Date.parse(p.completeTime) - Date.parse(p.joinTime)) / 60_000)
+  if (minutes < 60) return `${Math.max(1, minutes)} 分钟`
+  if (minutes < 24 * 60) return `${Math.round(minutes / 60)} 小时`
+  return `${Math.round(minutes / 1440)} 天`
+})
+
+const columns = computed(() => {
+  const half = Math.ceil(problems.value.length / 2)
+  return [problems.value.slice(0, half), problems.value.slice(half)].filter((col) => col.length)
+})
+
+function indexOf(item: ProblemSetProblem) {
+  return problems.value.indexOf(item) + 1
+}
+
+function solvedAt(time: string) {
+  const today = parseTime(new Date(), "YYYY-MM-DD") === parseTime(time, "YYYY-MM-DD")
+  return parseTime(time, today ? "HH:mm" : "M月D日")
+}
+
+function problemLink(item: ProblemSetProblem) {
+  return {
+    name: "problemset problem",
+    params: { problemSetId: id.value, problemID: item.problem._id },
+  }
+}
+
+async function join() {
+  if (!userStore.isAuthed) {
+    authStore.openLoginModal()
+    return
+  }
+  if (joining.value) return
+  joining.value = true
+  try {
+    await joinProblemSet(id.value)
+    message.success("加入了，现在开始在这里做对的题都会记进度")
+    await load()
+  } catch (err) {
+    message.error(errorMessage(err, "加入失败"))
+  } finally {
+    joining.value = false
+  }
+}
+
+/** 编辑只给出题人和超管（后台按归属校验，别人点进去是 404） */
+const canEdit = computed(
+  () => !!set.value && (userStore.isSuperAdmin || set.value.createdBy.id === userStore.user?.id),
+)
+
+const info = computed(() => tone("info"))
+const success = computed(() => tone("success"))
+const warning = computed(() => tone("warning"))
+const purple = { color: "#5b3fa8", background: "rgba(122, 95, 208, 0.12)" }
 </script>

 <template>
-  <div v-if="problemSet">
-    <ProblemSetHeader
-      :problem-set="problemSet"
-      :is-joined="isJoined"
-      :is-joining="isJoining"
-      :user-badges="userBadges"
-      @join="handleJoinProblemSet"
-    />
-    <n-tabs v-if="showTabs" v-model:value="activeTab" animated>
-      <n-tab-pane name="problems" tab="题目列表">
-        <ProblemSetProblemsList
-          :problems="problems"
-          :is-joined="isJoined"
-          @problem-click="handleProblemClick"
-        />
-      </n-tab-pane>
-      <n-tab-pane name="progress" tab="用户进度">
-        <UserProgressView />
-      </n-tab-pane>
-    </n-tabs>
-    <ProblemSetProblemsList
-      v-else
-      :problems="problems"
-      :is-joined="isJoined"
-      @problem-click="handleProblemClick"
-    />
+  <n-result
+    v-if="missing"
+    status="404"
+    title="题单不存在"
+    description="可能还没公开，或者已经删掉了"
+  >
+    <template #footer>
+      <n-button @click="router.push({ name: 'problemsets' })">回到题单列表</n-button>
+    </template>
+  </n-result>
+
+  <div v-else-if="set" class="page">
+    <section class="band" :class="{ done: progress?.isCompleted }">
+      <span v-if="progress?.isCompleted" class="done-mark" aria-hidden="true">✓</span>
+      <div class="head">
+        <div class="row">
+          <router-link :to="{ name: 'problemsets' }" class="muted back">‹ 题单</router-link>
+          <h2 class="ell">{{ set.title }}</h2>
+          <span v-if="set.assigning" class="pill assign"
+            >布置到 {{ parseTime(set.assignedUntil!, "M月D日") }}</span
+          >
+        </div>
+        <template v-if="progress?.isCompleted">
+          <div class="done-text">
+            <b>全部做完了</b> · {{ parseTime(progress.completeTime!, "M月D日 HH:mm") }}
+            <template v-if="spent">，加入后用了 {{ spent }}</template>
+          </div>
+        </template>
+        <template v-else-if="joined">
+          <div class="row baseline">
+            <span class="muted small">做对</span>
+            <span class="num count">{{ progress!.completedCount }}</span>
+            <span class="muted num">/ {{ set.requiredCount }} 道</span>
+            <span class="muted tiny gap">
+              <template v-if="optional > 0">另有 {{ optional }} 道选做 · </template>
+              {{ parseTime(progress!.joinTime!, "M月D日 HH:mm") }} 加入
+            </span>
+          </div>
+          <div class="bar"><div class="fill" :style="{ width: `${percent}%` }"></div></div>
+        </template>
+        <div v-else class="muted small">
+          {{ set.createdBy.username }} 出的 · {{ set.problemsCount }} 道<template
+            v-if="optional > 0"
+            >，{{ optional }} 道选做</template
+          ><template v-else>，全部必做</template>
+          <template v-if="!set.badges.length"> · 这个题单没有奖章</template>
+        </div>
+        <div v-if="set.description && set.description !== set.title" class="sec small desc">
+          {{ set.description }}
+        </div>
+      </div>
+      <template v-if="set.badges.length">
+        <span class="divider"></span>
+        <div class="ladder-box"><BadgeLadder :set="set" /></div>
+      </template>
+      <div class="spacer"></div>
+      <div v-if="!joined && !userStore.isTeacherOrAbove" class="join">
+        <n-button type="primary" size="large" :loading="joining" @click="join">
+          加入题单，开始做
+        </n-button>
+        <span class="muted tiny">加入以后，在题单里做对的题才算进度</span>
+      </div>
+    </section>
+
+    <div v-if="!joined && hiddenCount" class="notice" :style="purple">
+      <svg
+        class="lock"
+        width="12"
+        height="12"
+        viewBox="0 0 24 24"
+        fill="none"
+        stroke="currentColor"
+        stroke-width="2.2"
+        stroke-linecap="round"
+        stroke-linejoin="round"
+        aria-hidden="true"
+      >
+        <rect x="5" y="11" width="14" height="9" rx="2" />
+        <path d="M8 11V8a4 4 0 0 1 8 0v3" />
+      </svg>
+      其中 <b>{{ hiddenCount }}</b> 道你以前做对过。布置期内（到
+      {{
+        parseTime(set.assignedUntil!, "M月D日")
+      }}）这几道的旧代码先藏起来，在题单里重新做对就能看。
+    </div>
+
+    <div v-if="userStore.isTeacherOrAbove" class="tabs">
+      <button class="seg" :class="{ on: tab !== 'class' }" @click="tab = 'problems'">题目</button>
+      <button class="seg" :class="{ on: tab === 'class' }" @click="tab = 'class'">全班情况</button>
+      <div class="spacer"></div>
+      <n-button
+        v-if="canEdit"
+        size="small"
+        @click="router.push({ name: 'admin problemset edit', params: { problemSetId: set.id } })"
+      >
+        编辑题单
+      </n-button>
+    </div>
+
+    <ClassView v-if="userStore.isTeacherOrAbove && tab === 'class'" :problem-set-id="set.id" />
+
+    <template v-else>
+      <div v-if="problems.length" class="cols">
+        <section v-for="(col, ci) in columns" :key="ci" class="card list">
+          <component
+            :is="canOpen ? 'router-link' : 'div'"
+            v-for="item in col"
+            :key="item.id"
+            :to="canOpen ? problemLink(item) : undefined"
+            class="prow"
+            :class="{ off: !canOpen }"
+          >
+            <span v-if="item.isCompleted" class="dot done-dot">✓</span>
+            <span v-else-if="item.wrongCount" class="dot tried-dot">!</span>
+            <span v-else class="dot empty-dot"></span>
+            <span class="muted num idx">{{ indexOf(item) }}</span>
+            <span class="ell ptitle">{{ item.problem.title }}</span>
+            <span v-if="!item.isRequired" class="opt">选做</span>
+            <span v-if="item.oldCodeHidden" class="old" :style="purple"
+              ><svg
+                class="lock"
+                width="12"
+                height="12"
+                viewBox="0 0 24 24"
+                fill="none"
+                stroke="currentColor"
+                stroke-width="2.2"
+                stroke-linecap="round"
+                stroke-linejoin="round"
+                aria-hidden="true"
+              >
+                <rect x="5" y="11" width="14" height="9" rx="2" />
+                <path d="M8 11V8a4 4 0 0 1 8 0v3" /></svg
+              >以前做对过 · 旧代码先藏着</span
+            >
+            <div class="spacer"></div>
+            <span v-if="item.isCompleted && item.solvedTime" class="muted num tiny"
+              >{{ solvedAt(item.solvedTime) }} 做对</span
+            >
+            <span v-else-if="item.wrongCount && joined" class="tiny tried"
+              >交过 {{ item.wrongCount }} 次</span
+            >
+            <span v-else-if="canOpen" class="go">去做 ›</span>
+          </component>
+        </section>
+      </div>
+      <n-empty v-else description="这个题单还没有题目" />
+      <div v-if="joined && problems.length" class="muted tiny foot">做对一道会自动回到这里</div>
+    </template>
  </div>
 </template>

