enum SourceLanguage {
  de('Deutsch', '🇩🇪'),
  en('English', '🇬🇧');

  const SourceLanguage(this.label, this.flag);

  final String label;
  final String flag;
}

/// What a Source's articles are for; see GLOSSARY.md. Each kind has its own
/// section in the app and its own time window.
enum SourceKind {
  news('News'),
  learning('Learning'),
  fun('Fun');

  const SourceKind(this.label);

  final String label;
}

/// A Source of any [kind]; see GLOSSARY.md.
class Source {
  const Source({
    required this.id,
    required this.name,
    required this.feedUrl,
    required this.homepage,
    required this.language,
    this.kind = SourceKind.news,
    this.description = '',
    this.enabledByDefault = false,
    this.isCustom = false,
    this.checkPaywallOnPage = false,
  });

  final String id;
  final String name;
  final String feedUrl;
  final String homepage;
  final SourceLanguage language;
  final SourceKind kind;
  final String description;
  final bool enabledByDefault;
  final bool isCustom;

  /// Paid articles are only marked inside the page (schema.org), not in the
  /// feed, so each new article page is checked once.
  final bool checkPaywallOnPage;

  Map<String, dynamic> toJson() => {
        'id': id,
        'name': name,
        'feedUrl': feedUrl,
        'homepage': homepage,
        'language': language.name,
        'kind': kind.name,
        'description': description,
      };

  factory Source.custom(Map<String, dynamic> json) => Source(
        id: json['id'] as String,
        name: json['name'] as String,
        feedUrl: json['feedUrl'] as String,
        homepage: json['homepage'] as String? ?? '',
        language: SourceLanguage.values.byName(json['language'] as String? ?? 'en'),
        // Custom sources saved before kinds existed are News sources.
        kind: SourceKind.values.asNameMap()[json['kind']] ?? SourceKind.news,
        description: json['description'] as String? ?? '',
        isCustom: true,
      );
}