feat(看板娘): 记得你常错在哪，题目页上会主动开口，互动都记下来

- 按学生的行为挑话：最近 20 次提交里某类错特别多（运行出错细到 NameError、TypeError、
  ValueError、EOFError），再错这一类时点名说；今天做对第 3 道起偶尔数一数；
  第一次戳她有见面的话，戳得多了说「又是你」
- 题目页上主动开口：同一题错到第 5 次、连着 3 次没跑例子就交还错了、又犯老毛病、
  15 分钟没交没跑。比赛里不说，至少隔 3 分钟，同一件事一题一次，10 秒后收起
- 互动记进新表 mascot_event（0043）：点开、点按钮、主动开口、摸头、点烦、被拖走；
  只记看板娘这边的事，每人每分钟最多 30 条
- GET /mascot/profile 给最近的错类、今天做对几道、点过几次；门槛按本机生产快照定
  （266 人里运行出错 ≥3 的 87 人、答案错误 ≥5 的 82 人）
- 编辑过程（粘贴）数据学生侧不用，免得冤枉人

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

apps/api/src/db/0043_mascot_event.sql

@@ -0,0 +1,14 @@
+CREATE TABLE "mascot_event" (
+	"id" integer PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY (sequence name "mascot_event_id_seq" INCREMENT BY 1 MINVALUE 1 MAXVALUE 2147483647 START WITH 1 CACHE 1),
+	"user_id" integer NOT NULL,
+	"kind" text NOT NULL,
+	"situation" text,
+	"line" text,
+	"action" text,
+	"path" text NOT NULL,
+	"created_at" timestamp with time zone DEFAULT now() NOT NULL
+);
+--> statement-breakpoint
+ALTER TABLE "mascot_event" ADD CONSTRAINT "mascot_event_user_id_fk_user_id" FOREIGN KEY ("user_id") REFERENCES "public"."user"("id") ON DELETE cascade ON UPDATE no action;--> statement-breakpoint
+CREATE INDEX "mascot_event_user_kind_idx" ON "mascot_event" USING btree ("user_id","kind");--> statement-breakpoint
+CREATE INDEX "mascot_event_created_at_idx" ON "mascot_event" USING btree ("created_at");

apps/api/src/db/meta/_journal.json

@@ -302,6 +302,13 @@
       "when": 1793632543220,
       "tag": "0042_class_name_cleanup",
       "breakpoints": true
+    },
+    {
+      "idx": 43,
+      "version": "7",
+      "when": 1793693911394,
+      "tag": "0043_mascot_event",
+      "breakpoints": true
     }
   ]
 }

apps/api/src/db/schema.ts

@@ -46,6 +46,7 @@ import type {
   JudgeStatus,
   LessonLanguage,
   LessonMode,
+  MascotEventKind,
   ProblemChallenges,
   ProblemDifficulty,
   ProblemLanguage,
@@ -1411,3 +1412,45 @@ export const challengeSuccess = pgTable(
     }).onDelete('cascade'),
   ],
 )
+
+/**
+ * 看板娘的互动记录：点开气泡、点气泡里的按钮、她主动开口、摸头彩蛋、被拖走（种类见契约
+ * mascotEventSchema）。拿来看她说的话、给的按钮学生用不用，以后按学生的行为调整她也读这里；
+ * 「点过几次」（熟悉程度）直接按 user_id 数 open。
+ *
+ * 不是「学生做过什么」的证据，账号没了就没意义，user 外键 CASCADE（外键分档见 CLAUDE.md「数据库」）。
+ */
+export const mascotEvent = pgTable(
+  'mascot_event',
+  {
+    id: integer().primaryKey().generatedByDefaultAsIdentity({
+      name: 'mascot_event_id_seq',
+      startWith: 1,
+      increment: 1,
+      minValue: 1,
+      maxValue: 2147483647,
+      cache: 1,
+    }),
+    userId: integer('user_id').notNull(),
+    kind: text().$type<MascotEventKind>().notNull(),
+    situation: text(),
+    line: text(),
+    action: text(),
+    path: text().notNull(),
+    createdAt: timestamp('created_at', {
+      withTimezone: true,
+      mode: 'string',
+    })
+      .notNull()
+      .defaultNow(),
+  },
+  (table) => [
+    index('mascot_event_user_kind_idx').on(table.userId, table.kind),
+    index('mascot_event_created_at_idx').on(table.createdAt),
+    foreignKey({
+      columns: [table.userId],
+      foreignColumns: [user.id],
+      name: 'mascot_event_user_id_fk_user_id',
+    }).onDelete('cascade'),
+  ],
+)

