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/*

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.

*/

// sys_win.c -- Win32 system interface code

#include "quakedef.h"

#include "winquake.h"

#include "errno.h"

#include "resource.h"

#include "conproc.h"

#define MINIMUM_WIN_MEMORY		0x0880000

#define MAXIMUM_WIN_MEMORY		0x1000000

#define CONSOLE_ERROR_TIMEOUT	60.0	// # of seconds to wait on Sys_Error running

										//  dedicated before exiting

#define PAUSE_SLEEP		50				// sleep time on pause or minimization

#define NOT_FOCUS_SLEEP	20				// sleep time when not focus

int			starttime;

qboolean	ActiveApp, Minimized;

qboolean	WinNT;

static double		pfreq;

static double		curtime = 0.0;

static double		lastcurtime = 0.0;

static int			lowshift;

qboolean			isDedicated;

static qboolean		sc_return_on_enter = false;

HANDLE				hinput, houtput;

static char			*tracking_tag = "Clams & Mooses";

static HANDLE	tevent;

static HANDLE	hFile;

static HANDLE	heventParent;

static HANDLE	heventChild;

void MaskExceptions (void);

void Sys_InitFloatTime (void);

void Sys_PushFPCW_SetHigh (void);

void Sys_PopFPCW (void);

volatile int					sys_checksum;

/*

================

Sys_PageIn

================

*/

void Sys_PageIn (void *ptr, int size)

{

	byte	*x;

	int		j, m, n;

// touch all the memory to make sure it's there. The 16-page skip is to

// keep Win 95 from thinking we're trying to page ourselves in (we are

// doing that, of course, but there's no reason we shouldn't)

	x = (byte *)ptr;

	for (n=0 ; n<4 ; n++)

	{

		for (m=0 ; m<(size - 16 * 0x1000) ; m += 4)

		{

			sys_checksum += *(int *)&x[m];

			sys_checksum += *(int *)&x[m + 16 * 0x1000];

		}

	}

}

/*

===============================================================================

FILE IO

===============================================================================

*/

#define	MAX_HANDLES		10

FILE	*sys_handles[MAX_HANDLES];

int		findhandle (void)

{

	int		i;

	for (i=1 ; i

		if (!sys_handles[i])

			return i;

	Sys_Error ("out of handles");

	return -1;

}

/*

================

filelength

================

*/

int filelength (FILE *f)

{

	int		pos;

	int		end;

	int		t;

	t = VID_ForceUnlockedAndReturnState ();

	pos = ftell (f);

	fseek (f, 0, SEEK_END);

	end = ftell (f);

	fseek (f, pos, SEEK_SET);

	VID_ForceLockState (t);

	return end;

}

int Sys_FileOpenRead (char *path, int *hndl)

{

	FILE	*f;

	int		i, retval;

	int		t;

	t = VID_ForceUnlockedAndReturnState ();

	i = findhandle ();

	f = fopen(path, "rb");

	if (!f)

	{

		*hndl = -1;

		retval = -1;

	}

	else

	{

		sys_handles[i] = f;

		*hndl = i;

		retval = filelength(f);

	}

	VID_ForceLockState (t);

	return retval;

}

int Sys_FileOpenWrite (char *path)

{

	FILE	*f;

	int		i;

	int		t;

	t = VID_ForceUnlockedAndReturnState ();

	i = findhandle ();

	f = fopen(path, "wb");

	if (!f)

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

	sys_handles[i] = f;

	VID_ForceLockState (t);

	return i;

}

void Sys_FileClose (int handle)

{

	int		t;

	t = VID_ForceUnlockedAndReturnState ();

	fclose (sys_handles[handle]);

	sys_handles[handle] = NULL;

	VID_ForceLockState (t);

}

void Sys_FileSeek (int handle, int position)

{

	int		t;

	t = VID_ForceUnlockedAndReturnState ();

	fseek (sys_handles[handle], position, SEEK_SET);

	VID_ForceLockState (t);