-<style scoped></style>
+<style scoped>
+.page {
+  display: flex;
+  flex-direction: column;
+  gap: 12px;
+}
+
+.band {
+  box-sizing: border-box;
+  padding: 14px 20px 12px;
+  display: flex;
+  align-items: center;
+  flex-wrap: wrap;
+  gap: 16px 24px;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+}
+
+.band.done {
+  background: v-bind("success.background");
+  border-color: transparent;
+}
+
+.done-mark {
+  width: 48px;
+  height: 48px;
+  border-radius: 50%;
+  flex-shrink: 0;
+  background: v-bind("theme.successColor");
+  color: #ffffff;
+  font-size: 24px;
+  font-weight: 700;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.done-text {
+  font-size: 14px;
+  color: v-bind("success.color");
+}
+
+.head {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  width: 380px;
+  max-width: 100%;
+  min-width: 0;
+}
+
+.head h2 {
+  margin: 0;
+  font-size: 20px;
+}
+
+.desc {
+  line-height: 1.5;
+}
+
+.row {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  min-width: 0;
+}
+
+.row.baseline {
+  align-items: baseline;
+  gap: 6px;
+}
+
+.back {
+  flex-shrink: 0;
+  font-size: 13px;
+  text-decoration: none;
+}
+
+.count {
+  font-size: 24px;
+  font-weight: 700;
+}
+
+.gap {
+  margin-left: 6px;
+}
+
+.bar {
+  height: 8px;
+  border-radius: 4px;
+  background: v-bind("theme.actionColor");
+  overflow: hidden;
+}
+
+.fill {
+  height: 100%;
+  background: v-bind("theme.successColor");
+}
+
+.divider {
+  width: 1px;
+  align-self: stretch;
+  background: v-bind("theme.dividerColor");
+}
+
+.ladder-box {
+  max-width: 100%;
+  overflow-x: auto;
+}
+
+.join {
+  display: flex;
+  flex-direction: column;
+  align-items: flex-end;
+  gap: 6px;
+}
+
+.lock {
+  flex-shrink: 0;
+  vertical-align: -1px;
+}
+
+.old .lock {
+  margin-right: 3px;
+}
+
+.notice {
+  box-sizing: border-box;
+  padding: 10px 14px;
+  border-radius: 6px;
+  font-size: 13px;
+}
+
+.tabs {
+  display: flex;
+  align-items: center;
+}
+
+.seg {
+  height: 30px;
+  padding: 0 14px;
+  border: 1px solid v-bind("theme.borderColor");
+  background: transparent;
+  font: inherit;
+  font-size: 13px;
+  color: v-bind("theme.textColor2");
+  cursor: pointer;
+}
+
+.seg:first-child {
+  border-radius: 4px 0 0 4px;
+}
+
+.seg + .seg {
+  border-left: none;
+  border-radius: 0 4px 4px 0;
+}
+
+.seg.on {
+  color: v-bind("success.color");
+  background: v-bind("success.background");
+  font-weight: 600;
+}
+
+.cols {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
+  gap: 12px;
+  align-items: start;
+}
+
+.card {
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+  overflow: hidden;
+}
+
+.list {
+  display: flex;
+  flex-direction: column;
+}
+
+.prow {
+  height: 40px;
+  flex-shrink: 0;
+  box-sizing: border-box;
+  padding: 0 16px;
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  border-bottom: 1px solid v-bind("theme.dividerColor");
+  color: v-bind("theme.textColor1");
+  text-decoration: none;
+}
+
+.prow:last-child {
+  border-bottom: none;
+}
+
+a.prow:hover {
+  background: v-bind("theme.hoverColor");
+}
+
+.prow.off {
+  color: v-bind("theme.textColor3");
+}
+
+.dot {
+  width: 22px;
+  height: 22px;
+  border-radius: 50%;
+  flex-shrink: 0;
+  box-sizing: border-box;
+  display: inline-flex;
+  align-items: center;
+  justify-content: center;
+  font-size: 12px;
+  font-weight: 700;
+}
+
+.done-dot {
+  background: v-bind("theme.successColor");
+  color: #ffffff;
+}
+
+.tried-dot {
+  background: v-bind("warning.background");
+  color: v-bind("warning.color");
+}
+
+.empty-dot {
+  border: 1.5px dashed v-bind("theme.borderColor");
+}
+
+.idx {
+  width: 20px;
+  text-align: right;
+  font-size: 13px;
+  flex-shrink: 0;
+}
+
+.ptitle {
+  font-size: 14px;
+}
+
+.opt {
+  height: 20px;
+  padding: 0 6px;
+  border-radius: 3px;
+  font-size: 12px;
+  border: 1px solid v-bind("theme.borderColor");
+  color: v-bind("theme.textColor3");
+  display: inline-flex;
+  align-items: center;
+  flex-shrink: 0;
+}
+
+.old {
+  height: 20px;
+  padding: 0 6px;
+  border-radius: 3px;
+  font-size: 12px;
+  display: inline-flex;
+  align-items: center;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.tried {
+  color: v-bind("warning.color");
+}
+
+.go {
+  font-size: 13px;
+  color: v-bind("theme.primaryColor");
+  flex-shrink: 0;
+}
+
+.foot {
+  text-align: center;
+}
+
+.pill {
+  height: 22px;
+  padding: 0 8px;
+  border-radius: 3px;
+  font-size: 12px;
+  display: inline-flex;
+  align-items: center;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.assign {
+  color: v-bind("info.color");
+  background: v-bind("info.background");
+}
+
+.spacer {
+  flex-grow: 1;
+}
+
+.muted {
+  color: v-bind("theme.textColor3");
+}
+
+.sec {
+  color: v-bind("theme.textColor2");
+}
+
+.small {
+  font-size: 13px;
+}
+
+.tiny {
+  font-size: 12px;
+}
+
+.num {
+  font-variant-numeric: tabular-nums;
+}
+
+.ell {
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+@media (max-width: 640px) {
+  .cols {
+    grid-template-columns: minmax(0, 1fr);
+  }
+
+  .head {
+    width: 100%;
+  }
+
+  .divider {
+    display: none;
+  }
+
+  .join {
+    align-items: stretch;
+    width: 100%;
+  }
+}
+</style>
@@ -1,263 +1,404 @@
 <script setup lang="ts">
-import { useRouteQuery } from "@vueuse/router"
-import { getProblemSetList } from "../api"
+import { useThemeVars } from "naive-ui"
+import { getProblemSetList } from "oj/api"
+import { rgba, useTone } from "oj/submission/composables/tone"
+import { parseTime } from "utils/functions"
 import type { ProblemSet } from "utils/types"
-import Pagination from "shared/components/Pagination.vue"
-import { usePagination } from "shared/composables/pagination"
+import { badgeCondition, ladder, nextBadge } from "./badges"

