class User {
  final String id;
  final String username;
  final String? avatar;
  final String? bio;
  final String? publicKey;
  final DateTime createdAt;

  User({
    required this.id,
    required this.username,
    this.avatar,
    this.bio,
    this.publicKey,
    DateTime? createdAt,
  }) : createdAt = createdAt ?? DateTime.now();

  factory User.fromJson(Map<String, dynamic> json) {
    return User(
      id: json['id'] as String,
      username: json['username'] as String,
      avatar: json['avatar'] as String?,
      bio: json['bio'] as String?,
      publicKey: json['public_key'] as String?,
      createdAt: json['created_at'] != null
          ? DateTime.parse(json['created_at'] as String)
          : DateTime.now(),
    );
  }

  Map<String, dynamic> toJson() => {
        'id': id,
        'username': username,
        'avatar': avatar,
        'bio': bio,
        'public_key': publicKey,
        'created_at': createdAt.toIso8601String(),
      };
}