#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include <X11/keysym.h>
#include <X11/Xatom.h>
#include <X11/Xlib.h>
#include <X11/Xutil.h>

#include <GLES/egl.h>
#include <GLES/gl.h>

#include "egl_glimp.h"
#include "../client/client.h"
#include "../renderer/tr_local.h"
#include "../qcommon/q_shared.h"

#define ACCEL_PATH	"/sys/class/i2c-adapter/i2c-3/3-001d/"
#define PROXY_PATH	"/sys/devices/platform/gpio-switch/proximity/"

static int mwx, mwy;
static int mx = 0, my = 0;
static qboolean mouse_active = qfalse;
static qboolean mouse_avail = qfalse;

cvar_t *in_nograb;
static cvar_t *in_mouse;

static cvar_t *accel_angle;
static cvar_t *accel_debug;
static cvar_t *accel_epsilon_x;
/* Cache angle and its sin/cos */
static int accel_angle_value;
static float accel_sin, accel_cos;

static cvar_t *accel_epsilon_y;
static cvar_t *accel_fudge;
static cvar_t *accel_jump;

static int mouse_accel_denominator;
static int mouse_accel_numerator;
static int mouse_threshold;

static int win_x, win_y;

/*****************************************************************************
** KEYBOARD
** NOTE TTimo the keyboard handling is done with KeySyms
**   that means relying on the keyboard mapping provided by X
**   in-game it would probably be better to use KeyCode (i.e. hardware key codes)
**   you would still need the KeySyms in some cases, such as for the console and all entry textboxes
**     (cause there's nothing worse than a qwerty mapping on a french keyboard)
**
** you can turn on some debugging and verbose of the keyboard code with #define KBD_DBG
******************************************************************************/

#define KBD_DBG

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

	*key = 0;

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

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

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

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

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

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

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

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

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

	case XK_Escape:
	case 0x3d:			/* N900: (Fn +) = */
		*key = K_ESCAPE;
		break;

	case XK_KP_Enter:
		*key = K_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 = K_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 = K_KP_5;
		break;

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

	case XK_KP_Multiply:
		*key = '*';
		break;
	case XK_KP_Add:
		*key = K_KP_PLUS;
		break;
	case XK_KP_Subtract:
		*key = K_KP_MINUS;
		break;
	case XK_KP_Divide:
		*key = K_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;

	case XK_twosuperior:
	case 0xff20:			/* N900: Fn + Sym/Ctrl */
		*key = K_CONSOLE;
		*buf = '\0';
		break;

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

static void Proximity_HandleEvents(void)
{
	char buf[16];
	FILE *fp;
	int t;
	static qboolean oldState = qfalse, state = qfalse;

	fp = fopen(PROXY_PATH "/state", "r");
	if (!fp)
		return;
	fgets(buf, sizeof(buf), fp);
	fclose(fp);

	if (Q_stricmp(buf, "closed\n") == 0) {
		state = qtrue;
	} else {
		state = qfalse;
	}

	if (state != oldState) {
		t = Sys_Milliseconds();
		Com_QueueEvent(t, SE_KEY, K_MOUSE1, state, 0, NULL);
		oldState = state;
	}
}

static void Accelerometer_WriteFudge(void)
{
	FILE *fp;

	if (!accel_fudge)
		accel_fudge = Cvar_Get("accel_fudge", "3", CVAR_ARCHIVE);
	if (access(ACCEL_PATH "/fudge", W_OK) < 0)
		return;
	if (!(fp = fopen(ACCEL_PATH "/fudge", "w")))
		return;

	fprintf(fp, "%d\n", accel_fudge->integer);

	fclose(fp);
}

static void Accelerometer_ReadCoords(int *x, int *y, int *z)
{
	char buf[16];
	FILE *fp;
	static qboolean fudge = qfalse;

	if (!fudge) {
		Accelerometer_WriteFudge();
		fudge = qtrue;
	}

	fp = fopen(ACCEL_PATH "/coord", "r");
	if (!fp)
		return;

	fgets(buf, sizeof(buf), fp);
	sscanf(buf, "%d %d %d\n", x, y, z);

	if (accel_debug->integer) {
		Com_DPrintf("Accelerometer_ReadCoords: %d %d %d\n", *x, *y, *z);
	}

	fclose(fp);
}

static void Accelerometer_HandleEvents(void)
{
	int dx = 0, dy = 0;
	int t, tmp;
	int x, y, z;
	static int jumpTime = 0;

	t = Sys_Milliseconds();

	if (!accel_angle) {
		accel_angle = Cvar_Get("accel_angle", "45", CVAR_ARCHIVE);
	}
	if (!accel_debug) {
		accel_debug = Cvar_Get("accel_debug", "0", CVAR_ARCHIVE);
	}
	if (!accel_jump) {
		accel_jump = Cvar_Get("accel_jump", "-1300", CVAR_ARCHIVE);
	}
	if (!accel_epsilon_x) {
		accel_epsilon_x =
		    Cvar_Get("accel_epsilon_x", "100", CVAR_ARCHIVE);
	}
	if (!accel_epsilon_y) {
		accel_epsilon_y =
		    Cvar_Get("accel_epsilon_y", "100", CVAR_ARCHIVE);
	}

