/*****************************************************************************
 * Copyright (c) 2010 CEA LIST.
 *
 *    
 * 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:
 *  Patrick Tessier (CEA LIST) Patrick.tessier@cea.fr - Initial API and implementation
 *
 *****************************************************************************/
package org.eclipse.papyrus.sysml.service.types.helper;

import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.gmf.runtime.common.core.command.CommandResult;
import org.eclipse.gmf.runtime.common.core.command.ICommand;
import org.eclipse.gmf.runtime.common.core.command.UnexecutableCommand;
import org.eclipse.gmf.runtime.emf.type.core.IElementMatcher;
import org.eclipse.gmf.runtime.emf.type.core.commands.ConfigureElementCommand;
import org.eclipse.gmf.runtime.emf.type.core.requests.ConfigureRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.GetEditContextRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest;
import org.eclipse.gmf.runtime.emf.type.core.requests.SetRequest;
import org.eclipse.papyrus.sysml.blocks.Block;
import org.eclipse.papyrus.sysml.blocks.ValueType;
import org.eclipse.papyrus.sysml.portandflows.PortandflowsPackage;
import org.eclipse.papyrus.sysml.service.types.matcher.BlockMatcher;
import org.eclipse.papyrus.sysml.service.types.matcher.FlowSpecificationMatcher;
import org.eclipse.papyrus.uml.service.types.helper.advice.AbstractStereotypedElementEditHelperAdvice;
import org.eclipse.papyrus.uml.service.types.utils.NamedElementHelper;
import org.eclipse.uml2.uml.DataType;
import org.eclipse.uml2.uml.Element;
import org.eclipse.uml2.uml.NamedElement;
import org.eclipse.uml2.uml.Signal;
import org.eclipse.uml2.uml.UMLPackage;
import org.eclipse.uml2.uml.util.UMLUtil;
import org.eclipse.uml2.uml.util.UMLUtil.StereotypeApplicationHelper;

/** SysML FlowProperty edit helper advice */
public class FlowPropertyEditHelperAdvice extends AbstractStereotypedElementEditHelperAdvice {

	/** Default constructor */
	public FlowPropertyEditHelperAdvice() {
		requiredProfiles.add(PortandflowsPackage.eINSTANCE);
	}

	/**
	 * Check if the creation context is a FlowSpecification.
	 * 
	 * @see org.eclipse.papyrus.sysml.service.types.helper.AbstractStereotypedElementEditHelperAdvice#approveRequest(org.eclipse.gmf.runtime.emf.type.core.requests.IEditCommandRequest)
	 * 
	 * @param request
	 * @return true if the request is approved
	 */
	@Override
	public boolean approveRequest(IEditCommandRequest request) {
		boolean isApproved = super.approveRequest(request);

		if((request != null) && (request instanceof GetEditContextRequest)) {

			// Retrieve the edit context from request
			GetEditContextRequest editContextRequest = (GetEditContextRequest)request;

			// Test if the edit context is a FlowSpecification
			if(editContextRequest.getEditContext() instanceof Element) {
				Element contextElement = (Element)editContextRequest.getEditContext();

				IElementMatcher matcher = new FlowSpecificationMatcher();
				IElementMatcher blockMatcher = new BlockMatcher();
				if(!matcher.matches(contextElement) && !blockMatcher.matches(contextElement)) {
					isApproved = false;
				}
			}
		}

		return isApproved;
	}

	/** Complete creation process by applying the expected stereotype */
	@Override
	protected ICommand getBeforeConfigureCommand(final ConfigureRequest request) {

		return new ConfigureElementCommand(request) {

			protected CommandResult doExecuteWithResult(IProgressMonitor progressMonitor, IAdaptable info) throws ExecutionException {
				NamedElement element = (NamedElement)request.getElementToConfigure();
				if(element != null) {
					StereotypeApplicationHelper.INSTANCE.applyStereotype(element, PortandflowsPackage.eINSTANCE.getFlowProperty());

					// Set default name
					// Initialize the element name based on the created IElementType
					String initializedName = NamedElementHelper.getDefaultNameWithIncrementFromBase(PortandflowsPackage.eINSTANCE.getFlowProperty().getName().toLowerCase(), element.eContainer().eContents());
					element.setName(initializedName);
				}
				return CommandResult.newOKCommandResult(element);
			}
		};
	}

	/**
	 * Restrict allowed types to {@link Block}, {@link Signal}, {@link DataType}, {@link ValueType}
	 */
	@Override
	protected ICommand getBeforeSetCommand(SetRequest request) {

		// Only allow null, FlowSpecification, Block, Signal, DataType or ValueType as new type.
		if(UMLPackage.eINSTANCE.getTypedElement_Type().equals(request.getFeature())) {
			if(request.getValue() != null) {

				if(!(request.getValue() instanceof Element)) {
					return UnexecutableCommand.INSTANCE; // Should not happen
				}

				Element value = (Element)request.getValue();
				if((value instanceof DataType) || (value instanceof Signal)) {
					return null; // accept these types
				}

				ValueType valueType = UMLUtil.getStereotypeApplication(value, ValueType.class);
				Block block = UMLUtil.getStereotypeApplication(value, Block.class);

				if((block != null) || (valueType != null)) {
					return null; // accept these types
				}

				return UnexecutableCommand.INSTANCE; // forbid other types
			}
		}

		return null;
	}
}