/// ============================================================
/// 【QuestionModel】题目数据模型（纯 Dart 可变类）
///
/// 设计说明（对应用户口型：纯 Dart 可变类、全量保留原字段名、
/// 手写 fromJson/toJson、不用 Isar/codegen）：
///   - 内部以 `Map<String, dynamic>` 承载全部字段（后端字段 + 解析器
///     动态产出 + 运行时字段），字段名与 Vue 端完全一致；
///   - 解析器（core/utils/question/）直接操作 Map，本类提供类型化
///     get/set 给页面与控制器使用；
///   - childs/subQuestions 每次访问都基于同一批 Map 生成包装对象，
///     因此通过子模型的写操作会落到原始 Map 上（等价 JS 引用语义）。
/// ============================================================
library;

class QuestionModel {
  QuestionModel(this.m);

  factory QuestionModel.fromJson(Map<String, dynamic> json) =>
      QuestionModel(Map<String, dynamic>.from(json));

  /// 原始数据（解析后的 Map，toJson 即提交回这个结构）
  final Map<String, dynamic> m;

  Map<String, dynamic> toJson() => m;

  @override
  String toString() => 'QuestionModel(id: $id, questionTypes: $questionTypes)';

  // ---------------- 基础读写 ----------------

  bool has(String key) => m.containsKey(key) && m[key] != null;

  T? get<T>(String key) => m[key] is T ? m[key] as T : null;

  void set(String key, dynamic value) => m[key] = value;

  String str(String key, [String def = '']) {
    final v = m[key];
    return v == null ? def : '$v';
  }

  int? intOf(String key) {
    final v = m[key];
    if (v is num) return v.toInt();
    if (v == null) return null;
    return int.tryParse('$v');
  }

  bool boolOf(String key, [bool def = false]) =>
      m[key] == true ? true : (m[key] == false ? false : def);

  /// 注意：返回的是原 Map 的 cast 视图（非拷贝），
  /// 这样子模型上的所有写操作都会落回原始 JSON Map（等价 JS 引用语义）。
  List<Map<String, dynamic>> mapList(String key) {
    final v = m[key];
    if (v is! List) return const [];
    return [
      for (final e in v)
        if (e is Map) e.cast<String, dynamic>(),
    ];
  }

  // ---------------- 业务字段（原名） ----------------

  String get id => str('id');
  set id(dynamic v) => m['id'] = v;

  String get questionId => str('questionId');
  set questionId(dynamic v) => m['questionId'] = v;

  dynamic get questionTypeId => m['questionTypeId'];
  set questionTypeId(dynamic v) => m['questionTypeId'] = v;

  String get questionTypeName => str('questionTypeName');
  set questionTypeName(String v) => m['questionTypeName'] = v;

  dynamic get questionTypeCode => m['questionTypeCode'];

  bool get isObjective => boolOf('isObjective');
  bool get isSelect => boolOf('isSelect');

  String get stem => str('stem');
  set stem(String v) => m['stem'] = v;

  String get answer => str('answer');
  set answer(String v) => m['answer'] = v;

  String get correctAnswer => str('correctAnswer');
  set correctAnswer(String v) => m['correctAnswer'] = v;

  String get userAnswer => str('userAnswer');
  set userAnswer(dynamic v) => m['userAnswer'] = v;

  /// 部分接口字段（与 userAnswer 互为兜底）
  String get myAnswer => str('myAnswer');
  set myAnswer(dynamic v) => m['myAnswer'] = v;

  /// Vue 端 child.userAnswer || child.myAnswer
  String get effectiveAnswer {
    final u = m['userAnswer'];
    return u != null && '$u'.isNotEmpty ? '$u' : myAnswer;
  }

  int? get answerStatus => intOf('answerStatus');
  set answerStatus(dynamic v) => m['answerStatus'] = v;

  /// 解析（字符串或 {analysis: '...'}）
  dynamic get answerAnalysisRaw => m['answerAnalysis'];
  set answerAnalysisRaw(dynamic v) => m['answerAnalysis'] = v;

  String get answerAnalysisText {
    final v = m['answerAnalysis'];
    if (v is Map) return '${v['analysis'] ?? ''}';
    return v == null ? '' : '$v';
  }

  Map<String, dynamic>? get answerAnalysisVideo {
    final v = m['answerAnalysisVideo'];
    return v is Map ? Map<String, dynamic>.from(v) : null;
  }

  List<Map<String, dynamic>> get audios => mapList('audios');
  List<Map<String, dynamic>> get videos => mapList('videos');

  int get planTimeSecond => intOf('planTimeSecond') ?? 0;
  set planTimeSecond(dynamic v) => m['planTimeSecond'] = v;

  /// 运行时：本地剩余秒缓存
  int? get newPlanTimeSecond => intOf('NewPlanTimeSecond');
  set newPlanTimeSecond(int? v) => m['NewPlanTimeSecond'] = v;

