import 'subject.dart';

class KanjiItem extends Subject {
  final List<String> onyomi;
  final List<String> kunyomi;

  KanjiItem({
    required super.id,
    required super.level,
    required super.characters,
    required super.meanings,
    required this.onyomi,
    required this.kunyomi,
  });

  factory KanjiItem.fromSubject(Map<String, dynamic> subj) {
    final commonFields = Subject.parseCommonFields(subj);
    final data = commonFields['data'] as Map<String, dynamic>;
    final List<String> onyomi = <String>[];
    final List<String> kunyomi = <String>[];

    if (data['readings'] != null) {
      for (final r in data['readings'] as List) {
        final typ = r['type'] as String? ?? '';
        final reading = r['reading'] as String? ?? '';
        if (typ == 'onyomi') {
          onyomi.add(_katakanaToHiragana(reading));
        } else if (typ == 'kunyomi') {
          kunyomi.add(reading);
        }
      }
    }

    return KanjiItem(
      id: commonFields['id'] as int,
      level: commonFields['level'] as int,
      characters: commonFields['characters'] as String,
      meanings: commonFields['meanings'] as List<String>,
      onyomi: onyomi,
      kunyomi: kunyomi,
    );
  }
}

String _katakanaToHiragana(String input) {
  final buf = StringBuffer();
  for (final r in input.runes) {
    if (r >= 0x30A1 && r <= 0x30FA) {
      buf.writeCharCode(r - 0x60);
    } else {
      buf.writeCharCode(r);
    }
  }
  return buf.toString();
}