import 'package:ainoval/utils/logger.dart';

/// 小说模型
class Novel {
  Novel({
    required this.id,
    required this.title,
    this.coverUrl= '',
    required this.createdAt,
    required this.updatedAt,
    this.acts = const [],
    this.lastEditedChapterId,
    this.author,
    this.wordCount = 0,
    this.readTime = 0,
    this.version = 1,
    this.contributors = const <String>[],
  });

  /// 从JSON创建Novel实例
  factory Novel.fromJson(Map<String, dynamic> json) {
    AppLogger.v(
        'NovelModel', 'Parsing Novel from JSON: ${json['id']}'); // 添加日志确认进入
    try {
      // --- 这是关键部分 ---
      List<Act> parsedActs = [];
      
      // 处理acts数据 - 优先检查structure.acts路径
      if (json.containsKey('structure') && json['structure'] is Map) {
        final structure = json['structure'] as Map<String, dynamic>;
        
        if (structure.containsKey('acts') && structure['acts'] is List) {
          AppLogger.v('NovelModel',
              'Found "structure.acts" list with ${(structure['acts'] as List).length} items.');
              
          parsedActs = (structure['acts'] as List)
              .map((actJson) {
                if (actJson is Map<String, dynamic>) {
                  // 对列表中的每个元素调用 Act.fromJson
                  return Act.fromJson(actJson);
                } else {
                  // 处理无效数据项
                  AppLogger.w('NovelModel',
                      'Invalid item in "structure.acts" list: $actJson');
                  return null; // 返回null让whereType过滤掉
                }
              })
              .whereType<Act>() // 过滤掉可能的 null 值
              .toList();
              
          AppLogger.v('NovelModel',
              'Successfully parsed ${parsedActs.length} acts from structure.acts.');
        } else {
          AppLogger.w('NovelModel',
              '"structure.acts" field is missing, null, or not a list in JSON for Novel ${json['id']}');
        }
      }
      // 如果在structure中没有找到有效的acts，尝试直接从json的acts字段读取
      else if (json.containsKey('acts') && json['acts'] is List) {
        AppLogger.v('NovelModel',
            'Found direct "acts" list with ${(json['acts'] as List).length} items.');
            
        parsedActs = (json['acts'] as List)
            .map((actJson) {
              if (actJson is Map<String, dynamic>) {
                return Act.fromJson(actJson);
              } else {
                AppLogger.w('NovelModel',
                    'Invalid item in direct "acts" list: $actJson');
                return null;
              }
            })
            .whereType<Act>()
            .toList();
            
        AppLogger.v('NovelModel',
            'Successfully parsed ${parsedActs.length} acts from direct acts field.');
      } else {
        AppLogger.w('NovelModel',
            'No valid acts field found in JSON for Novel ${json['id']}');
      }
      // --- 关键部分结束 ---

      // 解析元数据
      final metadata = json['metadata'] as Map<String, dynamic>? ?? {};
      final wordCount = metadata['wordCount'] is int ? metadata['wordCount'] as int : 0;
      final readTime = metadata['readTime'] is int ? metadata['readTime'] as int : 0;
      final version = metadata['version'] is int ? metadata['version'] as int : 1;
      
      // 处理contributors列表
      List<String> contributors = [];
      if (metadata.containsKey('contributors') && metadata['contributors'] is List) {
        // 尝试转换每个元素为String
        for (var item in metadata['contributors'] as List) {
          if (item is String) {
            contributors.add(item);
          }
        }
      }
      
      // 解析日期
      DateTime createdAt;
      DateTime updatedAt;
      
      try {
        createdAt = json.containsKey('createdAt') && json['createdAt'] is String
            ? DateTime.parse(json['createdAt'] as String)
            : DateTime.now();
      } catch (e) {
        AppLogger.w('NovelModel', '解析createdAt失败，使用当前时间', e);
        createdAt = DateTime.now();
      }
      
      try {
        updatedAt = json.containsKey('updatedAt') && json['updatedAt'] is String
            ? DateTime.parse(json['updatedAt'] as String)
            : DateTime.now();
      } catch (e) {
        AppLogger.w('NovelModel', '解析updatedAt失败，使用当前时间', e);
        updatedAt = DateTime.now();
      }

