#include <stdio.h>
#include <winsock.h>
#include <iostream>

#pragma comment(lib, "ws2_32.lib")
#pragma comment(lib, "winmm.lib")

struct sockaddr_in udp_addr, udp_receive;
int addr_len = sizeof(struct sockaddr_in);

using namespace std;

main()
{
	SOCKET udp_socket;
	int	   Er_code;
	DWORD  Time = 0;

	WORD    wVersion = MAKEWORD(2, 0);
	WSADATA wsaData;

	Er_code = WSAStartup(wVersion, &wsaData);
	if(Er_code != 0){
		cout << "Error! Failed initializing WinSock." << endl;
		return 0;
	}

	// udp initializing
	udp_addr.sin_family = AF_INET;
	udp_addr.sin_port   = htons(13546); // Port
	udp_addr.sin_addr.s_addr = inet_addr("92.63.102.249");

	udp_socket = socket(PF_INET, SOCK_DGRAM, 0);
	if(udp_socket == INVALID_SOCKET){
		cout << "Error! Failed create udp socket." << endl;
		return 0;
	}

	for(int i = 0; i < 10000; i++)
	{
		char text[32] = "";
		char buf[128] = "";

		sprintf(text, "Hello, test message %d", i);

		Time = timeGetTime();

		*(int*)text = i;

		Er_code = sendto(udp_socket, text, sizeof(text), 0, (struct sockaddr *)&udp_addr, sizeof(struct sockaddr_in));
		if(Er_code == SOCKET_ERROR){
			cout << "Send error! I is : " << i << endl;
			break;
		}

		Er_code = recvfrom(udp_socket, buf, 128, 0, (struct sockaddr *)&udp_receive, &addr_len);
		if(Er_code == SOCKET_ERROR){
			cout << "Receive error! I is : " << i << endl;
			break;
		}

		if(*(int*)buf != i){
			cout << "Packet loss. n:" << i << endl;
			break;
		}

		Time = timeGetTime() - Time;

		if(i % 100 == 0){
		cout << "Response from " << inet_ntoa(udp_receive.sin_addr) << ":" << ntohs(udp_receive.sin_port) /*<< " is: \n"
			<< buf */<< "Ping: " << Time << "ms" << endl;
		}


	}

	cout << "Completed." << endl;
	cin >> i;

	closesocket(udp_socket);

	return 0;
}