import 'dart:convert';

class LoginResponse {
  int? responseType;
  int? rejectType;
  int? nextPingTime;
  String? clientAddr;

  LoginResponse({
    this.responseType,
    this.rejectType,
    this.nextPingTime,
    this.clientAddr,
  });

  factory LoginResponse.fromBytes(List<int> bytes) {
    final message = LoginResponse();
    int offset = 0;

    // responseType (1 byte)
    if (bytes.length - offset >= 1) {
      message.responseType = bytes[offset];
      offset += 1;
    } else {
      throw FormatException("Invalid responseType length");
    }

    // rejectType (1 byte)
    if (bytes.length - offset >= 1) {
      message.rejectType = bytes[offset];
      offset += 1;
    } else {
      throw FormatException("Invalid rejectType length");
    }

    // nextPingTime (2 bytes, little-endian)
    if (bytes.length - offset >= 2) {
      message.nextPingTime = (bytes[offset + 1] << 8) | bytes[offset];
      offset += 2;
    } else {
      throw FormatException("Invalid nextPingTime length");
    }

    // ClientAddr (remaining bytes)
    if (bytes.length > offset) {
      message.clientAddr =
          utf8.decode(bytes.sublist(offset).takeWhile((byte) => byte != 0).toList());
    } else {
      throw FormatException("Invalid ClientAddr length");
    }

    return message;
  }

  @override
  String toString() {
    return 'LoginResponse{responseType: $responseType, rejectType: $rejectType, nextPingTime: $nextPingTime, clientAddr: $clientAddr}';
  }
}