/*
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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

*/

// net_watt.c by sezero
// net_udp code using Watt-32 library

#include "../qcommon/qcommon.h"

#include <sys/types.h>
#include <errno.h>
#include <stddef.h>
#include <limits.h>
#include <sys/time.h> /* struct timeval */
#include <stdio.h>
#include <stdlib.h>

#include <sys/param.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <tcp.h>		/* for select_s(), sock_init() & friends. */

extern int	_watt_do_exit;	/* in sock_ini.h, but not in public headers. */


netadr_t	net_local_adr;

#define	LOOPBACK	0x7f000001

#define	MAX_LOOPBACK	4

typedef struct
{
	byte	data[MAX_MSGLEN];
	int		datalen;
} loopmsg_t;

typedef struct
{
	loopmsg_t	msgs[MAX_LOOPBACK];
	int			get, send;
} loopback_t;

loopback_t	loopbacks[2];
int			ip_sockets[2];
int			ipx_sockets[2];

int NET_Socket (char *net_interface, int port);

//=============================================================================

void NetadrToSockadr (netadr_t *a, struct sockaddr_in *s)
{
	memset (s, 0, sizeof(*s));

	if (a->type == NA_BROADCAST)
	{
		s->sin_family = AF_INET;

		s->sin_port = a->port;
		s->sin_addr.s_addr = INADDR_BROADCAST;
	}
	else if (a->type == NA_IP)
	{
		s->sin_family = AF_INET;

	//	*(int *)&s->sin_addr = *(int *)&a->ip;
		memcpy (&s->sin_addr, a->ip, 4);
		s->sin_port = a->port;
	}
}

void SockadrToNetadr (struct sockaddr_in *s, netadr_t *a)
{
//	*(int *)&a->ip = *(int *)&s->sin_addr;
	memcpy (a->ip, &s->sin_addr, 4);
	a->port = s->sin_port;
	a->type = NA_IP;
}


qboolean	NET_CompareAdr (netadr_t a, netadr_t b)
{
	if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3] && a.port == b.port)
	{
		return true;
	}

	return false;
}

/*
===================
NET_CompareBaseAdr

Compares without the port
===================
*/
qboolean	NET_CompareBaseAdr (netadr_t a, netadr_t b)
{
	if (a.type != b.type)
	{
		return false;
	}

	if (a.type == NA_LOOPBACK)
	{
		return true;
	}

	if (a.type == NA_IP)
	{
		if (a.ip[0] == b.ip[0] && a.ip[1] == b.ip[1] && a.ip[2] == b.ip[2] && a.ip[3] == b.ip[3])
		{
			return true;
		}
		return false;
	}

	if (a.type == NA_IPX)
	{
		if ((memcmp(a.ipx, b.ipx, 10) == 0))
		{
			return true;
		}
		return false;
	}

	return false; /* silence compiler */
}

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

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

	return s;
}

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

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

	return s;
}

/*
=============
NET_StringToAdr

localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean	NET_StringToSockaddr (const char *s, struct sockaddr *sadr)
{
	struct hostent	*h;
	char	*colon;
	char	copy[128];

	memset (sadr, 0, sizeof(*sadr));
	((struct sockaddr_in *)sadr)->sin_family = AF_INET;
	((struct sockaddr_in *)sadr)->sin_port = 0;

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

	if (copy[0] >= '0' && copy[0] <= '9')
	{
		((struct sockaddr_in *)sadr)->sin_addr.s_addr = inet_addr(copy);
	}
	else
	{
		if (! (h = gethostbyname(copy)) )
			return false;
		((struct sockaddr_in *)sadr)->sin_addr.s_addr = *(u_long *)h->h_addr_list[0];
	}

	return true;
}

/*
=============
NET_StringToAdr

localhost
idnewt
idnewt:28000
192.246.40.70
192.246.40.70:28000
=============
*/
qboolean	NET_StringToAdr (const char *s, netadr_t *a)
{
	struct sockaddr_in sadr;

	if (!strcmp (s, "localhost"))
	{
		memset (a, 0, sizeof(*a));
		a->type = NA_LOOPBACK;
		return true;
	}

	if (!NET_StringToSockaddr (s, (struct sockaddr *)&sadr))
	{
		return false;
	}

	SockadrToNetadr (&sadr, a);

	return true;
}


qboolean	NET_IsLocalAddress (netadr_t adr)
{
	return NET_CompareAdr (adr, net_local_adr);
}

