/*
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 "qwsvdef.h"

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

#if defined(__linux__) || defined(sun)
#include <sys/stat.h>
#include <unistd.h>
#include <sys/time.h>
#include <errno.h>
#else
#include <sys/dir.h>
#endif

cvar_t	sys_nostdout = {"sys_nostdout","0"};
cvar_t	sys_extrasleep = {"sys_extrasleep","0"};

qboolean	stdin_ready;

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

				REQUIRED SYS FUNCTIONS

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

/*
============
Sys_FileTime

returns -1 if not present
============
*/
int	Sys_FileTime (char *path)
{
	struct	stat	buf;
	
	if (stat (path,&buf) == -1)
		return -1;
	
	return buf.st_mtime;
}


/*
============
Sys_mkdir

============
*/
void Sys_mkdir (char *path)
{
	if (mkdir (path, 0777) != -1)
		return;
	if (errno != EEXIST)
		Sys_Error ("mkdir %s: %s",path, strerror(errno)); 
}


/*
================
Sys_DoubleTime
================
*/
double Sys_DoubleTime (void)
{
	struct timeval tp;
	struct timezone tzp;
	static int		secbase;

	gettimeofday(&tp, &tzp);
	
	if (!secbase)
	{
		secbase = tp.tv_sec;
		return tp.tv_usec/1000000.0;
	}
	
	return (tp.tv_sec - secbase) + tp.tv_usec/1000000.0;
}

/*
================
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_Printf
================
*/
void Sys_Printf (char *fmt, ...) {
	va_list argptr;
	static char text[2048];
	unsigned char *p;

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

	if (strlen(text) > sizeof(text))
		Sys_Error("memory overwrite in Sys_Printf");

    if (sys_nostdout.value)
        return;

	for (p = (unsigned char *)text; *p; p++) {
		*p &= 0x7f;
		if ((*p > 128 || *p < 32) && *p != 10 && *p != 13 && *p != 9)
			printf("[%02x]", *p);
		else
			putc(*p, stdout);
	}
	fflush(stdout);
}


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

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 (void)
{
	Cvar_Register (&sys_nostdout);
	Cvar_Register (&sys_extrasleep);
}

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

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

//
// main loop
//
	oldtime = Sys_DoubleTime () - 0.1;
	while (1)
	{
	// select on the net socket and stdin
		NET_Sleep (10);

	// find time passed since last cycle
		newtime = Sys_DoubleTime ();
		time = newtime - oldtime;
		oldtime = newtime;
		
		Host_Frame (time);		
		
	// extrasleep is just a way to generate a fucked up connection on purpose
		if (sys_extrasleep.value)
			usleep (sys_extrasleep.value);
	}	
}