+/**
+ * 题单列表（设计稿「题单重设计」列表 A）：老师正在布置的题单单独一排大卡片 —— 做对几道、
+ * 布置到哪天、再做对几道拿哪个奖章；其余题单一排排小卡片，加入过的在前。
+ *
+ * 题单一共十几个，一次全取回来在前端分组，不分页
+ */
 const router = useRouter()
+const theme = useThemeVars()
+const tone = useTone()

-const total = ref(0)
-const problemSets = ref<ProblemSet[]>([])
+const sets = ref<ProblemSet[]>([])
+const loaded = ref(false)
+const keyword = ref("")

-interface ProblemSetQuery {
-  keyword: string
-}
-
-// 使用分页 composable
-const { query, clearQuery } = usePagination<ProblemSetQuery>(
-  {
-    keyword: useRouteQuery("keyword", "").value,
-  },
-  {
-    defaultLimit: 30,
-  },
-)
-
-async function listProblemSets() {
-  if (query.page < 1) query.page = 1
-  const offset = (query.page - 1) * query.limit
-  const res = await getProblemSetList(offset, query.limit, query.keyword)
-  total.value = res.total
-  problemSets.value = res.results
-}
-
-function getDifficultyTag(difficulty: string) {
-  const difficultyMap: Record<
-    string,
-    { type: "success" | "warning" | "error" | "default"; text: string }
-  > = {
-    Easy: { type: "success", text: "简单" },
-    Medium: { type: "warning", text: "中等" },
-    Hard: { type: "error", text: "困难" },
+onMounted(async () => {
+  try {
+    sets.value = (await getProblemSetList(0, 250)).results
+  } finally {
+    loaded.value = true
  }
-  return difficultyMap[difficulty] || { type: "default", text: "未知" }
-}
-
-function goToProblemSet(problemSetId: number) {
-  router.push(`/problemset/${problemSetId}`)
-}
-
-function getConditionText(conditionType: string, conditionValue: number): string {
-  const conditionMap: Record<string, string> = {
-    all_problems: "完成所有题目",
-    problem_count: `完成 ${conditionValue} 道题目`,
-    score: `达到 ${conditionValue} 分`,
-  }
-  return conditionMap[conditionType] || "未知条件"
-}
-
-onMounted(listProblemSets)
-
-// 监听搜索关键词变化（防抖）
-watchDebounced(() => query.keyword, listProblemSets, {
-  debounce: 500,
-  maxWait: 1000,
 })

-// 监听其他查询条件变化
-watch(() => [query.page, query.limit], listProblemSets)
+const shown = computed(() => {
+  const word = keyword.value.trim().toLowerCase()
+  if (!word) return sets.value
+  return sets.value.filter(
+    (set) => set.title.toLowerCase().includes(word) || set.description.toLowerCase().includes(word),
+  )
+})
+
+/** 布置中的：快到期的在前 */
+const assigning = computed(() =>
+  shown.value
+    .filter((set) => set.assigning)
+    .sort((a, b) => Date.parse(a.assignedUntil!) - Date.parse(b.assignedUntil!)),
+)
+
+/** 其他：加入过的在前（最近加入的最前），再按新建排 */
+const others = computed(() =>
+  shown.value
+    .filter((set) => !set.assigning)
+    .sort((a, b) => {
+      const ja = a.userProgress.joinTime
+      const jb = b.userProgress.joinTime
+      if (ja && jb) return Date.parse(jb) - Date.parse(ja)
+      if (ja || jb) return ja ? -1 : 1
+      return Date.parse(b.createTime) - Date.parse(a.createTime)
+    }),
+)
+const joinedOthers = computed(() => others.value.filter((set) => set.userProgress.isJoined).length)
+
+function description(set: ProblemSet) {
+  // 简介大多就是把标题再抄一遍，一样的就不重复显示
+  return set.description && set.description !== set.title ? set.description : ""
+}
+
+function optional(set: ProblemSet) {
+  return set.problemsCount - set.requiredCount
+}
+
+function percent(set: ProblemSet) {
+  const progress = set.userProgress
+  return progress.isJoined && set.requiredCount
+    ? Math.min(100, (progress.completedCount / set.requiredCount) * 100)
+    : 0
+}
+
+function open(set: ProblemSet) {
+  router.push({ name: "problemset", params: { problemSetId: set.id } })
+}
+
+const info = computed(() => tone("info"))
+const success = computed(() => tone("success"))
+// 做完的卡片只淡淡地染一点绿（设计稿），用 success.background 那一档太抢眼
+const doneBackground = computed(() => rgba(theme.value.successColor, 0.05))
 </script>

