class FriendRelation {
  final String id;
  final String friendId;
  final RequestStatus requestStatus;

  const FriendRelation({
    required this.id,
    required this.friendId,
    required this.requestStatus,
  });

  factory FriendRelation.fromMap(String relationId, Map<String, dynamic> map, String userId) {
    return FriendRelation(
      id: relationId,
      friendId: _getId(map, userId),
      requestStatus: getRequestStatus(map["request_status"]),
    );
  }

  static String _getId(Map<String, dynamic> map, String userId) {
    if (map['user_id'] == userId) {
      return map['friend_id'];
    } else {
      return map['user_id'];
    }
  }

  static RequestStatus getRequestStatus(String status) {
    if (status == "pending") return RequestStatus.pending;
    if (status == "accepted") return RequestStatus.accepted;
    if (status == "rejected") return RequestStatus.rejected;
    throw Exception("Request status invalid");
  }
}

enum RequestStatus {
  pending,
  accepted,
  rejected,
}