/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2012 SAP AG.
 * 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:
 *    SAP AG - initial API, implementation and documentation
 *    cbrand - Bug 385586 - Remove,Delete, Update Action (ContextMenu, ButtonPad etc.)
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.ui.internal.action;

import org.eclipse.graphiti.features.IDeleteFeature;
import org.eclipse.graphiti.features.IFeature;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.IContext;
import org.eclipse.graphiti.features.context.IDeleteContext;
import org.eclipse.graphiti.features.context.IMultiDeleteInfo;
import org.eclipse.graphiti.features.context.impl.DeleteContext;
import org.eclipse.graphiti.features.context.impl.MultiDeleteInfo;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.graphiti.ui.internal.Messages;
import org.eclipse.graphiti.ui.platform.IConfigurationProvider;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.ui.actions.ActionFactory;

/**
 * @noinstantiate This class is not intended to be instantiated by clients.
 * @noextend This class is not intended to be subclassed by clients.
 */
public class DeleteAction extends AbstractPreDefinedAction implements IContextAndFeatureProvider {

	private static final String TOOL_TIP = Messages.DeleteAction_0_xmsg;

	private static final String TEXT = Messages.DeleteAction_1_xfld;

	public static final String ACTION_ID = ActionFactory.DELETE.getId();

	private IMultiDeleteInfo multiDeleteInfo = null;

	public DeleteAction(IWorkbenchPart part, IConfigurationProvider configurationProvider) {
		super(part, configurationProvider);
		setId(ACTION_ID);
		setText(TEXT);
		setToolTipText(TOOL_TIP);
	}

	public boolean isAvailable() {
		PictogramElement pe[] = getSelectedPictogramElements();
		for (int i = 0; i < pe.length; i++) {
			IDeleteContext context = new DeleteContext(pe[i]);
			IDeleteFeature deleteFeature = getFeatureProvider().getDeleteFeature(context);
			if (deleteFeature == null || !deleteFeature.isAvailable(context)) {
				return false;
			}
		}

		return true;
	}

	@Override
	protected boolean calculateEnabled() {
		PictogramElement pe[] = getSelectedPictogramElements();
		if (pe.length == 0) {
			return false;
		}
		for (int i = 0; i < pe.length; i++) {
			IDeleteContext context = new DeleteContext(pe[i]);
			IFeatureProvider featureProvider = getFeatureProvider();
			if (featureProvider == null) {
				return false;
			}
			IDeleteFeature deleteFeature = featureProvider.getDeleteFeature(context);
			if (deleteFeature != null && (!deleteFeature.isAvailable(context) || !deleteFeature.canDelete(context))) {
				return false;
			}
		}

		return true;
	}

	@Override
	public void run() {
		int number = getSelectedPictogramElements().length;
		if (number > 1) {
			setMultiDeleteInfo(new MultiDeleteInfo(true, false, number));
		} else {
			setMultiDeleteInfo(null);
		}
		genericRun(this);
	}

	public IContext createContext(PictogramElement pe) {
		DeleteContext deleteContext = new DeleteContext(pe);
		if (getMultiDeleteInfo() != null) {
			deleteContext.setMultiDeleteInfo(getMultiDeleteInfo());
		}
		return deleteContext;
	}

	public IFeature provideFeatureForContext(IContext context) {
		return getFeatureProvider().getDeleteFeature((IDeleteContext) context);
	}

	/**
	 * @return the multiDeleteInfo
	 */
	private IMultiDeleteInfo getMultiDeleteInfo() {
		return multiDeleteInfo;
	}

	/**
	 * @param multiDeleteInfo
	 *            the multiDeleteInfo to set
	 */
	private void setMultiDeleteInfo(IMultiDeleteInfo multiDeleteInfo) {
		this.multiDeleteInfo = multiDeleteInfo;
	}
}