apps/api/src/index.ts

@@ -21,6 +21,7 @@ import { problemRoutes } from './routes/problem'
 import { problemStatsRoutes } from './routes/problem-stats'
 import { submissionRoutes } from './routes/submission'
 import { trialRunRoutes } from './routes/trial-run'
+import { mascotRoutes } from './routes/mascot'
 import { siteRoutes } from './routes/site'
 import { scanPendingChallenges } from './services/challenge'
 import { bridgeSubmissionEvents, isAllowedWebSocketOrigin, startSessionSweep, submissionWebSocketHandler, type SubmissionSocketData } from './websocket'
@@ -44,6 +45,7 @@ app.route('/api', problemRoutes)
 app.route('/api', problemStatsRoutes)
 app.route('/api', submissionRoutes)
 app.route('/api', trialRunRoutes)
+app.route('/api', mascotRoutes)
 app.route('/api/admin', adminRoutes)
 
 // 没有这条的话，打错的接口地址回的是 Hono 默认的纯文本「404 Not Found」，前端 utils/api.ts 读不出

apps/api/src/routes/mascot.ts

@@ -0,0 +1,86 @@
+import { mascotEventSchema, type MascotProfile } from '@oj2/contract'
+import { and, count, countDistinct, desc, eq, gte, isNull, sql } from 'drizzle-orm'
+import { Hono } from 'hono'
+
+import { requireAuth, type AppEnv } from '../auth/middleware'
+import { db, schema } from '../db'
+import { parseBody, success } from '../http'
+import { dayStart } from '../time'
+
+export const mascotRoutes = new Hono<AppEnv>()
+
+/**
+ * 每人每分钟最多记这么多条。正常点她一分钟到不了十条（连点只记开头、彩蛋和嫌烦那几下），
+ * 拿脚本刷的才会撞上；撞上了就静默丢掉，不报错 —— 前台本来也不等这个结果
+ */
+const EVENTS_PER_MINUTE = 30
+const windows = new Map<number, { start: number; count: number }>()
+
+function allow(userId: number) {
+  const now = Date.now()
+  const entry = windows.get(userId)
+  if (!entry || now - entry.start >= 60_000) {
+    windows.set(userId, { start: now, count: 1 })
+    // 顺手清掉过期的，免得 Map 跟着在线人数一直涨
+    if (windows.size > 2000) for (const [id, it] of windows) if (now - it.start >= 60_000) windows.delete(id)
+    return true
+  }
+  entry.count++
+  return entry.count <= EVENTS_PER_MINUTE
+}
+
+/** 记一条看板娘互动（种类见契约 mascotEventSchema） */
+mascotRoutes.post('/mascot/events', requireAuth, async (c) => {
+  const parsed = await parseBody(c, mascotEventSchema, '看板娘记录的格式不对')
+  if (!parsed.success) return parsed.response
+  const user = c.get('user')!
+  if (allow(user.id)) {
+    const { kind, situation, line, action, path } = parsed.data
+    await db.insert(schema.mascotEvent).values({ userId: user.id, kind, situation, line, action, path })
+  }
+  return success(c, null)
+})
+
+/** 最近多少次题库提交拿来看学生常犯哪类错 */
+const RECENT_SUBMISSIONS = 20
+
+/** 看板娘按学生的行为挑话用的那几个数（契约 mascotProfileSchema） */
+mascotRoutes.get('/mascot/profile', requireAuth, async (c) => {
+  const userId = c.get('user')!.id
+  const s = schema.submission
+
+  const [pokes, today, recent] = await Promise.all([
+    db
+      .select({ value: count() })
+      .from(schema.mascotEvent)
+      .where(and(eq(schema.mascotEvent.userId, userId), eq(schema.mascotEvent.kind, 'open'))),
+    db
+      .select({ value: countDistinct(s.problemId) })
+      .from(s)
+      .where(and(eq(s.userId, userId), eq(s.result, 0), gte(s.createTime, dayStart()))),
+    db
+      .select({ result: s.result, errorType: sql<string | null>`${s.statisticInfo}->'runtime_error'->>'type'` })
+      .from(s)
+      .where(and(eq(s.userId, userId), isNull(s.contestId)))
+      .orderBy(desc(s.createTime))
+      .limit(RECENT_SUBMISSIONS),
+  ])
+
+  const types = new Map<string, number>()
+  for (const row of recent) if (row.result === 4 && row.errorType) types.set(row.errorType, (types.get(row.errorType) ?? 0) + 1)
+  const topType = [...types.entries()].sort((a, b) => b[1] - a[1])[0]?.[0] ?? null
+  const tally = (...results: number[]) => recent.filter((row) => results.includes(row.result)).length
+
+  return success(c, {
+    pokes: pokes[0]?.value ?? 0,
+    todaySolved: today[0]?.value ?? 0,
+    recent: {
+      total: recent.length,
+      wrongAnswer: tally(-1),
+      compileError: tally(-2),
+      runtimeError: tally(4, 3),
+      timeout: tally(1, 2),
+      runtimeErrorType: topType,
+    },
+  } satisfies MascotProfile)
+})

