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/*******************************************************************************
 * Copyright 2011 See AUTHORS file.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *   http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 ******************************************************************************/

package com.badlogic.gdx.backends.gwt;

import com.badlogic.gdx.Gdx;
import com.badlogic.gdx.graphics.Cursor;
import com.badlogic.gdx.graphics.Pixmap;
import com.badlogic.gdx.utils.GdxRuntimeException;
import com.google.gwt.dom.client.CanvasElement;

public class GwtCursor implements Cursor {
	String cssCursorProperty;

	public GwtCursor (Pixmap pixmap, int xHotspot, int yHotspot) {
		if (pixmap == null) {
			this.cssCursorProperty = "auto";
			return;
		}

		if (pixmap.getFormat() != Pixmap.Format.RGBA8888) {
			throw new GdxRuntimeException("Cursor image pixmap is not in RGBA8888 format.");
		}

		if ((pixmap.getWidth() & (pixmap.getWidth() - 1)) != 0) {
			throw new GdxRuntimeException("Cursor image pixmap width of " + pixmap.getWidth()
				+ " is not a power-of-two greater than zero.");
		}

		if ((pixmap.getHeight() & (pixmap.getHeight() - 1)) != 0) {
			throw new GdxRuntimeException("Cursor image pixmap height of " + pixmap.getHeight()
				+ " is not a power-of-two greater than zero.");
		}

		if (xHotspot < 0 || xHotspot >= pixmap.getWidth()) {
			throw new GdxRuntimeException("xHotspot coordinate of " + xHotspot + " is not within image width bounds: [0, "
				+ pixmap.getWidth() + ").");
		}

		if (yHotspot < 0 || yHotspot >= pixmap.getHeight()) {
			throw new GdxRuntimeException("yHotspot coordinate of " + yHotspot + " is not within image height bounds: [0, "
				+ pixmap.getHeight() + ").");
		}
		cssCursorProperty = "url('";
		cssCursorProperty += pixmap.getCanvasElement().toDataUrl("image/png");
		cssCursorProperty += "')";
		cssCursorProperty += xHotspot;
		cssCursorProperty += " ";
		cssCursorProperty += yHotspot;
		cssCursorProperty += ",auto";
	}
	
	static String getNameForSystemCursor (SystemCursor systemCursor) {
		if (systemCursor == SystemCursor.Arrow) {
			return "default";
		} else if (systemCursor == SystemCursor.Crosshair) {
			return "crosshair";
		} else if (systemCursor == SystemCursor.Hand) {
			return "pointer"; // Don't change to 'hand', 'hand' doesn't work in the newer IEs
		} else if (systemCursor == SystemCursor.HorizontalResize) {
			return "ew-resize";
		} else if (systemCursor == SystemCursor.VerticalResize) {
			return "ns-resize";
		} else if (systemCursor == SystemCursor.Ibeam) {
			return "text";
		} else {
			throw new GdxRuntimeException("Unknown system cursor " + systemCursor);
		}
		
	}

	@Override
	public void dispose () {
	}
}