/*******************************************************************************
 * Copyright (c) 2001, 2010 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.sse.ui.internal;


import org.eclipse.core.resources.IMarker;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.text.source.IAnnotationPresentation;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.ui.ISharedImages;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.texteditor.MarkerAnnotation;
import org.eclipse.wst.sse.ui.internal.reconcile.TemporaryAnnotation;


/**
 * This is overridden to get around the problem of being registered as a
 * org.eclipse.wst.validation.core.problemmarker rather than a
 * org.eclipse.core.resource.problemmarker causing all problems to be skipped
 * in the OverviewRuler
 */
public class StructuredMarkerAnnotation extends MarkerAnnotation implements IAnnotationPresentation {
	// controls if icon should be painted gray
	private boolean fIsGrayed = false;
	String fAnnotationType = null;

	StructuredMarkerAnnotation(IMarker marker) {
		super(marker);
	}

	public final String getAnnotationType() {
		if (fAnnotationType==null){
			initAnnotationType();
		}
		return fAnnotationType;
	}

	/**
	 * Eventually will have to use IAnnotationPresentation &
	 * IAnnotationExtension
	 * 
	 * @see org.eclipse.ui.texteditor.MarkerAnnotation#getImage(org.eclipse.swt.widgets.Display)
	 */
	protected Image getImage(Display display) {
		Image image = null;
		String annotationType = getAnnotationType();
		if (annotationType == TemporaryAnnotation.ANNOT_ERROR) {
			image = PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_ERROR_TSK);
		}
		else if (annotationType == TemporaryAnnotation.ANNOT_WARNING) {
			image = PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_WARN_TSK);
		}
		else if (annotationType == TemporaryAnnotation.ANNOT_INFO) {
			image = PlatformUI.getWorkbench().getSharedImages().getImage(ISharedImages.IMG_OBJS_INFO_TSK);
		}

		if (image != null && isGrayed())
			setImage(getGrayImage(display, image));
		else
			setImage(image);

		return super.getImage(display);
	}

	private Image getGrayImage(Display display, Image image) {
		if (image != null) {
			String key = Integer.toString(image.hashCode());
			// make sure we cache the gray image
			Image grayImage = JFaceResources.getImageRegistry().get(key);
			if (grayImage == null) {
				grayImage = new Image(display, image, SWT.IMAGE_GRAY);
				JFaceResources.getImageRegistry().put(key, grayImage);
			}
			image = grayImage;
		}
		return image;
	}

	public final boolean isGrayed() {
		return fIsGrayed;
	}

	public final void setGrayed(boolean grayed) {
		fIsGrayed = grayed;
	}

	/**
	 * Initializes the annotation's icon representation and its drawing layer
	 * based upon the properties of the underlying marker.
	 */
	protected void initAnnotationType() {

		IMarker marker = getMarker();
		fAnnotationType = TemporaryAnnotation.ANNOT_UNKNOWN;
		try {
			if (marker.exists() && marker.isSubtypeOf(IMarker.PROBLEM)) {
				int severity = marker.getAttribute(IMarker.SEVERITY, -1);
				switch (severity) {
					case IMarker.SEVERITY_ERROR :
						fAnnotationType = TemporaryAnnotation.ANNOT_ERROR;
						break;
					case IMarker.SEVERITY_WARNING :
						fAnnotationType = TemporaryAnnotation.ANNOT_WARNING;
						break;
					case IMarker.SEVERITY_INFO :
						fAnnotationType = TemporaryAnnotation.ANNOT_INFO;
						break;
				}
			}

		}
		catch (CoreException e) {
			Logger.logException(e);
		}
	}
}