apps/web/src/oj/problem/composables/mascotGuide.ts

@@ -1,5 +1,6 @@
 import { useBreakpoints } from 'shared/composables/breakpoints'
 import { useMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
+import { habitSituation, refreshMascotProfile, requestSpeech } from 'shared/mascot/behavior'
 import type { MascotSituation } from 'shared/mascot/lines'
 import { useCollabStore } from 'shared/store/collab'
 import { useLessonStore } from 'shared/store/lesson'
@@ -8,6 +9,7 @@ import { useCodeStore } from 'oj/store/code'
 import { useProblemStore } from 'oj/store/problem'
 import { useSubmissionStore, type ResultSegment } from 'oj/store/submission'
 import { SubmissionStatus } from 'utils/constants'
+import type { ProblemDetail } from 'utils/types'
 import { useProblemPageContext } from './problemPageContext'
 import { useTeacherCollab } from './teacherCollab'
 
@@ -27,10 +29,21 @@ const RESULT_SITUATION: Partial<Record<SubmissionStatus, MascotSituation>> = {
   [SubmissionStatus.real_time_limit_exceeded]: 'problem.timeout',
 }
 
+/** 一道题上这么久没交、没跑例子，她就来问一句（主动开口） */
+const IDLE_MS = 15 * 60_000
+/** 连着这么多次没跑例子就交，而且错了，她就念一句 */
+const UNSAMPLED_SUBMITS = 3
+
+const FINISHED = (result: number | undefined) =>
+  result !== undefined && result !== SubmissionStatus.pending && result !== SubmissionStatus.judging && result !== SubmissionStatus.submitting
+
 /**
  * 题目页上看板娘说什么、给哪几个按钮。看的是这一页上最近的那件事：刚交的结果、刚跑的例子，
  * 都没有就看写没写代码。比赛入口不用管（Mascot.vue 在比赛里不弹）。
  *
+ * 另外几件事她会主动开口（只对学生，频率上限在 Mascot.vue）：同一道题错到第 5 次、连着 3 次
+ * 没跑例子就交还错了、又犯了自己的老毛病（behavior.ts 的 habitSituation）、15 分钟没交没跑。
+ *
  * `showResult` 是「我错在哪」：把左栏切到「结果」页签的那一段（提交结果 / 运行例子），页签归页面管。
  */
 export function useProblemMascotGuide(showResult: (segment: ResultSegment) => void) {
@@ -45,6 +58,31 @@ export function useProblemMascotGuide(showResult: (segment: ResultSegment) => vo
   const teacherCollab = useTeacherCollab()
   const { isDesktop } = useBreakpoints()
 
+  /** 学生在这道题上能用的几个按钮，点她和她主动开口共用 */
+  function studentActions(problem: ProblemDetail) {
+    const language = codeStore.code.language
+    const entry = ctx.value
+    const runSamples: MascotAction | null =
+      problem.samples.length && language !== 'Flowchart' && language !== 'SQL' ? { label: '运行例子', run: submissionStore.runSamples } : null
+    // 和工具栏的「举手求助」同一个条件；已经举着手、老师在帮的时候不给
+    const help: MascotAction | null =
+      entry.help && isDesktop.value && !userStore.demoMode && language !== 'Flowchart' && collabStore.helpStatus === 'idle'
+        ? { label: '举手求助', run: () => collabStore.requestHelp(problem._id, language) }
+        : null
+    const why: MascotAction = { label: '我错在哪', run: () => showResult('submit') }
+    const whySamples: MascotAction = { label: '我错在哪', run: () => showResult('samples') }
+    const busy = submissionStore.isFormatting || submissionStore.isSubmittingRequest || submissionStore.judging || submissionStore.isCooldown
+    const submit: MascotAction | null = busy
+      ? null
+      : { label: '提交', run: () => submissionStore.submit({ contestId: entry.contestId, problemSetId: entry.problemSetId }) }
+    return { runSamples, help, why, whySamples, submit }
+  }
+
+  const guide = (situation: MascotSituation, ...actions: (MascotAction | null)[]): MascotGuide => ({
+    situation,
+    actions: actions.filter((it): it is MascotAction => !!it),
+  })
+
   useMascotGuide(() => {
     const problem = problemStore.problem
     if (!problem) return null
@@ -59,28 +97,10 @@ export function useProblemMascotGuide(showResult: (segment: ResultSegment) => vo
       return { situation: 'teacher.problem', actions }
     }
 
