/****************************************************************************
 * Copyright (C) 2010-2012
 * by Dimok
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any
 * damages arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any
 * purpose, including commercial applications, and to alter it and
 * redistribute it freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you
 * must not claim that you wrote the original software. If you use
 * this software in a product, an acknowledgment in the product
 * documentation would be appreciated but is not required.
 *
 * 2. Altered source versions must be plainly marked as such, and
 * must not be misrepresented as being the original software.
 *
 * 3. This notice may not be removed or altered from any source
 * distribution.
 ***************************************************************************/
#include <stdio.h>
#include <sys/types.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "network.h" // Include Winsock Library

static int sock_id = -1;
static struct sockaddr_in servaddr;

int Bind()
{
    memset(&servaddr,0,sizeof(servaddr));

	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
    servaddr.sin_port = htons(LISTEN_PORT);
    servaddr.sin_family = AF_INET;

    if (bind(sock_id, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0)
    {
        close(sock_id);
        return -1;
    }

    return 0;
}

void CloseSocket()
{
    if(sock_id < 0)
        return;

    close(sock_id);
    sock_id = -1;
}

int NetInit()
{
    if(sock_id >= 0)
        return sock_id;

#ifdef WIN32
	WSADATA wsaData;

	// Initialize Winsock
	if (WSAStartup(MAKEWORD(2,2), &wsaData) == SOCKET_ERROR)
		return -1;
#endif
    //Get a socket
    if((sock_id = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP)) == -1)
        return -1;

#ifdef WIN32
    u_long mode = 1;
    ioctlsocket(sock_id, FIONBIO, &mode);
#else
    int flags = fcntl(sock_id, F_GETFL, 0);
    fcntl(sock_id, F_SETFL, flags | O_NONBLOCK);
#endif

    return sock_id;
}

int NetRead(void *buffer, unsigned int buf_len)
{
	if(sock_id < 0)
		return sock_id;

    fd_set fdsRead;
    FD_ZERO(&fdsRead);
    FD_SET(sock_id, &fdsRead);

    struct timeval tv;
    tv.tv_sec = 0;
    tv.tv_usec = 10000;

    if(select(sock_id + 1, &fdsRead, NULL, NULL, &tv) != 1) {
        return 0;
    }

	int len = sizeof(servaddr);

	return recvfrom(sock_id,buffer, buf_len, 0,(struct sockaddr *)&servaddr, &len);
}