class HeartbeatResponse {
  int statusCode; // 状态码，1字节无符号
  int nextPingTime; // 下次ping时间秒数，2字节无符号

  HeartbeatResponse({required this.statusCode, required this.nextPingTime});

  @override
  String toString() {
    return 'HeartbeatResponse{statusCode: $statusCode, nextPingTime: $nextPingTime}';
  }

  // 反序列化方法
  static HeartbeatResponse deserialize(List<int> bytes) {
    if (bytes.length < 3) {
      throw FormatException("Invalid HeartbeatResponse length");
    }

    final response = HeartbeatResponse(
      statusCode: bytes[0], // 状态码，1字节
      nextPingTime: (bytes[2] << 8) | bytes[1], // 下次ping时间，2字节小端序
    );

    return response;
  }

  // 序列化方法
  static List<int> serialize(HeartbeatResponse response) {
    final List<int> bytes = [];

    // 序列化状态码
    bytes.add(response.statusCode);

    // 序列化下次ping时间（2字节小端序）
    bytes.add(response.nextPingTime & 0xFF);
    bytes.add((response.nextPingTime >> 8) & 0xFF);

    return bytes;
  }
}