feat: remove cover page

src/composables/useTeachingBook.test.ts

@@ -10,15 +10,22 @@ function mockGetBook(data: TeachingBook, id = 'b1'): void {
   vi.mocked(booksApi.getBook).mockResolvedValue({ id, name: '示例整本', updatedAt: data.updatedAt, data })
 }
 
+function createBookWithDesign(filename = '1.md'): { data: TeachingBook; design: ReturnType<typeof createEmptyTeachingDesign> } {
+  const data = createEmptyBook()
+  const design = createEmptyTeachingDesign(filename)
+  data.designs.push(design)
+  data.selectedId = design.id
+  return { data, design }
+}
+
 describe('useTeachingBook', () => {
   beforeEach(() => {
     vi.clearAllMocks()
     vi.useFakeTimers()
   })
 
-  it('loads the book from the API', async () => {
-    const data = createEmptyBook()
-    data.cover.courseName = 'Web 前端开发'
+  it('loads the book from the API without cover state', async () => {
+    const { data } = createBookWithDesign()
     mockGetBook(data)
 
     const store = useTeachingBook('b1')
@@ -26,7 +33,8 @@ describe('useTeachingBook', () => {
 
     expect(booksApi.getBook).toHaveBeenCalledWith('b1')
     expect(store.loadStatus.value).toBe('loaded')
-    expect(store.book.value.cover.courseName).toBe('Web 前端开发')
+    expect(store.book.value).not.toHaveProperty('cover')
+    expect(store.book.value.selectedId).toBe(data.selectedId)
   })
 
   it('sets loadStatus to error when loading fails', async () => {
@@ -82,13 +90,16 @@ describe('useTeachingBook', () => {
   })
 
   it('autosaves the book via the API after the debounce delay', async () => {
-    mockGetBook(createEmptyBook())
+    const { data, design } = createBookWithDesign()
+    mockGetBook(data)
     vi.mocked(booksApi.updateBook).mockResolvedValue({ id: 'b1', name: '示例整本', updatedAt: 'later' })
 
     const store = useTeachingBook('b1')
     await flushPromises()
 
-    store.updateCover({ courseName: '新课程名' })
+    store.updateDesign(design.id, (current) => {
+      current.title = '新课程名'
+    })
     await vi.advanceTimersByTimeAsync(300)
 
     expect(booksApi.updateBook).toHaveBeenCalledWith('b1', store.book.value)
@@ -96,13 +107,16 @@ describe('useTeachingBook', () => {
   })
 
   it('sets saveStatus to error when autosave fails', async () => {
-    mockGetBook(createEmptyBook())
+    const { data, design } = createBookWithDesign()
+    mockGetBook(data)
     vi.mocked(booksApi.updateBook).mockRejectedValue(new Error('保存失败。'))
 
     const store = useTeachingBook('b1')
     await flushPromises()
 
-    store.updateCover({ courseName: '新课程名' })
+    store.updateDesign(design.id, (current) => {
+      current.title = '新课程名'
+    })
     await vi.advanceTimersByTimeAsync(300)
 
     expect(store.saveStatus.value).toBe('error')
@@ -139,10 +153,8 @@ describe('useTeachingBook', () => {
     expect(store.book.value.designs).toHaveLength(0)
   })
 
-  it('clearBook empties designs but keeps the cover', async () => {
-    const data = createEmptyBook()
-    data.cover.courseName = 'Web 前端开发'
-    data.designs.push(createEmptyTeachingDesign('1.md'))
+  it('clearBook empties designs and clears selection', async () => {
+    const { data } = createBookWithDesign()
     mockGetBook(data)
 
     const store = useTeachingBook('b1')
@@ -151,7 +163,22 @@ describe('useTeachingBook', () => {
     store.clearBook()
 
     expect(store.book.value.designs).toEqual([])
-    expect(store.book.value.cover.courseName).toBe('Web 前端开发')
-    expect(store.book.value.selectedId).toBe('cover')
+    expect(store.book.value).not.toHaveProperty('cover')
+    expect(store.book.value.selectedId).toBeNull()
+  })
+
+  it('selects null after removing the last selected lesson', async () => {
+    const { data, design } = createBookWithDesign()
+    mockGetBook(data)
+
+    const store = useTeachingBook('b1')
+    await flushPromises()
+
+    store.removeDesign(design.id)
+    await flushPromises()
+
+    expect(store.book.value.designs).toEqual([])
+    expect(store.book.value.selectedId).toBeNull()
+    expect(store.selectedDesign.value).toBeNull()
   })
 })

src/composables/useTeachingBook.ts

@@ -1,7 +1,6 @@
 import { nextTick, ref, watch, type Ref } from 'vue'
 import {
   createEmptyBook,
-  type BookCover,
   type DesignId,
   type TeachingBook,
   type TeachingDesign,
@@ -38,10 +37,9 @@ export interface TeachingBookStore {
   warningCount: Ref<number>
   importFiles: (files: readonly File[], strategy: DuplicateStrategy) => Promise<ImportResult>
   detectDuplicates: (files: readonly File[]) => string[]
-  selectPage: (id: 'cover' | DesignId) => void
+  selectPage: (id: 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
   clearBook: () => void
   generateLesson: (topic: string) => Promise<GenerateLessonResult>
@@ -67,7 +65,7 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     const current = book.value
     hasDesigns.value = current.designs.length > 0
     selectedDesign.value =
-      current.selectedId === 'cover'
+      current.selectedId === null
         ? null
         : current.designs.find((design) => design.id === current.selectedId) ?? null
     warningCount.value = current.designs.reduce(
@@ -176,7 +174,7 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
       }
     }
 
-    if (imported > 0 && book.value.selectedId === 'cover' && book.value.designs.length > 0) {
+    if (imported > 0 && book.value.selectedId === null && book.value.designs.length > 0) {
       book.value.selectedId = book.value.designs[0]!.id
     }
 
@@ -187,7 +185,7 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     return { imported, failed, duplicates }
   }
 
-  function selectPage(id: 'cover' | DesignId): void {
+  function selectPage(id: DesignId): void {
     book.value.selectedId = id
   }
 
@@ -210,17 +208,12 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     designs.splice(index, 1)
 
     if (book.value.selectedId === id) {
-      book.value.selectedId = designs[index]?.id ?? designs[index - 1]?.id ?? 'cover'
+      book.value.selectedId = designs[index]?.id ?? designs[index - 1]?.id ?? null
     }
 
     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) {
@@ -232,7 +225,7 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
 
   function clearBook(): void {
     book.value.designs = []
-    book.value.selectedId = 'cover'
+    book.value.selectedId = null
     touch()
   }
 
@@ -286,7 +279,6 @@ export function useTeachingBook(bookId: string): TeachingBookStore {
     selectPage,
     moveDesign,
     removeDesign,
-    updateCover,
     updateDesign,
     clearBook,
     generateLesson,