      // 处理封面URL字段
      String coverUrl = '';
      if (json.containsKey('coverUrl') && json['coverUrl'] is String) {
        coverUrl = json['coverUrl'] as String;
      } else if (json.containsKey('coverImage') && json['coverImage'] is String) {
        // 兼容后端可能使用coverImage字段
        coverUrl = json['coverImage'] as String;
      }
      
      // 创建Novel对象
      return Novel(
        id: json['id'] as String? ?? 'unknown_${DateTime.now().millisecondsSinceEpoch}',
        title: json['title'] as String? ?? '无标题',
        coverUrl: coverUrl,
        createdAt: createdAt,
        updatedAt: updatedAt,
        acts: parsedActs,
        lastEditedChapterId: json['lastEditedChapterId'] as String?,
        author: json['author'] != null
            ? Author.fromJson(json['author'] as Map<String, dynamic>)
            : null,
        wordCount: wordCount,
        readTime: readTime,
        version: version,
        contributors: contributors,
      );
    } catch (e, stackTrace) {
      AppLogger.e('NovelModel', 'Error parsing Novel from JSON: ${json['id']}',
          e, stackTrace);
      // 返回一个基本的空Novel对象，避免应用崩溃
      return Novel(
        id: json['id'] as String? ?? 'error_${DateTime.now().millisecondsSinceEpoch}',
        title: '解析错误 - ${json['title'] ?? '无标题'}',
        coverUrl: '',
        createdAt: DateTime.now(),
        updatedAt: DateTime.now(),
        acts: [],
        wordCount: 0,
      );
    }
  }
  final String id;
  final String title;
  final String coverUrl;
  final DateTime createdAt;
  final DateTime updatedAt;
  final List<Act> acts;
  final String? lastEditedChapterId; // 上次编辑的章节ID
  final Author? author; // 作者信息
  final int wordCount; // 总字数（来自元数据）
  final int readTime; // 估计阅读时间（分钟）
  final int version; // 文档版本号
  final List<String> contributors; // 贡献者列表

  /// 计算小说总字数（如果需要动态计算）
  int calculateWordCount() {
    int totalWordCount = 0;
    for (final act in acts) {
      for (final chapter in act.chapters) {
        for (final scene in chapter.scenes) {
          totalWordCount += scene.wordCount;
        }
      }
    }
    return totalWordCount;
  }

  /// 计算小说总场景数（考虑 sceneIds 字段）
  int getSceneCount() {
    int totalSceneCount = 0;
    //AppLogger.d('Novel', '开始计算场景总数');
    
    for (final act in acts) {
      int actSceneCount = 0;
      for (final chapter in act.chapters) {
        // 使用 sceneCount 属性，它会返回 scenes 和 sceneIds 中的较大值
        int chapterSceneCount = chapter.sceneCount;
        actSceneCount += chapterSceneCount;
        //AppLogger.d('Novel', '章节 ${chapter.id} 场景数: scenes=${chapter.scenes.length}, sceneIds=${chapter.sceneIds.length}, 取较大值=${chapterSceneCount}');
      }
      totalSceneCount += actSceneCount;
      //AppLogger.d('Novel', '卷 ${act.id} 场景总数: $actSceneCount');
    }
    
    //AppLogger.d('Novel', '小说场景总数: $totalSceneCount');
    return totalSceneCount;
  }

  /// 计算小说总章节数
  int getChapterCount() {
    int totalChapterCount = 0;
    for (final act in acts) {
      totalChapterCount += act.chapters.length;
    }
    return totalChapterCount;
  }