}

int Sys_FileRead (int handle, void *dest, int count)

{

	int		t, x;

	t = VID_ForceUnlockedAndReturnState ();

	x = fread (dest, 1, count, sys_handles[handle]);

	VID_ForceLockState (t);

	return x;

}

int Sys_FileWrite (int handle, void *data, int count)

{

	int		t, x;

	t = VID_ForceUnlockedAndReturnState ();

	x = fwrite (data, 1, count, sys_handles[handle]);

	VID_ForceLockState (t);

	return x;

}

int	Sys_FileTime (char *path)

{

	FILE	*f;

	int		t, retval;

	t = VID_ForceUnlockedAndReturnState ();

	f = fopen(path, "rb");

	if (f)

	{

		fclose(f);

		retval = 1;

	}

	else

	{

		retval = -1;

	}

	VID_ForceLockState (t);

	return retval;

}

void Sys_mkdir (char *path)

{

	_mkdir (path);

}

/*

===============================================================================

SYSTEM IO

===============================================================================

*/

/*

================

Sys_MakeCodeWriteable

================

*/

void Sys_MakeCodeWriteable (unsigned long startaddr, unsigned long length)

{

	DWORD  flOldProtect;

	if (!VirtualProtect((LPVOID)startaddr, length, PAGE_READWRITE, &flOldProtect))

   		Sys_Error("Protection change failed\n");

}

#ifndef _M_IX86

void Sys_SetFPCW (void)

{

}

void Sys_PushFPCW_SetHigh (void)

{

}

void Sys_PopFPCW (void)

{

}

void MaskExceptions (void)

{

}

#endif

/*

================

Sys_Init

================

*/

void Sys_Init (void)

{

	LARGE_INTEGER	PerformanceFreq;

	unsigned int	lowpart, highpart;

	OSVERSIONINFO	vinfo;

	MaskExceptions ();

	Sys_SetFPCW ();

	if (!QueryPerformanceFrequency (&PerformanceFreq))

		Sys_Error ("No hardware timer available");

// get 32 out of the 64 time bits such that we have around

// 1 microsecond resolution

	lowpart = (unsigned int)PerformanceFreq.LowPart;

	highpart = (unsigned int)PerformanceFreq.HighPart;

	lowshift = 0;

	while (highpart || (lowpart > 2000000.0))

	{

		lowshift++;

		lowpart >>= 1;

		lowpart |= (highpart & 1) << 31;

		highpart >>= 1;

	}

	pfreq = 1.0 / (double)lowpart;

	Sys_InitFloatTime ();

	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 ("WinQuake requires at least Win95 or NT 4.0");

	}

	if (vinfo.dwPlatformId == VER_PLATFORM_WIN32_NT)

		WinNT = true;

	else

		WinNT = false;

}

void Sys_Error (char *error, ...)

{

	va_list		argptr;

	char		text[1024], text2[1024];

	char		*text3 = "Press Enter to exit\n";

	char		*text4 = "***********************************\n";

	char		*text5 = "\n";

	DWORD		dummy;

	double		starttime;

	static int	in_sys_error0 = 0;

	static int	in_sys_error1 = 0;

	static int	in_sys_error2 = 0;

	static int	in_sys_error3 = 0;

	if (!in_sys_error3)

	{

		in_sys_error3 = 1;

		VID_ForceUnlockedAndReturnState ();

	}

	va_start (argptr, error);

	vsprintf (text, error, argptr);

	va_end (argptr);

	if (isDedicated)

	{

		va_start (argptr, error);

		vsprintf (text, error, argptr);

		va_end (argptr);

		sprintf (text2, "ERROR: %s\n", text);

		WriteFile (houtput, text5, strlen (text5), &dummy, NULL);

		WriteFile (houtput, text4, strlen (text4), &dummy, NULL);

		WriteFile (houtput, text2, strlen (text2), &dummy, NULL);

		WriteFile (houtput, text3, strlen (text3), &dummy, NULL);

