feat(preferences): section langues a telecharger (defaut fr+en), transcripts filtres cote serveur et watch

server/db.mjs

@@ -123,6 +123,7 @@ if (schemaFile && fs.existsSync(schemaFile)) {
     const colsPrefs = db.prepare(`PRAGMA table_info(user_preferences)`).all();
     const have = new Set(colsPrefs.map(c => c.name));
     if (!have.has('default_providers')) db.exec(`ALTER TABLE user_preferences ADD COLUMN default_providers TEXT`);
+    if (!have.has('download_languages')) db.exec(`ALTER TABLE user_preferences ADD COLUMN download_languages TEXT`);
   } catch {}
 })();
 
@@ -144,11 +145,45 @@ export function insertUser({ id, username, email, passwordHash }) {
   db.prepare(`INSERT INTO users (id, username, email, password_hash, is_active, created_at, updated_at)
               VALUES (@id, @username, @email, @passwordHash, 1, @ts, @ts)`).run({ id, username, email, passwordHash, ts });
   // Default preferences row (default_providers NULL = no multi-provider preference yet)
-  db.prepare(`INSERT INTO user_preferences (user_id, language, default_provider, default_providers, theme, video_quality, region, version, updated_at)
-              VALUES (@id, 'en', 'youtube', NULL, 'system', 'auto', 'US', 1, @ts)`).run({ id, ts });
+  db.prepare(`INSERT INTO user_preferences (user_id, language, default_provider, default_providers, download_languages, theme, video_quality, region, version, updated_at)
+              VALUES (@id, 'en', 'youtube', NULL, @dl, 'system', 'auto', 'US', 1, @ts)`).run({ id, ts, dl: JSON.stringify(DEFAULT_DOWNLOAD_LANGUAGES) });
 }// Sanitize a defaultProviders list: keep only known provider ids.
 const KNOWN_PROVIDER_IDS = ['yt', 'dm', 'tw', 'pt', 'od', 'ru'];
 
+// Langues de sous-titres/transcripts proposées dans les préférences.
+// Défaut : français + anglais uniquement.
+export const DEFAULT_DOWNLOAD_LANGUAGES = ['fr', 'en'];
+export const SUPPORTED_DOWNLOAD_LANGUAGES = [
+  'fr', 'en', 'es', 'de', 'it', 'pt', 'nl', 'pl',
+  'ru', 'ar', 'zh', 'ja', 'hi', 'ko',
+];
+
+function sanitizeDownloadLanguages(value) {
+  let arr = value;
+  // Accept JSON string (from DB) or array (from API patch)
+  if (typeof arr === 'string') {
+    try { arr = JSON.parse(arr); } catch { arr = []; }
+  }
+  if (!Array.isArray(arr)) arr = [];
+  const cleaned = arr
+    .map(v => String(v || '').trim().toLowerCase().replace(/_/g, '-').split('-')[0])
+    .filter(v => /^[a-z]{2,3}$/.test(v) && SUPPORTED_DOWNLOAD_LANGUAGES.includes(v));
+  // Deduplicate, preserve order
+  return Array.from(new Set(cleaned));
+}
+
+function parseDownloadLanguagesForApi(stored) {
+  // NULL (ancienne ligne) = défaut fr+en ; '[]' explicite = aucune langue.
+  if (stored == null) return [...DEFAULT_DOWNLOAD_LANGUAGES];
+  try {
+    const parsed = JSON.parse(stored);
+    if (!Array.isArray(parsed)) return [...DEFAULT_DOWNLOAD_LANGUAGES];
+    return sanitizeDownloadLanguages(parsed);
+  } catch {
+    return [...DEFAULT_DOWNLOAD_LANGUAGES];
+  }
+}
+
 function sanitizeDefaultProviders(value) {
   let arr = value;
   // Accept JSON string (from DB) or array (from API patch)
@@ -169,6 +204,11 @@ export function upsertPreferences(userId, patch) {
   if (patch.defaultProviders !== undefined) {
     defaultProviders = sanitizeDefaultProviders(patch.defaultProviders);
   }
+  // Normalize the download/subtitle languages if provided (fr+en par défaut)
+  let downloadLanguages = undefined;
+  if (patch.downloadLanguages !== undefined) {
+    downloadLanguages = sanitizeDownloadLanguages(patch.downloadLanguages);
+  }
 
