class ContactGroup {
  final String name;
  final List<String> memberKeys;

  const ContactGroup({
    required this.name,
    required this.memberKeys,
  });

  ContactGroup copyWith({
    String? name,
    List<String>? memberKeys,
  }) {
    return ContactGroup(
      name: name ?? this.name,
      memberKeys: memberKeys ?? List<String>.from(this.memberKeys),
    );
  }

  Map<String, dynamic> toJson() {
    return {
      'name': name,
      'members': memberKeys,
    };
  }

  factory ContactGroup.fromJson(Map<String, dynamic> json) {
    final members = (json['members'] as List?)
            ?.map((value) => value.toString())
            .toList() ??
        <String>[];
    return ContactGroup(
      name: json['name'] as String? ?? '',
      memberKeys: members,
    );
  }
}