-    const language = codeStore.code.language
     const entry = ctx.value
+    const { runSamples, help, why, whySamples, submit } = studentActions(problem)
 
-    const runSamples: MascotAction | null =
-      problem.samples.length && language !== 'Flowchart' && language !== 'SQL' ? { label: '运行例子', run: submissionStore.runSamples } : null
-    // 和工具栏的「举手求助」同一个条件；已经举着手、老师在帮的时候不给
-    const help: MascotAction | null =
-      entry.help && isDesktop.value && !userStore.demoMode && language !== 'Flowchart' && collabStore.helpStatus === 'idle'
-        ? { label: '举手求助', run: () => collabStore.requestHelp(problem._id, language) }
-        : null
-    const why: MascotAction = { label: '我错在哪', run: () => showResult('submit') }
-    const busy = submissionStore.isFormatting || submissionStore.isSubmittingRequest || submissionStore.judging || submissionStore.isCooldown
-    const submit: MascotAction | null = busy
-      ? null
-      : { label: '提交', run: () => submissionStore.submit({ contestId: entry.contestId, problemSetId: entry.problemSetId }) }
-
-    const guide = (situation: MascotSituation, ...actions: (MascotAction | null)[]): MascotGuide => ({
-      situation,
-      actions: actions.filter((it): it is MascotAction => !!it),
-    })
-
-    if (language === 'Flowchart') return guide('problem.flowchart', help)
+    if (codeStore.code.language === 'Flowchart') return guide('problem.flowchart', help)
     // 正在判、正在跑例子：没什么好说的，打个招呼
     if (submissionStore.judging || submissionStore.pending || submissionStore.trial.samplesRunning.value) return null
 
@@ -91,7 +111,7 @@ export function useProblemMascotGuide(showResult: (segment: ResultSegment) => vo
     if (submissionStore.resultSegment === 'samples' && runs.length) {
       return runs.every((run) => run.result === SubmissionStatus.accepted)
         ? guide('problem.samplesPassed', submit)
-        : guide('problem.samplesFailed', { label: '我错在哪', run: () => showResult('samples') }, help)
+        : guide('problem.samplesFailed', whySamples, help)
     }
 
     const result = submissionStore.submission?.result
@@ -114,4 +134,71 @@ export function useProblemMascotGuide(showResult: (segment: ResultSegment) => vo
       return next ? { label: '下一道', run: () => router.push(`/problem/${next.problemDisplayId}`) } : null
     }
   })
+
+  // ---- 主动开口（只对学生；比赛里 Mascot.vue 不弹）----
+
+  const student = () => userStore.isAuthed && !userStore.isTeacherOrAbove && ctx.value.entry !== 'contest'
+
+  /** 这道题上连着几次没跑例子就交了。跑过一次例子就清零 */
+  let unsampledSubmits = 0
+  let sampledSinceSubmit = false
+  /** 上一次「动静」（进题、交、跑例子）的时刻，给「盯了好久」用 */
+  let lastActivity = Date.now()
+
+  watch(
+    () => problemStore.problem?.id,
+    () => {
+      unsampledSubmits = 0
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+  watch(
+    () => submissionStore.trial.samplesRunAt.value,
+    (at) => {
+      if (!at) return
+      sampledSinceSubmit = true
+      lastActivity = Date.now()
+    },
+  )
+  watch(
+    () => submissionStore.submission?.id,
+    (id) => {
+      if (!id) return
+      unsampledSubmits = sampledSinceSubmit ? 0 : unsampledSubmits + 1
+      sampledSinceSubmit = false
+      lastActivity = Date.now()
+    },
+  )
+
+  // 判完了：错了就看要不要说一句；不管对错都刷新行为数（最近的错、今天做对几道）
+  watch(
+    () => [submissionStore.submission?.id, submissionStore.submission?.result] as const,
+    ([id, result]) => {
+      const problem = problemStore.problem
+      if (!id || !FINISHED(result) || !problem || !student()) return
+      refreshMascotProfile(true)
+      const failed = RESULT_SITUATION[result as SubmissionStatus]
+      if (!failed) return
+      const { runSamples, help, why } = studentActions(problem)
+      if (problemStore.failCount >= STUCK_FAILS) {
+        requestSpeech({ key: `stuck:${problem.id}`, ...guide('problem.stuck', help, why) })
+      } else if (unsampledSubmits >= UNSAMPLED_SUBMITS && runSamples) {
+        requestSpeech({ key: `unsampled:${problem.id}`, ...guide('habit.noSamples', runSamples) })
+      } else {
+        const habit = habitSituation(failed)
+        if (habit) requestSpeech({ key: `habit:${habit}`, ...guide(habit, why) })
+      }
+    },
+  )
+
+  // 盯着一道没做对的题 15 分钟，没交也没跑：问一句
+  useIntervalFn(() => {
+    const problem = problemStore.problem
+    if (!problem || !student() || Date.now() - lastActivity < IDLE_MS) return
+    if (problem.myStatus === SubmissionStatus.accepted || submissionStore.submission?.result === SubmissionStatus.accepted) return
+    if (codeStore.code.language === 'Flowchart') return
+    const { runSamples, help } = studentActions(problem)
+    requestSpeech({ key: `idle:${problem.id}`, ...guide('idle.stuck', help, runSamples) })
+  }, 30_000)
 }