	Accelerometer_ReadCoords(&x, &y, &z);

	/* only update sin and cos if the cvar's changed */
	tmp = accel_angle->value;
	if(tmp != accel_angle_value) {
		/* what happened to sincosf()? */
		accel_sin = sin(DEG2RAD(tmp));
		accel_cos = cos(DEG2RAD(tmp));
		accel_angle_value = tmp;
	}
	tmp = y * accel_cos - z * accel_sin;
	z = z * accel_cos + y * accel_sin;
	y = tmp;

	if (accel_debug->integer) {
		Com_DPrintf("Accelerometer_HandleEvents: y = %d\n", y);
	}

	if (accel_jump->value) {
		float mag = sqrtf(y*y+z*z);
		// HACK - change the sign of jump to be +ve not -ve
		int looks_like_a_jump = (mag > -accel_jump->value) && (z < accel_jump->value / 2.0f);
		if (!jumpTime && looks_like_a_jump) {
			Com_QueueEvent(t, SE_KEY, K_SPACE, qtrue, 0, NULL);
			jumpTime = t;
		} else if (jumpTime && !looks_like_a_jump) {
			Com_QueueEvent(t, SE_KEY, K_SPACE, qfalse, 0, NULL);
			jumpTime = 0;
		}
	}

	if (x > accel_epsilon_x->integer)
		dx = -(x - accel_epsilon_x->integer);
	else if (x < -accel_epsilon_x->integer)
		dx = -(x + accel_epsilon_x->integer);

	if (y > accel_epsilon_y->integer)
		dy = -(y - accel_epsilon_y->integer);
	else if (y < -accel_epsilon_y->integer)
		dy = -(y + accel_epsilon_y->integer);

	Com_QueueEvent(t, SE_ACCEL, dx, dy, 0, NULL);
}

static qboolean motionPressed = qfalse;

qboolean IN_MotionPressed(void)
{
	return motionPressed;
}

static void HandleEvents(void)
{
	int key;
	XEvent event;
	char *p;
	static int x = 0, y = 0;	// absolute
	int dx = 0, dy = 0;	// delta (new-old)
	int t = 0;		// default to 0 in case we don't set

	if (!dpy)
		return;

	while (XPending(dpy)) {
		XNextEvent(dpy, &event);
		switch (event.type) {
		case KeyPress:
			t = Sys_XTimeToSysTime(event.xkey.time);
			p = XLateKey(&event.xkey, &key);
			if (key) {
				Com_QueueEvent(t, SE_KEY, key, qtrue, 0, NULL);
			}
			if (p) {
				while (*p) {
					Com_QueueEvent(t, SE_CHAR, *p++, 0, 0,
						       NULL);
				}
			}
			break;

		case KeyRelease:
			t = Sys_XTimeToSysTime(event.xkey.time);
#if 0
			// bk001206 - handle key repeat w/o XAutRepatOn/Off
			//            also: not done if console/menu is active.
			// From Ryan's Fakk2.
			// see game/q_shared.h, KEYCATCH_* . 0 == in 3d game.  
			if (cls.keyCatchers == 0) {	// FIXME: KEYCATCH_NONE
				if (repeated_press(&event) == qtrue)
					continue;
			}	// if
#endif
			XLateKey(&event.xkey, &key);

			Com_QueueEvent(t, SE_KEY, key, qfalse, 0, NULL);
			break;

		case MotionNotify:
			t = Sys_XTimeToSysTime(event.xkey.time);

			dx = event.xmotion.x;
			dy = event.xmotion.y;

			if (!(Key_GetCatcher() & KEYCATCH_CGAME)) {
			  dx -= (glConfig.vidWidth - SCREEN_WIDTH) / 2;
			  dy -= (glConfig.vidHeight - SCREEN_HEIGHT) / 2;
			}

			dx -= x;
			dy -= y;

#if 0
			Com_Printf ("KeyCatcher: %d\n", Key_GetCatcher());

