initiation librodrome

app/composables/useBookData.ts

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+import yaml from 'yaml'
+import type { Song } from '~/types/song'
+import type { ChapterSongLink, BookConfig } from '~/types/book'
+
+let _configCache: BookConfig | null = null
+
+async function loadConfig(): Promise<BookConfig> {
+  if (_configCache) return _configCache
+
+  const raw = await import('~/data/librodrome.config.yml?raw').then(m => m.default)
+  const parsed = yaml.parse(raw)
+
+  _configCache = {
+    title: parsed.book.title,
+    author: parsed.book.author,
+    description: parsed.book.description,
+    coverImage: parsed.book.coverImage,
+    chapters: [],
+    songs: parsed.songs as Song[],
+    chapterSongs: parsed.chapterSongs as ChapterSongLink[],
+    defaultPlaylistOrder: parsed.defaultPlaylistOrder as string[],
+  }
+
+  return _configCache
+}
+
+export function useBookData() {
+  const config = ref<BookConfig | null>(null)
+  const isLoaded = ref(false)
+
+  async function init() {
+    if (isLoaded.value) return
+    config.value = await loadConfig()
+    isLoaded.value = true
+  }
+
+  function getSongs(): Song[] {
+    return config.value?.songs ?? []
+  }
+
+  function getSongById(id: string): Song | undefined {
+    return config.value?.songs.find(s => s.id === id)
+  }
+
+  function getChapterSongs(chapterSlug: string): Song[] {
+    if (!config.value) return []
+    const links = config.value.chapterSongs.filter(cs => cs.chapterSlug === chapterSlug)
+    return links
+      .map(link => config.value!.songs.find(s => s.id === link.songId))
+      .filter((s): s is Song => !!s)
+  }
+
+  function getPrimarySong(chapterSlug: string): Song | undefined {
+    if (!config.value) return undefined
+    const link = config.value.chapterSongs.find(
+      cs => cs.chapterSlug === chapterSlug && cs.primary,
+    )
+    if (!link) return undefined
+    return config.value.songs.find(s => s.id === link.songId)
+  }
+
+  function getChapterSongLinks(chapterSlug: string): ChapterSongLink[] {
+    return config.value?.chapterSongs.filter(cs => cs.chapterSlug === chapterSlug) ?? []
+  }
+
+  function getPlaylistOrder(): Song[] {
+    if (!config.value) return []
+    return config.value.defaultPlaylistOrder
+      .map(id => config.value!.songs.find(s => s.id === id))
+      .filter((s): s is Song => !!s)
+  }
+
+  function getBookMeta() {
+    if (!config.value) return null
+    return {
+      title: config.value.title,
+      author: config.value.author,
+      description: config.value.description,
+      coverImage: config.value.coverImage,
+    }
+  }
+
+  return {
+    config,
+    isLoaded,
+    init,
+    getSongs,
+    getSongById,
+    getChapterSongs,
+    getPrimarySong,
+    getChapterSongLinks,
+    getPlaylistOrder,
+    getBookMeta,
+  }
+}