/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2005 John Fitzgibbons and others
Copyright (C) 2007-2008 Kristian Duske

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 "quakedef.h"

#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <time.h>

#include "SDL.h"


qboolean		isDedicated;
cvar_t		sys_throttle = {"sys_throttle", "0.02", true};

#define	MAX_HANDLES		32	/* johnfitz -- was 10 */
static FILE		*sys_handles[MAX_HANDLES];


static int findhandle (void)
{
	int i;

	for (i = 1; i < MAX_HANDLES; i++)
	{
		if (!sys_handles[i])
			return i;
	}
	Sys_Error ("out of handles");
	return -1;
}

long Sys_filelength (FILE *f)
{
	long		pos, end;

	pos = ftell (f);
	fseek (f, 0, SEEK_END);
	end = ftell (f);
	fseek (f, pos, SEEK_SET);

	return end;
}

int Sys_FileOpenRead (const char *path, int *hndl)
{
	FILE	*f;
	int	i, retval;

	i = findhandle ();
	f = fopen(path, "rb");

	if (!f)
	{
		*hndl = -1;
		retval = -1;
	}
	else
	{
		sys_handles[i] = f;
		*hndl = i;
		retval = Sys_filelength(f);
	}

	return retval;
}

int Sys_FileOpenWrite (const char *path)
{
	FILE	*f;
	int		i;

	i = findhandle ();
	f = fopen(path, "wb");

	if (!f)
		Sys_Error ("Error opening %s: %s", path, strerror(errno));

	sys_handles[i] = f;
	return i;
}

void Sys_FileClose (int handle)
{
	fclose (sys_handles[handle]);
	sys_handles[handle] = NULL;
}

void Sys_FileSeek (int handle, int position)
{
	fseek (sys_handles[handle], position, SEEK_SET);
}

int Sys_FileRead (int handle, void *dest, int count)
{
	return fread (dest, 1, count, sys_handles[handle]);
}

int Sys_FileWrite (int handle, const void *data, int count)
{
	return fwrite (data, 1, count, sys_handles[handle]);
}

int Sys_FileTime (const char *path)
{
	FILE	*f;

	f = fopen(path, "rb");

	if (f)
	{
		fclose(f);
		return 1;
	}

	return -1;
}

void Sys_Init (void)
{
	host_parms->userdir = host_parms->basedir; /* TODO: implement properly! */
}

void Sys_mkdir (const char *path)
{
	int rc = mkdir (path, 0777);
	if (rc != 0 && errno == EEXIST)
		rc = 0;
	if (rc != 0)
	{
		rc = errno;
		Sys_Error("Unable to create directory %s: %s", path, strerror(rc));
	}
}

static const char errortxt1[] = "\nERROR-OUT BEGIN\n\n";
static const char errortxt2[] = "\nQUAKE ERROR: ";

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

	fputs (errortxt1, stderr);

	Host_Shutdown ();

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

	fputs (errortxt2, stderr);
	fputs (text, stderr);
	fputs ("\n\n", stderr);
	if (!isDedicated)
		PL_ErrorDialog(text);

	exit (1);
}

void Sys_Printf (const char *fmt, ...)
{
	va_list argptr;

	va_start(argptr, fmt);
	vprintf(fmt, argptr);
	va_end(argptr);
}

void Sys_Quit (void)
{
	Host_Shutdown();

	exit (0);
}

double Sys_DoubleTime (void)
{
	return SDL_GetTicks() / 1000.0;
}

const char *Sys_ConsoleInput (void)
{
	static char	con_text[256];
	static int	textlen;
	char		c;
	fd_set		set;
	struct timeval	timeout;

	FD_ZERO (&set);
	FD_SET (0, &set);	// stdin
	timeout.tv_sec = 0;
	timeout.tv_usec = 0;

	while (select (1, &set, NULL, NULL, &timeout))
	{
		read (0, &c, 1);
		if (c == '\n' || c == '\r')
		{
			con_text[textlen] = '\0';
			textlen = 0;
			return con_text;
		}
		else if (c == 8)
		{
			if (textlen)
			{
				textlen--;
				con_text[textlen] = '\0';
			}
			continue;
		}
		con_text[textlen] = c;
		textlen++;
		if (textlen < sizeof(con_text))
			con_text[textlen] = '\0';
		else
		{
		// buffer is full
			textlen = 0;
			con_text[0] = '\0';
			Sys_Printf("\nConsole input too long!\n");
			break;
		}
	}

	return NULL;
}

void Sys_Sleep (unsigned long msecs)
{
/*	usleep (msecs * 1000);*/
	SDL_Delay (msecs);
}

void Sys_SendKeyEvents (void)
{
	IN_SendKeyEvents();
}

void Sys_LowFPPrecision (void)
{
}

void Sys_HighFPPrecision (void)
{
}

void Sys_SetFPCW (void)
{
}