			Com_Printf ("MotionNotify: event.xmotion = (%d, %d) delta = (%d, %d)\n",
				    event.xmotion.x, event.xmotion.y,
				    dx, dy);
#endif

			x = event.xmotion.x;
			y = event.xmotion.y;
			if (!(Key_GetCatcher() & KEYCATCH_CGAME)) {
			  x -= (glConfig.vidWidth - SCREEN_WIDTH) / 2;
			  y -= (glConfig.vidHeight - SCREEN_HEIGHT) / 2;
			}
			break;

		case ButtonPress:
		case ButtonRelease:
			t = Sys_XTimeToSysTime(event.xkey.time);
			motionPressed = (qboolean) (event.type == ButtonPress);
			if (Key_GetCatcher() & (KEYCATCH_CGAME | KEYCATCH_UI)) {
				Com_QueueEvent(t, SE_KEY, K_MOUSE1,
					       motionPressed, 0, NULL);
			}
			break;

		case CreateNotify:
			win_x = event.xcreatewindow.x;
			win_y = event.xcreatewindow.y;
			break;

		case ConfigureNotify:
			win_x = event.xconfigure.x;
			win_y = event.xconfigure.y;
			break;
		}
	}

	if (motionPressed) {
		Com_QueueEvent(t, SE_MOUSE, dx, dy, 0, NULL);
	}

	Proximity_HandleEvents();

	Accelerometer_HandleEvents();
}

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 = 0x4;
	cursor =
	    XCreatePixmapCursor(display, cursormask, cursormask, &dummycolour,
				&dummycolour, 0, 0);
	XFreePixmap(display, cursormask);
	XFreeGC(display, gc);
	return cursor;
}

static void hildon_set_non_compositing(void)
{
	Atom atom;
	int one = 1;

	atom = XInternAtom(dpy, "_HILDON_NON_COMPOSITED_WINDOW", False);
	XChangeProperty(dpy, win, atom, XA_INTEGER, 32, PropModeReplace,
			(unsigned char *)&one, 1);
}

static void install_grabs(void)
{
	XSync(dpy, False);

	hildon_set_non_compositing();

	XDefineCursor(dpy, win, CreateNullCursor(dpy, win));

	XGrabPointer(dpy, win, False, MOUSE_MASK, GrabModeAsync, GrabModeAsync,
		     win, None, CurrentTime);

	XGetPointerControl(dpy, &mouse_accel_numerator,
			   &mouse_accel_denominator, &mouse_threshold);

	XChangePointerControl(dpy, True, True, 1, 1, 0);

	XSync(dpy, False);

	mwx = glConfig.vidWidth / 2;
	mwy = glConfig.vidHeight / 2;
	mx = my = 0;

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

	XSync(dpy, False);
}

static void uninstall_grabs(void)
{
	XChangePointerControl(dpy, qtrue, qtrue, mouse_accel_numerator,
			      mouse_accel_denominator, mouse_threshold);

	XUngrabPointer(dpy, CurrentTime);
	XUngrabKeyboard(dpy, CurrentTime);

	XUndefineCursor(dpy, win);
}

void IN_ActivateMouse(void)
{
	if (!mouse_avail || !dpy || !win)
		return;

	if (!mouse_active) {
		if (!in_nograb->value)
			install_grabs();
		mouse_active = qtrue;
	}
}

void IN_DeactivateMouse(void)
{
	if (!mouse_avail || !dpy || !win)
		return;

	if (mouse_active) {
		if (!in_nograb->value)
			uninstall_grabs();
		mouse_active = qfalse;
	}
}

void IN_Frame(void)
{
	qboolean loading;

	HandleEvents();

	// If not DISCONNECTED (main menu) or ACTIVE (in game), we're loading
	loading = !!(cls.state != CA_DISCONNECTED && cls.state != CA_ACTIVE);

	if (!r_fullscreen->integer && (Key_GetCatcher() & KEYCATCH_CONSOLE)) {
		// Console is down in windowed mode
		IN_DeactivateMouse();
	} else if (!r_fullscreen->integer && loading) {
		// Loading in windowed mode
		IN_DeactivateMouse();
	} else
		IN_ActivateMouse();
}

void IN_Init(void)
{
	Com_DPrintf("\n------- Input Initialization -------\n");

	// mouse variables
	in_mouse = Cvar_Get("in_mouse", "1", CVAR_ARCHIVE);
	in_nograb = Cvar_Get("in_nograb", "0", CVAR_ARCHIVE);

	if (in_mouse->value) {
		mouse_avail = qtrue;
		IN_ActivateMouse();
	} else {
		IN_DeactivateMouse();
		mouse_avail = qfalse;
	}

	Com_DPrintf("------------------------------------\n");
}

void IN_Shutdown(void)
{
	IN_DeactivateMouse();
	mouse_avail = qfalse;
}

void IN_Restart(void)
{
	IN_Init();
}