/*******************************************************************************
 * <copyright>
 *
 * Copyright (c) 2005, 2010 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
 *
 * </copyright>
 *
 *******************************************************************************/
package org.eclipse.graphiti.testtool.sketch.features;

import org.eclipse.graphiti.IName;
import org.eclipse.graphiti.dt.IDiagramTypeProvider;
import org.eclipse.graphiti.features.IFeatureProvider;
import org.eclipse.graphiti.features.context.IContext;
import org.eclipse.graphiti.features.context.ICustomContext;
import org.eclipse.graphiti.features.custom.AbstractCustomFeature;
import org.eclipse.graphiti.mm.pictograms.Diagram;
import org.eclipse.graphiti.mm.pictograms.PictogramElement;
import org.eclipse.graphiti.tb.IToolBehaviorProvider;

public class SwitchModeFeature extends AbstractCustomFeature {

	public SwitchModeFeature(IFeatureProvider fp) {
		super(fp);
	}

	private int calculateNextTBPIndex() {
		IDiagramTypeProvider dtp = getFeatureProvider().getDiagramTypeProvider();
		IToolBehaviorProvider[] availableToolBehaviorProviders = dtp.getAvailableToolBehaviorProviders();
		int providerCount = availableToolBehaviorProviders.length;
		int newIndex = (dtp.getCurrentToolBehaviorIndex() + 1) % providerCount;
		return newIndex;
	}

	@Override
	public boolean canExecute(ICustomContext context) {
		if (getDiagramEditor().isDirty()) {
			return false;
		}

		IToolBehaviorProvider[] availableToolBehaviorProviders = getFeatureProvider().getDiagramTypeProvider()
				.getAvailableToolBehaviorProviders();
		return availableToolBehaviorProviders.length > 1;
	}

	public void execute(ICustomContext context) {
		IDiagramTypeProvider dtp = getFeatureProvider().getDiagramTypeProvider();
		int newIndex = calculateNextTBPIndex();
		dtp.setCurrentToolBehaviorIndex(newIndex);
	}

	@Override
	public String getDescription() {
		return getName();
	}

	@Override
	public String getName() {
		IDiagramTypeProvider dtp = getFeatureProvider().getDiagramTypeProvider();
		IToolBehaviorProvider nextTBP = dtp.getAvailableToolBehaviorProviders()[calculateNextTBPIndex()];
		String name = nextTBP.getClass().getSimpleName();
		if (nextTBP instanceof IName) {
			name = ((IName) nextTBP).getName();

		}
		return "Switch to " + name;
	}

	@Override
	public boolean isAvailable(IContext context) {
		if (context instanceof ICustomContext) {
			ICustomContext cContext = (ICustomContext) context;
			PictogramElement[] pes = cContext.getPictogramElements();
			if (pes.length == 1) {
				if (pes[0] instanceof Diagram) {
					return true;
				}
			}
		}
		return false;
	}
}