/*
	sys_win.c

	(description)

	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:

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

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <stdlib.h>
#include <ctype.h>
#include <winsock.h>
#include <conio.h>

#include "qargs.h"
#include "cvar.h"
#include "server.h"
#include "sys.h"


qboolean    is_server = true;
qboolean    WinNT;

extern cvar_t *sys_nostdout;
cvar_t     *sys_sleep;

/*
================
Sys_FileTime
================
*/
int
Sys_FileTime (char *path)
{
	QFile      *f;

	f = Qopen (path, "rb");
	if (f) {
		Qclose (f);
		return 1;
	}

	return -1;
}


/*
================
Sys_Error
================
*/
void
Sys_Error (char *error, ...)
{
	va_list     argptr;
	char        text[1024];

	va_start (argptr, error);
	vsnprintf (text, sizeof (text), error, argptr);
	va_end (argptr);

//    MessageBox(NULL, text, "Error", 0 /* MB_OK */ );
	printf ("ERROR: %s\n", text);

	exit (1);
}


/*
================
Sys_ConsoleInput
================
*/
char       *
Sys_ConsoleInput (void)
{
	static char text[256];
	static int  len;
	int         c;

	// read a line out
	while (kbhit ()) {
		c = _getch ();
		putch (c);
		if (c == '\r') {
			text[len] = 0;
			putch ('\n');
			len = 0;
			return text;
		}
		if (c == 8) {
			if (len) {
				putch (' ');
				putch (c);
				len--;
				text[len] = 0;
			}
			continue;
		}
		text[len] = c;
		len++;
		text[len] = 0;
		if (len == sizeof (text))
			len = 0;
	}

	return NULL;
}

/*
================
Sys_Quit
================
*/
void
Sys_Quit (void)
{
#ifdef PACKET_LOGGING
        Net_LogStop();
#endif
	exit (0);
}

/*
=============
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, "Toggle console output");
	sys_sleep = Cvar_Get ("sys_sleep", "8", CVAR_NONE, 
		"Sleep how long in seconds between checking for connections. minimum is 0, maximum is 13");
}

void
Sys_Init (void)
{
	OSVERSIONINFO vinfo;

#ifdef USE_INTEL_ASM
	Sys_SetFPCW ();
#endif
	// make sure the timer is high precision, otherwise
	// NT gets 18ms resolution
	timeBeginPeriod (1);

	vinfo.dwOSVersionInfoSize = sizeof (vinfo);

	if (!GetVersionEx (&vinfo))
		Sys_Error ("Couldn't get OS info");

	if ((vinfo.dwMajorVersion < 4) ||
		(vinfo.dwPlatformId == VER_PLATFORM_WIN32s)) {
		Sys_Error (PROGRAM " requires at least Win95 or NT 4.0");
	}

	if (vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT)
		WinNT = true;
	else
		WinNT = false;
}

/*
==================
main

==================
*/
char       *newargv[256];

int
main (int argc, char **argv)
{
	double      newtime, time, oldtime;
	struct timeval timeout;
	fd_set      fdset;
	int         t;
	int         sleep_msec;

	COM_InitArgv (argc, argv);

	host_parms.argc = com_argc;
	host_parms.argv = com_argv;

	host_parms.memsize = 16 * 1024 * 1024;

	if ((t = COM_CheckParm ("-heapsize")) != 0 && t + 1 < com_argc)
		host_parms.memsize = atoi (com_argv[t + 1]) * 1024;

	if ((t = COM_CheckParm ("-mem")) != 0 && t + 1 < com_argc)
		host_parms.memsize = atoi (com_argv[t + 1]) * 1024 * 1024;

	host_parms.membase = malloc (host_parms.memsize);

	if (!host_parms.membase)
		Sys_Error ("Insufficient memory.\n");

	SV_Init ();

	if (COM_CheckParm ("-nopriority")) {
		Cvar_Set (sys_sleep, "0");
	} else {
		if (!SetPriorityClass (GetCurrentProcess (), HIGH_PRIORITY_CLASS))
			Con_Printf ("SetPriorityClass() failed\n");
		else
			Con_Printf ("Process priority class set to HIGH\n");
	}

	// sys_sleep > 0 seems to cause packet loss on WinNT (why?)
	if (WinNT)
		Cvar_Set (sys_sleep, "0");

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

//
// main loop
//
	oldtime = Sys_DoubleTime () - 0.1;
	while (1) {
		// Now we want to give some processing time to other applications,
		// such as qw_client, running on this machine.
		sleep_msec = sys_sleep->int_val;
		if (sleep_msec > 0) {
			if (sleep_msec > 13)
				sleep_msec = 13;
			Sleep (sleep_msec);
		}
		// 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);
		FD_SET (net_socket, &fdset);
		timeout.tv_sec = 0;
		timeout.tv_usec = 100;
		if (select (net_socket + 1, &fdset, NULL, NULL, &timeout) == -1)
			continue;

		// find time passed since last cycle
		newtime = Sys_DoubleTime ();
		time = newtime - oldtime;
		oldtime = newtime;

		SV_Frame (time);
	}

	return true;
}