enum FriendRequestStatus { pending, accepted, rejected }

class FriendUser {
  final String id;
  final String username;
  final String? avatarUrl;

  const FriendUser({
    required this.id,
    required this.username,
    required this.avatarUrl,
  });

  factory FriendUser.fromJson(Map<String, dynamic> json) {
    return FriendUser(
      id: json['id'] as String,
      username: json['username'] as String,
      avatarUrl: json['avatar_url'] as String?,
    );
  }
}

class FriendRequest {
  final String id;
  final FriendUser sender;
  final FriendUser recipient;
  final String? content;
  final FriendRequestStatus status;
  final DateTime createdAt;

  const FriendRequest({
    required this.id,
    required this.sender,
    required this.recipient,
    required this.content,
    required this.status,
    required this.createdAt,
  });

  factory FriendRequest.fromJson(Map<String, dynamic> json) {
    final rawContent = json['content'] as Map<String, dynamic>?;
    final content = rawContent?['message'] as String?;
    return FriendRequest(
      id: json['id'] as String,
      sender: FriendUser.fromJson(json['sender'] as Map<String, dynamic>),
      recipient: FriendUser.fromJson(json['recipient'] as Map<String, dynamic>),
      content: content,
      status: _friendRequestStatusFromApi(json['status'] as String),
      createdAt: DateTime.parse(json['created_at'] as String),
    );
  }
}

FriendRequestStatus _friendRequestStatusFromApi(String raw) {
  switch (raw) {
    case 'pending':
      return FriendRequestStatus.pending;
    case 'accepted':
      return FriendRequestStatus.accepted;
    case 'rejected':
      return FriendRequestStatus.rejected;
    default:
      throw StateError('Unsupported friend request status: $raw');
  }
}