import 'source.dart';

/// Compile-time source gate: `--dart-define=SOURCES=comicland,mangaread,mangatown`
/// or `--dart-define=SOURCES=all`.
///
/// Unset / invalid → ComicLand only. Default is **not** all sources.
const String kSourcesDefine = String.fromEnvironment(
  'SOURCES',
  defaultValue: 'comicland',
);

/// Parses [raw] into enabled [SourceId]s.
///
/// - Token `all` (case-insensitive) enables every [SourceId].
/// - Unknown tokens ignored.
/// - Empty result falls back to `{SourceId.comicland}`.
Set<SourceId> parseEnabledSourceIds([String raw = kSourcesDefine]) {
  final parts = raw.split(',').map((p) => p.trim().toLowerCase()).where(
        (p) => p.isNotEmpty,
      );
  for (final part in parts) {
    if (part == 'all') {
      return SourceId.values.toSet();
    }
  }
  final out = <SourceId>{};
  for (final part in parts) {
    final id = SourceId.tryParse(part);
    if (id != null) out.add(id);
  }
  if (out.isEmpty) {
    return {SourceId.comicland};
  }
  return out;
}

Set<SourceId> enabledSourceIds() => parseEnabledSourceIds();