  /// 计算小说总卷数
  int getActCount() {
    return acts.length;
  }

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'title': title,
      'coverUrl': coverUrl,
      'createdAt': createdAt.toIso8601String(),
      'updatedAt': updatedAt.toIso8601String(),
      'acts': acts.map((act) => act.toJson()).toList(),
      'lastEditedChapterId': lastEditedChapterId,
      'author': author?.toJson(),
      'metadata': {
        'wordCount': wordCount,
        'readTime': readTime,
        'version': version,
        'contributors': contributors,
      },
    };
  }

  /// 创建Novel的副本
  Novel copyWith({
    String? id,
    String? title,
    String? coverUrl,
    DateTime? createdAt,
    DateTime? updatedAt,
    List<Act>? acts,
    String? lastEditedChapterId,
    Author? author,
    int? wordCount,
    int? readTime,
    int? version,
    List<String>? contributors,
  }) {
    return Novel(
      id: id ?? this.id,
      title: title ?? this.title,
      coverUrl: coverUrl?? this.coverUrl,
      createdAt: createdAt ?? this.createdAt,
      updatedAt: updatedAt ?? this.updatedAt,
      acts: acts ?? this.acts,
      lastEditedChapterId: lastEditedChapterId ?? this.lastEditedChapterId,
      author: author ?? this.author,
      wordCount: wordCount ?? this.wordCount,
      readTime: readTime ?? this.readTime,
      version: version ?? this.version,
      contributors: contributors ?? this.contributors,
    );
  }

  /// 创建一个空的小说结构
  static Novel createEmpty(String id, String title) {
    final now = DateTime.now();
    return Novel(
      id: id,
      title: title,
      createdAt: now,
      updatedAt: now,
      acts: [],
    );
  }

  /// 添加一个新的Act
  Novel addAct(String title) {
    final newAct = Act(
      id: 'act_${DateTime.now().millisecondsSinceEpoch}',
      title: title,
      order: acts.length + 1,
      chapters: [],
    );

    return copyWith(
      acts: [...acts, newAct],
      updatedAt: DateTime.now(),
    );
  }

  /// 获取指定Act
  Act? getAct(String actId) {
    try {
      return acts.firstWhere((act) => act.id == actId);
    } catch (e) {
      return null;
    }
  }

  /// 获取指定Chapter
  Chapter? getChapter(String actId, String chapterId) {
    final act = getAct(actId);
    if (act == null) return null;

    try {
      return act.chapters.firstWhere((chapter) => chapter.id == chapterId);
    } catch (e) {
      return null;
    }
  }

  /// 根据章节ID直接获取章节，不需要知道Act ID
  Chapter? getChapterById(String chapterId) {
    for (final act in acts) {
      try {
        final chapter =
            act.chapters.firstWhere((chapter) => chapter.id == chapterId);
        return chapter;
      } catch (e) {
        // 继续查找下一个act
      }
    }
    return null;
  }

  /// 获取指定Scene
  Scene? getScene(String actId, String chapterId, {String? sceneId}) {
    final chapter = getChapter(actId, chapterId);
    if (chapter == null) return null;

    if (sceneId != null) {
      // 如果提供了sceneId，则获取特定Scene
      return chapter.getScene(sceneId);
    } else if (chapter.scenes.isNotEmpty) {
      // 否则返回第一个Scene
      return chapter.scenes.first;
    }

    return null;
  }

  /// 获取上下文章节（前后n章）
  List<Chapter> getContextChapters(String chapterId, int n) {
    // 提取所有章节
    List<Chapter> allChapters = [];
    for (final act in acts) {
      allChapters.addAll(act.chapters);
    }

    // 按order排序
    allChapters.sort((a, b) => a.order.compareTo(b.order));

    // 找到当前章节的索引
    int currentIndex =
        allChapters.indexWhere((chapter) => chapter.id == chapterId);
    if (currentIndex == -1) {
      // 如果找不到当前章节，返回前n章
      return allChapters.take(n).toList();
    }

