/*
 * Copyright (c) 2002-2008 LWJGL Project
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 * * Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 *
 * * Neither the name of 'LWJGL' nor the names of
 *   its contributors may be used to endorse or promote products derived
 *   from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
package org.lwjgl.opengl;

/**
 * This is the Display implementation interface. Display delegates
 * to implementors of this interface. There is one DisplayImplementation
 * for each supported platform.
 * @author elias_naur
 */

import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.nio.IntBuffer;
import java.awt.Canvas;

import org.lwjgl.LWJGLException;
import org.lwjgl.LWJGLUtil;
import org.lwjgl.BufferUtils;
import org.lwjgl.input.Cursor;

final class WindowsDisplay implements DisplayImplementation {
	private final static int GAMMA_LENGTH = 256;
	private final static int WM_MOUSEMOVE                     = 0x0200;
	private final static int WM_LBUTTONDOWN                   = 0x0201;
	private final static int WM_LBUTTONUP                     = 0x0202;
	private final static int WM_LBUTTONDBLCLK                 = 0x0203;
	private final static int WM_RBUTTONDOWN                   = 0x0204;
	private final static int WM_RBUTTONUP                     = 0x0205;
	private final static int WM_RBUTTONDBLCLK                 = 0x0206;
	private final static int WM_MBUTTONDOWN                   = 0x0207;
	private final static int WM_MBUTTONUP                     = 0x0208;
	private final static int WM_MBUTTONDBLCLK                 = 0x0209;
	private final static int WM_MOUSEWHEEL                    = 0x020A;
	private final static int WM_KEYDOWN						  = 256;
	private final static int WM_KEYUP						  = 257;
	private final static int WM_SYSKEYUP					  = 261;
	private final static int WM_SYSKEYDOWN					  = 260;
	private final static int WM_SYSCHAR                          = 262;
	private final static int WM_CHAR                          = 258;

	private final static int WM_QUIT						  = 0x0012;
	private final static int WM_SYSCOMMAND					  = 0x0112;
	private final static int WM_PAINT 						  = 0x000F;
	private final static int WM_KILLFOCUS                     = 8;
	private final static int WM_SETFOCUS                      = 7;

	private final static int SC_SIZE          = 0xF000;
	private final static int SC_MOVE          = 0xF010;
	private final static int SC_MINIMIZE      = 0xF020;
	private final static int SC_MAXIMIZE      = 0xF030;
	private final static int SC_NEXTWINDOW    = 0xF040;
	private final static int SC_PREVWINDOW    = 0xF050;
	private final static int SC_CLOSE         = 0xF060;
	private final static int SC_VSCROLL       = 0xF070;
	private final static int SC_HSCROLL       = 0xF080;
	private final static int SC_MOUSEMENU     = 0xF090;
	private final static int SC_KEYMENU       = 0xF100;
	private final static int SC_ARRANGE       = 0xF110;
	private final static int SC_RESTORE       = 0xF120;
	private final static int SC_TASKLIST      = 0xF130;
	private final static int SC_SCREENSAVE    = 0xF140;
	private final static int SC_HOTKEY        = 0xF150;
	private final static int SC_DEFAULT       = 0xF160;
	private final static int SC_MONITORPOWER  = 0xF170;
	private final static int SC_CONTEXTHELP   = 0xF180;
	private final static int SC_SEPARATOR     = 0xF00F;

	final static int SM_CXCURSOR      = 13;
	final static int SM_CYCURSOR      = 14;
	final static int SM_CMOUSEBUTTONS      = 43;
	final static int SM_MOUSEWHEELPRESENT = 75;

	private final static int SIZE_RESTORED        = 0;
	private final static int SIZE_MINIMIZED       = 1;
	private final static int SIZE_MAXIMIZED       = 2;
	private final static int WM_SIZE          = 0x0005;
	private final static int WM_ACTIVATE          = 0x0006;
	private final static int     WA_INACTIVE      = 0;
	private final static int     WA_ACTIVE        = 1;
	private final static int     WA_CLICKACTIVE   = 2;
	private final static int SW_SHOWMINNOACTIVE   = 7;
	private final static int SW_SHOWDEFAULT       = 10;
	private final static int SW_RESTORE           = 9;