		WriteFile (houtput, text4, strlen (text4), &dummy, NULL);

		starttime = Sys_FloatTime ();

		sc_return_on_enter = true;	// so Enter will get us out of here

		while (!Sys_ConsoleInput () &&

				((Sys_FloatTime () - starttime) < CONSOLE_ERROR_TIMEOUT))

		{

		}

	}

	else

	{

	// switch to windowed so the message box is visible, unless we already

	// tried that and failed

		if (!in_sys_error0)

		{

			in_sys_error0 = 1;

			VID_SetDefaultMode ();

			MessageBox(NULL, text, "Quake Error",

					   MB_OK | MB_SETFOREGROUND | MB_ICONSTOP);

		}

		else

		{

			MessageBox(NULL, text, "Double Quake Error",

					   MB_OK | MB_SETFOREGROUND | MB_ICONSTOP);

		}

	}

	if (!in_sys_error1)

	{

		in_sys_error1 = 1;

		Host_Shutdown ();

	}

// shut down QHOST hooks if necessary

	if (!in_sys_error2)

	{

		in_sys_error2 = 1;

		DeinitConProc ();

	}

	exit (1);

}

void Sys_Printf (char *fmt, ...)

{

	va_list		argptr;

	char		text[1024];

	DWORD		dummy;

	if (isDedicated)

	{

		va_start (argptr,fmt);

		vsprintf (text, fmt, argptr);

		va_end (argptr);

		WriteFile(houtput, text, strlen (text), &dummy, NULL);

	}

}

void Sys_Quit (void)

{

	VID_ForceUnlockedAndReturnState ();

	Host_Shutdown();

	if (tevent)

		CloseHandle (tevent);

	if (isDedicated)

		FreeConsole ();

// shut down QHOST hooks if necessary

	DeinitConProc ();

	exit (0);

}

/*

================

Sys_FloatTime

================

*/

double Sys_FloatTime (void)

{

	static int			sametimecount;

	static unsigned int	oldtime;

	static int			first = 1;

	LARGE_INTEGER		PerformanceCount;

	unsigned int		temp, t2;

	double				time;

	Sys_PushFPCW_SetHigh ();

	QueryPerformanceCounter (&PerformanceCount);

	temp = ((unsigned int)PerformanceCount.LowPart >> lowshift) |

		   ((unsigned int)PerformanceCount.HighPart << (32 - lowshift));

	if (first)

	{

		oldtime = temp;

		first = 0;

	}

	else

	{

	// check for turnover or backward time

		if ((temp <= oldtime) && ((oldtime - temp) < 0x10000000))

		{

			oldtime = temp;	// so we can't get stuck

		}

		else

		{

			t2 = temp - oldtime;

			time = (double)t2 * pfreq;

			oldtime = temp;

			curtime += time;

			if (curtime == lastcurtime)

			{

				sametimecount++;

				if (sametimecount > 100000)

				{

					curtime += 1.0;

					sametimecount = 0;

				}

			}

			else

			{

				sametimecount = 0;

			}

			lastcurtime = curtime;

		}

	}

	Sys_PopFPCW ();

    return curtime;

}

/*

================

Sys_InitFloatTime

================

*/

void Sys_InitFloatTime (void)

{

	int		j;

	Sys_FloatTime ();

	j = COM_CheckParm("-starttime");

	if (j)

	{

		curtime = (double) (Q_atof(com_argv[j+1]));

	}

	else

	{

		curtime = 0.0;

	}

	lastcurtime = curtime;

}

char *Sys_ConsoleInput (void)

{

	static char	text[256];

	static int		len;

	INPUT_RECORD	recs[1024];

	int		count;

	int		i, dummy;

	int		ch, numread, numevents;

	if (!isDedicated)

		return NULL;

	for ( ;; )

	{

		if (!GetNumberOfConsoleInputEvents (hinput, &numevents))

			Sys_Error ("Error getting # of console events");

		if (numevents <= 0)

			break;

		if (!ReadConsoleInput(hinput, recs, 1, &numread))

