/*
Copyright (C) 1997-2001 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.
*/

#define KEYBINDINGS_HARDCODED
//#define PRINT_HARDCODING_TABLES
//#define MAX_HARDCODED_KEYS 118 // also in x11_hardcoded.h

#include "x11.h"
#include "../client/client.h"
#ifdef KEYBINDINGS_HARDCODED
#include "x11_hardcoded.h"
#endif

// TODO: add in_mouse?
static cvar_t *in_dgamouse;

cvar_t *in_grabinconsole;

static qboolean input_inited = qfalse;
static qboolean mouse_active = qfalse;
static qboolean input_active = qfalse;
static qboolean dgamouse = qfalse;

static int mx, my;

static qboolean ignore_one = qfalse;

static Time myxtime;

static Cursor CreateNullCursor (Display *display, Window root)
{
	Pixmap cursormask; 
	XGCValues xgc;
	GC gc;
	XColor dummycolour;
	Cursor cursor;

	cursormask = XCreatePixmap(display, root, 1, 1, 1/*depth*/);
	xgc.function = GXclear;
	gc = XCreateGC(display, cursormask, GCFunction, &xgc);
	XFillRectangle(display, cursormask, gc, 0, 0, 1, 1);

	dummycolour.pixel = 0;
	dummycolour.red = 0;
	dummycolour.flags = 04;

	cursor = XCreatePixmapCursor(display, cursormask, cursormask, &dummycolour, &dummycolour, 0, 0);
	XFreePixmap(display, cursormask);
	XFreeGC(display, gc);

	return cursor;
}


static void install_grabs (void)
{
	assert(x11display.dpy && x11display.win);

	XDefineCursor (x11display.dpy, x11display.win, CreateNullCursor(x11display.dpy, x11display.win));
	XGrabPointer (x11display.dpy, x11display.win, True, 0, GrabModeAsync, GrabModeAsync, x11display.win, None, CurrentTime);

	if (in_dgamouse->integer)
	{
		int MajorVersion, MinorVersion;

		if (XF86DGAQueryVersion (x11display.dpy, &MajorVersion, &MinorVersion)) 
		{ 
			XF86DGADirectVideo (x11display.dpy, x11display.scr, XF86DGADirectMouse);
			XWarpPointer (x11display.dpy, None, x11display.win, 0, 0, 0, 0, 0, 0);
			dgamouse = qtrue;

		} else
		{
			// unable to query, probalby not supported
			Com_Printf( "Failed to detect XF86DGA Mouse\n" );
			Cvar_Set( "in_dgamouse", "0" );
			dgamouse = qfalse;
		}
	} else {
		XWarpPointer (x11display.dpy, None, x11display.win, 0, 0, 0, 0,
			x11display.win_width/2, x11display.win_height/2);
	}

	ignore_one = qtrue; // first mouse update after install_grabs is ignored
	mx = my = 0;
	mouse_active = qtrue;

	in_dgamouse->modified = qfalse;

	XGrabKeyboard (x11display.dpy, x11display.win, False, GrabModeAsync, GrabModeAsync, CurrentTime);

	input_active = qtrue;
}

static void uninstall_grabs (void)
{
	assert(x11display.dpy && x11display.win);

	if (mouse_active)
	{
		if (dgamouse)
		{
			dgamouse = qfalse;
			XF86DGADirectVideo (x11display.dpy, x11display.scr, 0);
		}

		XUngrabPointer (x11display.dpy, CurrentTime);
		XUndefineCursor (x11display.dpy, x11display.win); // inviso cursor

		mouse_active = qfalse;
		mx = my = 0;
	}

	XUngrabKeyboard (x11display.dpy, CurrentTime);

	input_active = qfalse;
}

#ifdef PRINT_HARDCODING_TABLES

static char *KeysymToKey(KeySym keysym)
{
	char *buf;

	switch (keysym)
	{
	case XK_KP_Page_Up:
	case XK_KP_9:  return "KP_PGUP";
	case XK_Page_Up:   return "K_PGUP";

	case XK_KP_Page_Down:
	case XK_KP_3: return "KP_PGDN";
	case XK_Page_Down:   return "K_PGDN";

	case XK_KP_Home: return "KP_HOME";
	case XK_KP_7: return "KP_HOME";
	case XK_Home:  return "K_HOME";

	case XK_KP_End:
	case XK_KP_1:   return "KP_END";
	case XK_End:   return "K_END";