 <template>
-  <n-flex vertical size="large">
-    <!-- 难度和状态两个筛选器撤了：线上 16 个题单全是 Easy / active，选「中等」「困难」
-         「已归档」永远是空列表。接口那两个 query 参数还在，哪天真的用起这两个字段，
-         把 select 加回来即可。 -->
-    <n-space>
-      <n-input
-        v-model:value="query.keyword"
-        placeholder="搜索题单..."
-        clearable
-        @clear="clearQuery"
-        style="width: 200px"
-      />
-    </n-space>
-
-    <div v-if="problemSets.length > 0" class="set-grid">
-      <div
-        v-for="problemSet in problemSets"
-        :key="problemSet.id"
-        class="set-card"
-        :class="{ completed: problemSet.userProgress?.isCompleted }"
-        @click="goToProblemSet(problemSet.id)"
-      >
-        <n-flex justify="space-between" align="center" :wrap="false" :size="8">
-          <span class="set-title">{{ problemSet.title }}</span>
-          <n-tag v-if="problemSet.userProgress?.isCompleted" type="success" size="small" round>
-            已完成
-          </n-tag>
-          <n-tag v-else-if="problemSet.userProgress?.isJoined" type="info" size="small" round>
-            进行中
-          </n-tag>
-        </n-flex>
-
-        <!-- 简介大多就是把标题再抄一遍，一样的就不重复显示 -->
-        <n-text
-          v-if="problemSet.description && problemSet.description !== problemSet.title"
-          depth="3"
-          class="set-desc"
-        >
-          {{ problemSet.description }}
-        </n-text>
-
-        <div class="set-progress">
-          <n-flex justify="space-between" align="center" class="set-progress-text">
-            <n-text depth="3">
-              <!-- 进度是加入/完成时存下的快照，分母用快照自己的 totalCount：题单后来
-                   加了题的话，拿现在的 problemsCount 去除，就会出现「已完成」却是 5 / 6 -->
-              <template v-if="problemSet.userProgress?.isJoined">
-                已完成 {{ problemSet.userProgress.completedCount }} /
-                {{ problemSet.userProgress.totalCount }} 题
-                <template v-if="problemSet.problemsCount > problemSet.userProgress.totalCount">
-                  · 新加了
-                  {{ problemSet.problemsCount - problemSet.userProgress.totalCount }} 题
-                </template>
-              </template>
-              <template v-else>共 {{ problemSet.problemsCount }} 题 · 还没开始</template>
-            </n-text>
-            <!-- 线上题单全是简单难度，只有不是简单时才值得标出来 -->
-            <n-tag
-              v-if="problemSet.difficulty !== 'Easy'"
-              :type="getDifficultyTag(problemSet.difficulty).type"
-              size="small"
-              :bordered="false"
-            >
-              {{ getDifficultyTag(problemSet.difficulty).text }}
-            </n-tag>
-            <n-tag v-if="problemSet.status === 'archived'" size="small" :bordered="false">
-              已归档
-            </n-tag>
-          </n-flex>
-          <n-progress
-            type="line"
-            :percentage="Math.round(problemSet.userProgress?.progressPercentage ?? 0)"
-            :show-indicator="false"
-            :height="6"
-            status="success"
-          />
-        </div>
-
-        <n-flex v-if="problemSet.badges?.length" align="center" :size="6" class="set-badges">
-          <n-text depth="3" class="set-badges-label">
-            徽章 {{ problemSet.badges.filter((b) => b.isEarned).length }} /
-            {{ problemSet.badges.length }}
-          </n-text>
-          <n-tooltip v-for="badge in problemSet.badges" :key="badge.id" trigger="hover">
-            <template #trigger>
-              <n-image
-                :src="badge.icon"
-                :alt="badge.name"
-                width="24"
-                height="24"
-                object-fit="cover"
-                preview-disabled
-                :class="badge.isEarned ? 'earned-badge' : 'locked-badge'"
-              />
-            </template>
-            <n-flex vertical size="small">
-              <span style="font-weight: bold"> 徽章: {{ badge.name }} </span>
-              <span>
-                获取条件:
-                {{ getConditionText(badge.conditionType, badge.conditionValue) }}
-              </span>
-              <n-text type="primary" v-if="badge.isEarned"> ✓ 已获得 </n-text>
-            </n-flex>
-          </n-tooltip>
-        </n-flex>
-      </div>
+  <div class="page">
+    <div class="top">
+      <h2>题单</h2>
+      <div class="spacer"></div>
+      <n-input v-model:value="keyword" placeholder="搜题单" clearable class="search" />
    </div>

-    <Pagination
-      v-if="problemSets.length > 0"
-      :total="total"
-      v-model:limit="query.limit"
-      v-model:page="query.page"
+    <template v-if="assigning.length">
+      <div class="sect">
+        布置中<span class="muted">老师现在布置的 · {{ assigning.length }} 个</span>
+      </div>
+      <div class="big-grid">
+        <a
+          v-for="set in assigning"
+          :key="set.id"
+          :href="`/problemset/${set.id}`"
+          class="card big"
+          :class="{ done: set.userProgress.isCompleted }"
+          @click.prevent="open(set)"
+        >
+          <div class="row">
+            <b class="ell title">{{ set.title }}</b>
+            <span v-if="set.userProgress.isCompleted" class="pill done-pill">✓ 做完了</span>
+          </div>
+          <div class="muted ell desc">{{ description(set) }}</div>
+          <div class="row baseline">
+            <template v-if="set.userProgress.isJoined">
+              <span class="num count">{{ set.userProgress.completedCount }}</span>
+              <span class="muted num">/ {{ set.requiredCount }}</span>
+            </template>
+            <span v-else class="muted small">还没加入 · {{ set.requiredCount }} 道</span>
+            <span v-if="optional(set) > 0" class="muted tiny">另有 {{ optional(set) }} 道选做</span>
+            <div class="spacer"></div>
+            <span class="pill assign">布置到 {{ parseTime(set.assignedUntil!, "M月D日") }}</span>
+          </div>
+          <div class="bar"><div class="fill" :style="{ width: `${percent(set)}%` }"></div></div>
+          <div v-if="nextBadge(set)" class="row hint">
+            <img :src="nextBadge(set)!.badge.icon" alt="" class="icon locked" />
+            <span>
+              再做对 <b class="num">{{ nextBadge(set)!.left }}</b> 道拿「{{
+                nextBadge(set)!.badge.name
+              }}」
+            </span>
+          </div>
+          <div v-else-if="set.badges.length" class="row hint got">
+            <img
+              v-for="badge in ladder(set)"
+              :key="badge.id"
+              :src="badge.icon"
+              :alt="badge.name"
+              :title="badge.name"
+              class="icon"
+            />
+            <span>奖章全拿到了</span>
+          </div>
+          <div v-else class="muted hint">这个题单没有奖章</div>
+        </a>
+      </div>
+    </template>
+
+    <div v-if="others.length" class="sect">
+      {{ assigning.length ? "其他题单" : "题单" }}
+      <span class="muted"
+        >{{ others.length }} 个<template v-if="joinedOthers"> · 加入过的在前</template></span
+      >
+    </div>
+    <div class="small-grid">
+      <a
+        v-for="set in others"
+        :key="set.id"
+        :href="`/problemset/${set.id}`"
+        class="card small-card"
+        :class="{ done: set.userProgress.isCompleted }"
+        @click.prevent="open(set)"
+      >
+        <div class="row">
+          <b class="ell">{{ set.title }}</b>
+          <span v-if="set.userProgress.isCompleted" class="green tiny">✓</span>
+        </div>
+        <div class="row tiny">
+          <span v-if="set.userProgress.isJoined" class="num">
+            做对 <b>{{ set.userProgress.completedCount }}</b> / {{ set.requiredCount }}
+          </span>
+          <span v-else class="muted num"
+            >{{ set.problemsCount }} 道 · {{ set.joinedCount }} 人做过</span
+          >
+          <div class="spacer"></div>
+          <img
+            v-for="badge in ladder(set)"
+            :key="badge.id"
+            :src="badge.icon"
+            :alt="badge.name"
+            :title="`${badge.name} · ${badgeCondition(badge)}${badge.isEarned ? ' · 已拿到' : ''}`"
+            class="mini"
+            :class="{ locked: !badge.isEarned }"
+          />
+        </div>
+      </a>
+    </div>
+
+    <n-empty
+      v-if="loaded && !shown.length"
+      :description="keyword ? '没有找到这样的题单' : '还没有题单'"
    />
-  </n-flex>
-  <n-empty v-if="problemSets.length === 0"></n-empty>
+  </div>
 </template>

