/*******************************************************************************
 * Copyright (c) 2002, 2006 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.xml.ui.internal.catalog;

import java.util.Hashtable;

import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jface.resource.ImageRegistry;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.wst.xml.ui.internal.XMLUIPlugin;

public class ImageFactory {
	public static final int TOP_LEFT = 1;
	public static final int TOP_RIGHT = 2;
	public static final int BOTTOM_LEFT = 3;
	public static final int BOTTOM_RIGHT = 4;

	protected static final int[][] OVERLAY_COORDINATE = {{0, 0}, {0, 2}, {2, 0}, {2, 2}};

	protected static ImageFactory INSTANCE = new ImageFactory();

	protected Hashtable compositeImageTable = new Hashtable();

	public ImageFactory() {
		super();
	}

	public Image getImage(String iconName) {
		ImageRegistry imageRegistry = XMLUIPlugin.getDefault().getImageRegistry();

		if (imageRegistry.get(iconName) != null) {
			return imageRegistry.get(iconName);
		}
		else {
			imageRegistry.put(iconName, ImageDescriptor.createFromFile(getClass(), iconName));
			return imageRegistry.get(iconName);
		}
	}

	public Image createCompositeImage(Image base, Image overlay, int overlayPosition) {
		String key = base + "*" + overlay + "*" + overlayPosition; //$NON-NLS-1$ //$NON-NLS-2$
		Image result = (Image) compositeImageTable.get(key);
		if (result == null) {
			ImageDescriptor overlays[][] = new ImageDescriptor[3][3];
			int[] coord = OVERLAY_COORDINATE[overlayPosition];
			overlays[coord[1]][coord[0]] = new ImageBasedImageDescriptor(overlay);
			OverlayIcon icon = new OverlayIcon(new ImageBasedImageDescriptor(base), overlays, new Point(16, 16));
			result = icon.createImage();
			compositeImageTable.put(key, result);
		}
		return result;
	}


	public static ImageDescriptor createImageDescriptorWrapper(Image image) {
		return new ImageBasedImageDescriptor(image);
	}

	/**
	 * An OverlayIcon consists of a main icon and several adornments.
	 */
	class OverlayIcon extends CompositeImageDescriptor {

		static final int DEFAULT_WIDTH = 22;

		static final int DEFAULT_HEIGHT = 16;

		private Point fSize = null;

		private ImageDescriptor fBase;

		private ImageDescriptor fOverlays[][];

		public OverlayIcon(ImageDescriptor base, ImageDescriptor[][] overlays, Point size) {
			fBase = base;
			fOverlays = overlays;
			fSize = size;
		}

		protected void drawBottomLeft(ImageDescriptor[] overlays) {
			if (overlays == null) {
				return;
			}
			int length = overlays.length;
			int x = 0;
			for (int i = 0; i < 3; i++) {
				if ((i < length) && (overlays[i] != null)) {
					ImageData id = overlays[i].getImageData();
					drawImage(id, x, getSize().y - id.height);
					x += id.width;
				}
			}
		}

		protected void drawBottomRight(ImageDescriptor[] overlays) {
			if (overlays == null) {
				return;
			}
			int length = overlays.length;
			int x = getSize().x;
			for (int i = 2; i >= 0; i--) {
				if ((i < length) && (overlays[i] != null)) {
					ImageData id = overlays[i].getImageData();
					x -= id.width;
					drawImage(id, x, getSize().y - id.height);
				}
			}
		}

		/**
		 * @see CompositeImageDescriptor#drawCompositeImage(int, int)
		 */
		protected void drawCompositeImage(int width, int height) {
			ImageData bg;
			if ((fBase == null) || ((bg = fBase.getImageData()) == null)) {
				bg = DEFAULT_IMAGE_DATA;
			}
			drawImage(bg, 0, 0);

			if (fOverlays != null) {
				if (fOverlays.length > 0) {
					drawTopRight(fOverlays[0]);
				}

				if (fOverlays.length > 1) {
					drawBottomRight(fOverlays[1]);
				}

				if (fOverlays.length > 2) {
					drawBottomLeft(fOverlays[2]);
				}

				if (fOverlays.length > 3) {
					drawTopLeft(fOverlays[3]);
				}
			}
		}

		protected void drawTopLeft(ImageDescriptor[] overlays) {
			if (overlays == null) {
				return;
			}
			int length = overlays.length;
			int x = 0;
			for (int i = 0; i < 3; i++) {
				if ((i < length) && (overlays[i] != null)) {
					ImageData id = overlays[i].getImageData();
					drawImage(id, x, 0);
					x += id.width;
				}
			}
		}

		protected void drawTopRight(ImageDescriptor[] overlays) {
			if (overlays == null) {
				return;
			}
			int length = overlays.length;
			int x = getSize().x;
			for (int i = 2; i >= 0; i--) {
				if ((i < length) && (overlays[i] != null)) {
					ImageData id = overlays[i].getImageData();
					x -= id.width;
					drawImage(id, x, 0);
				}
			}
		}

		/**
		 * @see CompositeImageDescriptor#getSize()
		 */
		protected Point getSize() {
			return fSize;
		}
	}

	static class ImageBasedImageDescriptor extends ImageDescriptor {
		protected Image image;

		public ImageBasedImageDescriptor(Image image) {
			this.image = image;
		}

		public ImageData getImageData() {
			return image.getImageData();
		}
	}
}