	private final static IntBuffer rect_buffer = BufferUtils.createIntBuffer(4);
	private final static Rect rect = new Rect();
	private final static Rect rect2 = new Rect();
	private static WindowsDisplay current_display;

	private static boolean cursor_clipped;
	private WindowsDisplayPeerInfo peer_info;
	private Object current_cursor;
	private Canvas parent;

	private WindowsKeyboard keyboard;
	private WindowsMouse mouse;

	private boolean close_requested;
	private boolean is_dirty;

	private ByteBuffer current_gamma;
	private ByteBuffer saved_gamma;
	private DisplayMode current_mode;

	private boolean mode_set;
	private boolean isFullscreen;
	private boolean isMinimized;
	private boolean isFocused;
	private boolean did_maximize;
	private boolean inAppActivate;

	public WindowsDisplay() {
		current_display = this;
	}

	public void createWindow(DisplayMode mode, boolean fullscreen, Canvas parent, int x, int y) throws LWJGLException {
		close_requested = false;
		is_dirty = false;
		isFullscreen = fullscreen;
		isMinimized = false;
		isFocused = false;
		did_maximize = false;
		this.parent = parent;
		long parent_hwnd = parent != null ? getHwnd(parent) : 0;
		boolean isUndecorated = isUndecorated();
		nCreateWindow(mode, fullscreen, x, y, isUndecorated, parent_hwnd);
		peer_info.initDC();
		showWindow(getHwnd(), SW_SHOWDEFAULT);
		if (parent == null) {
			setForegroundWindow(getHwnd());
			setFocus(getHwnd());
		}
	}
	private native void nCreateWindow(DisplayMode mode, boolean fullscreen, int x, int y, boolean undecorated, long parent_hwnd) throws LWJGLException;

	private static boolean isUndecorated() {
		return Display.getPrivilegedBoolean("org.lwjgl.opengl.Window.undecorated"); 
	}

	private static long getHwnd(Canvas parent) throws LWJGLException {
		AWTCanvasImplementation awt_impl = AWTGLCanvas.createImplementation();
		WindowsPeerInfo parent_peer_info = (WindowsPeerInfo)awt_impl.createPeerInfo(parent, null);
		ByteBuffer parent_peer_info_handle = parent_peer_info.lockAndGetHandle();
		try {
			return parent_peer_info.getHwnd();
		} finally { 
			parent_peer_info.unlock();
		}
	}

	public void destroyWindow() {
		nDestroyWindow();
		resetCursorClipping();
	}
	private static native void nDestroyWindow();
	static void resetCursorClipping() {
		if (cursor_clipped) {
			try {
				clipCursor(null);
			} catch (LWJGLException e) {
				LWJGLUtil.log("Failed to reset cursor clipping: " + e);
			}
			cursor_clipped = false;
		}
	}

	private static void getGlobalClientRect(long hwnd, Rect rect) {
		rect_buffer.put(0, 0).put(1, 0);
		clientToScreen(hwnd, rect_buffer);
		int offset_x = rect_buffer.get(0);
		int offset_y = rect_buffer.get(1);
		getClientRect(hwnd, rect_buffer);
		rect.copyFromBuffer(rect_buffer);
		rect.offset(offset_x, offset_y);
	}

	static WindowsDirectInput createDirectInput() throws LWJGLException {
		try {
			return new WindowsDirectInput8(getDllInstance());
		} catch (LWJGLException e) {
			LWJGLUtil.log("Failed to create DirectInput 8 interface, falling back to DirectInput 3");
			return new WindowsDirectInput3(getDllInstance());
		}
	}

	static void setupCursorClipping(long hwnd) throws LWJGLException {
		cursor_clipped = true;
		getGlobalClientRect(hwnd, rect);
		rect.copyToBuffer(rect_buffer);
		clipCursor(rect_buffer);
	}
	private static native void clipCursor(IntBuffer rect) throws LWJGLException;

	public void switchDisplayMode(DisplayMode mode) throws LWJGLException {
		nSwitchDisplayMode(mode);
		current_mode = mode;
		mode_set = true;
	}
	private static native void nSwitchDisplayMode(DisplayMode mode) throws LWJGLException;

