/*
	sv_sys_unix.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 2000       Marcus Sundberg [mackan@stacken.kth.se]

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <sys/types.h>
#ifdef HAVE_STRINGS_H
#include <strings.h>
#endif
#include "qargs.h"
#include "cvar.h"
#include "server.h"
#include "sys.h"

#ifdef NeXT
#include <libc.h>
#endif

#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#ifdef HAVE_STRING_H
#include <string.h>
#endif


cvar_t	*sys_extrasleep;

qboolean	is_server = true;
qboolean	stdin_ready;

#define BASEDIR	"."


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

				REQUIRED SYS FUNCTIONS

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

/*
================
Sys_Error
================
*/
void Sys_Error (char *error, ...)
{
	va_list		argptr;
	char		string[1024];
	
	va_start (argptr, error);
	vsnprintf (string, sizeof(string), error,argptr);
	va_end (argptr);
	printf ("Fatal error: %s\n",string);
	
	exit (1);
}


/*
================
Sys_Quit
================
*/
void Sys_Quit (void)
{
	exit (0);		// appkit isn't running
}

static int do_stdin = 1;

/*
================
Sys_ConsoleInput

Checks for a complete line of text typed in at the console, then forwards
it to the host command processor
================
*/
char *Sys_ConsoleInput (void)
{
	static char	text[256];
	int		len;

	if (!stdin_ready || !do_stdin)
		return NULL;		// the select didn't say it was ready
	stdin_ready = false;

	len = read (0, text, sizeof(text));
	if (len == 0) {
		// end of file
		do_stdin = 0;
		return NULL;
	}
	if (len < 1)
		return NULL;
	text[len-1] = 0;	// rip off the /n and terminate
	
	return text;
}

/*
=============
Sys_Init

Quake calls this so the system can register variables before host_hunklevel
is marked
=============
*/
void Sys_Init_Cvars (void)
{
	sys_nostdout = Cvar_Get("sys_nostdout", "0", CVAR_NONE, "None");
	sys_extrasleep = Cvar_Get("sys_extrasleep", "0", CVAR_NONE, "None");
}

void
Sys_Init (void)
{
#ifdef USE_INTEL_ASM
	Sys_SetFPCW();
#endif
}

/*
=============
main
=============
*/
int main(int argc, char *argv[])
{
	double			time, oldtime, newtime;
	quakeparms_t	parms;
	fd_set	fdset;
	extern	int		net_socket;
    struct timeval timeout;
	int j;

	memset (&parms, 0, sizeof(parms));

	COM_InitArgv (argc, argv);	
	parms.argc = com_argc;
	parms.argv = com_argv;

	parms.memsize = 16*1024*1024;

	j = COM_CheckParm("-mem");
	if (j)
		parms.memsize = (int) (atof(com_argv[j+1]) * 1024 * 1024);
	if ((parms.membase = malloc (parms.memsize)) == NULL)
		Sys_Error("Can't allocate %d\n", parms.memsize);

	parms.basedir = BASEDIR;

	SV_Init (&parms);

	// run one frame immediately for first heartbeat
	SV_Frame (0.1);		

	//
	// main loop
	//
	oldtime = Sys_DoubleTime () - 0.1;
	while (1) {
		// select on the net socket and stdin
		// the only reason we have a timeout at all is so that if the last
		// connected client times out, the message would not otherwise
		// be printed until the next event.
		FD_ZERO(&fdset);
		if (do_stdin)
			FD_SET(0, &fdset);
		FD_SET(net_socket, &fdset);
		timeout.tv_sec = 1;
		timeout.tv_usec = 0;
		if (select (net_socket+1, &fdset, NULL, NULL, &timeout) == -1)
			continue;
		stdin_ready = FD_ISSET(0, &fdset);

		// find time passed since last cycle
		newtime = Sys_DoubleTime ();
		time = newtime - oldtime;
		oldtime = newtime;
		
		SV_Frame (time);		
		
		// extrasleep is just a way to generate a fucked up connection on
		// purpose
		if (sys_extrasleep->int_val)
			usleep (sys_extrasleep->int_val);
	}	
	return 1;
}