apps/web/src/shared/components/Mascot.vue

@@ -10,7 +10,10 @@
  * - 在屏幕左半边时整体镜像，脸总朝着页面中间。
  * - 按下去像玩偶一样压扁（底边不动），松手弹回。
  * - 点一下冒气泡：一句话加最多三个按钮，按页面、按情况变（页面经 shared/mascot/guide.ts 告诉她），
- *   台词在 shared/mascot/lines.ts。她从不主动开口；比赛里点她不弹气泡。再点一下、点别处、换页面都收起。
+ *   台词在 shared/mascot/lines.ts。比赛里点她不弹气泡。再点一下、点别处、换页面都收起。
+ * - 对学生按行为挑话（常犯的错、今天做了几道、熟不熟，见 shared/mascot/behavior.ts）；
+ *   题目页上有几件事她会主动开口，频率上限在下面 SPEAK_GAP_MS。
+ * - 互动都记进 mascot_event（点开、点按钮、主动开口、摸头、嫌烦、被拖走）。
  * - 彩蛋：连着快点，有时候（每轮三分之一的机会）点到第 4～8 下（也是随机的）会被摸摸头（同一个仓库的 assets/rua.gif），摸的时候接着点就一直摸。
  *
  * 位置只是这台电脑上的个人偏好，存 localStorage（读写都包 try/catch，拿不到就用默认位置）。
@@ -21,6 +24,7 @@ import imageUrl from 'shared/assets/mascot/whale.webp'
 import patUrl from 'shared/assets/mascot/whale-pat.gif'
 import { MASCOT_LINES, type MascotSituation } from 'shared/mascot/lines'
 import { currentMascotGuide, type MascotAction, type MascotGuide } from 'shared/mascot/guide'
+import { logMascotEvent, notePoke, personalize, refreshMascotProfile, speechRequest } from 'shared/mascot/behavior'
 import { useAuthModalStore } from 'shared/store/authModal'
 import { useCollabStore } from 'shared/store/collab'
 import { useUserStore } from 'shared/store/user'
@@ -46,6 +50,8 @@ function rollPatClicks() {
 const STREAK_GAP_MS = 600 // 两下之间超过这么久就不算连点
 const OVERCLICK = 8 // 一轮连点到这么多下还没摸到头，她就嫌烦了
 const QUIET_BUBBLE_MS = 5000 // 没有按钮的气泡（只是一句话）过这么久自己收起
+const SPOKEN_BUBBLE_MS = 10_000 // 她主动说的话，有按钮也过这么久收起：没人点她，不该一直挡着
+const SPEAK_GAP_MS = 3 * 60_000 // 主动开口至少隔这么久，课上别老打岔
 
 type HAnchor = 'left' | 'right' | null
 type VAnchor = 'top' | 'bottom' | null
@@ -173,6 +179,7 @@ function onUp() {
     place.y = pos.y
     settle()
     savePlace(place)
+    logMascotEvent({ kind: 'move', line: `${place.h ?? '-'} ${place.v ?? '-'}` })
     return
   }
   boing()
@@ -187,7 +194,10 @@ function onUp() {
 
