problem_check_system/lib/data/models/problem_model.dart

import 'dart:convert';

import 'package:problem_check_system/data/models/image_metadata_model.dart';
import 'package:problem_check_system/data/models/problem_sync_status.dart';

/// 问题的数据模型。
/// 用于表示系统中的一个具体问题，包含了问题的描述、位置、图片等信息。
class Problem {
  /// 问题的唯一标识符，可空。
  final String? id;

  /// 问题的详细描述。
  final String description;

  /// 问题发生的位置。
  final String location;

  /// 问题的图片元数据列表。
  final List<ImageMetadata> imageUrls;

  /// 问题创建的时间。
  final DateTime creationTime;

  /// 问题的同步状态，默认为未同步。
  final ProblemSyncStatus syncStatus;

  /// 最后修改时间
  final DateTime lastModifiedTime;

  /// 相关的审查任务ID，可空。
  final String? censorTaskId;

  /// 绑定的附加数据，可空。
  final String? bindData;

  /// 问题是否已被检查，默认为false。
  final bool isChecked;

  Problem({
    this.id,
    required this.description,
    required this.location,
    required this.imageUrls,
    required this.creationTime,
    required this.lastModifiedTime,
    this.syncStatus = ProblemSyncStatus.pendingCreate,
    this.censorTaskId,
    this.bindData,
    this.isChecked = false,
  });

  /// copyWith 方法，用于创建对象的副本并修改指定字段
  Problem copyWith({
    String? id,
    String? description,
    String? location,
    List<ImageMetadata>? imageUrls,
    DateTime? creationTime,
    DateTime? lastModifiedTime,
    ProblemSyncStatus? syncStatus,
    bool? isDeleted,
    String? censorTaskId,
    String? bindData,
    bool? isChecked,
  }) {
    return Problem(
      id: id ?? this.id,
      description: description ?? this.description,
      location: location ?? this.location,
      imageUrls: imageUrls ?? this.imageUrls,
      creationTime: creationTime ?? this.creationTime,
      lastModifiedTime: lastModifiedTime ?? this.lastModifiedTime,
      syncStatus: syncStatus ?? this.syncStatus,
      censorTaskId: censorTaskId ?? this.censorTaskId,
      bindData: bindData ?? this.bindData,
      isChecked: isChecked ?? this.isChecked,
    );
  }

  /// 将对象转换为Map，用于SQLite存储
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'description': description,
      'location': location,
      'imageUrls': json.encode(imageUrls.map((e) => e.toMap()).toList()),
      'creationTime': creationTime.millisecondsSinceEpoch,
      'lastModifiedTime': lastModifiedTime.millisecondsSinceEpoch,
      'syncStatus': syncStatus.index,
      'censorTaskId': censorTaskId,
      'bindData': bindData,
      'isChecked': isChecked ? 1 : 0,
    };
  }

  /// 从Map创建对象，用于从SQLite读取
  factory Problem.fromMap(Map<String, dynamic> map) {
    // 处理imageUrls的转换
    List<ImageMetadata> imageUrlsList = [];
    if (map['imageUrls'] != null) {
      try {
        final List<dynamic> imageList = json.decode(map['imageUrls']);
        imageUrlsList = imageList.map((e) => ImageMetadata.fromMap(e)).toList();
      } catch (e) {
        // 如果解析失败，保持空列表
        imageUrlsList = [];
      }
    }

    return Problem(
      id: map['id'],
      description: map['description'],
      location: map['location'],
      imageUrls: imageUrlsList,
      creationTime: DateTime.fromMillisecondsSinceEpoch(map['creationTime']),
      lastModifiedTime: DateTime.fromMillisecondsSinceEpoch(
        map['lastModifiedTime'],
      ),
      syncStatus: ProblemSyncStatus.values[map['syncStatus']],
      censorTaskId: map['censorTaskId'],
      bindData: map['bindData'],
      isChecked: map['isChecked'] == 1,
    );
  }

  /// 转换为JSON字符串
  String toJson() => json.encode(toMap());

  /// 从JSON字符串创建对象
  factory Problem.fromJson(String source) =>
      Problem.fromMap(json.decode(source));
}