/*******************************************************************************
 * Copyright (c) 2005, 2017 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
 *
 *******************************************************************************/
package org.eclipse.dltk.ui;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jface.resource.CompositeImageDescriptor;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;

public class ScriptElementImageDescriptor extends CompositeImageDescriptor {
	/** Flag to render the abstract adornment. */
	public final static int ABSTRACT = 0x001;

	/** Flag to render the final adornment. */
	public final static int FINAL = 0x002;

	/** Flag to render the static adornment. */
	public final static int STATIC = 0x008;

	/** Flag to render the 'constructor' adornment. */
	public final static int CONSTRUCTOR = 0x200;

	/** Flag to render the 'override' adornment. */
	public final static int OVERRIDES = 0x080;

	/** Flag to render the 'implements' adornment. */
	public final static int IMPLEMENTS = 0x100;

	/** Flag to render the warning adornment. */
	public final static int WARNING = 0x020;

	/** Flag to render the error adornment. */
	public final static int ERROR = 0x040;

	/**
	 * Flag to render the 'deprecated' adornment.
	 *
	 * @since 5.0
	 */
	public final static int DEPRECATED = 0x400;

	private Point fSize;
	private final int fFlags;

	private final ImageDescriptor fBaseImage;

	public ScriptElementImageDescriptor(ImageDescriptor baseImageDescriptor,
			int flags, Point size) {
		fBaseImage = baseImageDescriptor;
		Assert.isNotNull(fBaseImage);
		fFlags = flags;
		Assert.isTrue(fFlags >= 0);
		fSize = size;
		Assert.isNotNull(fSize);
	}

	/**
	 * Sets the size of the image created by calling <code>createImage()</code>.
	 *
	 * @param size
	 *            the size of the image returned from calling
	 *            <code>createImage()</code>
	 * @see ImageDescriptor#createImage()
	 */
	public void setImageSize(Point size) {
		Assert.isNotNull(size);
		Assert.isTrue(size.x >= 0 && size.y >= 0);
		fSize = size;
	}

	/**
	 * Returns the size of the image created by calling
	 * <code>createImage()</code>.
	 *
	 * @return the size of the image created by calling
	 *         <code>createImage()</code>
	 * @see ImageDescriptor#createImage()
	 */
	public Point getImageSize() {
		return new Point(fSize.x, fSize.y);
	}

	@Override
	protected Point getSize() {
		return fSize;
	}

	@Override
	public boolean equals(Object object) {
		if (object == null
				|| !ScriptElementImageDescriptor.class
						.equals(object.getClass())) {
			return false;
		}

		ScriptElementImageDescriptor other = (ScriptElementImageDescriptor) object;

		return (other.fFlags == this.fFlags)
				&& fBaseImage.equals(other.fBaseImage)
				&& fSize.equals(other.fSize);
	}

	@Override
	public int hashCode() {
		return fBaseImage.hashCode() | fSize.hashCode() | this.fFlags;
	}

	private ImageData getImageData(ImageDescriptor descriptor) {
		ImageData data = descriptor.getImageData(); // see bug 51965:
													// getImageData can return
													// null
		if (data == null) {
			data = DEFAULT_IMAGE_DATA;
			System.err
					.println("Image data not available: " + descriptor.toString()); //$NON-NLS-1$
			// DLTKUIPlugin.logErrorMessage("Image data not available: " + descriptor.toString()); //$NON-NLS-1$
		}
		return data;
	}

	@Override
	protected void drawCompositeImage(int width, int height) {
		ImageData bg = getImageData(fBaseImage);

		if ((fFlags & DEPRECATED) != 0) { // draw *behind* the full image
			Point size = getSize();
			ImageData data = getImageData(DLTKPluginImages.DESC_OVR_DEPRECATED);
			drawImage(data, 0, size.y - data.height);
		}
		if (bg != null) {
			drawImage(bg, 0, 0);
		}
		drawTopRight();
		drawBottomRight();
		drawBottomLeft();
	}

	private void drawBottomLeft() {
		Point size = getSize();
		int x = 0;
		if ((fFlags & ERROR) != 0) {
			ImageData data = getImageData(DLTKPluginImages.DESC_OVR_ERROR);
			drawImage(data, x, size.y - data.height);
			x += data.width;
		}
		if ((fFlags & WARNING) != 0) {
			ImageData data = getImageData(DLTKPluginImages.DESC_OVR_WARNING);
			drawImage(data, x, size.y - data.height);
			x += data.width;
		}

	}

	private void drawTopRight() {
		Point pos = new Point(getSize().x, 0);
		if ((fFlags & ABSTRACT) != 0) {
			addTopRightImage(DLTKPluginImages.DESC_OVR_ABSTRACT, pos);
		}
		if ((fFlags & CONSTRUCTOR) != 0) {
			addTopRightImage(DLTKPluginImages.DESC_OVR_CONSTRUCTOR, pos);
		}
		if ((fFlags & FINAL) != 0) {
			addTopRightImage(DLTKPluginImages.DESC_OVR_FINAL, pos);
		}
		if ((fFlags & STATIC) != 0) {
			addTopRightImage(DLTKPluginImages.DESC_OVR_STATIC, pos);
		}

	}

	private void drawBottomRight() {
		Point size = getSize();
		Point pos = new Point(size.x, size.y);

		int flags = fFlags;

		if ((flags & OVERRIDES) != 0) {
			addBottomRightImage(DLTKPluginImages.DESC_OVR_OVERRIDES, pos);
		}
		if ((flags & IMPLEMENTS) != 0) {
			addBottomRightImage(DLTKPluginImages.DESC_OVR_IMPLEMENTS, pos);
		}
	}

	private void addTopRightImage(ImageDescriptor desc, Point pos) {
		ImageData data = getImageData(desc);
		int x = pos.x - data.width;
		if (x >= 0) {
			drawImage(data, x, pos.y);
			pos.x = x;
		}
	}

	private void addBottomRightImage(ImageDescriptor desc, Point pos) {
		ImageData data = getImageData(desc);
		int x = pos.x - data.width;
		int y = pos.y - data.height;
		if (x >= 0 && y >= 0) {
			drawImage(data, x, y);
			pos.x = x;
		}
	}

}