   // 正在被摸，或者连点到数了：摸摸头，从这一下再摸满一轮
   if (patting.value || streak >= patClicks) {
-    if (!patting.value) say({ text: pick('patting') })
+    if (!patting.value) {
+      say({ text: pick('patting') })
+      logMascotEvent({ kind: 'pat' })
+    }
     patting.value = true
     clearTimeout(patTimer)
     patTimer = setTimeout(() => {
@@ -198,7 +208,10 @@ function onUp() {
   }
   // 一轮里只有第一下开关气泡，后面连着点是在找彩蛋，不跟着一开一关
   if (streak === 1) toggleBubble()
-  else if (streak === OVERCLICK) say({ text: pick('overclick') })
+  else if (streak === OVERCLICK) {
+    say({ text: pick('overclick') })
+    logMascotEvent({ kind: 'overclick' })
+  }
 }
 
 // ---- 气泡 ----
@@ -211,6 +224,8 @@ const authModal = useAuthModalStore()
 interface Bubble {
   text: string
   actions?: MascotAction[]
+  /** 记互动时带上，看哪种情况下的按钮有人点 */
+  situation?: string
 }
 const bubble = ref<Bubble | null>(null)
 let quietTimer: ReturnType<typeof setTimeout> | undefined
@@ -218,11 +233,11 @@ let quietTimer: ReturnType<typeof setTimeout> | undefined
 /** 比赛、测验里不说话：「运行例子」「举手」这类按钮在考试时算不算帮忙，干脆不弹 */
 const silent = computed(() => String(route.name ?? '').startsWith('contest '))
 
-function say(next: Bubble) {
+function say(next: Bubble, closeAfter = next.actions?.length ? 0 : QUIET_BUBBLE_MS) {
   if (silent.value) return
   bubble.value = next
   clearTimeout(quietTimer)
-  if (!next.actions?.length) quietTimer = setTimeout(close, QUIET_BUBBLE_MS)
+  if (closeAfter) quietTimer = setTimeout(close, closeAfter)
 }
 
 function close() {
@@ -232,8 +247,13 @@ function close() {
 
 function toggleBubble() {
   if (bubble.value) return close()
-  const guide = resolveGuide()
-  say({ text: pickFor(guide), actions: guide.actions?.slice(0, 3) })
+  let guide = resolveGuide()
+  if (!userStore.isTeacherOrAbove) guide = personalize(guide)
+  const text = pickFor(guide)
+  say({ text, actions: guide.actions?.slice(0, 3), situation: guide.situation })
+  if (silent.value) return
+  notePoke()
+  logMascotEvent({ kind: 'open', situation: guide.situation, line: text })
 }
 
 /** 先看全站的：没登录、老师这边有人举手；再问页面；都没有就打个招呼 */
@@ -247,7 +267,7 @@ function resolveGuide(): MascotGuide {
 }
 
 /** 这几种情况要紧，不拿彩蛋换掉 */
-const SERIOUS = new Set<MascotSituation>(['guest', 'teacher.help', 'problem.stuck'])
+const SERIOUS = new Set<MascotSituation>(['guest', 'teacher.help', 'problem.stuck', 'first.meet'])
 const RARE_CHANCE = 0.03
 const TIME_CHANCE = 0.15
 
@@ -294,10 +314,36 @@ function timeSituation(): MascotSituation | null {
 }
 
 async function runAction(action: MascotAction) {
+  logMascotEvent({ kind: 'action', action: action.label, situation: bubble.value?.situation })
   close()
   await action.run()
 }
 
+// ---- 主动开口：页面经 requestSpeech 请她说，这里卡频率 ----
+let lastSpokeAt = -Infinity
+const spokenKeys = new Set<string>()
+watch(speechRequest, (speech) => {
+  if (!speech || silent.value || dragging.value || bubble.value || userStore.isTeacherOrAbove) return
+  if (document.visibilityState !== 'visible' || spokenKeys.has(speech.key)) return
+  if (performance.now() - lastSpokeAt < SPEAK_GAP_MS) return
+  lastSpokeAt = performance.now()
+  spokenKeys.add(speech.key)
+  const text = pick(speech.situation).replace('{n}', String(speech.n ?? ''))
+  say({ text, actions: speech.actions?.slice(0, 3), situation: speech.situation }, SPOKEN_BUBBLE_MS)
+  logMascotEvent({ kind: 'speak', situation: speech.situation, line: text })
+})
+
+// 学生的行为数：进站、换页面时拉（30 秒内拉过就不拉），登录换人时重拉
+watch(
+  () => route.fullPath,
+  () => refreshMascotProfile(),
+)
+watch(
+  () => userStore.user?.id,
+  () => refreshMascotProfile(true),
+  { immediate: true },
+)
+
 // 点别处收起；点她自己由 onUp 管（开关），不算「别处」
 onClickOutside(bubbleEl, close, { ignore: [body] })
 watch(() => route.fullPath, close)

