// cn-lab2-server.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <winsock2.h>
#include <iostream>
#include <windows.h>
#include <sstream>
#include <thread>

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

using namespace std; 

int client_processing(SOCKET my_sock, const sockaddr_in client_addr, const int client_addr_size, char recv_buff[]) {
	int a, b, c;
	stringstream ss;
	ss << recv_buff;
	ss >> a >> b >> c;
	string triangle_exist = "false";
	if ((a < b + c) && (b < a + c) && (c < a + b))
		triangle_exist = "true";
	sendto(my_sock, triangle_exist.c_str(), triangle_exist.length(), 0, (sockaddr *)&client_addr, client_addr_size);
	cout << "Answer sent" << endl;
	return 0;
}

int port_listen(SOCKET my_sock) {
	while (true) {
		sockaddr_in client_addr;
		int client_addr_size = sizeof(client_addr);
		char recv_buff[1024];
		int len = recvfrom(my_sock, &recv_buff[0], sizeof(recv_buff) - 1, 0, (sockaddr *)&client_addr, &client_addr_size);
		if (len < 0)
			return 0;
		cout << "Request received" << endl;
		recv_buff[len] = '\0';
		thread client(client_processing, my_sock, client_addr, client_addr_size, recv_buff);
	}
	return 0;
}

int main()
{
	cout << "cn-lab2 var10 server start" << endl;
	WSAData wsadata;
	WSAStartup(0x0202, &wsadata);
	cout << "Winsock2 initialized" << endl;
	SOCKET my_sock;
	my_sock = socket(AF_INET, SOCK_DGRAM, 0);
	if (my_sock == INVALID_SOCKET) {
		cout << "Create socket error " << WSAGetLastError() << endl;
		WSACleanup();
		return 1;
	}
	cout << "Socket created successfully" << endl;
	sockaddr_in local_addr;
	local_addr.sin_family = AF_INET;
	local_addr.sin_addr.S_un.S_addr = 0;
	local_addr.sin_port = htons(5002);
	if (::bind(my_sock, (sockaddr *)&local_addr, sizeof(local_addr))) {
		cout << "Error bind " << WSAGetLastError() << endl;
		closesocket(my_sock);
		WSACleanup();
		return 2;
	}
	cout << "Binding successful" << endl;
	thread listen(port_listen, ref(my_sock));
	string s;
	do {
		cin >> s;
	} while (s != "stop");
	shutdown(my_sock, SD_BOTH);
	closesocket(my_sock);
	if (listen.joinable())
		listen.join();
	listen.~thread();
	WSACleanup();
	return 0;
}