   const current = db.prepare('SELECT * FROM user_preferences WHERE user_id = ?').get(userId);
   if (!current) {
@@ -178,23 +218,33 @@ export function upsertPreferences(userId, patch) {
       default_providers: defaultProviders !== undefined
         ? (defaultProviders.length ? JSON.stringify(defaultProviders) : null)
         : null,
+      download_languages: downloadLanguages !== undefined
+        ? JSON.stringify(downloadLanguages)
+        : JSON.stringify(DEFAULT_DOWNLOAD_LANGUAGES),
       theme: patch.theme ?? 'system',
       video_quality: patch.videoQuality ?? 'auto',
       region: patch.region ?? 'US',
       version: 1,
     };
-    db.prepare(`INSERT INTO user_preferences (user_id, language, default_provider, default_providers, theme, video_quality, region, version, updated_at)
-                VALUES (@userId, @language, @default_provider, @default_providers, @theme, @video_quality, @region, @version, @updated_at)`)
+    db.prepare(`INSERT INTO user_preferences (user_id, language, default_provider, default_providers, download_languages, theme, video_quality, region, version, updated_at)
+                VALUES (@userId, @language, @default_provider, @default_providers, @download_languages, @theme, @video_quality, @region, @version, @updated_at)`)
       .run({ userId, ...merged, updated_at: nowIso() });
   } else {
     const storedList = current.default_providers;
     const nextList = defaultProviders !== undefined
       ? (defaultProviders.length ? JSON.stringify(defaultProviders) : null)
       : storedList;
+    const storedDl = Object.prototype.hasOwnProperty.call(current, 'download_languages')
+      ? current.download_languages
+      : undefined;
+    const nextDl = downloadLanguages !== undefined
+      ? JSON.stringify(downloadLanguages)
+      : (storedDl !== undefined ? storedDl : JSON.stringify(DEFAULT_DOWNLOAD_LANGUAGES));
     const merged = {
       language: patch.language ?? current.language,
       default_provider: patch.defaultProvider ?? current.default_provider,
       default_providers: nextList,
+      download_languages: nextDl,
       theme: patch.theme ?? current.theme,
       video_quality: patch.videoQuality ?? current.video_quality,
       region: patch.region ?? current.region,
@@ -203,6 +253,7 @@ export function upsertPreferences(userId, patch) {
     };
     db.prepare(`UPDATE user_preferences
                 SET language=@language, default_provider=@default_provider, default_providers=@default_providers,
+                    download_languages=@download_languages,
                     theme=@theme, video_quality=@video_quality, region=@region, version=@version, updated_at=@updated_at
                 WHERE user_id=@userId`)
       .run({ userId, ...merged });
@@ -211,6 +262,7 @@ export function upsertPreferences(userId, patch) {
 
 export function getPreferences(userId) {
   return db.prepare(`SELECT language, default_provider AS defaultProvider, default_providers AS defaultProviders,
+                            download_languages AS downloadLanguages,
                             theme, video_quality AS videoQuality, region, version, updated_at
                      FROM user_preferences WHERE user_id = ?`).get(userId);
 }
@@ -222,7 +274,11 @@ export function getPreferencesForApi(userId) {
   if (prefs.defaultProviders) {
     try { list = JSON.parse(prefs.defaultProviders); } catch { list = null; }
   }
-  return { ...prefs, defaultProviders: Array.isArray(list) ? list : null };
+  return {
+    ...prefs,
+    defaultProviders: Array.isArray(list) ? list : null,
+    downloadLanguages: parseDownloadLanguagesForApi(prefs.downloadLanguages),
+  };
 }
 
 export function insertSession({ id, userId, refreshTokenHash, isRemember, userAgent, deviceInfo, ip, expiresAt }) {