    // 计算前后n章的范围
    int startIndex = (currentIndex - n) < 0 ? 0 : (currentIndex - n);
    int endIndex = (currentIndex + n) >= allChapters.length
        ? allChapters.length - 1
        : (currentIndex + n);

    // 提取前后n章
    return allChapters.sublist(startIndex, endIndex + 1);
  }

  /// 更新最后编辑的章节ID
  Novel updateLastEditedChapter(String chapterId) {
    return copyWith(
      lastEditedChapterId: chapterId,
      updatedAt: DateTime.now(),
    );
  }
}

/// 幕模型（如Act 1, Act 2等）
class Act {
  Act({
    required this.id,
    required this.title,
    required this.order,
    this.chapters = const [],
  });

  /// 从JSON创建Act实例
  factory Act.fromJson(Map<String, dynamic> json) {
    List<Chapter> parsedChapters = [];
    if (json['chapters'] != null && json['chapters'] is List) {
      parsedChapters = (json['chapters'] as List<dynamic>)
          .map((chapterJson) =>
              Chapter.fromJson(chapterJson as Map<String, dynamic>))
          .toList();
    }
    return Act(
      id: json['id'] as String,
      title: json['title'] as String,
      order: json['order'] as int,
      chapters: parsedChapters, // 使用解析后的列表
    );
  }
  final String id;
  final String title;
  final int order;
  final List<Chapter> chapters;

  /// 计算Act的总字数
  int get wordCount {
    return chapters.fold(0, (sum, chapter) => sum + chapter.wordCount);
  }

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'title': title,
      'order': order,
      'chapters': chapters.map((chapter) => chapter.toJson()).toList(),
    };
  }

  /// 创建Act的副本
  Act copyWith({
    String? id,
    String? title,
    int? order,
    List<Chapter>? chapters,
  }) {
    return Act(
      id: id ?? this.id,
      title: title ?? this.title,
      order: order ?? this.order,
      chapters: chapters ?? this.chapters,
    );
  }

  /// 添加一个新的Chapter
  Act addChapter(String title) {
    // 创建一个默认的Scene
    final defaultScene = Scene.createEmpty();

    final newChapter = Chapter(
      id: 'chapter_${DateTime.now().millisecondsSinceEpoch}',
      title: title,
      order: chapters.length + 1,
      scenes: [defaultScene], // 包含一个默认的Scene
    );

    return copyWith(
      chapters: [...chapters, newChapter],
    );
  }

  /// 获取指定Chapter
  Chapter? getChapter(String chapterId) {
    try {
      return chapters.firstWhere((chapter) => chapter.id == chapterId);
    } catch (e) {
      return null;
    }
  }
}

/// 章节模型
class Chapter {
  Chapter({
    required this.id,
    required this.title,
    required this.order,
    this.scenes = const [],
    this.sceneIds = const [], // 添加 sceneIds 字段
  });

  /// 从JSON创建Chapter实例
  factory Chapter.fromJson(Map<String, dynamic> json) {
    List<Scene> parsedScenes = [];
    List<String> parsedSceneIds = [];
    
    // 解析场景列表
    if (json['scenes'] != null && json['scenes'] is List) {
      parsedScenes = (json['scenes'] as List<dynamic>)
          .map((sceneJson) => Scene.fromJson(sceneJson as Map<String, dynamic>))
          .toList();
    }
    
    // 解析场景ID列表
    if (json['sceneIds'] != null && json['sceneIds'] is List) {
      parsedSceneIds = (json['sceneIds'] as List<dynamic>)
          .map((id) => id.toString())
          .toList();
    }
    
    return Chapter(
      id: json['id'] as String,
      title: json['title'] as String,
      order: json['order'] as int,
      scenes: parsedScenes,
      sceneIds: parsedSceneIds, // 保存场景ID列表
    );
  }
  final String id;
  final String title;
  final int order;
  final List<Scene> scenes;
  final List<String> sceneIds; // 保存从后端返回的场景ID列表