apps/web/src/shared/mascot/behavior.ts

@@ -0,0 +1,122 @@
+import type { MascotEventInput, MascotProfile } from '@oj2/contract'
+import api from 'utils/api'
+import { useUserStore } from 'shared/store/user'
+import type { MascotGuide } from './guide'
+import type { MascotSituation } from './lines'
+
+/**
+ * 看板娘按学生的行为挑话：常犯哪类错、今天做了几道、和她熟不熟。数从 GET /mascot/profile 来，
+ * 那边按库里的提交和互动记录算；互动本身经 logMascotEvent 记进 mascot_event。
+ *
+ * 只对学生。老师的话不跟着行为变。
+ */
+
+/** 记一条互动。只记登录了的，失败就算了：前台不等它、也不提示 */
+export function logMascotEvent(event: Omit<MascotEventInput, 'path'>) {
+  if (!useUserStore().isAuthed) return
+  const body: MascotEventInput = { ...event, path: location.pathname.slice(0, 200) }
+  if (body.line) body.line = body.line.slice(0, 100)
+  api.post('mascot/events', body).catch(() => {})
+}
+
+export const mascotProfile = shallowRef<MascotProfile | null>(null)
+let loadedAt = 0
+let loading: Promise<void> | null = null
+/** 进页面、交完一次都想要新的数，但别每次都打一遍 */
+const STALE_MS = 30_000
+
+export function refreshMascotProfile(force = false) {
+  const userStore = useUserStore()
+  if (!userStore.isAuthed || userStore.isTeacherOrAbove) {
+    mascotProfile.value = null
+    return null
+  }
+  if (loading) return loading
+  if (!force && mascotProfile.value && Date.now() - loadedAt < STALE_MS) return null
+  loading = api
+    .get<MascotProfile>('mascot/profile')
+    .then((profile) => {
+      mascotProfile.value = profile
+      loadedAt = Date.now()
+    })
+    .catch(() => {})
+    .finally(() => {
+      loading = null
+    })
+  return loading
+}
+
+/** 这一页会话里点开过几次：第一次见面那句只说一回，刚点过的也算熟了一点 */
+let sessionPokes = 0
+export function notePoke() {
+  sessionPokes++
+}
+
+// 门槛按本机生产快照定的（2026-11，最近 120 天交过 10 次以上的 266 个学生）：最近 20 次里
+// 运行出错 ≥3 的 87 人、答案错误 ≥5 的 82 人，各占三成；编译错误有提交前语法检查，≥3 的只有 7 人
+const HABIT_MIN = { wrongAnswer: 5, compileError: 3, runtimeError: 3, timeout: 2 } as const
+/** 有专门几句的运行错误类型，别的走 habit.runtimeError */
+const NAMED_RUNTIME_ERRORS = new Set(['NameError', 'TypeError', 'ValueError', 'EOFError'])
+
+/**
+ * 这一类错是不是这个学生的老毛病：是就给对应的那组话，不是返回 null。
+ * 题目页点她、交完错了她主动开口都走这里
+ */
+export function habitSituation(failure: MascotSituation): MascotSituation | null {
+  const recent = mascotProfile.value?.recent
+  if (!recent) return null
+  switch (failure) {
+    case 'problem.wrong':
+      return recent.wrongAnswer >= HABIT_MIN.wrongAnswer ? 'habit.wrongAnswer' : null
+    case 'problem.compileError':
+      return recent.compileError >= HABIT_MIN.compileError ? 'habit.compileError' : null
+    case 'problem.runtimeError': {
+      if (recent.runtimeError < HABIT_MIN.runtimeError) return null
+      const type = recent.runtimeErrorType
+      return type && NAMED_RUNTIME_ERRORS.has(type) ? (`habit.${type}` as MascotSituation) : 'habit.runtimeError'
+    }
+    case 'problem.timeout':
+      return recent.timeout >= HABIT_MIN.timeout ? 'habit.timeout' : null
+    default:
+      return null
+  }
+}
+
+const HABIT_CHANCE = 0.6
+const TODAY_CHANCE = 0.4
+const FAMILIAR_CHANCE = 0.2
+/** 点开过这么多次算老熟人 */
+const FAMILIAR_POKES = 50
+/** 今天做到这么多道才拿出来说 */
+const TODAY_MIN = 3
+const GREETINGS = new Set<MascotSituation>(['greet', 'announcement', 'achievement', 'profile'])
+const PRAISE = new Set<MascotSituation>(['problem.accepted', 'problem.firstTry', 'problem.finally', 'home.done', 'home.assigned', 'home.free'])
+
+/** 点她的时候：按行为把页面给的情况换成更贴这个学生的那一组（按钮不变） */
+export function personalize(guide: MascotGuide): MascotGuide {
+  const profile = mascotProfile.value
+  if (!profile) return guide
+  if (profile.pokes + sessionPokes === 0) return { ...guide, situation: 'first.meet', n: undefined }
+  const habit = habitSituation(guide.situation)
+  if (habit && Math.random() < HABIT_CHANCE) return { ...guide, situation: habit }
+  if (PRAISE.has(guide.situation) && profile.todaySolved >= TODAY_MIN && Math.random() < TODAY_CHANCE) {
+    return { ...guide, situation: 'today.count', n: profile.todaySolved }
+  }
+  if (GREETINGS.has(guide.situation) && profile.pokes >= FAMILIAR_POKES && Math.random() < FAMILIAR_CHANCE) {
+    return { ...guide, situation: 'familiar' }
+  }
+  return guide
+}
+
+// ---- 主动开口 ----
+
+export interface MascotSpeech extends MascotGuide {
+  /** 同一个 key 一次页面会话里只说一次（比如「这道题卡住了」每道题只说一回） */
+  key: string
+}
+
+/** 页面请她主动说一句；说不说、什么时候说由 Mascot.vue 按频率上限定 */
+export const speechRequest = shallowRef<MascotSpeech | null>(null)
+export function requestSpeech(speech: MascotSpeech) {
+  speechRequest.value = speech
+}

