enum GroupType { group, direct }

class GroupModel {
  final String id;
  final String name;
  final String? description;
  final bool isActive;
  final GroupType type;
  final DateTime? createdAt;
  final int memberCount;

  const GroupModel({
    required this.id,
    required this.name,
    this.description,
    required this.isActive,
    this.type = GroupType.group,
    this.createdAt,
    this.memberCount = 0,
  });

  factory GroupModel.fromJson(Map<String, dynamic> json) {
    return GroupModel(
      id: json['id'] as String,
      name: json['name'] as String,
      description: json['description'] as String?,
      isActive: (json['is_active'] as bool?) ?? true,
      type: GroupType.values.firstWhere(
        (t) => t.name == (json['type'] as String? ?? 'group'),
        orElse: () => GroupType.group,
      ),
      createdAt: json['created_at'] != null
          ? DateTime.tryParse(json['created_at'] as String)
          : null,
      memberCount: (json['member_count'] as int?) ?? 0,
    );
  }

  Map<String, dynamic> toJson() => {
        'id': id,
        'name': name,
        if (description != null) 'description': description,
        'is_active': isActive,
        'type': type.name,
        if (createdAt != null) 'created_at': createdAt!.toIso8601String(),
        'member_count': memberCount,
      };

  GroupModel copyWith({
    String? id,
    String? name,
    String? description,
    bool? isActive,
    GroupType? type,
    DateTime? createdAt,
    int? memberCount,
  }) {
    return GroupModel(
      id: id ?? this.id,
      name: name ?? this.name,
      description: description ?? this.description,
      isActive: isActive ?? this.isActive,
      type: type ?? this.type,
      createdAt: createdAt ?? this.createdAt,
      memberCount: memberCount ?? this.memberCount,
    );
  }
}