/*	SCCS Id: @(#)nh340key.c	3.4	$Date: 2003/12/11 09:49:08 $   */
/* Copyright (c) NetHack PC Development Team 2003                      */
/* NetHack may be freely redistributed.  See license for details.      */

/*
 * This is the NetHack keystroke processing from NetHack 3.4.0.
 * It can be built as a run-time loadable dll (nh340key.dll),
 * placed in the same directory as the nethack.exe executable,
 * and loaded by specifying OPTIONS=altkeyhandler:nh340key
 * in defaults.nh
 */

static char where_to_get_source[] = "http://www.nethack.org/";
static char author[] = "The NetHack Development Team";

#include "hack.h"
#include "wintty.h"
#include "win32api.h"

extern HANDLE hConIn;
extern INPUT_RECORD ir;
char dllname[512];
char *shortdllname;

int FDECL(__declspec(dllexport) __stdcall
ProcessKeystroke, (HANDLE hConIn, INPUT_RECORD *ir, 
    boolean *valid, BOOLEAN_P numberpad, int portdebug));

int WINAPI DllMain(HINSTANCE hInstance, DWORD fdwReason, PVOID pvReserved)
{
	char dlltmpname[512];
	char *tmp = dlltmpname, *tmp2;
	*(tmp + GetModuleFileName(hInstance, tmp, 511)) = '\0';
	(void)strcpy(dllname, tmp);
	tmp2 = strrchr(dllname, '\\');
	if (tmp2) {
		tmp2++;
		shortdllname = tmp2;
	}
	return TRUE;
}

/*
 *  Keyboard translation tables.
 *  (Adopted from the MSDOS port)
 */

#define KEYPADLO	0x47
#define KEYPADHI	0x53

#define PADKEYS 	(KEYPADHI - KEYPADLO + 1)
#define iskeypad(x)	(KEYPADLO <= (x) && (x) <= KEYPADHI)

/*
 * Keypad keys are translated to the normal values below.
 * Shifted keypad keys are translated to the
 *    shift values below.
 */

static const struct pad {
	uchar normal, shift, cntrl;
} keypad[PADKEYS] = {
			{'y', 'Y', C('y')},		/* 7 */
			{'k', 'K', C('k')},		/* 8 */
			{'u', 'U', C('u')},		/* 9 */
			{'m', C('p'), C('p')},		/* - */
			{'h', 'H', C('h')},		/* 4 */
			{'g', 'G', 'g'},		/* 5 */
			{'l', 'L', C('l')},		/* 6 */
			{'+', 'P', C('p')},		/* + */
			{'b', 'B', C('b')},		/* 1 */
			{'j', 'J', C('j')},		/* 2 */
			{'n', 'N', C('n')},		/* 3 */
			{'i', 'I', C('i')},		/* Ins */
			{'.', ':', ':'}			/* Del */
}, numpad[PADKEYS] = {
			{'7', M('7'), '7'},		/* 7 */
			{'8', M('8'), '8'},		/* 8 */
			{'9', M('9'), '9'},		/* 9 */
			{'m', C('p'), C('p')},		/* - */
			{'4', M('4'), '4'},		/* 4 */
			{'g', 'G', 'g'},		/* 5 */
			{'6', M('6'), '6'},		/* 6 */
			{'+', 'P', C('p')},		/* + */
			{'1', M('1'), '1'},		/* 1 */
			{'2', M('2'), '2'},		/* 2 */
			{'3', M('3'), '3'},		/* 3 */
			{'i', 'I', C('i')},		/* Ins */
			{'.', ':', ':'}			/* Del */
};

#define inmap(x,vk)	(((x) > 'A' && (x) < 'Z') || (vk) == 0xBF || (x) == '2')

int __declspec(dllexport) __stdcall
ProcessKeystroke(hConIn, ir, valid, numberpad, portdebug)
HANDLE hConIn;
INPUT_RECORD *ir;
boolean *valid;
boolean numberpad;
int portdebug;
{
	int metaflags = 0, k = 0;
	int keycode, vk;
	unsigned char ch, pre_ch, mk = 0;
	unsigned short int scan;
	unsigned long shiftstate;
	int altseq = 0;
	const struct pad *kpad;

	shiftstate = 0L;
	ch = pre_ch = ir->Event.KeyEvent.uChar.AsciiChar;
	scan  = ir->Event.KeyEvent.wVirtualScanCode;
	vk    = ir->Event.KeyEvent.wVirtualKeyCode;
	keycode = MapVirtualKey(vk, 2);
	shiftstate = ir->Event.KeyEvent.dwControlKeyState;

