import 'comicland/comicland_source.dart';
import 'mangaread/mangaread_source.dart';
import 'mangatown/mangatown_source.dart';
import 'source.dart';
import 'source_flags.dart';

class SourceRegistry {
  SourceRegistry({
    Set<SourceId>? enabled,
    ComicSource? comicLand,
    ComicSource? mangaRead,
    ComicSource? mangaTown,
  }) : _sources = _build(
          enabled ?? enabledSourceIds(),
          comicLand: comicLand,
          mangaRead: mangaRead,
          mangaTown: mangaTown,
        );

  final Map<SourceId, ComicSource> _sources;

  static Map<SourceId, ComicSource> _build(
    Set<SourceId> enabled, {
    ComicSource? comicLand,
    ComicSource? mangaRead,
    ComicSource? mangaTown,
  }) {
    final map = <SourceId, ComicSource>{};
    for (final id in enabled) {
      switch (id) {
        case SourceId.comicland:
          map[id] = comicLand ?? ComicLandSource();
        case SourceId.mangaread:
          map[id] = mangaRead ?? MangaReadSource();
        case SourceId.mangatown:
          map[id] = mangaTown ?? MangaTownSource();
      }
    }
    if (map.isEmpty) {
      map[SourceId.comicland] = comicLand ?? ComicLandSource();
    }
    return map;
  }

  List<ComicSource> get all {
    // Stable order matching SourceId declaration.
    return SourceId.values
        .where(_sources.containsKey)
        .map((id) => _sources[id]!)
        .toList(growable: false);
  }

  bool get hasMultiple => _sources.length > 1;

  ComicSource get(SourceId id) {
    final s = _sources[id];
    if (s == null) {
      throw StateError('Source not enabled in this build: $id');
    }
    return s;
  }

  bool isEnabled(SourceId id) => _sources.containsKey(id);

  ComicSource get defaultSource => all.first;
}