class ExternalSymbolSource {
  final String author;
  final String work;
  final String excerpt;
  final String fullText;

  const ExternalSymbolSource({
    required this.author,
    required this.work,
    this.excerpt = '',
    this.fullText = '',
  });

  factory ExternalSymbolSource.fromMap(Map<String, dynamic> map) {
    return ExternalSymbolSource(
      author: map['author'] as String? ?? '',
      work: map['work'] as String? ?? '',
      excerpt: map['excerpt'] as String? ?? '',
      fullText: map['full_text'] as String? ?? '',
    );
  }

  Map<String, dynamic> toMap() => {
    'author': author,
    'work': work,
    'excerpt': excerpt,
    'full_text': fullText,
  };
}

class ExternalSymbol {
  final String term;
  final String normalized;
  final String categoryGuess;
  final List<ExternalSymbolSource> sources;
  final List<Map<String, dynamic>> illustrations;

  const ExternalSymbol({
    required this.term,
    required this.normalized,
    this.categoryGuess = 'Внешний академический символ',
    this.sources = const [],
    this.illustrations = const [],
  });

  bool get hasIllustrations => illustrations.isNotEmpty;

  String get primaryAuthor => sources.isNotEmpty ? sources.first.author : '';
  String get primaryWork => sources.isNotEmpty ? sources.first.work : '';
  String get primaryExcerpt => sources.isNotEmpty ? sources.first.excerpt : '';

  factory ExternalSymbol.fromMap(Map<String, dynamic> map) {
    final rawSources = map['sources'] as List<dynamic>? ?? [];
    final rawIlls = map['illustrations'] as List<dynamic>? ?? [];

    return ExternalSymbol(
      term: map['term'] as String? ?? '',
      normalized: map['normalized'] as String? ?? '',
      categoryGuess: map['category_guess'] as String? ?? 'Внешний символ',
      sources: rawSources
          .map((s) => ExternalSymbolSource.fromMap(Map<String, dynamic>.from(s as Map)))
          .toList(),
      illustrations: rawIlls
          .map((i) => Map<String, dynamic>.from(i as Map))
          .toList(),
    );
  }

  Map<String, dynamic> toMap() => {
    'term': term,
    'normalized': normalized,
    'category_guess': categoryGuess,
    'sources': sources.map((s) => s.toMap()).toList(),
    'illustrations': illustrations,
  };
}