/*
Copyright (C) 1996-1997 Id Software, Inc.

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

*/

#include "bothdefs.h"
#include "console.h"
#include "net.h"
#include "quakedef.h"
#include "sys.h"
#include "winquake.h"

netadr_t net_local_adr;

netadr_t net_from;
sizebuf_t net_message;
int net_socket;

#define	MAX_UDP_PACKET	(MAX_MSGLEN*2)	/* one more than msg + header */
static byte net_message_buffer[MAX_UDP_PACKET];

static WSADATA winsockdata;


static void
NetadrToSockadr(netadr_t *a, struct sockaddr_in *s)
{
    memset(s, 0, sizeof(*s));
    s->sin_family = AF_INET;

    *(int *)&s->sin_addr = *(int *)&a->ip;
    s->sin_port = a->port;
}

static void
SockadrToNetadr(struct sockaddr_in *s, netadr_t *a)
{
    *(int *)&a->ip = *(int *)&s->sin_addr;
    a->port = s->sin_port;
}

qboolean
NET_CompareBaseAdr(netadr_t a, netadr_t b)
{
  return a.ip.l == b.ip.l;
}

qboolean
NET_CompareAdr(netadr_t a, netadr_t b)
{
  return a.ip.l == b.ip.l && a.port == b.port;
}

const char *
NET_AdrToString(netadr_t a)
{
    static char s[64];

    qsnprintf(s, sizeof(s), "%i.%i.%i.%i:%i", a.ip.b[0], a.ip.b[1], a.ip.b[2], a.ip.b[3],
	    ntohs(a.port));

    return s;
}

const char *
NET_BaseAdrToString(netadr_t a)
{
    static char s[64];

    qsnprintf(s, sizeof(s), "%i.%i.%i.%i", a.ip.b[0], a.ip.b[1], a.ip.b[2], a.ip.b[3]);

    return s;
}

/*
 * =============
 * NET_StringToAdr
 *
 * idnewt
 * idnewt:28000
 * 192.246.40.70
 * 192.246.40.70:28000
 * =============
 */
qboolean
NET_StringToAdr(const char *s, netadr_t *a)
{
    struct hostent *h;
    struct sockaddr_in sadr;
    char *colon;
    char copy[128];

    memset(&sadr, 0, sizeof(sadr));
    sadr.sin_family = AF_INET;

    sadr.sin_port = 0;

    strcpy(copy, s);
    /* strip off a trailing :port if present */
    for (colon = copy; *colon; colon++)
	if (*colon == ':') {
	    *colon = 0;
	    sadr.sin_port = htons((short)atoi(colon + 1));
	}

    if (copy[0] >= '0' && copy[0] <= '9') {
	*(int *)&sadr.sin_addr = inet_addr(copy);
    } else {
	if ((h = gethostbyname(copy)) == 0)
	    return 0;
	*(int *)&sadr.sin_addr = *(int *)h->h_addr_list[0];
    }

    SockadrToNetadr(&sadr, a);

    return true;
}


qboolean
NET_GetPacket(void)
{
    int ret;
    struct sockaddr_in from;
    int fromlen;

    fromlen = sizeof(from);
    ret =
	recvfrom(net_socket, (char *)net_message_buffer,
		 sizeof(net_message_buffer), 0, (struct sockaddr *)&from,
		 &fromlen);
    SockadrToNetadr(&from, &net_from);

    if (ret == -1) {
	int err = WSAGetLastError();

	if (err == WSAEWOULDBLOCK)
	    return false;
	if (err == WSAECONNRESET) {
	    /* This has happened to me a few times, but I don't know how to
	       reproduce it yet... */
	    Con_DPrintf("Warning: Connection reset by peer %s in %s\n",
			NET_AdrToString(net_from), __func__);
	    return false;
	}
	if (err == WSAEMSGSIZE) {
	    Con_Printf("Warning:  Oversize packet from %s\n",
		       NET_AdrToString(net_from));
	    return false;
	}
	Sys_Error("%s: WSAGetLastError == %i", __func__, err);
    }

    net_message.cursize = ret;
    if (ret == sizeof(net_message_buffer)) {
	Con_Printf("Oversize packet from %s\n", NET_AdrToString(net_from));
	return false;
    }

    return ret;
}


void
NET_SendPacket(int length, void *data, netadr_t to)
{
    int ret;
    struct sockaddr_in addr;

    NetadrToSockadr(&to, &addr);

    ret =
	sendto(net_socket, data, length, 0, (struct sockaddr *)&addr,
	       sizeof(addr));
    if (ret == -1) {
	int err = WSAGetLastError();

	/* wouldblock is silent */
	if (err == WSAEWOULDBLOCK)
	    return;

#ifndef SERVERONLY
	if (err == WSAEADDRNOTAVAIL)
	    Con_DPrintf("%s Warning: %i\n", __func__, err);
	else
#endif
	    Con_Printf("%s ERROR: %i\n", __func__, err);
    }
}


static int
UDP_OpenSocket(int port)
{
    int newsocket;
    struct sockaddr_in address;
    u_long _true = 1;
    int i;

    if ((newsocket = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == -1)
	Sys_Error("%s: socket: %s", __func__, strerror(errno));

    if (ioctlsocket(newsocket, FIONBIO, &_true) == -1)
	Sys_Error("%s: ioctl FIONBIO: %s", __func__, strerror(errno));

    address.sin_family = AF_INET;
    /* ZOID -- check for interface binding option */
    i = COM_CheckParm("-ip");
    if (i && i < com_argc - 1) {
	address.sin_addr.s_addr = inet_addr(com_argv[i + 1]);
	Con_Printf("Binding to IP Interface Address of %s\n",
		   inet_ntoa(address.sin_addr));
    } else
	address.sin_addr.s_addr = INADDR_ANY;

    if (port == PORT_ANY)
	address.sin_port = 0;
    else
	address.sin_port = htons((short)port);
    if (bind(newsocket, (struct sockaddr *)&address, sizeof(address)) == -1)
	Sys_Error("%s: bind: %s", __func__, strerror(errno));

    return newsocket;
}

void
NET_GetLocalAddress(void)
{
    char buff[512];
    struct sockaddr_in address;
    int namelen;

    gethostname(buff, 512);
    buff[512 - 1] = 0;

    NET_StringToAdr(buff, &net_local_adr);

    namelen = sizeof(address);
    if (getsockname(net_socket, (struct sockaddr *)&address, &namelen) == -1)
	Sys_Error("%s: getsockname: %s", __func__, strerror(errno));
    net_local_adr.port = address.sin_port;

    Con_Printf("IP address %s\n", NET_AdrToString(net_local_adr));
}

/*
 * ====================
 * NET_Init
 * ====================
 */
void
NET_Init(int port)
{
    int r;

    r = WSAStartup(MAKEWORD(1, 1), &winsockdata);

    if (r)
	Sys_Error("Winsock initialization failed.");

    /*
     * open the single socket to be used for all communications
     */
    net_socket = UDP_OpenSocket(port);

    /*
     * init the message buffer
     */
    net_message.maxsize = sizeof(net_message_buffer);
    net_message.data = net_message_buffer;

    /*
     * determine my name & address
     */
    NET_GetLocalAddress();

    Con_Printf("UDP Initialized\n");
}

/*
 * ====================
 * NET_Shutdown
 * ====================
 */
void
NET_Shutdown(void)
{
    closesocket(net_socket);
    WSACleanup();
}