			Sys_Error ("Error reading console input");

		if (numread != 1)

			Sys_Error ("Couldn't read console input");

		if (recs[0].EventType == KEY_EVENT)

		{

			if (!recs[0].Event.KeyEvent.bKeyDown)

			{

				ch = recs[0].Event.KeyEvent.uChar.AsciiChar;

				switch (ch)

				{

					case '\r':

						WriteFile(houtput, "\r\n", 2, &dummy, NULL);

						if (len)

						{

							text[len] = 0;

							len = 0;

							return text;

						}

						else if (sc_return_on_enter)

						{

						// special case to allow exiting from the error handler on Enter

							text[0] = '\r';

							len = 0;

							return text;

						}

						break;

					case '\b':

						WriteFile(houtput, "\b \b", 3, &dummy, NULL);

						if (len)

						{

							len--;

						}

						break;

					default:

						if (ch >= ' ')

						{

							WriteFile(houtput, &ch, 1, &dummy, NULL);

							text[len] = ch;

							len = (len + 1) & 0xff;

						}

						break;

				}

			}

		}

	}

	return NULL;

}

void Sys_Sleep (void)

{

	Sleep (1);

}

void Sys_SendKeyEvents (void)

{

    MSG        msg;

	while (PeekMessage (&msg, NULL, 0, 0, PM_NOREMOVE))

	{

	// we always update if there are any event, even if we're paused

		scr_skipupdate = 0;

		if (!GetMessage (&msg, NULL, 0, 0))

			Sys_Quit ();

      	TranslateMessage (&msg);

      	DispatchMessage (&msg);

	}

}

/*

==============================================================================

 WINDOWS CRAP

==============================================================================

*/

/*

==================

WinMain

==================

*/

void SleepUntilInput (int time)

{

	MsgWaitForMultipleObjects(1, &tevent, FALSE, time, QS_ALLINPUT);

}

/*

==================

WinMain

==================

*/

HINSTANCE	global_hInstance;

int			global_nCmdShow;

char		*argv[MAX_NUM_ARGVS];

static char	*empty_string = "";

HWND		hwnd_dialog;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)

{

    MSG				msg;

	quakeparms_t	parms;

	double			time, oldtime, newtime;

	MEMORYSTATUS	lpBuffer;

	static	char	cwd[1024];

	int				t;

	RECT			rect;

    /* previous instances do not exist in Win32 */

    if (hPrevInstance)

        return 0;

	global_hInstance = hInstance;

	global_nCmdShow = nCmdShow;

	lpBuffer.dwLength = sizeof(MEMORYSTATUS);

	GlobalMemoryStatus (&lpBuffer);

	if (!GetCurrentDirectory (sizeof(cwd), cwd))

		Sys_Error ("Couldn't determine current directory");

	if (cwd[Q_strlen(cwd)-1] == '/')

		cwd[Q_strlen(cwd)-1] = 0;

	parms.basedir = cwd;

	parms.cachedir = NULL;

	parms.argc = 1;

	argv[0] = empty_string;

	while (*lpCmdLine && (parms.argc < MAX_NUM_ARGVS))

	{

		while (*lpCmdLine && ((*lpCmdLine <= 32) || (*lpCmdLine > 126)))

			lpCmdLine++;

		if (*lpCmdLine)

		{

			argv[parms.argc] = lpCmdLine;

			parms.argc++;

			while (*lpCmdLine && ((*lpCmdLine > 32) && (*lpCmdLine <= 126)))

				lpCmdLine++;

			if (*lpCmdLine)

			{

				*lpCmdLine = 0;

				lpCmdLine++;

			}

		}

	}

	parms.argv = argv;

	COM_InitArgv (parms.argc, parms.argv);

	parms.argc = com_argc;

	parms.argv = com_argv;

	isDedicated = (COM_CheckParm ("-dedicated") != 0);

	if (!isDedicated)

	{

		hwnd_dialog = CreateDialog(hInstance, MAKEINTRESOURCE(IDD_DIALOG1), NULL, NULL);

		if (hwnd_dialog)