 <style scoped>
-.set-grid {
-  display: grid;
-  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
-  gap: 16px;
-}
-
-.set-card {
+.page {
  display: flex;
  flex-direction: column;
+  gap: 14px;
+}
+
+.top {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+}
+
+.top h2 {
+  margin: 0;
+  font-size: 20px;
+}
+
+.search {
+  width: 220px;
+}
+
+.spacer {
+  flex-grow: 1;
+}
+
+.sect {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  font-size: 13px;
+  font-weight: 700;
+  color: v-bind("theme.textColor2");
+}
+
+.sect .muted {
+  font-weight: 400;
+}
+
+.muted {
+  color: v-bind("theme.textColor3");
+}
+
+.green {
+  color: v-bind("success.color");
+}
+
+.small {
+  font-size: 13px;
+}
+
+.tiny {
+  font-size: 12px;
+}
+
+.num {
+  font-variant-numeric: tabular-nums;
+}
+
+.ell {
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.row {
+  display: flex;
+  align-items: center;
+  gap: 8px;
+  min-width: 0;
+}
+
+.row.baseline {
+  align-items: baseline;
+}
+
+.big-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
+  gap: 12px;
+}
+
+.small-grid {
+  display: grid;
+  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 10px;
-  padding: 16px 18px;
-  border-radius: 8px;
-  border: 1px solid rgba(128, 128, 128, 0.2);
-  cursor: pointer;
+}
+
+.card {
+  box-sizing: border-box;
+  min-width: 0;
+  border: 1px solid v-bind("theme.borderColor");
+  border-radius: 6px;
+  background: v-bind("theme.cardColor");
+  color: v-bind("theme.textColor1");
+  text-decoration: none;
  transition:
    border-color 0.2s,
    box-shadow 0.2s;
 }

-.set-card:hover {
-  border-color: #18a058;
+.card:hover {
+  border-color: v-bind("theme.primaryColor");
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.06);
 }

-.set-card.completed {
-  background-color: rgba(24, 160, 88, 0.05);
+.card.done {
+  background: v-bind("doneBackground");
 }

-.set-title {
-  font-size: 16px;
-  font-weight: 600;
-  overflow: hidden;
-  text-overflow: ellipsis;
-  white-space: nowrap;
-}
-
-.set-desc {
-  font-size: 13px;
-  display: -webkit-box;
-  -webkit-line-clamp: 2;
-  -webkit-box-orient: vertical;
-  overflow: hidden;
-}
-
-.set-progress {
+.big {
+  padding: 14px 16px;
  display: flex;
  flex-direction: column;
-  gap: 6px;
-  margin-top: auto;
+  gap: 8px;
 }

-.set-progress-text {
-  font-size: 13px;
+.title {
+  flex-grow: 1;
+  font-size: 16px;
 }

-.set-badges-label {
+.desc {
+  height: 17px;
  font-size: 12px;
-  margin-right: 2px;
 }

-.earned-badge {
-  border: 2px solid #ffd700;
-  border-radius: 50%;
-  box-shadow: 0 0 8px rgba(255, 215, 0, 0.4);
+.count {
+  font-size: 22px;
+  font-weight: 700;
 }

-/* 没拿到的徽章压成灰色：原来拿没拿到只差一圈金边，一排看下去分不清 */
-.locked-badge {
+.pill {
+  height: 22px;
+  padding: 0 8px;
+  border-radius: 3px;
+  font-size: 12px;
+  display: inline-flex;
+  align-items: center;
+  white-space: nowrap;
+  flex-shrink: 0;
+}
+
+.assign {
+  color: v-bind("info.color");
+  background: v-bind("info.background");
+}
+
+.done-pill {
+  color: v-bind("success.color");
+  background: v-bind("success.background");
+  font-weight: 600;
+}
+
+.bar {
+  height: 6px;
+  border-radius: 3px;
+  background: v-bind("theme.actionColor");
+  overflow: hidden;
+}
+
+.fill {
+  height: 100%;
+  background: v-bind("theme.successColor");
+}
+
+.hint {
+  height: 20px;
+  font-size: 12px;
+  color: v-bind("theme.textColor2");
+}
+
+.hint.got {
+  gap: 4px;
+  color: v-bind("success.color");
+}
+
+.hint.got span {
+  margin-left: 4px;
+}
+
+.icon {
+  width: 18px;
+  height: 18px;
+  flex-shrink: 0;
+}
+
+.mini {
+  width: 16px;
+  height: 16px;
+  flex-shrink: 0;
+}
+
+.locked {
  filter: grayscale(1);
-  opacity: 0.45;
+  opacity: 0.4;
+}
+
+.small-card {
+  height: 74px;
+  padding: 10px 14px;
+  display: flex;
+  flex-direction: column;
+  justify-content: space-between;
+}
+
+.small-card b {
+  font-size: 14px;
 }
 </style>
@@ -62,7 +62,7 @@ export const useFlowchartStore = defineStore("flowchart", () => {
   * 1.5 秒后跳回题单，都只认这一下 —— 进页面读到以前的 A 不该再跳一次
   */
  const evaluatedSeq = ref(0)
-  /** 这道题评完的每一次，早的在前；hidden = 加入题单之前、被藏起来的次数 */
+  /** 这道题评完的每一次，早的在前；hidden = 题单布置期内被藏起来的次数 */
  const scores = ref<FlowchartScores["scores"]>([])
  const hiddenCount = ref(0)
  const submissionCount = computed(() => scores.value.length)
@@ -202,7 +202,9 @@ const canRetry = computed(
      <Icon icon="ph:lock-simple" :width="30" class="lock-icon" />
      <!-- 列表项里没有 userId，分不出是别人的还是自己被题单挡住的，文案两种都说得通 -->
      <span class="locked-title">这张流程图看不到</span>
-      <span class="muted">别人画的看不到；自己的在题单里做完这道题就能看到。</span>
+      <span class="muted"
+        >别人画的看不到；自己以前画的在题单布置期内先藏着，在题单里做对或者布置期结束就能看到。</span
+      >
    </div>
    <div v-else class="body">
      <div class="graph-box">
@@ -1,4 +1,5 @@
 <script setup lang="ts">
+import LockNote from "oj/problemset/components/LockNote.vue"
 import { Icon } from "@iconify/vue"
 import { useThemeVars } from "naive-ui"
 import { getSubmission } from "oj/api"
@@ -388,8 +389,8 @@ function openStandalone() {
        </n-button>
      </template>
      <template v-else-if="locked === 'problemset'">
-        <span class="locked-title">这道题在你加入的题单里</span>
-        <span class="muted">加入题单之前交的代码先藏起来，在题单里做完这道题就能看到。</span>
+        <span class="locked-title">这份代码在题单布置期内先藏着</span>
+        <span class="muted"><LockNote :problem="{ displayId: row.problemDisplayId }" /></span>
      </template>
      <template v-else>
        <span class="locked-title">登录之后才能看代码</span>
@@ -3,7 +3,7 @@ import { useDark } from "@vueuse/core"

 export type Tone = "success" | "error" | "warning" | "info" | "default"