	case XK_KP_Left: return "KP_LEFTARROW";
	case XK_KP_4: return "KP_LEFTARROW";
	case XK_Left:  return "K_LEFTARROW";

	case XK_KP_Right: return "KP_RIGHTARROW";
	case XK_KP_6: return "KP_RIGHTARROW";
	case XK_Right:  return "K_RIGHTARROW";

	case XK_KP_Down:
	case XK_KP_2:    return "KP_DOWNARROW";
	case XK_Down:  return "K_DOWNARROW";

	case XK_KP_Up:
	case XK_KP_8:    return "KP_UPARROW";
	case XK_Up:    return "K_UPARROW";

	case XK_Escape: return "K_ESCAPE";

	case XK_KP_Enter: return "KP_ENTER";
	case XK_Return: return "K_ENTER";

	case XK_Tab:    return "K_TAB";

	case XK_F1:    return "K_F1";
	case XK_F2:    return "K_F2";
	case XK_F3:    return "K_F3";
	case XK_F4:    return "K_F4";
	case XK_F5:    return "K_F5";
	case XK_F6:    return "K_F6";
	case XK_F7:    return "K_F7";
	case XK_F8:    return "K_F8";
	case XK_F9:    return "K_F9";
	case XK_F10:    return "K_F10";
	case XK_F11:    return "K_F11";
	case XK_F12:    return "K_F12";

		// bk001206 - from Ryan's Fakk2
		//case XK_BackSpace: return 8; // ctrl-h
	case XK_BackSpace: return "K_BACKSPACE";

	case XK_KP_Delete:
	case XK_KP_Decimal: return "KP_DEL";
	case XK_Delete: return "K_DEL";

	case XK_Pause:  return "K_PAUSE";

	case XK_Shift_L:
	case XK_Shift_R:  return "K_SHIFT";

	case XK_Execute:
	case XK_Control_L:
	case XK_Control_R:  return "K_CTRL";

	case XK_Alt_L:
	case XK_Meta_L:
	case XK_Alt_R:
	case XK_Meta_R: return "K_ALT";

	case XK_KP_Begin: return "KP_5";

	case XK_Insert:   return "K_INS";
	case XK_KP_Insert:
	case XK_KP_0: return "KP_INS";

	case XK_KP_Multiply: return "KP_STAR";
	case XK_KP_Add:  return "KP_PLUS";
	case XK_KP_Subtract: return "KP_MINUS";
	case XK_KP_Divide: return "KP_SLASH";

		// bk001130 - from cvs1.17 (mkv)
	case XK_exclam: return va("%i", '1');
	case XK_at: return va("%i", '2');
	case XK_numbersign: return va("%i", '3');
	case XK_dollar: return va("%i", '4');
	case XK_percent: return va("%i", '5');
	case XK_asciicircum: return va("%i", '6');
	case XK_ampersand: return va("%i", '7');
	case XK_asterisk: return va("%i", '8');
	case XK_parenleft: return va("%i", '9');
	case XK_parenright: return va("%i", '0');
		// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=472
	case XK_space:
	case XK_KP_Space: return "K_SPACE";

	// wsw : mdr
	case XK_Caps_Lock: return "K_CAPSLOCK";
	case XK_Num_Lock: return "K_NUMLOCK";
	case XK_Scroll_Lock: return "K_SCROLLLOCK";
	}

	buf = XKeysymToString(keysym);
	if (buf != NULL) {
		int key = *(unsigned char *)buf;
		if (strlen(buf) == 1 && (key >= 9 && key <= 127))
			return va("%i", key);
	}

	if( keysym >= 9 && keysym < 127 )
		return va("%i", (int)keysym);

	return "-1"; // no luck
}

static void PrintKeycodeToKeysymToKeyTable(void)
{
	int i;
	KeySym keysym;
	char *key;

	printf("#define MAX_HARDCODED_KEYS %i\n", MAX_HARDCODED_KEYS);
	printf("\n");
	printf("int keycode_to_keysym_key[MAX_HARDCODED_KEYS][2] = {\n");

	for( i = 0; i < MAX_HARDCODED_KEYS; i++ ) {
		keysym = XKeycodeToKeysym(x11display.dpy, i, 0);
		key = KeysymToKey(keysym);
		printf("\t{ %i, %s },\n", (int)keysym, key);
	}

	printf("};\n");
}

#endif // PRINT_HARDCODING_TABLES

#ifdef KEYBINDINGS_HARDCODED

// Q3 version
static char *XLateKey(XKeyEvent *ev, int *key)
{
	static char buf[64];