	if (shiftstate & (LEFT_ALT_PRESSED|RIGHT_ALT_PRESSED)) {
		if (ch || inmap(keycode,vk)) altseq = 1;
		else altseq = -1;	/* invalid altseq */
	}
	if (ch || (iskeypad(scan)) || (altseq > 0))
		*valid = TRUE;
	/* if (!valid) return 0; */
    	/*
	 * shiftstate can be checked to see if various special
         * keys were pressed at the same time as the key.
         * Currently we are using the ALT & SHIFT & CONTROLS.
         *
         *           RIGHT_ALT_PRESSED, LEFT_ALT_PRESSED,
         *           RIGHT_CTRL_PRESSED, LEFT_CTRL_PRESSED,
         *           SHIFT_PRESSED,NUMLOCK_ON, SCROLLLOCK_ON,
         *           CAPSLOCK_ON, ENHANCED_KEY
         *
         * are all valid bit masks to use on shiftstate.
         * eg. (shiftstate & LEFT_CTRL_PRESSED) is true if the
         *      left control key was pressed with the keystroke.
         */
        if (iskeypad(scan)) {
            kpad = numberpad ? numpad : keypad;
            if (shiftstate & SHIFT_PRESSED) {
                ch = kpad[scan - KEYPADLO].shift;
            }
            else if (shiftstate & (LEFT_CTRL_PRESSED | RIGHT_CTRL_PRESSED)) {
                ch = kpad[scan - KEYPADLO].cntrl;
            }
            else {
                ch = kpad[scan - KEYPADLO].normal;
            }
        }
        else if (altseq > 0) { /* ALT sequence */
		if (vk == 0xBF) ch = M('?');
		else ch = M(tolower(keycode));
        }
	if (ch == '\r') ch = '\n';
#ifdef PORT_DEBUG
	if (portdebug) {
		char buf[BUFSZ];
		Sprintf(buf,
	"PORTDEBUG (%s): ch=%u, sc=%u, vk=%d, sh=0x%X (ESC to end)",
			shortdllname, ch, scan, vk, shiftstate);
		fprintf(stdout, "\n%s", buf);
	}
#endif
	return ch;
}

int __declspec(dllexport) __stdcall
NHkbhit(hConIn, ir)
HANDLE hConIn;
INPUT_RECORD *ir;
{
	int done = 0;	/* true =  "stop searching"        */
	int retval;	/* true =  "we had a match"        */
	DWORD count;
	unsigned short int scan;
	unsigned char ch;
	unsigned long shiftstate;
	int altseq = 0, keycode, vk;
	done = 0;
	retval = 0;
	while (!done)
	{
	    count = 0;
	    PeekConsoleInput(hConIn,ir,1,&count);
	    if (count > 0) {
		if (ir->EventType == KEY_EVENT && ir->Event.KeyEvent.bKeyDown) {
			ch    = ir->Event.KeyEvent.uChar.AsciiChar;
			scan  = ir->Event.KeyEvent.wVirtualScanCode;
			shiftstate = ir->Event.KeyEvent.dwControlKeyState;
			vk = ir->Event.KeyEvent.wVirtualKeyCode;
			keycode = MapVirtualKey(vk, 2);
			if (shiftstate & (LEFT_ALT_PRESSED|RIGHT_ALT_PRESSED)) {
				if  (ch || inmap(keycode,vk)) altseq = 1;
				else altseq = -1;	/* invalid altseq */
			}
			if (ch || iskeypad(scan) || altseq) {
				done = 1;	    /* Stop looking         */
				retval = 1;         /* Found what we sought */
			} else {
				/* Strange Key event; let's purge it to avoid trouble */
				ReadConsoleInput(hConIn,ir,1,&count);
			}

		}
		else if ((ir->EventType == MOUSE_EVENT &&
		  (ir->Event.MouseEvent.dwButtonState & MOUSEMASK))) {
			done = 1;
			retval = 1;
		}

		else /* Discard it, it's an insignificant event */
			ReadConsoleInput(hConIn,ir,1,&count);
		} else  /* There are no events in console event queue */ {
		done = 1;	  /* Stop looking               */
		retval = 0;
	    }
	}
	return retval;
}

int __declspec(dllexport) __stdcall
CheckInput(hConIn, ir, count, numpad, mode, mod, cc)
HANDLE hConIn;
INPUT_RECORD *ir;
DWORD *count; 
boolean numpad;
int mode;
int *mod;
coord *cc;
{
	int ch;
	boolean valid = 0, done = 0;
	while (!done) {
		ReadConsoleInput(hConIn,ir,1,count);
		if (mode == 0) {
		    if ((ir->EventType == KEY_EVENT) && ir->Event.KeyEvent.bKeyDown) {
			ch = ProcessKeystroke(hConIn, ir, &valid, numpad, 0);
			done = valid;
		    }
		} else {
		    if (count > 0) {
			if (ir->EventType == KEY_EVENT && ir->Event.KeyEvent.bKeyDown) {
			    ch = ProcessKeystroke(hConIn, ir, &valid, numpad, 0);
			    if (valid) return ch;
			} else if (ir->EventType == MOUSE_EVENT) {
			    if ((ir->Event.MouseEvent.dwEventFlags == 0) &&
		   	        (ir->Event.MouseEvent.dwButtonState & MOUSEMASK)) {
			  	    cc->x = ir->Event.MouseEvent.dwMousePosition.X + 1;
			  	    cc->y = ir->Event.MouseEvent.dwMousePosition.Y - 1;

				    if (ir->Event.MouseEvent.dwButtonState & LEFTBUTTON)
		  	       		*mod = CLICK_1;
				    else if (ir->Event.MouseEvent.dwButtonState & RIGHTBUTTON)
					*mod = CLICK_2;
#if 0	/* middle button */
				    else if (ir->Event.MouseEvent.dwButtonState & MIDBUTTON)
			      		*mod = CLICK_3;
#endif 
			           return 0;
			    }
	        	}
		    } else 
			done = 1;
		}
	}
	return mode ? 0 : ch;
}

int __declspec(dllexport) __stdcall
SourceWhere(buf)
char **buf;
{
	if (!buf) return 0;
	*buf = where_to_get_source;
	return 1;
}

int __declspec(dllexport) __stdcall
SourceAuthor(buf)
char **buf;
{
	if (!buf) return 0;
	*buf = author;
	return 1;
}

int __declspec(dllexport) __stdcall
KeyHandlerName(buf, full)
char **buf;
int full;
{
	if (!buf) return 0;
	if (full) *buf = dllname;
	else *buf = shortdllname;
	return 1;
}

