/*
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.

*/
//#include <sys/types.h>
//#include <sys/timeb.h>
#include "qwsvdef.h"
#include <winsock.h>
#include <conio.h>
#include <limits.h>
#include <direct.h>		// _mkdir

cvar_t	sys_sleep = {"sys_sleep", "8"};
cvar_t	sys_nostdout = {"sys_nostdout","0"};

qboolean WinNT;

/*
================
Sys_FileTime
================
*/
int	Sys_FileTime (char *path)
{
	FILE	*f;
	
	f = fopen(path, "rb");
	if (f)
	{
		fclose(f);
		return 1;
	}
	
	return -1;
}

/*
================
Sys_mkdir
================
*/
void Sys_mkdir (char *path)
{
	_mkdir(path);
}


/*
================
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);
}

double Sys_DoubleTime (void)
{
	static DWORD starttime;
	static qboolean first = true;
	DWORD now;

	now = timeGetTime();

	if (first) {
		first = false;
		starttime = now;
		return 0.0;
	}
	
	if (now < starttime) // wrapped?
		return (now / 1000.0) + (LONG_MAX - starttime / 1000.0);

	if (now - starttime == 0)
		return 0.0;

	return (now - starttime) / 1000.0;
}

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

	// read a line out
	while (_kbhit())
	{
		c = _getch();

		if (c == 224) {
			if (_kbhit()) {
				// assume escape sequence (arrows etc), skip
				_getch();
				continue;
			}
			// assume character
		}

		if (c < 32 && c != '\r' && c != 8)
			continue;

		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_Printf
================
*/
void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	
	if (sys_nostdout.value)
		return;
		
	va_start (argptr,fmt);
	vprintf (fmt,argptr);
	va_end (argptr);
}

/*
================
Sys_Quit
================
*/
void Sys_Quit (void)
{
	exit (0);
}


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

Quake calls this so the system can register variables before host_hunklevel
is marked
=============
*/
void Sys_Init (void)
{
	OSVERSIONINFO	vinfo;

	// 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 ("QuakeWorld requires at least Win95 or NT 4.0");
	}

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

	Cvar_Register (&sys_sleep);
	Cvar_Register (&sys_nostdout);

	if (COM_CheckParm ("-nopriority"))
	{
		Cvar_Set (&sys_sleep, "0");
	}
	else
	{
		if ( ! SetPriorityClass (GetCurrentProcess(), HIGH_PRIORITY_CLASS))
			Com_Printf ("SetPriorityClass() failed\n");
		else
			Com_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");
	}
}

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

==================
*/
int main (int argc, char **argv)
{
	double			newtime, time, oldtime;
	int				sleep_msec;

	Host_Init (argc, argv, 16*1024*1024);

//
// main loop
//
	oldtime = Sys_DoubleTime () - 0.1;
	while (1)
	{
		sleep_msec = sys_sleep.value;
		if (sleep_msec > 0)
		{
			if (sleep_msec > 13)
				sleep_msec = 13;
			Sleep (sleep_msec);
		}

		NET_Sleep (1);

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

	return true;
}