  /// 计算章节的总字数
  int get wordCount {
    return scenes.fold(0, (sum, scene) => sum + scene.wordCount);
  }
  
  /// 获取场景总数（scenes列表或sceneIds列表中的较大值）
  int get sceneCount {
    int scenesLength = scenes.length;
    int sceneIdsLength = sceneIds.length;
    int result = scenesLength > sceneIdsLength ? scenesLength : sceneIdsLength;
    //AppLogger.d('Chapter', '章节 $id 场景计数: scenes=$scenesLength, sceneIds=$sceneIdsLength, 取较大值=$result');
    return result;
  }

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'title': title,
      'order': order,
      'scenes': scenes.map((scene) => scene.toJson()).toList(),
      'sceneIds': sceneIds, // 添加场景ID列表
    };
  }

  /// 创建Chapter的副本
  Chapter copyWith({
    String? id,
    String? title,
    int? order,
    List<Scene>? scenes,
    List<String>? sceneIds, // 添加sceneIds参数
  }) {
    return Chapter(
      id: id ?? this.id,
      title: title ?? this.title,
      order: order ?? this.order,
      scenes: scenes ?? this.scenes,
      sceneIds: sceneIds ?? this.sceneIds, // 设置sceneIds
    );
  }

  /// 添加一个新的Scene
  void addScene(Scene newScene) {
    scenes.add(newScene);
  }

  /// 获取指定Scene
  Scene? getScene(String sceneId) {
    try {
      return scenes.firstWhere((scene) => scene.id == sceneId);
    } catch (e) {
      return null;
    }
  }

  /// 更新指定Scene
  Chapter updateScene(String sceneId, Scene updatedScene) {
    final updatedScenes = scenes.map((scene) {
      if (scene.id == sceneId) {
        return updatedScene;
      }
      return scene;
    }).toList();

    return copyWith(scenes: updatedScenes);
  }
}

/// 场景模型
class Scene {
  Scene({
    required this.id,
    required this.content,
    required this.wordCount,
    required this.summary,
    required this.lastEdited,
    this.title = '',
    this.actId = '',
    this.chapterId = '',
    this.version = 1,
    this.history = const [],
  });

  /// 从JSON创建Scene实例
  factory Scene.fromJson(Map<String, dynamic> json) {
    // 创建安全的Summary对象
    Summary summaryObj;
    try {
      // 处理summary字段 - 可能是字符串（后端）或对象（前端）
      if (json.containsKey('summary')) {
        final summaryData = json['summary'];
        if (summaryData is Map<String, dynamic>) {
          // 如果是对象格式，直接解析
          summaryObj = Summary.fromJson(summaryData);
        } else if (summaryData is String) {
          // 如果是字符串格式（后端发送的），创建Summary对象
          final sceneId = json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString();
          summaryObj = Summary(
            id: '${sceneId}_summary',
            content: summaryData,
          );
        } else {
          // 其他格式，创建默认Summary
          final sceneId = json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString();
          summaryObj = Summary(
            id: '${sceneId}_summary',
            content: '',
          );
          AppLogger.w('Scene.fromJson', '场景 $sceneId 的摘要字段类型不支持: ${summaryData.runtimeType}');
        }
      } else {
        // 创建默认Summary
        final sceneId = json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString();
        summaryObj = Summary(
          id: '${sceneId}_summary',
          content: '',
        );
        AppLogger.w('Scene.fromJson', '场景 $sceneId 缺少摘要字段，已创建默认摘要');
      }
    } catch (e) {
      // 处理任何异常，创建默认Summary
      final sceneId = json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString();
      summaryObj = Summary(
        id: '${sceneId}_summary',
        content: '',
      );
      AppLogger.e('Scene.fromJson', '解析场景 $sceneId 的摘要时出错', e);
    }
    
