Dustin
bd692d4682
## Fix (Code-Review Finding 2, HIGH) - DbHelper.songZurPlaylist: INSERT OR IGNORE (ConflictAlgorithm.ignore) — Doppel-Tap-Race verletzt PRIMARY KEY (playlist_id, song_id) nicht mehr - FavoritenService.umschalten: gibt neuen Status zurück, try/catch mit MeloLogger, Zustand nach Fehler aus DB neu geladen statt blind geflippt - NowPlayingScreen._toggleFavorit: In-Flight-Guard _toggleLaeuft gegen parallele Toggles + Statusübernahme aus DB (Quelle der Wahrheit)
77 lines
2.6 KiB
Dart
77 lines
2.6 KiB
Dart
import 'package:flutter/foundation.dart';
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import '../database/db_helper.dart';
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import '../models/song.dart';
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import 'melo_logger.dart';
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class FavoritenService {
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static final FavoritenService _instanz = FavoritenService._();
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factory FavoritenService() => _instanz;
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FavoritenService._();
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final DbHelper _db = DbHelper();
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int? _favoritenPlaylistId;
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int? get favoritenId => _favoritenPlaylistId;
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Future<void> init() async {
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final playlists = await _db.allePlaylists();
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final vorhanden = playlists.where((p) => p['name'] == '⭐ Favoriten').toList();
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if (vorhanden.isNotEmpty) {
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_favoritenPlaylistId = vorhanden.first['id'] as int;
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} else {
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_favoritenPlaylistId = await _db.playlistErstellen('⭐ Favoriten');
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}
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}
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Future<bool> istFavorit(int songId) async {
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if (_favoritenPlaylistId == null) return false;
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final songs = await _db.songsDerPlaylist(_favoritenPlaylistId!);
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return songs.any((s) => s.id == songId);
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}
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/// Schaltet den Favoriten-Status um und gibt den NEUEN Status zurück
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/// (true = jetzt Favorit). Bei Fehlern (z. B. DB-Race) wird der Zustand
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/// aus der DB neu geladen statt blind geflippt — kein unhandled Throw.
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Future<bool> umschalten(int songId) async {
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if (_favoritenPlaylistId == null) return false;
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try {
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if (await istFavorit(songId)) {
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await _db.songAusPlaylistEntfernen(_favoritenPlaylistId!, songId);
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return false;
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} else {
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final songs = await _db.songsDerPlaylist(_favoritenPlaylistId!);
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// INSERT OR IGNORE in songZurPlaylist fängt Doppel-Tap-Races ab
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await _db.songZurPlaylist(_favoritenPlaylistId!, songId, songs.length);
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return true;
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}
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} catch (e) {
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debugPrint('Favoriten-Toggle fehlgeschlagen: $e');
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MeloLogger().fehler('favoriten_toggle', e);
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// Zustand nach Fehler aus der DB synchronisieren (Quelle der Wahrheit)
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return istFavorit(songId);
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}
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}
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Future<List<Song>> alleFavoriten() async {
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if (_favoritenPlaylistId == null) return [];
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return _db.songsDerPlaylist(_favoritenPlaylistId!);
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}
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Future<int> anzahlFavoriten() async {
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if (_favoritenPlaylistId == null) await init();
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if (_favoritenPlaylistId == null) return 0;
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final songs = await _db.songsDerPlaylist(_favoritenPlaylistId!);
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return songs.length;
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}
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Future<Set<int>> favoritenIds() async {
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if (_favoritenPlaylistId == null) return {};
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final d = await _db.db;
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final rows = await d.rawQuery(
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'SELECT song_id FROM playlist_songs WHERE playlist_id = ?',
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[_favoritenPlaylistId],
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);
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return rows.map((r) => r['song_id'] as int).toSet();
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}
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}
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