import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import '../shared/cover.dart';
import 'database.dart';
import 'song_grouping.dart';
import 'song_list.dart';

/// Bibliotheks-Tab: Album-Übersicht, gruppiert aus [MeloDb.watchSongs].
class AlbumListScreen extends StatelessWidget {
  const AlbumListScreen({super.key});

  @override
  Widget build(BuildContext context) {
    final db = context.read<MeloDb>();
    return StreamBuilder<List<Song>>(
      stream: db.watchSongs(),
      builder: (context, snapshot) {
        final songs = snapshot.data ?? const [];
        if (songs.isEmpty) {
          return const Center(
            child: Text('Keine Alben', style: TextStyle(color: Colors.white54)),
          );
        }
        final grouped = groupByAlbum(songs);
        final albums = grouped.keys.toList();
        return ListView.builder(
          itemCount: albums.length,
          itemBuilder: (context, i) {
            final album = albums[i];
            final albumSongs = grouped[album]!;
            final coverPath = albumSongs.first.coverPath;
            return ListTile(
              leading: CoverImage(
                artUri: coverPath != null ? Uri.file(coverPath) : null,
                size: 48,
                radius: 6,
              ),
              title: Text(album, maxLines: 1, overflow: TextOverflow.ellipsis),
              subtitle: Text('${albumArtistLabel(albumSongs)} · ${albumSongs.length} Songs',
                  maxLines: 1, overflow: TextOverflow.ellipsis),
              onTap: () => Navigator.push(
                context,
                MaterialPageRoute(
                  builder: (_) => _AlbumSongsScreen(album: album, songs: albumSongs),
                ),
              ),
            );
          },
        );
      },
    );
  }
}

/// Zeigt alle Songs eines Albums.
class _AlbumSongsScreen extends StatelessWidget {
  const _AlbumSongsScreen({required this.album, required this.songs});
  final String album;
  final List<Song> songs;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(album)),
      body: SongList(songs),
    );
  }
}