#ifdef PRINT_HARDCODING_TABLES
	static qboolean done = qfalse;
	if( !done ) {
		PrintKeycodeToKeysymToKeyTable();
		done = qtrue;
	}
#endif

	// binds come from hardcoded US keymap
	if( ev->keycode < MAX_HARDCODED_KEYS )
		*key = keycode_to_keysym_key[ev->keycode][1];
	else
		*key = -1; // can't handle it

	// char events use the real layout
	XLookupString(ev, buf, sizeof(buf), NULL, 0);

	return buf;
}

#else // KEYBINDINGS_HARDCODED

// Q3 version
static char *XLateKey(XKeyEvent *ev, int *key)
{
	static char buf[64];
	KeySym keysym;
	int XLookupRet;

#ifdef PRINT_HARDCODING_TABLES
	static qboolean done = qfalse;
	if( !done ) {
		PrintKeycodeToKeysymToKeyTable();
		done = qtrue;
	}
#endif

	*key = 0;

	XLookupRet = XLookupString(ev, buf, sizeof buf, &keysym, 0);
#ifdef KBD_DBG
	ri.Printf("XLookupString ret: %d buf: %s keysym: %x\n", XLookupRet, buf, keysym);
#endif

	switch (keysym)
	{
	case XK_KP_Page_Up:
	case XK_KP_9:  *key = KP_PGUP; break;
	case XK_Page_Up:   *key = K_PGUP; break;

	case XK_KP_Page_Down:
	case XK_KP_3: *key = KP_PGDN; break;
	case XK_Page_Down:   *key = K_PGDN; break;

	case XK_KP_Home: *key = KP_HOME; break;
	case XK_KP_7: *key = KP_HOME; break;
	case XK_Home:  *key = K_HOME; break;

	case XK_KP_End:
	case XK_KP_1:   *key = KP_END; break;
	case XK_End:   *key = K_END; break;

	case XK_KP_Left: *key = KP_LEFTARROW; break;
	case XK_KP_4: *key = KP_LEFTARROW; break;
	case XK_Left:  *key = K_LEFTARROW; break;

	case XK_KP_Right: *key = KP_RIGHTARROW; break;
	case XK_KP_6: *key = KP_RIGHTARROW; break;
	case XK_Right:  *key = K_RIGHTARROW;    break;

	case XK_KP_Down:
	case XK_KP_2:    *key = KP_DOWNARROW; break;
	case XK_Down:  *key = K_DOWNARROW; break;

	case XK_KP_Up:   
	case XK_KP_8:    *key = KP_UPARROW; break;
	case XK_Up:    *key = K_UPARROW;   break;

	case XK_Escape: *key = K_ESCAPE;    break;

	case XK_KP_Enter: *key = KP_ENTER;  break;
	case XK_Return: *key = K_ENTER;    break;

	case XK_Tab:    *key = K_TAB;      break;

	case XK_F1:    *key = K_F1;       break;

	case XK_F2:    *key = K_F2;       break;

	case XK_F3:    *key = K_F3;       break;

	case XK_F4:    *key = K_F4;       break;

	case XK_F5:    *key = K_F5;       break;

	case XK_F6:    *key = K_F6;       break;

	case XK_F7:    *key = K_F7;       break;

	case XK_F8:    *key = K_F8;       break;

	case XK_F9:    *key = K_F9;       break;

	case XK_F10:    *key = K_F10;      break;

	case XK_F11:    *key = K_F11;      break;

	case XK_F12:    *key = K_F12;      break;

		// bk001206 - from Ryan's Fakk2 
		//case XK_BackSpace: *key = 8; break; // ctrl-h
	case XK_BackSpace: *key = K_BACKSPACE; break; // ctrl-h

	case XK_KP_Delete:
	case XK_KP_Decimal: *key = KP_DEL; break;
	case XK_Delete: *key = K_DEL; break;

	case XK_Pause:  *key = K_PAUSE;    break;

	case XK_Shift_L:
	case XK_Shift_R:  *key = K_SHIFT;   break;

	case XK_Execute: 
	case XK_Control_L: 
	case XK_Control_R:  *key = K_CTRL;  break;

	case XK_Alt_L:  
	case XK_Meta_L: 
	case XK_Alt_R:  
	case XK_Meta_R: *key = K_ALT;     break;

	case XK_KP_Begin: *key = KP_5;  break;

	case XK_Insert:   *key = K_INS; break;
	case XK_KP_Insert:
	case XK_KP_0: *key = KP_INS; break;

	case XK_KP_Multiply: *key = KP_STAR; break;
	case XK_KP_Add:  *key = KP_PLUS; break;
	case XK_KP_Subtract: *key = KP_MINUS; break;
	case XK_KP_Divide: *key = KP_SLASH; break;