	/*
	 * Called when the application is alt-tabbed to or from
	 */
	private void appActivate(boolean active) {
		if (inAppActivate) {
			return;
		}
		inAppActivate = true;
		isFocused = active;
		if (active) {
			if (isFullscreen) {
				restoreDisplayMode();
			}
			if (parent == null) {
				showWindow(getHwnd(), SW_RESTORE);
				setForegroundWindow(getHwnd());
				setFocus(getHwnd());
			}
			did_maximize = true;
			if (isFullscreen)
				updateClipping();
		} else if (isFullscreen) {
			showWindow(getHwnd(), SW_SHOWMINNOACTIVE);
			resetDisplayMode();
		} else
			updateClipping();
		updateCursor();
		inAppActivate = false;
	}
	private static native void showWindow(long hwnd, int mode);
	private static native void setForegroundWindow(long hwnd);
	private static native void setFocus(long hwnd);

	private void restoreDisplayMode() {
		try {
			doSetGammaRamp(current_gamma);
		} catch (LWJGLException e) {
			LWJGLUtil.log("Failed to restore gamma: " + e.getMessage());
		}

		if (!mode_set) {
			mode_set = true;
			try {
				nSwitchDisplayMode(current_mode);
			} catch (LWJGLException e) {
				LWJGLUtil.log("Failed to restore display mode: " + e.getMessage());
			}
		}
	}

	public void resetDisplayMode() {
		try {
			doSetGammaRamp(saved_gamma);
		} catch (LWJGLException e) {
			LWJGLUtil.log("Failed to reset gamma ramp: " + e.getMessage());
		}
		current_gamma = saved_gamma;
		if (mode_set) {
			mode_set = false;
			nResetDisplayMode();
		}
		resetCursorClipping();
	}
	private static native void nResetDisplayMode();

	public int getGammaRampLength() {
		return GAMMA_LENGTH;
	}

	public void setGammaRamp(FloatBuffer gammaRamp) throws LWJGLException {
		doSetGammaRamp(convertToNativeRamp(gammaRamp));
	}
	private static native ByteBuffer convertToNativeRamp(FloatBuffer gamma_ramp) throws LWJGLException;
	private static native ByteBuffer getCurrentGammaRamp() throws LWJGLException;

	private void doSetGammaRamp(ByteBuffer native_gamma) throws LWJGLException {
		nSetGammaRamp(native_gamma);
		current_gamma = native_gamma;
	}
	private static native void nSetGammaRamp(ByteBuffer native_ramp) throws LWJGLException;

	public String getAdapter() {
		try {
			String adapter_string = WindowsRegistry.queryRegistrationKey(
					WindowsRegistry.HKEY_LOCAL_MACHINE,
					"HARDWARE\\DeviceMap\\Video",
					"\\Device\\Video0");
			String root_key = "\\registry\\machine\\";
			if (adapter_string.toLowerCase().startsWith(root_key)) {
				String driver_value = WindowsRegistry.queryRegistrationKey(
						WindowsRegistry.HKEY_LOCAL_MACHINE,
						adapter_string.substring(root_key.length()),
						"InstalledDisplayDrivers");
				return driver_value;
			}
		} catch (LWJGLException e) {
			LWJGLUtil.log("Exception occurred while querying registry: " + e);
		}
		return null;
	}
	
	public String getVersion() {
		String driver = getAdapter();
		if (driver != null) {
			WindowsFileVersion version = nGetVersion(driver + ".dll");
			if (version != null)
				return version.toString();
		}
		return null;
	}
	private native WindowsFileVersion nGetVersion(String driver);

	public DisplayMode init() throws LWJGLException {
		current_gamma = saved_gamma = getCurrentGammaRamp();
		return current_mode = getCurrentDisplayMode();
	}
	private static native DisplayMode getCurrentDisplayMode() throws LWJGLException;

	public native void setTitle(String title);

	public boolean isCloseRequested() {
		boolean saved = close_requested;
		close_requested = false;
		return saved;
	}