apps/web/src/shared/mascot/lines.ts

@@ -130,6 +130,24 @@ export const MASCOT_LINES = {
   'teacher.problemset': ['全班进度，记着呢', '谁没做完，一看就知道', '奖章发得出去吗'],
   'teacher.greet': ['老师好……才不是特意打招呼', '有事？', '忙完了？', '喝口水吧', '下课了吗', '今天几节课？', '辛苦……随口说的'],
 
+  // ---- 按学生的行为挑的（shared/mascot/behavior.ts）----
+  // 最近 20 次提交里某类错特别多，再错这一类时换成这几句
+  'habit.wrongAnswer': ['又是答案错误，例子对了没', '你老栽在输出上', '空格、换行再对一遍', '格式的事，又是', '这类错你很熟了吧'],
+  'habit.compileError': ['又是编译错误。中文标点？', '每次都是符号的事', '红字看完再改', '括号、冒号，老三样'],
+  'habit.runtimeError': ['又崩了，这次哪一行', '运行出错你最拿手了……不是夸你', '又炸了，看看报错'],
+  'habit.NameError': ['又是变量名，拼对了没', '用之前先赋值', '大小写也算不一样的名字', '名字又对不上了'],
+  'habit.TypeError': ['又是类型不对，input 出来的是文字', '数字和文字不能直接加', '先 int() 再算'],
+  'habit.ValueError': ['int() 里放了不是数字的东西', '输入格式再看看，一行几个数？', '又把一整行塞进 int() 了吧'],
+  'habit.EOFError': ['又多读了一行', 'input() 比输入的行数多了', '一行几个数，用一次 input() 再 split()'],
+  'habit.timeout': ['又超时，循环停得下来吗', '死循环又来了', '循环变量改了没'],
+  // 这一页上的习惯
+  'habit.noSamples': ['又没跑例子？', '第几次不跑例子了', '跑一下又不会少块肉', '例子都不跑，就硬交？'],
+  'idle.stuck': ['盯了好久了，举个手？', '卡住了吧', '要不先跑一下例子', '发呆也算做题吗'],
+  // 今天和熟悉程度
+  'today.count': ['今天第 {n} 道了……还行', '{n} 道了，别骄傲', '今天挺能做嘛，{n} 道', '才 {n} 道，再来'],
+  'first.meet': ['初次见面。……才不是特意等你', '你是新来的？', '第一次戳我？', '叫我小鲸鱼就行，别叫大肥鱼'],
+  familiar: ['又是你', '你今天戳了几次了', '习惯了，戳吧', '老熟人了', '又来找我？'],
+
   // ---- 招呼与彩蛋 ----
   greet: [
     '干嘛',