import 'package:drift/native.dart';
import 'package:flutter_test/flutter_test.dart';
import 'package:melo/library/database.dart';
import 'package:melo/library/playlist_service.dart';

void main() {
  late MeloDb db;
  late PlaylistService service;

  setUp(() {
    db = MeloDb(NativeDatabase.memory());
    service = PlaylistService(db);
  });

  tearDown(() async => db.close());

  test('createPlaylist delegates to db and notifies listeners', () async {
    var notified = false;
    service.addListener(() => notified = true);

    await service.createPlaylist('Road Trip');

    final playlists = await db.watchPlaylists().first;
    expect(playlists.length, 1);
    expect(playlists.first.name, 'Road Trip');
    expect(notified, true);
  });

  test('toggleFavorite delegates to db and notifies listeners', () async {
    await db.into(db.songs).insert(SongsCompanion.insert(
      id: 'song-1', path: '/a.mp3', title: 'A', dateAddedMs: 0, updatedAtMs: 0,
    ));

    var notified = false;
    service.addListener(() => notified = true);

    await service.toggleFavorite('song-1');

    expect(await db.watchIsFavorite('song-1').first, true);
    expect(notified, true);
  });

  test('reorderAll schreibt lückenlose Positionen 0..N-1 in neuer Reihenfolge', () async {
    final playlistId = await db.createPlaylist('Mix');
    for (final id in ['song-1', 'song-2', 'song-3']) {
      await db.into(db.songs).insert(SongsCompanion.insert(
        id: id, path: '/$id.mp3', title: id, dateAddedMs: 0, updatedAtMs: 0,
      ));
    }
    // Ursprüngliche (evtl. lückenhafte) Positionen.
    await db.addSongToPlaylist(playlistId, 'song-1', 0);
    await db.addSongToPlaylist(playlistId, 'song-2', 5);
    await db.addSongToPlaylist(playlistId, 'song-3', 9);

    var notified = false;
    service.addListener(() => notified = true);

    await service.reorderAll(playlistId, ['song-3', 'song-1', 'song-2']);

    final songs = await db.watchPlaylistSongs(playlistId).first;
    expect(songs.map((s) => s.id).toList(), ['song-3', 'song-1', 'song-2']);
    expect(notified, true);
  });
}