update

src/composables/useTeachingBook.ts

@@ -0,0 +1,226 @@
+import { ref, watch, type Ref } from 'vue'
+import {
+  createEmptyBook,
+  type BookCover,
+  type DesignId,
+  type TeachingBook,
+  type TeachingDesign,
+} from '../domain/teachingDesign'
+import { saveBook } from '../services/bookStorage'
+import { parseTeachingDesign } from '../services/markdownParser'
+import { sortFilesNaturally } from '../services/naturalSort'
+
+const AUTOSAVE_DELAY_MS = 300
+
+export type DuplicateStrategy = 'replace' | 'keep'
+
+export type SaveStatus = 'idle' | 'saving' | 'saved' | 'error'
+
+export interface ImportResult {
+  imported: number
+  failed: Array<{ filename: string; message: string }>
+  duplicates: string[]
+}
+
+export interface TeachingBookStore {
+  book: Ref<TeachingBook>
+  saveStatus: Ref<SaveStatus>
+  lastError: Ref<string | null>
+  pendingDuplicateFiles: Ref<File[]>
+  selectedDesign: Ref<TeachingDesign | null>
+  hasDesigns: Ref<boolean>
+  warningCount: Ref<number>
+  importFiles: (files: readonly File[], strategy: DuplicateStrategy) => Promise<ImportResult>
+  detectDuplicates: (files: readonly File[]) => string[]
+  selectPage: (id: 'cover' | DesignId) => void
+  moveDesign: (from: number, to: number) => void
+  removeDesign: (id: DesignId) => void
+  updateCover: (patch: Partial<BookCover>) => void
+  updateDesign: (id: DesignId, updater: (design: TeachingDesign) => void) => void
+  restore: (book: TeachingBook) => void
+  clearBook: () => void
+}
+
+export function useTeachingBook(): TeachingBookStore {
+  const book = ref<TeachingBook>(createEmptyBook()) as Ref<TeachingBook>
+  const saveStatus = ref<SaveStatus>('idle')
+  const lastError = ref<string | null>(null)
+  const pendingDuplicateFiles = ref<File[]>([])
+
+  const selectedDesign = ref<TeachingDesign | null>(null)
+  const hasDesigns = ref(false)
+  const warningCount = ref(0)
+
+  function syncDerived(): void {
+    const current = book.value
+    hasDesigns.value = current.designs.length > 0
+    selectedDesign.value =
+      current.selectedId === 'cover'
+        ? null
+        : current.designs.find((design) => design.id === current.selectedId) ?? null
+    warningCount.value = current.designs.reduce(
+      (total, design) => total + design.warnings.length,
+      0,
+    )
+  }
+
+  syncDerived()
+
+  let autosaveTimer: ReturnType<typeof setTimeout> | undefined
+
+  function touch(): void {
+    book.value.updatedAt = new Date().toISOString()
+  }
+
+  watch(
+    book,
+    () => {
+      syncDerived()
+
+      if (autosaveTimer !== undefined) {
+        clearTimeout(autosaveTimer)
+      }
+
+      autosaveTimer = setTimeout(() => {
+        saveStatus.value = 'saving'
+        const result = saveBook(book.value)
+        if (result.ok) {
+          saveStatus.value = 'saved'
+          lastError.value = null
+        } else {
+          saveStatus.value = 'error'
+          lastError.value = result.message
+        }
+      }, AUTOSAVE_DELAY_MS)
+    },
+    { deep: true },
+  )
+
+  function detectDuplicates(files: readonly File[]): string[] {
+    const existingNames = new Set(book.value.designs.map((design) => design.originalFilename))
+    return files.map((file) => file.name).filter((name) => existingNames.has(name))
+  }
+
+  async function importFiles(
+    files: readonly File[],
+    strategy: DuplicateStrategy,
+  ): Promise<ImportResult> {
+    const markdownFiles = files.filter((file) => /\.md$/i.test(file.name))
+    const failed: ImportResult['failed'] = files
+      .filter((file) => !/\.md$/i.test(file.name))
+      .map((file) => ({ filename: file.name, message: '仅支持 .md 文件。' }))
+
+    const sortedFiles = sortFilesNaturally([...markdownFiles])
+    const duplicates: string[] = []
+    let imported = 0
+
+    for (const file of sortedFiles) {
+      try {
+        const text = await file.text()
+        const design = parseTeachingDesign(file.name, text)
+
+        const existingIndex = book.value.designs.findIndex(
+          (existing) => existing.originalFilename === file.name,
+        )
+
+        if (existingIndex !== -1) {
+          duplicates.push(file.name)
+          if (strategy === 'replace') {
+            book.value.designs.splice(existingIndex, 1, design)
+          } else {
+            book.value.designs.push(design)
+          }
+        } else {
+          book.value.designs.push(design)
+        }
+
+        imported++
+      } catch (error) {
+        failed.push({
+          filename: file.name,
+          message: error instanceof Error ? error.message : '解析失败。',
+        })
+      }
+    }
+
+    if (imported > 0 && book.value.selectedId === 'cover' && book.value.designs.length > 0) {
+      book.value.selectedId = book.value.designs[0]!.id
+    }
+
+    if (imported > 0) {
+      touch()
+    }
+
+    return { imported, failed, duplicates }
+  }
+
+  function selectPage(id: 'cover' | DesignId): void {
+    book.value.selectedId = id
+  }
+
+  function moveDesign(from: number, to: number): void {
+    const designs = book.value.designs
+    if (from < 0 || from >= designs.length || to < 0 || to >= designs.length) {
+      return
+    }
+    const [moved] = designs.splice(from, 1)
+    designs.splice(to, 0, moved!)
+    touch()
+  }
+
+  function removeDesign(id: DesignId): void {
+    const designs = book.value.designs
+    const index = designs.findIndex((design) => design.id === id)
+    if (index === -1) {
+      return
+    }
+    designs.splice(index, 1)
+
+    if (book.value.selectedId === id) {
+      book.value.selectedId = designs[index]?.id ?? designs[index - 1]?.id ?? 'cover'
+    }
+
+    touch()
+  }
+
+  function updateCover(patch: Partial<BookCover>): void {
+    Object.assign(book.value.cover, patch)
+    touch()
+  }
+
+  function updateDesign(id: DesignId, updater: (design: TeachingDesign) => void): void {
+    const design = book.value.designs.find((candidate) => candidate.id === id)
+    if (!design) {
+      return
+    }
+    updater(design)
+    touch()
+  }
+
+  function restore(restored: TeachingBook): void {
+    book.value = restored
+  }
+
+  function clearBook(): void {
+    book.value = createEmptyBook()
+  }
+
+  return {
+    book,
+    saveStatus,
+    lastError,
+    pendingDuplicateFiles,
+    selectedDesign,
+    hasDesigns,
+    warningCount,
+    importFiles,
+    detectDuplicates,
+    selectPage,
+    moveDesign,
+    removeDesign,
+    updateCover,
+    updateDesign,
+    restore,
+    clearBook,
+  }
+}