		// bk001130 - from cvs1.17 (mkv)
	case XK_exclam: *key = '1'; break;
	case XK_at: *key = '2'; break;
	case XK_numbersign: *key = '3'; break;
	case XK_dollar: *key = '4'; break;
	case XK_percent: *key = '5'; break;
	case XK_asciicircum: *key = '6'; break;
	case XK_ampersand: *key = '7'; break;
	case XK_asterisk: *key = '8'; break;
	case XK_parenleft: *key = '9'; break;
	case XK_parenright: *key = '0'; break;

		// weird french keyboards ..
		// NOTE: console toggle is hardcoded in cl_keys.c, can't be unbound
		//   cleaner would be .. using hardware key codes instead of the key syms
		//   could also add a new K_KP_CONSOLE
	case XK_twosuperior: *key = '~'; break;

		// https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=472
	case XK_space:
	case XK_KP_Space: *key = K_SPACE; break;

	// wsw : mdr
	case XK_Caps_Lock: *key = K_CAPSLOCK; break;
	case XK_Num_Lock: *key = K_NUMLOCK; break;
	case XK_Scroll_Lock: *key = K_SCROLLLOCK; break;

	default:
		if (XLookupRet == 0)
		{
			/*
			if (com_developer->value)
			{
				ri.Printf(PRINT_ALL, "Warning: XLookupString failed on KeySym %d\n", keysym);
			}
			*/
			return NULL;
		}
		else
		{
			// XK_* tests failed, but XLookupString got a buffer, so let's try it
			*key = *(unsigned char *)buf;
			if (*key >= 'A' && *key <= 'Z')
				*key = *key - 'A' + 'a';
			// if ctrl is pressed, the keys are not between 'A' and 'Z', for instance ctrl-z == 26 ^Z ^C etc.
			// see https://zerowing.idsoftware.com/bugzilla/show_bug.cgi?id=19
			else if (*key >= 1 && *key <= 26)
				*key = *key + 'a' - 1;
		}
		break;
	} 

	return buf;
}

#endif // KEYBINDINGS_HARDCODED

/**
 * XPending() actually performs a blocking read if no events available. From Fakk2, by way of
 * Heretic2, by way of SDL, original idea GGI project. The benefit of this approach over the quite
 * badly behaved XAutoRepeatOn/Off is that you get focus handling for free, which is a major win
 * with debug and windowed mode. It rests on the assumption that the X server will use the same
 * timestamp on press/release event pairs for key repeats.
 */
static qboolean X11_PendingInput(void)
{
	assert(x11display.dpy);

	// Flush the display connection and look to see if events are queued
	XFlush(x11display.dpy);
	if (XEventsQueued(x11display.dpy, QueuedAlready))
		return qtrue;

	{ // More drastic measures are required -- see if X is ready to talk
		static struct timeval zero_time;
		int x11_fd;
		fd_set fdset;

		x11_fd = ConnectionNumber( x11display.dpy );
		FD_ZERO(&fdset);
		FD_SET(x11_fd, &fdset);
		if (select(x11_fd+1, &fdset, NULL, NULL, &zero_time) == 1)
			return(XPending(x11display.dpy));
	}

	// Oh well, nothing is ready ..
	return qfalse;
}

static qboolean repeated_press(XEvent *event)
{
	XEvent peekevent;
	qboolean repeated = qfalse;

	assert(x11display.dpy);

	if (X11_PendingInput())
	{
		XPeekEvent(x11display.dpy, &peekevent);

		if ((peekevent.type == KeyPress) &&
		    (peekevent.xkey.keycode == event->xkey.keycode) &&
		    (peekevent.xkey.time == event->xkey.time))
		{
			repeated = qtrue;
			// we only skip the KeyRelease event, so we send many key down events, but no releases, while repeating
			//XNextEvent(x11display.dpy, &peekevent);  // skip event.
		}
	}

	return repeated;
}

static void HandleEvents(void)
{
	XEvent event;
	qboolean dowarp = qfalse;
	int mwx = x11display.win_width / 2;
	int mwy = x11display.win_height / 2;
	unsigned char *p;
	int key = 0;
	unsigned int time = Sys_Milliseconds();

