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

#include <winsock2.h>
#include <windows.h>


#include <string.h>

//#include <conio.h>


#include <iostream>
using namespace std;

const int PORT_NUM = 5513; //I just arbitrarily chose this

const int BUFFER_SIZE = 128;



bool initWinsock()
{
	WSADATA w;    // used to store information about WinSock version

	int error = WSAStartup (0x0202, &w);   // Fill in w


	if (error)
	{ // there was an error

	  return false;
	}
	if (w.wVersion != 0x0202)
	{ // wrong WinSock version!

	  WSACleanup (); // unload ws2_32.dll

	  return false;
	}

	return true;
}

int server()
{
		cout << "SERVER\n";

		const int MAX_CLIENTS = 1;

		// Create socket:

		//	SOCK_STREAM = TCP

		//	SOCK_DGRAM	= UDP

		SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
		if (s == INVALID_SOCKET)
		{
			cout << "Could not create socket.\n";
			return 1;
		}



		//Bind socket (only for servers)

		sockaddr_in addr;				// the address structure for a TCP socket

		addr.sin_family = AF_INET;      // Address family Internet

		addr.sin_port = htons (PORT_NUM);   // Assign port 80 to this socket

		addr.sin_addr.s_addr = htonl (INADDR_ANY);   // No destination

		if (bind(s, (LPSOCKADDR)&addr, sizeof(addr)) == SOCKET_ERROR)
		{ // error

			cout << "Could not bind socket.\n";
			return 1;         // quit

		}


		//Server: Listen to port

		if (listen(s,MAX_CLIENTS)==SOCKET_ERROR)
		{
			// error!  unable to listen

			cout << "Could not listen to port.\n";
			return 1;
		}

		//Wait for client and accept him:

		SOCKET client;			// socket handles to clients

		sockaddr client_sock;	// info on client sockets

		int addr_size = sizeof(client_sock);

		client = 
			accept (s, &client_sock, &addr_size);
			
		if (client == INVALID_SOCKET)
		{
			// error accepting connection

			cout << "Could not accept connection\n";
			return 1;
		}
		else
		{
			// start a thread that will communicate with client

		}


		//Accept and send data


		char buffer[BUFFER_SIZE];
		cout << "Enter any string: ";
		cin >> buffer;
		//Send data:

		if(send (s, buffer, strlen(buffer), 0) == SOCKET_ERROR)
		{
			cout	<< "Error sending.\nError code: "
					<< WSAGetLastError();
			return 1;
		}


		shutdown (s, SD_SEND);  // s cannot send anymore

		// you should check to see if any last data has arrived here

		closesocket (s);   // close


		return 0;
}

int client()
{
			cout << "CLIENT\n";

		//Create client socket

		SOCKET s = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP );
		if(s == INVALID_SOCKET)
		{
			cout << "Could not create socket.\n";
			return 1;
		}

		
		//Try to connect with socket s

		sockaddr_in target;

		target.sin_family = AF_INET;           // address family Internet

		target.sin_port = htons (PORT_NUM);        // set server’s port number

		target.sin_addr.s_addr = inet_addr ("127.0.0.1");  // set server’s IP (originally 52.123.72.251)


		if (connect(s, (LPSOCKADDR)⌖, sizeof(target)) == SOCKET_ERROR)
		{
			// an error connecting has occurred!

			cout << "Could not connect\n.";
			return 1;
		}


		//Receive data

		char buffer2[BUFFER_SIZE];
		Sleep(100);
		if(recv (s, buffer2, sizeof(buffer2), 0) == SOCKET_ERROR)
		{
			cout	<< "Error receiving.\nError code: "
					<< WSAGetLastError();
			return 1;
		}

		cout << buffer2 << endl;

		shutdown (s, SD_RECEIVE);  // s cannot receive anymore

		// you should check to see if any last data has arrived here

		closesocket (s);   // close


		return 0;
}

int main()
{
	if(!initWinsock())
	{
		cout << "Could not initialize winsock\n";
		return 1;
	}

	int choice;
	cout <<  "Client (1) or server (0)? ";
	cin >> choice;

	if(choice == 0)
		server();
	else if(choice == 1)
		client();


	WSACleanup();

	return 0;
}