	public boolean isVisible() {
		return !isMinimized;
	}

	public boolean isActive() {
		return isFocused;
	}

	public boolean isDirty() {
		boolean saved = is_dirty;
		is_dirty = false;
		return saved;
	}

	public PeerInfo createPeerInfo(PixelFormat pixel_format) throws LWJGLException {
		peer_info = new WindowsDisplayPeerInfo(pixel_format);
		return peer_info;
	}

	public void update() {
		nUpdate();
		if (parent != null && parent.isFocusOwner()) {
			setFocus(getHwnd());
		}
		if (did_maximize) {
			did_maximize = false;
			/**
			 * WORKAROUND:
			 * Making the context current (redundantly) when the window
			 * is maximized helps some gfx cards recover from fullscreen
			 */
			try {
				if (Display.getDrawable().getContext() != null && Display.getDrawable().getContext().isCurrent())
					Display.getDrawable().getContext().makeCurrent();
			} catch (LWJGLException e) {
				LWJGLUtil.log("Exception occurred while trying to make context current: " + e);
			}
		}
	}
	private static native void nUpdate();

	public void reshape(int x, int y, int width, int height) {
		if (!isFullscreen)
			nReshape(getHwnd(), x, y, width, height, isUndecorated(), parent != null);
	}
	private static native void nReshape(long hwnd, int x, int y, int width, int height, boolean undecorated, boolean child);
	public native DisplayMode[] getAvailableDisplayModes() throws LWJGLException;

	/* Mouse */
	public boolean hasWheel() {
		return mouse.hasWheel();
	}

	public int getButtonCount() {
		return mouse.getButtonCount();
	}

	public void createMouse() throws LWJGLException {
		mouse = new WindowsMouse(getHwnd());
	}

	public void destroyMouse() {
		if (mouse != null)
			mouse.destroy();
		mouse = null;
	}

	public void pollMouse(IntBuffer coord_buffer, ByteBuffer buttons) {
		mouse.poll(coord_buffer, buttons);
	}
	
	public void readMouse(ByteBuffer buffer) {
		mouse.read(buffer);
	}
		
	public void grabMouse(boolean grab) {
		mouse.grab(grab, shouldGrab());
		updateCursor();
	}

	public int getNativeCursorCapabilities() {
		return Cursor.CURSOR_ONE_BIT_TRANSPARENCY;
	}

	public void setCursorPosition(int x, int y) {
		getGlobalClientRect(getHwnd(), rect);
		int transformed_x = rect.left + x;
		int transformed_y = rect.bottom - 1 - y;
		nSetCursorPosition(transformed_x, transformed_y);
		setMousePosition(x, y);
	}
	private static native void nSetCursorPosition(int x, int y);

	public void setNativeCursor(Object handle) throws LWJGLException {
		current_cursor = handle;
		updateCursor();
	}

	private void updateCursor() {
		try {
			if (mouse != null && shouldGrab())
				nSetNativeCursor(getHwnd(), mouse.getBlankCursor());
			else
				nSetNativeCursor(getHwnd(), current_cursor);
		} catch (LWJGLException e) {
			LWJGLUtil.log("Failed to update cursor: " + e);
		}
	}
	static native void nSetNativeCursor(long hwnd, Object handle) throws LWJGLException;

	public int getMinCursorSize() {
		return getSystemMetrics(SM_CXCURSOR);
	}

	public int getMaxCursorSize() {
		return getSystemMetrics(SM_CXCURSOR);
	}

	static native int getSystemMetrics(int index);

	private static native long getDllInstance();
	private static native long getHwnd();
	private static native long getDesktopWindow();
	static void centerCursor(long hwnd) {
		getGlobalClientRect(getHwnd(), rect);
		int local_offset_x = rect.left;
		int local_offset_y = rect.top;
		getGlobalClientRect(getDesktopWindow(), rect2);
		Rect.intersect(rect, rect2, rect);
		int center_x = (rect.left + rect.right)/2;
		int center_y = (rect.top + rect.bottom)/2;
		nSetCursorPosition(center_x, center_y);
		int local_x = center_x - local_offset_x;
		int local_y = center_y - local_offset_y;
		if (current_display != null)
			current_display.setMousePosition(local_x, transformY(getHwnd(), local_y));
	}

	private void setMousePosition(int x, int y) {
		if (mouse != null)
			mouse.setPosition(x, y);
	}

