/*******************************************************************************
 * Copyright (c) 2004, 2008 Mylyn project committers 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
 *******************************************************************************/
/*
 * Created on Aug 6, 2004
 * Modified for CDT usage Feb 28, 2008
 */
package org.eclipse.cdt.mylyn.internal.ui;

import org.eclipse.cdt.core.model.ICElement;
import org.eclipse.cdt.internal.ui.viewsupport.AppearanceAwareLabelProvider;
import org.eclipse.cdt.internal.ui.viewsupport.CElementImageProvider;
import org.eclipse.cdt.internal.ui.viewsupport.ProblemsLabelDecorator;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.mylyn.context.core.IInteractionElement;
import org.eclipse.mylyn.context.core.IInteractionRelation;
import org.eclipse.mylyn.internal.context.core.InteractionContextManager;
import org.eclipse.mylyn.internal.context.ui.ContextUiImages;
import org.eclipse.swt.graphics.Image;

/**
 * @author Mik Kersten
 * @author Jeff Johnston
 */
public class CDTContextLabelProvider extends AppearanceAwareLabelProvider {

	private static final String LABEL_ELEMENT_MISSING_KEY = "MylynCDT.missingElementLabel"; // $NON-NLS-1$
	private static final String CONTAINMENT_RELATION_NAME_KEY = "MylynCDT.containmentRelation"; // $NON-NLS-1$

	public CDTContextLabelProvider() {
		super(AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS,
				AppearanceAwareLabelProvider.DEFAULT_IMAGEFLAGS | CElementImageProvider.SMALL_ICONS);
	}

	@Override
	public String getText(Object object) {
		if (object instanceof IInteractionElement) {
			IInteractionElement node = (IInteractionElement) object;
			if (CDTStructureBridge.CONTENT_TYPE.equals(node.getContentType())) {
				ICElement element = CDTStructureBridge.getElementForHandle(node.getHandleIdentifier());
				if (element == null) {
					return CDTUIBridgePlugin.getResourceString(LABEL_ELEMENT_MISSING_KEY);
				} else {
					return getTextForElement(element);
				}
			}
		} else if (object instanceof IInteractionRelation) {
			return getNameForRelationship(((IInteractionRelation) object).getRelationshipHandle());
		} else if (object instanceof ICElement) {
			return getTextForElement((ICElement) object);
		}
		return super.getText(object);
	}

	private String getTextForElement(ICElement element) {
		// FIXME: Removed due to missing interface in 3.0.  Should this test be done somehow?
//		if (DelegatingContextLabelProvider.isQualifyNamesMode()) {
//			if (element instanceof IMethod || element instanceof IFunction) {
//				String parentName = ((ICElement) element).getParent().getElementName();
//				if (parentName != null && parentName != "") {
//					return parentName + '.' + super.getText(element);
//				}
//			}
//		}
		if (element.exists()) {
			return super.getText(element);
		} else {
			return CDTUIBridgePlugin.getResourceString(LABEL_ELEMENT_MISSING_KEY);
		}
	}

	@Override
	public Image getImage(Object object) {
		if (object instanceof IInteractionElement) {
			IInteractionElement node = (IInteractionElement) object;
			if (node.getContentType().equals(CDTStructureBridge.CONTENT_TYPE)) {
				ICElement element = CDTStructureBridge.getElementForHandle(node.getHandleIdentifier());
				if (element != null)
					return super.getImage(element);
				return null;
			}
		} else if (object instanceof IInteractionRelation) {
			ImageDescriptor descriptor = getIconForRelationship(((IInteractionRelation) object).getRelationshipHandle());
			if (descriptor != null) {
				return ContextUiImages.getImage(descriptor);
			} else {
				return null;
			}
		}
		return super.getImage(object);
	}

	private ImageDescriptor getIconForRelationship(String relationshipHandle) {
		// We have no relation providers for the CDT
		return null;
	}

	private String getNameForRelationship(String relationshipHandle) {
		if (relationshipHandle.equals(InteractionContextManager.CONTAINMENT_PROPAGATION_ID)) {
			return CDTUIBridgePlugin.getResourceString(CONTAINMENT_RELATION_NAME_KEY);
		} else {
			return null;
		}
	}

	public static AppearanceAwareLabelProvider createCDTUiLabelProvider() {
		AppearanceAwareLabelProvider cdtUiLabelProvider = new AppearanceAwareLabelProvider(
				AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS,
				AppearanceAwareLabelProvider.DEFAULT_IMAGEFLAGS | CElementImageProvider.SMALL_ICONS);
		cdtUiLabelProvider.addLabelDecorator(new ProblemsLabelDecorator(null));
		return cdtUiLabelProvider;
	}
}