#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <limits.h>
#include <sys/time.h>
#include <sys/types.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
#include <ctype.h>
#include <sys/wait.h>
#include <errno.h>

#include <sc.h>

#include "quakedef.h"

qboolean			isDedicated;

int nostdout = 0;

char *basedir = ".";
char *cachedir = "/tmp";

cvar_t  sys_linerefresh = {"sys_linerefresh","0"};// set for entity display

// =======================================================================
// General routines
// =======================================================================

void Sys_DebugNumber(int y, int val)
{
}

void Sys_Printf (char *fmt, ...)
{
	va_list		argptr;
	char		text[1024];
	unsigned char		*p;

	va_start (argptr,fmt);
	vsprintf (text,fmt,argptr);
	va_end (argptr);

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

    if (nostdout)
        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);
	}
}

void Sys_Quit (void)
{
	Host_Shutdown();
	fflush(stdout);
	exit(0);
}

void Sys_Init(void)
{
}

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

	va_start (argptr,error);
	vsprintf (string,error,argptr);
	va_end (argptr);
	fprintf(stderr, "Error: %s\n", string);

	Host_Shutdown ();
	
	while(1) { _sc_pause(); }
	
	exit (1);
} 

void Sys_Warn (char *warning, ...)
{ 
	va_list     argptr;
	char        string[1024];

	va_start (argptr,warning);
	vsprintf (string,warning,argptr);
	va_end (argptr);
	
	fprintf(stderr, "Warning: %s", string);
} 

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


void Sys_mkdir (char *path)
{
    mkdir (path, 0777);
}

int Sys_FileOpenRead (char *path, int *handle)
{
	int	h;
	struct stat	fileinfo;
    
	
	h = open (path, O_RDONLY, 0666);
	*handle = h;
	if (h == -1)
		return -1;
	
	if (fstat (h,&fileinfo) == -1)
		Sys_Error ("Error fstating %s", path);

	return fileinfo.st_size;
}

int Sys_FileOpenWrite (char *path)
{
	int     handle;

	umask (0);
	
	handle = open(path,O_RDWR | O_CREAT | O_TRUNC
	, 0666);

	if (handle == -1)
		Sys_Error ("Error opening %s: %s", path,strerror(errno));

	return handle;
}

int Sys_FileWrite (int handle, void *src, int count)
{
	return write (handle, src, count);
}

void Sys_FileClose (int handle)
{
	close (handle);
}

void Sys_FileSeek (int handle, int position)
{
	lseek (handle, position, SEEK_SET);
}

int Sys_FileRead (int handle, void *dest, int count)
{
    return read (handle, dest, count);
}

void Sys_DebugLog(char *file, char *fmt, ...)
{
    va_list argptr; 
    static char data[1024];
    int fd;
    
    va_start(argptr, fmt);
    vsprintf(data, fmt, argptr);
    va_end(argptr);
    fd = open(file, O_WRONLY | O_CREAT | O_APPEND, 0666);
    write(fd, data, strlen(data));
    close(fd);
}

void Sys_EditFile(char *filename)
{

	char cmd[256];
	char *term;
	char *editor;

	term = getenv("TERM");
	if (term && !strcmp(term, "xterm"))
	{
		editor = getenv("VISUAL");
		if (!editor)
			editor = getenv("EDITOR");
		if (!editor)
			editor = getenv("EDIT");
		if (!editor)
			editor = "vi";
		sprintf(cmd, "xterm -e %s %s", editor, filename);
		system(cmd);
	}

}

double Sys_FloatTime_Cached_Value = 0;
int Sys_FloatTime_Cached_Valid = 0;

double Sys_FloatTime (void)
{
	if(!Sys_FloatTime_Cached_Valid)
	{
		Sys_FloatTime_Cached_Value = _sc_getticks() / 1000.0;
	}
	
	return Sys_FloatTime_Cached_Value;
}

// =======================================================================
// Sleeps for microseconds
// =======================================================================

static volatile int oktogo;

void alarm_handler(int x)
{
	oktogo=1;
}

void Sys_LineRefresh(void)
{
}

void floating_point_exception_handler(int whatever)
{
//	Sys_Warn("floating point exception\n");
	signal(SIGFPE, floating_point_exception_handler);
}

char *Sys_ConsoleInput(void)
{
	return NULL;
}

#if !id386
void Sys_HighFPPrecision (void)
{
}

void Sys_LowFPPrecision (void)
{
}
#endif

int main (int c, char **v)
{

	double		time, oldtime, newtime;
	quakeparms_t parms;
	extern int vcrFile;
	extern int recording;
	int j;

//	static char cwd[1024];

//	signal(SIGFPE, floating_point_exception_handler);
	signal(SIGFPE, SIG_IGN);

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

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

#ifdef GLQUAKE
	parms.memsize = 16*1024*1024;
#else
	parms.memsize = 8*1024*1024;
#endif

	j = COM_CheckParm("-mem");
	if (j)
		parms.memsize = (int) (Q_atof(com_argv[j+1]) * 1024 * 1024);
	parms.membase = malloc (parms.memsize);

	parms.basedir = basedir;
// caching is disabled by default, use -cachedir to enable
//	parms.cachedir = cachedir;

//	fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);

    Host_Init(&parms);

	Sys_Init();

	if (COM_CheckParm("-nostdout"))
		nostdout = 1;
	else {
		//fcntl(0, F_SETFL, fcntl (0, F_GETFL, 0) | FNDELAY);
		printf ("Linux Quake -- Version %0.3f\n", LINUX_VERSION);
	}

    oldtime = Sys_FloatTime () - 0.1;
    while (1)
    {
// find time spent rendering last frame
        newtime = Sys_FloatTime ();
        time = newtime - oldtime;

        if (cls.state == ca_dedicated)
        {   // play vcrfiles at max speed
            if (time < sys_ticrate.value && (vcrFile == -1 || recording) )
            {
				_sc_getticks(); _sc_pause();
                continue;       // not time to run a server only tic yet
            }
            time = sys_ticrate.value;
        }

        if (time > sys_ticrate.value*2)
            oldtime = newtime;
        else
            oldtime += time;

        Host_Frame (time);

// graphic debugging aids
        if (sys_linerefresh.value)
            Sys_LineRefresh ();
    }

}


/*
================
Sys_MakeCodeWriteable
================
*/
void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)
{
	(void)startaddr;
	(void)length;
}