  /// 运行时：本题建议时长是否已完成
  bool get isFinishPlanTime => boolOf('ISFinishPlanTime');
  set isFinishPlanTime(bool v) => m['ISFinishPlanTime'] = v;

  int get answerTimeSecond => intOf('answerTimeSecond') ?? 0;

  dynamic get score => m['score'];
  dynamic get userScore => m['userScore'];

  bool get isCollect => boolOf('isCollect');
  set isCollect(bool v) => m['isCollect'] = v;

  dynamic get collectId => m['collectId'];
  set collectId(dynamic v) => m['collectId'] = v;

  bool get isWrongCollect => boolOf('isWrongCollect');
  set isWrongCollect(bool v) => m['isWrongCollect'] = v;

  dynamic get wrongCollectId => m['wrongCollectId'];
  set wrongCollectId(dynamic v) => m['wrongCollectId'] = v;

  bool get hasChild => boolOf('hasChild');

  List<QuestionModel> get childs =>
      mapList('childs').map(QuestionModel.new).toList();

  List<dynamic> get indexes =>
      m['indexes'] is List ? m['indexes'] as List : const [];

  /// 笔记图片（{id,url,thumbnailUrl} 等）
  List<Map<String, dynamic>> get notes => mapList('notes');
  set notes(List<dynamic> v) => m['notes'] = v;

  String get source => str('source');

  String? get wrongReason =>
      m['wrongReason'] == null ? null : '${m['wrongReason']}';
  String? get wrongAdvice =>
      m['wrongAdvice'] == null ? null : '${m['wrongAdvice']}';

  bool get isUploadNotes => boolOf('isUploadNotes');

  /// 加载时注入：0 输入框 / 1 图片作答
  int get isFillblankItemUpload => intOf('iSFilllankItemUpload') ?? 0;
  set isFillblankItemUpload(dynamic v) => m['iSFilllankItemUpload'] = v;

  dynamic get baseSubjectId => m['baseSubjectId'];
  set baseSubjectId(dynamic v) => m['baseSubjectId'] = v;

  int? get sort => intOf('sort');
  set sort(dynamic v) => m['sort'] = v;

  int? get wrongSort => intOf('wrongSort');
  set wrongSort(dynamic v) => m['wrongSort'] = v;

  /// appendExamQuestionChildOptionStatus 注入
  bool get hasOptionChildrenQuestion => boolOf('hasOptionChildrenQuestion');
  set hasOptionChildrenQuestion(bool v) =>
      m['hasOptionChildrenQuestion'] = v;

  List<QuestionModel> get subQuestions =>
      mapList('subQuestions').map(QuestionModel.new).toList();

  List<QuestionModel> get bkTagMetaList =>
      mapList('bkTagMetaList').map(QuestionModel.new).toList();

  /// 选项 [{optionLabel, options}]
  List<Map<String, String>> get options {
    final v = m['options'];
    if (v is! List) return const [];
    return v.whereType<Map>().map((e) {
      return {
        'optionLabel': '${e['optionLabel'] ?? ''}',
        'options': '${e['options'] ?? ''}',
      };
    }).toList();
  }

  String get questionTypes => str('questionTypes');
  set questionTypes(String v) => m['questionTypes'] = v;

  String get analysis => str('analysis');
  set analysis(String v) => m['analysis'] = v;

  /// 解析时保留的原始对象
  Map<String, dynamic>? get raw {
    final v = m['raw'];
    return v is Map ? Map<String, dynamic>.from(v) : null;
  }

  /// 运行时：进入本题时间（本地 ISO）
  String? get startTime => m['startTime'] as String?;
  set startTime(String? v) => m['startTime'] = v;

  /// 运行时：离开本题时间（本地 ISO）
  String? get endTime => m['endTime'] as String?;
  set endTime(String? v) => m['endTime'] = v;

  /// 子题号（如 "1.1"，subQuestions 元素自带）
  dynamic get index => m['index'];

  /// 运行时：列表下标
  int? get currentIndex => intOf('currentIndex');
  set currentIndex(int v) => m['currentIndex'] = v;

  // ---------------- 便捷方法 ----------------

  QuestionModel? childAt(int index) {
    final list = mapList('childs');
    if (index < 0 || index >= list.length) return null;
    return QuestionModel(list[index]);
  }

  QuestionModel? subAt(int index) {
    final list = mapList('subQuestions');
    if (index < 0 || index >= list.length) return null;
    return QuestionModel(list[index]);
  }

  /// 重置本题及其子题的 startTime（对应 Vue resetCurrentQuestionStartTime）
  void resetStartTime(String isoNow) {
    m['startTime'] = isoNow;
    for (final key in ['subQuestions', 'childs']) {
      final v = m[key];
      if (v is List) {
        for (final c in v) {
          if (c is Map) c['startTime'] = isoNow;
        }
      }
    }
  }
}

/// 选项取值辅助
String optionLabelOf(Map<String, String> option) => option['optionLabel'] ?? '';
String optionContentOf(Map<String, String> option) => option['options'] ?? '';