	/* Keyboard */
	public void createKeyboard() throws LWJGLException {
		keyboard = new WindowsKeyboard(getHwnd());
	}

	public void destroyKeyboard() {
		keyboard.destroy();
		keyboard = null;
	}
	
	public void pollKeyboard(ByteBuffer keyDownBuffer) {
		keyboard.poll(keyDownBuffer);
	}
	
	public void readKeyboard(ByteBuffer buffer) {
		keyboard.read(buffer);
	}

//	public native int isStateKeySet(int key);

	public static native ByteBuffer nCreateCursor(int width, int height, int xHotspot, int yHotspot, int numImages, IntBuffer images, int images_offset, IntBuffer delays, int delays_offset) throws LWJGLException;

	public Object createCursor(int width, int height, int xHotspot, int yHotspot, int numImages, IntBuffer images, IntBuffer delays) throws LWJGLException {
		return doCreateCursor(width, height, xHotspot, yHotspot, numImages, images, delays);
	}

	static Object doCreateCursor(int width, int height, int xHotspot, int yHotspot, int numImages, IntBuffer images, IntBuffer delays) throws LWJGLException {
		return nCreateCursor(width, height, xHotspot, yHotspot, numImages, images, images.position(), delays, delays != null ? delays.position() : -1);
	}

	public void destroyCursor(Object cursorHandle) {
		doDestroyCursor(cursorHandle);
	}
	static native void doDestroyCursor(Object cursorHandle);

	public int getPbufferCapabilities() {
		try {
		// Return the capabilities of a minimum pixel format
			return nGetPbufferCapabilities(new PixelFormat(0, 0, 0, 0, 0, 0, 0, 0, false));
		} catch (LWJGLException e) {
			LWJGLUtil.log("Exception occurred while determining pbuffer capabilities: " + e);
			return 0;
		}
	}
	private native int nGetPbufferCapabilities(PixelFormat format) throws LWJGLException;
	
	public boolean isBufferLost(PeerInfo handle) {
		return ((WindowsPbufferPeerInfo)handle).isBufferLost();
	}

	public PeerInfo createPbuffer(int width, int height, PixelFormat pixel_format,
			IntBuffer pixelFormatCaps,
			IntBuffer pBufferAttribs) throws LWJGLException {
		return new WindowsPbufferPeerInfo(width, height, pixel_format, pixelFormatCaps, pBufferAttribs);
	}
	
	public void setPbufferAttrib(PeerInfo handle, int attrib, int value) {
		((WindowsPbufferPeerInfo)handle).setPbufferAttrib(attrib, value);
	}

	public void bindTexImageToPbuffer(PeerInfo handle, int buffer) {
		((WindowsPbufferPeerInfo)handle).bindTexImageToPbuffer(buffer);
	}
	
	public void releaseTexImageFromPbuffer(PeerInfo handle, int buffer) {
		((WindowsPbufferPeerInfo)handle).releaseTexImageFromPbuffer(buffer);
	}
	

	/**
	 * Sets one or more icons for the Display.
	 * <ul>
	 * <li>On Windows you should supply at least one 16x16 icon and one 32x32.</li>
	 * <li>Linux (and similar platforms) expect one 32x32 icon.</li>
	 * <li>Mac OS X should be supplied one 128x128 icon</li>
	 * </ul>
	 * The implementation will use the supplied ByteBuffers with image data in RGBA and perform any conversions nescesarry for the specific platform.
	 *
	 * @param icons Array of icons in RGBA mode
	 * @return number of icons used.
	 */
	public int setIcon(ByteBuffer[] icons) {
		boolean done_small = false;
		boolean done_large = false;
		int used = 0;
		
		int small_icon_size = 16;
		int large_icon_size = 32;
		for (int i=0;i<icons.length;i++) {
			int size = icons[i].limit() / 4;
			