		{

			if (GetWindowRect (hwnd_dialog, &rect))

			{

				if (rect.left > (rect.top * 2))

				{

					SetWindowPos (hwnd_dialog, 0,

						(rect.left / 2) - ((rect.right - rect.left) / 2),

						rect.top, 0, 0,

						SWP_NOZORDER | SWP_NOSIZE);

				}

			}

			ShowWindow (hwnd_dialog, SW_SHOWDEFAULT);

			UpdateWindow (hwnd_dialog);

			SetForegroundWindow (hwnd_dialog);

		}

	}

// take the greater of all the available memory or half the total memory,

// but at least 8 Mb and no more than 16 Mb, unless they explicitly

// request otherwise

	parms.memsize = lpBuffer.dwAvailPhys;

	if (parms.memsize < MINIMUM_WIN_MEMORY)

		parms.memsize = MINIMUM_WIN_MEMORY;

	if (parms.memsize < (lpBuffer.dwTotalPhys >> 1))

		parms.memsize = lpBuffer.dwTotalPhys >> 1;

	if (parms.memsize > MAXIMUM_WIN_MEMORY)

		parms.memsize = MAXIMUM_WIN_MEMORY;

	if (COM_CheckParm ("-heapsize"))

	{

		t = COM_CheckParm("-heapsize") + 1;

		if (t < com_argc)

			parms.memsize = Q_atoi (com_argv[t]) * 1024;

	}

	parms.membase = malloc (parms.memsize);

	if (!parms.membase)

		Sys_Error ("Not enough memory free; check disk space\n");

	Sys_PageIn (parms.membase, parms.memsize);

	tevent = CreateEvent(NULL, FALSE, FALSE, NULL);

	if (!tevent)

		Sys_Error ("Couldn't create event");

	if (isDedicated)

	{

		if (!AllocConsole ())

		{

			Sys_Error ("Couldn't create dedicated server console");

		}

		hinput = GetStdHandle (STD_INPUT_HANDLE);

		houtput = GetStdHandle (STD_OUTPUT_HANDLE);

	// give QHOST a chance to hook into the console

		if ((t = COM_CheckParm ("-HFILE")) > 0)

		{

			if (t < com_argc)

				hFile = (HANDLE)Q_atoi (com_argv[t+1]);

		}

		if ((t = COM_CheckParm ("-HPARENT")) > 0)

		{

			if (t < com_argc)

				heventParent = (HANDLE)Q_atoi (com_argv[t+1]);

		}

		if ((t = COM_CheckParm ("-HCHILD")) > 0)

		{

			if (t < com_argc)

				heventChild = (HANDLE)Q_atoi (com_argv[t+1]);

		}

		InitConProc (hFile, heventParent, heventChild);

	}

	Sys_Init ();

// because sound is off until we become active

	S_BlockSound ();

	Sys_Printf ("Host_Init\n");

	Host_Init (&parms);

	oldtime = Sys_FloatTime ();

    /* main window message loop */

	while (1)

	{

		if (isDedicated)

		{

			newtime = Sys_FloatTime ();

			time = newtime - oldtime;

			while (time < sys_ticrate.value )

			{

				Sys_Sleep();

				newtime = Sys_FloatTime ();

				time = newtime - oldtime;

			}

		}

		else

		{

		// yield the CPU for a little while when paused, minimized, or not the focus

			if ((cl.paused && (!ActiveApp && !DDActive)) || Minimized || block_drawing)

			{

				SleepUntilInput (PAUSE_SLEEP);

				scr_skipupdate = 1;		// no point in bothering to draw

			}

			else if (!ActiveApp && !DDActive)

			{

				SleepUntilInput (NOT_FOCUS_SLEEP);

			}

			newtime = Sys_FloatTime ();

			time = newtime - oldtime;

		}

		Host_Frame (time);

		oldtime = newtime;

	}

    /* return success of application */

    return TRUE;

}