    // 安全解析lastEdited字段，支持多种日期格式
    DateTime lastEditedDate;
    try {
      if (json.containsKey('lastEdited') && json['lastEdited'] != null) {
        final lastEditedStr = json['lastEdited'].toString();
        lastEditedDate = _parseDateTime(lastEditedStr);
      } else if (json.containsKey('updatedAt') && json['updatedAt'] != null) {
        // 兼容后端可能使用updatedAt字段
        final updatedAtStr = json['updatedAt'].toString();
        lastEditedDate = _parseDateTime(updatedAtStr);
      } else {
        lastEditedDate = DateTime.now();
        AppLogger.w('Scene.fromJson', '场景 ${json['id']} 缺少时间字段，使用当前时间');
      }
    } catch (e) {
      lastEditedDate = DateTime.now();
      AppLogger.w('Scene.fromJson', '解析场景 ${json['id']} 的时间字段失败，使用当前时间', e);
    }
    
    return Scene(
      id: json['id'] ?? DateTime.now().millisecondsSinceEpoch.toString(),
      content: json['content'] ?? '',
      wordCount: json['wordCount'] ?? 0,
      summary: summaryObj,
      lastEdited: lastEditedDate,
      title: json['title'] ?? '',
      actId: json['actId'] ?? '',
      chapterId: json['chapterId'] ?? '',
      version: json['version'] ?? 1,
      history: [],
    );
  }
  
  final String id;
  final String content;
  final int wordCount;
  final Summary summary;
  final DateTime lastEdited;
  final String title;
  final String actId;
  final String chapterId;
  final int version;
  final List<HistoryEntry> history;

  /// 解析多种日期格式的工具方法
  static DateTime _parseDateTime(String dateTimeStr) {
    if (dateTimeStr.isEmpty) {
      return DateTime.now();
    }
    
    try {
      // 尝试标准ISO格式
      return DateTime.parse(dateTimeStr);
    } catch (e1) {
      try {
        // 尝试处理带毫秒的格式 "yyyy-MM-dd'T'HH:mm:ss.SSS"
        if (dateTimeStr.contains('T') && dateTimeStr.contains('.')) {
          // 如果包含时区信息，先移除
          String cleanStr = dateTimeStr;
          if (cleanStr.endsWith('Z')) {
            cleanStr = cleanStr.substring(0, cleanStr.length - 1);
          }
          if (cleanStr.contains('+') || cleanStr.lastIndexOf('-') > 10) {
            // 移除时区偏移
            final timeZoneIndex = cleanStr.lastIndexOf('+') > cleanStr.lastIndexOf('-') 
                ? cleanStr.lastIndexOf('+') 
                : cleanStr.lastIndexOf('-');
            if (timeZoneIndex > 10) {
              cleanStr = cleanStr.substring(0, timeZoneIndex);
            }
          }
          return DateTime.parse(cleanStr);
        }
        
        // 尝试其他常见格式
        // 格式：yyyy-MM-dd HH:mm:ss
        if (dateTimeStr.contains(' ') && !dateTimeStr.contains('T')) {
          final parts = dateTimeStr.split(' ');
          if (parts.length == 2) {
            final datePart = parts[0];
            final timePart = parts[1];
            final isoStr = '${datePart}T$timePart';
            return DateTime.parse(isoStr);
          }
        }
        
        throw e1; // 如果都失败了，抛出原始异常
      } catch (e2) {
        AppLogger.w('Scene._parseDateTime', '无法解析日期格式: $dateTimeStr，使用当前时间');
        return DateTime.now();
      }
    }
  }

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'content': content,
      'wordCount': wordCount,
      'summary': summary.toJson(),
      'lastEdited': lastEdited.toIso8601String(),
      'title': title,
      'actId': actId,
      'chapterId': chapterId,
      'version': version,
      'history': history.map((entry) => entry.toJson()).toList(),
    };
  }