			if ((((int) Math.sqrt(size)) == small_icon_size) && (!done_small)) {
				nSetWindowIconSmall(small_icon_size, small_icon_size, icons[i].asIntBuffer());
				used++;
				done_small = true;
			}
			if ((((int) Math.sqrt(size)) == large_icon_size) && (!done_large)) {
				nSetWindowIconLarge(large_icon_size, large_icon_size, icons[i].asIntBuffer());
				used++;
				done_large = true;
			}
		}
		
		return used;
	}

	private static native int nSetWindowIconSmall(int width, int height, IntBuffer icon);
	
	private static native int nSetWindowIconLarge(int width, int height, IntBuffer icon);

	private void handleMouseButton(int button, int state, long millis) {
		if (mouse != null)
			mouse.handleMouseButton((byte)button, (byte)state, millis);
	}

	private boolean shouldGrab() {
		return !isMinimized && isFocused && mouse != null && mouse.isGrabbed();
	}

	private void handleMouseMoved(int x, int y, long millis) {
		if (mouse != null)
			mouse.handleMouseMoved(x, y, millis, shouldGrab());
	}

	private void handleMouseScrolled(int amount, long millis) {
		if (mouse != null)
			mouse.handleMouseScrolled(amount, millis);
	}

	private static native void getClientRect(long hwnd, IntBuffer rect);

	private void handleChar(long wParam, long lParam, long millis) {
		byte previous_state = (byte)((lParam >>> 30) & 0x1);
		byte state = (byte)(1 - ((lParam >>> 31) & 0x1));
		boolean repeat = state == previous_state;
		if (keyboard != null)
			keyboard.handleChar((int)(wParam & 0xFF), millis, repeat);
	}

	private void handleKeyButton(long wParam, long lParam, long millis) {
		byte previous_state = (byte)((lParam >>> 30) & 0x1);
		byte state = (byte)(1 - ((lParam >>> 31) & 0x1));
		boolean repeat = state == previous_state; // Repeat message
		byte extended = (byte)((lParam >>> 24) & 0x1);
		int scan_code = (int)((lParam >>> 16) & 0xFF);
		if (keyboard != null)
			keyboard.handleKey((int)wParam, scan_code, extended != 0, state, millis, repeat);
	}

	private static int transformY(long hwnd, int y) {
		getClientRect(hwnd, rect_buffer);
		rect.copyFromBuffer(rect_buffer);
		return (rect.bottom - rect.top) - 1 - y;
	}

	private static native void clientToScreen(long hwnd, IntBuffer point);

	private static int handleMessage(long hwnd, int msg, long wParam, long lParam, long millis) {
		if (current_display != null)
			return current_display.doHandleMessage(hwnd, msg, wParam, lParam, millis);
		else
			return defWindowProc(hwnd, msg, wParam, lParam);
	}
	
	private static native int defWindowProc(long hwnd, int msg, long wParam, long lParam);

	private void checkCursorState() {
		updateCursor();
		updateClipping();
	}

	private void updateClipping() {
		if ((isFullscreen || (mouse != null && mouse.isGrabbed())) && !isMinimized && isFocused) {
			try {
				setupCursorClipping(getHwnd());
			} catch (LWJGLException e) {
				LWJGLUtil.log("setupCursorClipping failed: " + e.getMessage());
			}
		} else {
			resetCursorClipping();
		}
	}

	private void setMinimized(boolean m) {
		isMinimized = m;
		checkCursorState();
	}