-function rgba(hex: string, alpha: number) {
+export function rgba(hex: string, alpha: number) {
  const value = hex.replace("#", "")
  const full =
    value.length === 3
@@ -968,7 +968,11 @@ function dayBreak(index: number) {
                    <span
                      v-if="!row.showLink"
                      class="lock-hint"
-                      :title="othersRow(row) ? '别人的代码看不到' : '在题单里做完才能看'"
+                      :title="
+                        othersRow(row)
+                          ? '别人的代码看不到'
+                          : '题单布置期内先藏着：在题单里做对，或者布置期结束就能看'
+                      "
                    >
                      <Icon icon="ph:lock-simple" :width="13" />
                    </span>
@@ -337,12 +337,14 @@ export const admins: RouteRecordRaw = {
      props: true,
      meta: { requiresTeacherAdmin: true },
    },
+    // 原来的「详情」页（题目 / 奖章 / 进度三个页签）并进了一屏编辑，老链接转过去
    {
      path: "problemset/:problemSetId",
      name: "admin problemset detail",
-      component: () => import("admin/problemset/detail.vue"),
-      props: true,
-      meta: { requiresTeacherAdmin: true },
+      redirect: (to) => ({
+        name: "admin problemset edit",
+        params: { problemSetId: to.params.problemSetId },
+      }),
    },
    {
      path: "ai/reports",
@@ -1,87 +0,0 @@
-<template>
-  <n-popover trigger="hover" placement="top">
-    <template #trigger>
-      <div class="badge-container">
-        <img
-          :src="badge.badge.icon"
-          :alt="badge.badge.name"
-          class="badge-icon"
-          @error="handleImageError"
-        />
-      </div>
-    </template>
-    <n-card size="small" class="badge-popover">
-      <n-flex vertical>
-        <n-text strong>{{ badge.badge.name }}</n-text>
-        <n-tag type="info"> 获得条件：{{ getConditionText() }} </n-tag>
-        <n-text depth="3">
-          获得时间：{{ parseTime(badge.earnedTime, "YYYY-MM-DD HH:mm:ss") }}
-        </n-text>
-      </n-flex>
-    </n-card>
-  </n-popover>
-</template>
-
-<script setup lang="ts">
-import type { UserBadge } from "utils/types"
-import { parseTime } from "utils/functions"
-interface Props {
-  badge: UserBadge
-}
-
-const props = defineProps<Props>()
-
-function handleImageError(event: Event) {
-  const img = event.target as HTMLImageElement
-  // 如果图片加载失败，显示默认图标
-  img.src = "/badge-1.png" // 使用默认徽章图标
-}
-
-function getConditionText() {
-  const { conditionType, conditionValue } = props.badge.badge
-
-  switch (conditionType) {
-    case "all_problems":
-      return "完成所有题目"
-    case "problem_count":
-      return `完成 ${conditionValue} 道题目`
-    case "score":
-      return `获得 ${conditionValue} 分`
-    default:
-      return "未知条件"
-  }
-}
-</script>
-
-<style scoped>
-.badge-container {
-  position: relative;
-  display: inline-block;
-  cursor: pointer;
-  width: 44px;
-  height: 44px;
-}
-
-.badge-icon {
-  width: 40px;
-  height: 40px;
-  border-radius: 50%;
-  object-fit: cover;
-  border: 2px solid #e0e0e0;
-  transition: all 0.3s ease;
-}
-
-.badge-icon:hover {
-  transform: scale(1.1);
-  border-color: #1890ff;
-  box-shadow: 0 4px 12px rgba(24, 144, 255, 0.3);
-}
-
-.badge-popover {
-  max-width: 280px;
-}
-
-.badge-popover .n-space {
-  gap: 6px;
-}
-</style>
@@ -195,31 +195,12 @@ export type {
  ProblemSetList,
  ProblemSetBadge,
  ProblemSetProblem,
-  ProblemSetProgress,
-  ProblemSetProgressList,
+  ProblemSetClassView,
+  ProblemSetClassStudent,
+  ProblemSetLock,
  UserBadge,
 } from "@oj2/contract"

-export type { CompletedProblem } from "@oj2/contract"
-
-export interface CreateProblemSetData {
-  title: string
-  description: string
-  difficulty: "Easy" | "Medium" | "Hard"
-  status: "active" | "archived" | "draft"
-  endTime?: Date | null
-}
-
-export interface EditProblemSetData {
-  id: number
-  title?: string
-  description?: string
-  difficulty?: "Easy" | "Medium" | "Hard"
-  status?: "active" | "archived" | "draft"
-  endTime?: Date | null
-  visible?: boolean
-}
-
 export interface Code {
  language: LANGUAGE
  value: string
@@ -339,12 +320,11 @@ export type {
  AdminUser,
  AdminUserList,
  AdminContestList,
-  AdminProblemSetProgress,
  AdminProblemSetProblem,
  AdminProblemSet,
  AdminProblemSetList,
  AdminProblemSetBadge,
-  AddProblemToSetRequest,
+  AddProblemsToSetResult,
  UpdateProblemInSetRequest,
  CreateProblemSetBadgeRequest,
  AdminAiReport,
@@ -6,6 +6,7 @@ import { achievementRaritySchema } from "./achievement"
 import { rankProfileSchema } from "./account"
 import { paginatedSchema, sampleUserSchema } from "./common"
 import { reactionKeySchema } from "./content"
+import { badgeConditionTypeSchema } from "./problemset"
 import { problemLanguageSchema, runnableLanguageSchema } from "./language"
 import {
  astRuleSchema,
@@ -358,17 +359,22 @@ export const updateAcmHelperRequestSchema = z.object({

 // ---------------------------------------------------------------- 题单管理

+// 难度、状态两列还留在表里（0026 没删列，删列要手工放行破坏性迁移），
+// 但界面和接口都不再用：线上 16 个题单全是 Easy / active，「状态 + 可见」两道闸合成了「公开」
 export const problemSetDifficultySchema = z.enum(["Easy", "Medium", "Hard"])
 export const problemSetStatusSchema = z.enum(["draft", "active", "archived"])
-export const badgeConditionTypeSchema = z.enum(["all_problems", "problem_count", "score"])

 export const adminProblemSetSchema = z.object({
  id: z.number().int(),
  title: z.string(),
  description: z.string(),
-  difficulty: problemSetDifficultySchema,
-  status: problemSetStatusSchema,
-  endTime: z.string().nullable(),
+  /** 布置到哪天（东八区当天结束）；null = 没布置 */
+  assignedUntil: z.string().nullable(),
+  /** 这一轮布置开始的时刻 */
+  assignedAt: z.string().nullable(),
+  /** 现在在不在布置期内（服务端的钟） */
+  assigning: z.boolean(),
+  /** 公开：学生能在题单列表里看到、能进 */
  visible: z.boolean(),
  createdBy: sampleUserSchema,
  createTime: z.string(),
@@ -376,23 +382,22 @@ export const adminProblemSetSchema = z.object({
  problemsCount: z.number().int(),
  /** 加入这份题单的人数，后台用来判断改动会影响多少人 */
  participantCount: z.number().int(),
+  /** 做完（必做题全对）的人数 */
+  completedCount: z.number().int(),
+  badgeCount: z.number().int(),
 })

 export const adminProblemSetListSchema = paginatedSchema(adminProblemSetSchema)

 export const createProblemSetRequestSchema = z.object({
  title: z.string().trim().min(1).max(200),
-  description: z.string(),
-  difficulty: problemSetDifficultySchema.default("Easy"),
-  status: problemSetStatusSchema.default("active"),
-  endTime: z.string().nullable().default(null),
+  description: z.string().default(""),
+  /** 布置到哪天；null = 不布置。从「没在布置」变成「布置到将来」时，服务端把布置开始记成现在 */
+  assignedUntil: z.string().nullable().default(null),
  visible: z.boolean().default(true),
 })

 export const updateProblemSetRequestSchema = createProblemSetRequestSchema
-export const updateProblemSetStatusRequestSchema = z.object({
-  status: problemSetStatusSchema,
-})

 export const adminProblemSetProblemSchema = z.object({
  id: z.number().int(),
@@ -403,24 +408,28 @@ export const adminProblemSetProblemSchema = z.object({
  difficulty: z.string(),
  order: z.number().int(),
  isRequired: z.boolean(),
-  score: z.number().int(),
-  hint: z.string().nullable(),
 })