/*
=============================================================================

LOOPBACK BUFFERS FOR LOCAL PLAYER

=============================================================================
*/

qboolean	NET_GetLoopPacket (netsrc_t sock, netadr_t *net_from, sizebuf_t *net_message)
{
	int		i;
	loopback_t	*loop;

	loop = &loopbacks[sock];

	if (loop->send - loop->get > MAX_LOOPBACK)
	{
		loop->get = loop->send - MAX_LOOPBACK;
	}

	if (loop->get >= loop->send)
	{
		return false;
	}

	i = loop->get & (MAX_LOOPBACK-1);
	loop->get++;

	memcpy (net_message->data, loop->msgs[i].data, loop->msgs[i].datalen);
	net_message->cursize = loop->msgs[i].datalen;
	*net_from = net_local_adr;

	return true;
}


void NET_SendLoopPacket (netsrc_t sock, int length, void *data, netadr_t to)
{
	int		i;
	loopback_t	*loop;

	loop = &loopbacks[sock^1];

	i = loop->send & (MAX_LOOPBACK-1);
	loop->send++;

	memcpy (loop->msgs[i].data, data, length);
	loop->msgs[i].datalen = length;
}

//=============================================================================

qboolean	NET_GetPacket (netsrc_t sock, netadr_t *net_from, sizebuf_t *net_message)
{
	int 	ret;
	struct sockaddr_in	from;
	int		fromlen;
	int		net_socket;
	int		protocol;

	if (NET_GetLoopPacket (sock, net_from, net_message))
	{
		return true;
	}

	for (protocol = 0 ; protocol < 2 ; protocol++)
	{
		if (protocol == 0)
		{
			net_socket = ip_sockets[sock];
		}
		else
		{
			net_socket = ipx_sockets[sock];
		}
		if (!net_socket)
		{
			continue;
		}

		fromlen = sizeof(from);
		ret = recvfrom(net_socket, net_message->data, net_message->maxsize, 0,
				(struct sockaddr *)&from, &fromlen);

		if (ret == SOCKET_ERROR)
		{
			if (errno == EWOULDBLOCK || errno == ECONNREFUSED)
				continue;
			Com_Printf ("NET_GetPacket: %s", NET_ErrorString());
			continue;
		}

		if (ret == net_message->maxsize)
		{
			Com_Printf ("Oversize packet from %s\n", NET_AdrToString (*net_from));
			continue;
		}

		net_message->cursize = ret;
		SockadrToNetadr (&from, net_from);

		return true;
	}

	return false;
}

//=============================================================================

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

	if (to.type == NA_LOOPBACK)
	{
		NET_SendLoopPacket (sock, length, data, to);
		return;
	}

	if (to.type == NA_BROADCAST)
	{
		net_socket = ip_sockets[sock];
		if (!net_socket) return;
	}
	else if (to.type == NA_IP)
	{
		net_socket = ip_sockets[sock];
		if (!net_socket) return;
	}
	else if (to.type == NA_IPX)
	{
		net_socket = ipx_sockets[sock];
		if (!net_socket) return;
	}
	else if (to.type == NA_BROADCAST_IPX)
	{
		net_socket = ipx_sockets[sock];
		if (!net_socket) return;
	}
	else
	{
		net_socket = INVALID_SOCKET; /* silence compiler */
		Com_Error (ERR_FATAL, "NET_SendPacket: bad address type");
	}

	NetadrToSockadr (&to, &addr);

	ret = sendto (net_socket, data, length, 0,
				(struct sockaddr *)&addr, sizeof(addr) );
	if (ret == SOCKET_ERROR)
	{
		Com_Printf ("NET_SendPacket ERROR: %s\n", NET_ErrorString());
	}
}


//=============================================================================


/*
====================
NET_OpenIP
====================
*/
void NET_OpenIP (void)
{
	cvar_t	*port, *ip;

	port = Cvar_Get ("port", va("%i", PORT_SERVER), CVAR_NOSET);
	ip = Cvar_Get ("ip", "localhost", CVAR_NOSET);

	if (!ip_sockets[NS_SERVER])
	{
		ip_sockets[NS_SERVER] = NET_Socket (ip->string, port->value);
	}

	if (!ip_sockets[NS_CLIENT])
	{
		ip_sockets[NS_CLIENT] = NET_Socket (ip->string, PORT_ANY);
	}
}