	private int doHandleMessage(long hwnd, int msg, long wParam, long lParam, long millis) {
		switch (msg) {
			// disable screen saver and monitor power down messages which wreak havoc
			case WM_ACTIVATE:
				switch ((int)wParam) {
					case WA_ACTIVE:
					case WA_CLICKACTIVE:
						appActivate(true);
						break;
					case WA_INACTIVE:
						appActivate(false);
						break;
				}
				return 0;
			case WM_SIZE:
				switch ((int)wParam) {
					case SIZE_RESTORED:
					case SIZE_MAXIMIZED:
						setMinimized(false);
						break;
					case SIZE_MINIMIZED:
						setMinimized(true);
						break;
				}
				return defWindowProc(hwnd, msg, wParam, lParam);
			case WM_KILLFOCUS:
				appActivate(false);
				return 0;
			case WM_SETFOCUS:
				appActivate(true);
				return 0;
			case WM_MOUSEMOVE:
				int xPos = (int)(short)(lParam & 0xFFFF);
				int yPos = transformY(getHwnd(), (int)(short)((lParam >> 16) & 0xFFFF));
				handleMouseMoved(xPos, yPos, millis);
				checkCursorState();
				return 0;
			case WM_MOUSEWHEEL:
				int dwheel = (int)(short)((wParam >> 16) & 0xFFFF);
				handleMouseScrolled(dwheel, millis);
				return 0;
			case WM_LBUTTONDOWN:
				handleMouseButton(0, 1, millis);
				return 0;
			case WM_LBUTTONUP:
				handleMouseButton(0, 0, millis);
				return 0;
			case WM_RBUTTONDOWN:
				handleMouseButton(1, 1, millis);
				return 0;
			case WM_RBUTTONUP:
				handleMouseButton(1, 0, millis);
				return 0;
			case WM_MBUTTONDOWN:
				handleMouseButton(2, 1, millis);
				return 0;
			case WM_MBUTTONUP:
				handleMouseButton(2, 0, millis);
				return 0;
			case WM_SYSCHAR:
			case WM_CHAR:
				handleChar(wParam, lParam, millis);
				return 0;
			case WM_SYSKEYUP:
				/* Fall through */
			case WM_KEYUP:
				// SysRq apparently only generates WM_KEYUP, so we'll fake a WM_KEYDOWN
				if (wParam == WindowsKeycodes.VK_SNAPSHOT && keyboard != null &&
						!keyboard.isKeyDown(org.lwjgl.input.Keyboard.KEY_SYSRQ)) {
					// Set key state to pressed
					long fake_lparam = lParam & ~(1 << 31);
					// Set key previous state to released
					fake_lparam = fake_lparam & ~(1 << 30);
					handleKeyButton(wParam, fake_lparam, millis);
				}
				/* Fall through */
			case WM_SYSKEYDOWN:
				/* Fall through */
			case WM_KEYDOWN:
				handleKeyButton(wParam, lParam, millis);
				return defWindowProc(hwnd, msg, wParam, lParam);
			case WM_QUIT:
				close_requested = true;
				return 0;
			case WM_SYSCOMMAND:
				switch ((int)(wParam & 0xfff0)) {
					case SC_KEYMENU:
					case SC_MOUSEMENU:
					case SC_SCREENSAVE:
					case SC_MONITORPOWER:
						return 0;
					case SC_CLOSE:
						close_requested = true;
						return 0;
					default:
						break;
				}
				return defWindowProc(hwnd, msg, wParam, lParam);
			case WM_PAINT:
				is_dirty = true;
				return defWindowProc(hwnd, msg, wParam, lParam);
			default:
				return defWindowProc(hwnd, msg, wParam, lParam);
		}
	}

	public int getWidth() {
		return Display.getDisplayMode().getWidth();
	}

	public int getHeight() {
		return Display.getDisplayMode().getHeight();
	}

	private static final class Rect {
		public int top;
		public int bottom;
		public int left;
		public int right;

		public void copyToBuffer(IntBuffer buffer) {
			buffer.put(0, top).put(1, bottom).put(2, left).put(3, right);
		}

		public void copyFromBuffer(IntBuffer buffer) {
			top = buffer.get(0);
			bottom = buffer.get(1);
			left  = buffer.get(2);
			right = buffer.get(3);
		}

		public void offset(int offset_x, int offset_y) {
			left += offset_x;
			right += offset_x;
			top += offset_y;
			bottom += offset_y;
		}

		public static void intersect(Rect r1, Rect r2, Rect dst) {
			dst.top = Math.max(r1.top, r2.top);
			dst.bottom = Math.min(r1.bottom, r2.bottom);
			dst.left = Math.max(r1.left, r2.left);
			dst.right = Math.min(r1.right, r2.right);
		}

		public String toString() {
			return "Rect: top = " + top + " bottom = " + bottom + " left = " + left + " right = " + right;
		}
	}
}