-export const addProblemToSetRequestSchema = z.object({
-  /** 展示用题号（_id），不是自增主键 —— 老师手里只有题号 */
-  problemId: z.string().trim().min(1),
-  order: z.number().int().default(0),
-  isRequired: z.boolean().default(true),
-  score: z.number().int().default(0),
-  hint: z.string().default(""),
+export const addProblemsToSetRequestSchema = z.object({
+  /** 展示用题号（_id），不是自增主键 —— 老师手里只有题号。按给的顺序接在最后 */
+  problemIds: z.array(z.string().trim().min(1)).min(1).max(100),
+})
+
+export const addProblemsToSetResultSchema = z.object({
+  added: z.array(z.string()),
+  /** 题号不存在、不可见或是比赛题 */
+  missing: z.array(z.string()),
+  /** 本来就在题单里 */
+  duplicate: z.array(z.string()),
 })

 export const updateProblemInSetRequestSchema = z.object({
-  order: z.number().int().optional(),
-  isRequired: z.boolean().optional(),
-  score: z.number().int().optional(),
-  hint: z.string().optional(),
+  isRequired: z.boolean(),
+})
+
+/** 拖动排序：题单里题目的链接 id，按新顺序给全 */
+export const reorderProblemSetProblemsRequestSchema = z.object({
+  ids: z.array(z.number().int()).min(1),
 })

 export const adminProblemSetBadgeSchema = z.object({
@@ -438,27 +447,13 @@ export const adminProblemSetBadgeSchema = z.object({
 export const createProblemSetBadgeRequestSchema = z.object({
  name: z.string().trim().min(1).max(100),
  description: z.string(),
-  icon: z.string(),
+  icon: z.string().min(1),
  conditionType: badgeConditionTypeSchema,
  conditionValue: z.number().int().default(0),
 })

 export const updateProblemSetBadgeRequestSchema = createProblemSetBadgeRequestSchema

-export const adminProblemSetProgressSchema = z.object({
-  id: z.number().int(),
-  userId: z.number().int(),
-  username: z.string(),
-  realName: z.string().nullable(),
-  joinTime: z.string(),
-  completeTime: z.string().nullable(),
-  isCompleted: z.boolean(),
-  progressPercentage: z.number(),
-  completedProblemsCount: z.number().int(),
-  totalProblemsCount: z.number().int(),
-  totalScore: z.number().int(),
-})
-
 // ---------------------------------------------------------------- 标签与题目分析

 export const adminTagSchema = z.object({
@@ -927,7 +922,6 @@ export type AstCheckRequest = z.infer<typeof astCheckRequestSchema>
 export type AstCheckResponse = z.infer<typeof astCheckResponseSchema>
 export type GenerateTestInputsRequest = z.infer<typeof generateTestInputsRequestSchema>
 export type GenerateTestInputsResponse = z.infer<typeof generateTestInputsResponseSchema>
-export type AdminProblemSetProgress = z.infer<typeof adminProblemSetProgressSchema>

 export type AdminAnnouncementList = z.infer<typeof adminAnnouncementListSchema>
 export type CreateAnnouncementRequest = z.infer<typeof createAnnouncementRequestSchema>
@@ -959,14 +953,16 @@ export type UpdateContestRequest = z.infer<typeof updateContestRequestSchema>
 export type UpdateAcmHelperRequest = z.infer<typeof updateAcmHelperRequestSchema>
 export type ProblemSetDifficulty = z.infer<typeof problemSetDifficultySchema>
 export type ProblemSetStatus = z.infer<typeof problemSetStatusSchema>
-export type BadgeConditionType = z.infer<typeof badgeConditionTypeSchema>
 export type AdminProblemSet = z.infer<typeof adminProblemSetSchema>
 export type AdminProblemSetList = z.infer<typeof adminProblemSetListSchema>
 export type CreateProblemSetRequest = z.infer<typeof createProblemSetRequestSchema>
 export type UpdateProblemSetRequest = z.infer<typeof updateProblemSetRequestSchema>
-export type UpdateProblemSetStatusRequest = z.infer<typeof updateProblemSetStatusRequestSchema>
 export type AdminProblemSetProblem = z.infer<typeof adminProblemSetProblemSchema>
-export type AddProblemToSetRequest = z.infer<typeof addProblemToSetRequestSchema>
+export type AddProblemsToSetRequest = z.infer<typeof addProblemsToSetRequestSchema>
+export type AddProblemsToSetResult = z.infer<typeof addProblemsToSetResultSchema>
+export type ReorderProblemSetProblemsRequest = z.infer<
+  typeof reorderProblemSetProblemsRequestSchema
+>
 export type UpdateProblemInSetRequest = z.infer<typeof updateProblemInSetRequestSchema>
 export type AdminProblemSetBadge = z.infer<typeof adminProblemSetBadgeSchema>
 export type CreateProblemSetBadgeRequest = z.infer<typeof createProblemSetBadgeRequestSchema>
@@ -3,23 +3,38 @@ import { z } from "zod"
 import { paginatedSchema, sampleUserSchema } from "./common"
 import { maskedProblemDifficultySchema } from "./problem"

+/**
+ * 我在这份题单里的进度。
+ *
+ * 两个计数口径不同，别混用：
+ *   - completedCount / totalCount 只数**必做题**，进度条和「做完了」看它；
+ *   - solvedCount 数做对的**全部**题（含选做），「做对 N 道」奖章看它 ——
+ *     和后端 eligibleForBadge 的 problem_count 同一个口径。
+ */
 export const problemSetUserProgressSummarySchema = z.object({
  isJoined: z.boolean(),
-  progressPercentage: z.number(),
+  joinTime: z.string().nullable(),
  completedCount: z.number().int(),
  totalCount: z.number().int(),
+  solvedCount: z.number().int(),
  isCompleted: z.boolean(),
+  completeTime: z.string().nullable(),
 })

