problem_check_system/lib/data/models/problem_model.dart

// problem_model.dart
import 'dart:convert';
import 'package:problem_check_system/data/models/enum_model.dart';
import 'package:problem_check_system/data/models/image_metadata_model.dart';

class Problem {
  String? id;
  String description;
  String location;
  List<ImageMetadata> imageUrls;
  DateTime creationTime;
  SyncStatus syncStatus;
  String? censorTaskId;
  String? bindData;
  bool isChecked;

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

  // copyWith method to create a new instance with updated values
  Problem copyWith({
    String? id,
    String? description,
    String? location,
    List<ImageMetadata>? imageUrls,
    DateTime? creationTime,
    SyncStatus? syncStatus,
    String? censorTaskId,
    String? bindData,
  }) {
    return Problem(
      id: id ?? this.id,
      description: description ?? this.description,
      location: location ?? this.location,
      imageUrls: imageUrls ?? this.imageUrls,
      creationTime: creationTime ?? this.creationTime,
      syncStatus: syncStatus ?? this.syncStatus,
      censorTaskId: censorTaskId ?? this.censorTaskId,
      bindData: bindData ?? this.bindData,
    );
  }

  // toMap method for serializing to a database-friendly Map
  Map<String, dynamic> toMap() {
    return {
      'id': id,
      'description': description,
      'location': location,
      'imageUrls': jsonEncode(imageUrls.map((meta) => meta.toMap()).toList()),
      'creationTime': creationTime.millisecondsSinceEpoch,
      'syncStatus': syncStatus.index,
      'censorTaskId': censorTaskId,
      'bindData': bindData,
    };
  }

  // fromMap factory constructor for deserializing from a Map
  factory Problem.fromMap(Map<String, dynamic> map) {
    return Problem(
      id: map['id'],
      description: map['description'],
      location: map['location'],
      imageUrls: (jsonDecode(map['imageUrls']) as List)
          .map((item) => ImageMetadata.fromMap(item as Map<String, dynamic>))
          .toList(),
      creationTime: DateTime.fromMillisecondsSinceEpoch(
        map['creationTime'] as int,
      ),
      syncStatus: SyncStatus.values[map['syncStatus'] as int],
      censorTaskId: map['censorTaskId'],
      bindData: map['bindData'],
    );
  }
}