  /// 创建Scene的副本
  Scene copyWith({
    String? id,
    String? content,
    int? wordCount,
    Summary? summary,
    DateTime? lastEdited,
    String? title,
    String? actId,
    String? chapterId,
    int? version,
    List<HistoryEntry>? history,
  }) {
    return Scene(
      id: id ?? this.id,
      content: content ?? this.content,
      wordCount: wordCount ?? this.wordCount,
      summary: summary ?? this.summary,
      lastEdited: lastEdited ?? this.lastEdited,
      title: title ?? this.title,
      actId: actId ?? this.actId,
      chapterId: chapterId ?? this.chapterId,
      version: version ?? this.version,
      history: history ?? this.history,
    );
  }

  /// 创建一个空的场景
  static Scene createEmpty() {
    const defaultContent = '{"ops":[{"insert":"\\n"}]}'; // <-- 确保是这个值
    final now = DateTime.now();
    return Scene(
      id: DateTime.now().millisecondsSinceEpoch.toString(),
      content: defaultContent,
      wordCount: 0,
      summary: Summary(
        id: '${DateTime.now().millisecondsSinceEpoch}_summary',
        content: '',
      ),
      lastEdited: now,
      title: '',
      actId: '',
      chapterId: '',
      version: 1,
      history: [],
    );
  }

  /// 创建一个默认的场景
  static Scene createDefault(String sceneIdBase) {
    // 使用正确Quill Delta格式包含ops对象的内容
    const defaultContent = '{"ops":[{"insert":"\\n"}]}';
    final now = DateTime.now();
    return Scene(
      id: sceneIdBase,
      content: defaultContent,
      wordCount: 0,
      summary: Summary(
        id: '${sceneIdBase}_summary',
        content: '',
      ),
      lastEdited: now,
      title: '新场景',
      actId: '',
      chapterId: '',
      version: 1,
      history: [],
    );
  }
}

/// 摘要模型
class Summary {
  Summary({
    required this.id,
    required this.content,
  });

  /// 从JSON创建Summary实例
  factory Summary.fromJson(Map<String, dynamic> json) {
    return Summary(
      id: json['id'] as String,
      content: json['content'] as String,
    );
  }
  final String id;
  final String content;

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'content': content,
    };
  }

  /// 创建Summary的副本
  Summary copyWith({
    String? id,
    String? content,
  }) {
    return Summary(
      id: id ?? this.id,
      content: content ?? this.content,
    );
  }

  /// 创建一个空的摘要
  static Summary createEmpty() {
    return Summary(
      id: 'summary_${DateTime.now().millisecondsSinceEpoch}',
      content: '',
    );
  }
}

class HistoryEntry {
  HistoryEntry({
    this.content,
    required this.updatedAt,
    required this.updatedBy,
    required this.reason,
  });

  factory HistoryEntry.fromJson(Map<String, dynamic> json) {
    DateTime updatedAt;
    try {
      updatedAt = DateTime.parse(json['updatedAt']);
    } catch (e) {
      updatedAt = DateTime.now();
    }

    return HistoryEntry(
      content: json['content'],
      updatedAt: updatedAt,
      updatedBy: json['updatedBy'] ?? 'unknown',
      reason: json['reason'] ?? '',
    );
  }
  final String? content;
  final DateTime updatedAt;
  final String updatedBy;
  final String reason;

  Map<String, dynamic> toJson() => {
        'content': content,
        'updatedAt': updatedAt.toIso8601String(),
        'updatedBy': updatedBy,
        'reason': reason,
      };
}

/// 作者信息模型
class Author {
  Author({
    required this.id,
    required this.username,
  });

  /// 从JSON创建Author实例
  factory Author.fromJson(Map<String, dynamic> json) {
    return Author(
      id: json['id'] ?? '',
      username: json['username'] ?? '未知作者',
    );
  }

  final String id;
  final String username;

  /// 转换为JSON
  Map<String, dynamic> toJson() {
    return {
      'id': id,
      'username': username,
    };
  }

  /// 创建Author的副本
  Author copyWith({
    String? id,
    String? username,
  }) {
    return Author(
      id: id ?? this.id,
      username: username ?? this.username,
    );
  }
}