+/** 奖章只有两种条件：全部做完、做对 N 道（「总分达到 N」随分数一起拿掉了，0026 换算过） */
+export const badgeConditionTypeSchema = z.enum(["all_problems", "problem_count"])
+
 export const problemSetBadgeSchema = z.object({
  id: z.number().int(),
  problemSetId: z.number().int(),
  name: z.string(),
  description: z.string(),
  icon: z.string(),
-  conditionType: z.enum(["all_problems", "problem_count", "score"]),
+  conditionType: badgeConditionTypeSchema,
  conditionValue: z.number().int(),
  isEarned: z.boolean().optional(),
+  /** 我拿到它的时刻；没拿到、没登录为 null */
+  earnedTime: z.string().nullable().optional(),
 })

 export const problemSetSchema = z.object({
@@ -28,26 +43,26 @@ export const problemSetSchema = z.object({
  description: z.string(),
  createdBy: sampleUserSchema,
  createTime: z.string(),
-  lastUpdateTime: z.string().optional(),
-  difficulty: z.enum(["Easy", "Medium", "Hard"]),
-  status: z.enum(["active", "archived", "draft"]),
-  endTime: z.string().nullable(),
-  visible: z.boolean(),
+  /** 布置到哪天（东八区当天结束的时刻）；null = 没布置 */
+  assignedUntil: z.string().nullable(),
+  /** 现在是不是在布置期内。服务端按自己的钟算好，前端不用拿本机时间去比 */
+  assigning: z.boolean(),
+  /** 全部题数（含选做） */
  problemsCount: z.number().int(),
-  completedCount: z.number().int().optional(),
+  /** 必做题数（一道必做都没标时等于全部题数）——「做完」的分母，没加入时也要用 */
+  requiredCount: z.number().int(),
+  /** 加入过的人数 */
+  joinedCount: z.number().int(),
  userProgress: problemSetUserProgressSummarySchema,
-  badges: z.array(problemSetBadgeSchema).optional(),
+  badges: z.array(problemSetBadgeSchema),
 })

 export const problemSetListSchema = paginatedSchema(problemSetSchema)

 /**
- * 题单页的题目卡片只渲染题号、标题、难度，所以只下发这三样（外加题目主键）。
- *
- * 以前这里复用 problemListItemSchema，代价是服务端每次都要多 join 一次 user +
- * user_profile 凑 createdBy、再多查一次标签表凑 tags，而 tags / submissionNumber /
- * acceptedNumber / createdBy / flowchart / hasAstRules / myStatus 在题单页一个都不渲染
- * —— myStatus 甚至是写死的 null。
+ * 题单页的题目行只渲染题号、标题，所以只下发这几样（外加题目主键）。
+ * 以前复用 problemListItemSchema，服务端每次要多 join 一次 user / 标签表，
+ * 而那些字段题单页一个都不渲染。
 */
 export const problemSetProblemItemSchema = z.object({
  id: z.number().int(),
@@ -62,42 +77,72 @@ export const problemSetProblemSchema = z.object({
  problem: problemSetProblemItemSchema,
  order: z.number().int(),
  isRequired: z.boolean(),
-  score: z.number().int(),
-  hint: z.string().nullable(),
+  /** 在这份题单里做对了没有（代码通过，或流程图拿到 A / S） */
  isCompleted: z.boolean(),
+  /** 在这份题单里做对的时刻 */
+  solvedTime: z.string().nullable(),
+  /** 在这份题单里交错了几次（还没做对时显示「交过 n 次」） */
+  wrongCount: z.number().int(),
+  /**
+   * 布置期内、以前做对过、旧代码正被藏着 —— 行上标「以前做对过 · 旧代码先藏着」。
+   * 规则见后端 services/problemset.ts 的 problemSetLockCutoffs
+   */
+  oldCodeHidden: z.boolean(),
 })

 export const joinProblemSetRequestSchema = z.object({
  problemSetId: z.number().int().positive(),
 })

-export const completedProblemSchema = z.object({
-  id: z.number().int(),
-  _id: z.string(),
-  title: z.string(),
+/** 老师看某个班在这份题单里的情况：真名 × 每道题 */
+export const problemSetClassCellSchema = z.object({
+  /** 在题单里做对的时刻 */
+  solvedTime: z.string().nullable(),
+  /** 在题单里交错的次数 */
+  wrongCount: z.number().int(),
+  /** 加入之前就做对过这道题（任何入口） */
+  solvedBefore: z.boolean(),
 })

-export const problemSetProgressSchema = z.object({
-  id: z.number().int(),
+export const problemSetClassStudentSchema = z.object({
+  userId: z.number().int(),
+  username: z.string(),
+  realName: z.string().nullable(),
+  /** 没加入为 null */
+  joinTime: z.string().nullable(),
+  /** 做对的必做题数 */
+  completedCount: z.number().int(),
+  cells: z.array(problemSetClassCellSchema),
+})
+
+export const problemSetClassViewSchema = z.object({
+  /** 加入过这份题单的学生分属哪些班：三分之一以上的人加入了的班在前（按最近一次加入），零星几个人的在后 */
+  classes: z.array(
+    z.object({ className: z.string(), joined: z.number().int(), size: z.number().int() }),
+  ),
+  /** 这次看的是哪个班；谁都没加入时为 null */
+  className: z.string().nullable(),
+  problems: z.array(
+    z.object({
+      id: z.number().int(),
+      _id: z.string(),
+      title: z.string(),
+      isRequired: z.boolean(),
+      /** 这个班在题单里做对的人数 */
+      solved: z.number().int(),
+    }),
+  ),
+  /** 必做题数（全是选做时等于全部题数），「做完」的分母 */
+  totalCount: z.number().int(),
+  /** 这个班的全部学生（按学号），没加入的 joinTime 为 null */
+  students: z.array(problemSetClassStudentSchema),
+})
+
+/** 某道题为什么藏着旧代码：落在哪些正在布置的题单里 */
+export const problemSetLockSchema = z.object({
  problemSetId: z.number().int(),
-  user: sampleUserSchema,
-  joinTime: z.string(),
-  completeTime: z.string().nullable(),
-  isCompleted: z.boolean(),
-  progressPercentage: z.number(),
-  completedProblemsCount: z.number().int(),
-  totalProblemsCount: z.number().int(),
-  totalScore: z.number().int(),
-  completedProblems: z.array(completedProblemSchema),
-})
-
-export const problemSetProgressListSchema = paginatedSchema(problemSetProgressSchema).extend({
-  statistics: z.object({
-    total: z.number().int(),
-    completed: z.number().int(),
-    avgProgress: z.number(),
-  }),
-  problems: z.array(completedProblemSchema),
+  title: z.string(),
+  assignedUntil: z.string(),
 })

 export const userBadgeSchema = z.object({
@@ -112,10 +157,11 @@ export type ProblemSet = z.infer<typeof problemSetSchema>
 export type ProblemSetList = z.infer<typeof problemSetListSchema>
 export type ProblemSetBadge = z.infer<typeof problemSetBadgeSchema>
 export type ProblemSetProblem = z.infer<typeof problemSetProblemSchema>
-export type ProblemSetProgress = z.infer<typeof problemSetProgressSchema>
-export type ProblemSetProgressList = z.infer<typeof problemSetProgressListSchema>
+export type ProblemSetClassView = z.infer<typeof problemSetClassViewSchema>
+export type ProblemSetClassStudent = z.infer<typeof problemSetClassStudentSchema>
+export type ProblemSetLock = z.infer<typeof problemSetLockSchema>
 export type UserBadge = z.infer<typeof userBadgeSchema>
-export type CompletedProblem = z.infer<typeof completedProblemSchema>
+export type BadgeConditionType = z.infer<typeof badgeConditionTypeSchema>

 export type ProblemSetUserProgressSummary = z.infer<typeof problemSetUserProgressSummarySchema>
 export type JoinProblemSetRequest = z.infer<typeof joinProblemSetRequestSchema>