/*
====================
NET_OpenIPX
====================
*/
void NET_OpenIPX (void)
{
}


/*
====================
NET_Config

A single player game will only use the loopback code
====================
*/
void	NET_Config (qboolean multiplayer)
{
	int		i;

	if (!multiplayer)
	{	// shut down any existing sockets
		for (i = 0; i < 2; i++)
		{
			if (ip_sockets[i])
			{
				closesocket (ip_sockets[i]);
				ip_sockets[i] = 0;
			}

			if (ipx_sockets[i])
			{
				closesocket (ipx_sockets[i]);
				ipx_sockets[i] = 0;
			}
		}
	}
	else
	{	// open sockets
		NET_OpenIP ();
		NET_OpenIPX ();
	}
}


//===================================================================


/*
====================
NET_Init
====================
*/
void NET_Init (void)
{
	int i, err;

/*	dbug_init();*/

	i = _watt_do_exit;
	_watt_do_exit = 0;
	err = sock_init();
	_watt_do_exit = i;

	if (err != 0)
	{
		Com_Printf("WATTCP initialization failed (%s)\n", sock_init_err(err));
	}
	else
	{
		Com_Printf("WATTCP Initialized\n");
	}
}


/*
====================
NET_Socket
====================
*/
int NET_Socket (char *net_interface, int port)
{
	int newsocket;
	struct sockaddr_in address;
	u_long _true = 1;
	int	i = 1;

	if ((newsocket = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
	{
		Com_Printf ("ERROR: UDP_OpenSocket: socket: %s\n", NET_ErrorString());
		return 0;
	}

	// make it non-blocking
	if (ioctlsocket (newsocket, FIONBIO, (char *) &_true) == SOCKET_ERROR)
	{
		Com_Printf ("ERROR: UDP_OpenSocket: ioctl FIONBIO: %s\n", NET_ErrorString());
		return 0;
	}

	// make it broadcast capable
	if (setsockopt(newsocket, SOL_SOCKET, SO_BROADCAST, (char *)&i, sizeof(i)) == SOCKET_ERROR)
	{
		Com_Printf ("ERROR: UDP_OpenSocket: setsockopt SO_BROADCAST: %s\n", NET_ErrorString());
		return 0;
	}

	if (!net_interface || !net_interface[0] || !Q_stricmp(net_interface, "localhost"))
	{
		address.sin_addr.s_addr = INADDR_ANY;
	}
	else
	{
		NET_StringToSockaddr (net_interface, (struct sockaddr *)&address);
	}

	if (port == PORT_ANY)
	{
		address.sin_port = 0;
	}
	else
	{
		address.sin_port = htons((short)port);
	}

	address.sin_family = AF_INET;

	if( bind (newsocket, (const struct sockaddr *)&address, sizeof(address)) == SOCKET_ERROR)
	{
		Com_Printf ("ERROR: UDP_OpenSocket: bind: %s\n", NET_ErrorString());
		closesocket (newsocket);
		return 0;
	}

	return newsocket;
}


/*
====================
NET_Shutdown
====================
*/
void	NET_Shutdown (void)
{
	NET_Config (false);	// close sockets
}


/*
====================
NET_ErrorString
====================
*/
const char *NET_ErrorString (void)
{
	return strerror (errno);
}

// sleeps msec or until net socket is ready
void NET_Sleep(int msec)
{
	struct timeval timeout;
	fd_set	fdset;
	extern cvar_t *dedicated;

	/* FS: ip_sockets[] won't start until a map is actually loaded. */
	if (/*!ip_sockets[NS_SERVER] || */(dedicated && !dedicated->value))
	{
		return; // we're not a server, just run full speed
	}

	FD_ZERO(&fdset);
	FD_SET(ip_sockets[NS_SERVER], &fdset); // network socket
	timeout.tv_sec = (long)msec/1000;
	timeout.tv_usec = ((long)msec%1000)*1000;
	select_s(ip_sockets[NS_SERVER]+1, &fdset, NULL, NULL, &timeout);
}