	assert(x11display.dpy && x11display.win);

	while (XPending(x11display.dpy))
	{
		XNextEvent (x11display.dpy, &event);

		switch (event.type) 
		{
			case KeyPress:
				myxtime = event.xkey.time;
				p = (unsigned char *)XLateKey(&event.xkey, &key);
				if (key >= 0 && key <= 256)
					Key_Event(key, qtrue, time);
				if (p)
				{
					while (*p)
						Key_CharEvent(*p++);
				}
				break;

			case KeyRelease:
				if (repeated_press(&event))
					break; // don't send release events when repeating
				XLateKey(&event.xkey, &key);
				Key_Event(key, event.type == KeyPress, time);
				break;

			case MotionNotify: // FIXME
				if (mouse_active)
				{
					if (dgamouse)
					{
						mx += event.xmotion.x_root * 2;
						my += event.xmotion.y_root * 2;
					}
					else
					{
						mx += ((int)event.xmotion.x - mwx);
						my += ((int)event.xmotion.y - mwy);

						if (mx || my)
							dowarp = qtrue;
					}
				}
				break;

			case ButtonPress:
				myxtime = event.xbutton.time;
				if (event.xbutton.button == 1) Key_Event(K_MOUSE1, 1, time);
				else if (event.xbutton.button == 2) Key_Event(K_MOUSE3, 1, time);
				else if (event.xbutton.button == 3) Key_Event(K_MOUSE2, 1, time);
				else if (event.xbutton.button == 4) Key_Event(K_MWHEELUP, 1, time);
				else if (event.xbutton.button == 5) Key_Event(K_MWHEELDOWN, 1, time);
				else if (event.xbutton.button >= 6 && event.xbutton.button <= 10) Key_Event(K_MOUSE4+event.xbutton.button-6, 1, time);
				break;

			case ButtonRelease:
				if (event.xbutton.button == 1) Key_Event(K_MOUSE1, 0, time);
				else if (event.xbutton.button == 2) Key_Event(K_MOUSE3, 0, time);
				else if (event.xbutton.button == 3) Key_Event(K_MOUSE2, 0, time);
				else if (event.xbutton.button == 4) Key_Event(K_MWHEELUP, 0, time);
				else if (event.xbutton.button == 5) Key_Event(K_MWHEELDOWN, 0, time);
				else if (event.xbutton.button >= 6 && event.xbutton.button <= 10) Key_Event(K_MOUSE4+event.xbutton.button-6, 0, time);
				break;

			case ClientMessage:
				if (event.xclient.data.l[0] == x11display.wmDeleteWindow)
					Cbuf_ExecuteText(EXEC_NOW, "quit");
				break;
		}
	}

	if (dowarp)
	{
		XWarpPointer (x11display.dpy, None, x11display.win, 0, 0, 0, 0,
			x11display.win_width/2, x11display.win_height/2);
	}
}

/*****************************************************************************/

void IN_Commands (void)
{
}

void IN_Move (usercmd_t *cmd)
{
	if (mouse_active)
	{
		// wsw : pb : moved mousemove to cl_input (q3 like)
		if (ignore_one) {
			mx = my = 0;
			ignore_one = qfalse;
		}
		CL_MouseMove(cmd, mx, my);
		mx = my = 0;
	}
}

void IN_Activate (qboolean active)
{
	if (!input_inited)
		return;

	assert(x11display.dpy && x11display.win);

	if (active)
		install_grabs();
	else
		uninstall_grabs();
}


void IN_Init(void)
{
	if (input_inited)
		return;

	in_dgamouse = Cvar_Get ("in_dgamouse", "1", CVAR_ARCHIVE);
	in_grabinconsole = Cvar_Get ("in_grabinconsole", "0", CVAR_ARCHIVE);

	install_grabs();
	input_inited = qtrue;
}

void IN_Shutdown (void)
{
	if (!input_inited)
		return;

	uninstall_grabs();
	input_inited = qfalse;
}

void IN_Restart(void)
{
	IN_Shutdown();
	IN_Init();
}

void IN_Frame (void)
{
	if (!input_inited)
		return;

	if ((cls.key_dest == key_console) && !in_grabinconsole->integer && !Cvar_VariableValue("vid_fullscreen")) {
		if (input_active)
			IN_Activate(qfalse);
	} else {
		if (!input_active)
			IN_Activate(qtrue);
	}

	HandleEvents();

	if (input_active && in_dgamouse->modified)
	{
		uninstall_grabs();
		install_grabs();
	}
}