/**
 * Copyright (c) 2010-2012 ISBAN S.L
 * 
 * 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:
 * 		Ruben De Dios (ISBAN S.L)
 * 		Andrez Alvarez Mattos (ISBAN S.L)
 */
package org.eclipse.gmf.tooling.simplemap.model.triggers;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.emf.ecore.EClass;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature.Setting;
import org.eclipse.emf.ecore.util.EcoreUtil;
import org.eclipse.emf.edit.command.AbstractOverrideableCommand;
import org.eclipse.emf.transaction.RecordingCommand;
import org.eclipse.emf.transaction.TransactionalEditingDomain;
import org.eclipse.gmf.gmfgraph.ChildAccess;
import org.eclipse.gmf.gmfgraph.Compartment;
import org.eclipse.gmf.gmfgraph.DiagramElement;
import org.eclipse.gmf.gmfgraph.DiagramLabel;
import org.eclipse.gmf.gmfgraph.FigureDescriptor;
import org.eclipse.gmf.gmfgraph.GMFGraphPackage;
import org.eclipse.gmf.gmfgraph.Identity;
import org.eclipse.gmf.mappings.GMFMapPackage;
import org.eclipse.gmf.tooldef.AbstractTool;
import org.eclipse.gmf.tooldef.ToolContainer;

/**
 * Trigger abstracto con un RecordingCommand interno que se encarga de grabar las modificaciones hechas por el comando
 * y del undo y el redo
 * Todos los triggers que precisen de undo/redo deberian extender esta clase
 * @author xIS05655
 *
 */
public abstract class AbstractTrigger extends AbstractOverrideableCommand {

	private RecordingCommand internalCommand;

	public AbstractTrigger(TransactionalEditingDomain domain) {
		super(domain);

		internalCommand = new RecordingCommand(domain) {

			@Override
			protected void doExecute() {
				try {
					executeTrigger();
				} catch (Exception exc) {
					exc.printStackTrace();
				}

			}
		};
	}

	@Override
	public final void doExecute() {
		internalCommand.execute();
	}

	public abstract void executeTrigger();

	@Override
	public final void doRedo() {
		internalCommand.redo();
	}

	@Override
	public final void doUndo() {
		internalCommand.undo();
	}

	@Override
	/**
	 * Sobreescribir si se quiere evitar la ejecuci�n en determinados casos
	 */
	protected boolean prepare() {
		return true;
	}

	/**
	 * Devuelve true si solo tiene una referencia
	 * @param element
	 * @return
	 */
	protected boolean canRemove(EObject element) {
		return findReferencingElements(element).size() == 1;
	}

	/**
	 * Devuelve true si solo tiene una referencia
	 * @param element
	 * @return
	 */
	protected boolean canRename(EObject element) {
		return findReferencingElements(element).size() == 1;
	}

	private List<EObject> findReferencingElements(EObject element) {
		EClass elementType = GMFGraphPackage.eINSTANCE.getDiagramElement();

		if (element instanceof DiagramElement || element instanceof AbstractTool)
			elementType = GMFMapPackage.eINSTANCE.getMappingEntry();

		if (element instanceof DiagramLabel)
			elementType = GMFMapPackage.eINSTANCE.getLabelMapping();

		if (element instanceof Compartment)
			elementType = GMFMapPackage.eINSTANCE.getCompartmentMapping();

		if (element instanceof ChildAccess || element instanceof FigureDescriptor)
			elementType = GMFGraphPackage.eINSTANCE.getDiagramElement();

		return findReferencingElements(element, elementType);
	}

	private List<EObject> findReferencingElements(EObject element, EClass elementType) {
		List<EObject> referencingElements = new ArrayList<EObject>();

		for (Setting setting : EcoreUtil.UsageCrossReferencer.find(element, domain.getResourceSet()))
			if (elementType.isSuperTypeOf(setting.getEObject().eClass()) && !referencingElements.contains(setting.getEObject()))
				referencingElements.add(setting.getEObject());

		return referencingElements;
	}

	protected String getNewCanvasElementName(String baseName, Identity elementToRename) {
		String newName = baseName;

		int i = 2;

		while (nameCollides(elementToRename, newName))
			newName = newName + i++;

		return newName;
	}

	protected String getNewToolName(String baseName, AbstractTool toolToRename) {
		String newName = baseName;

		int i = 2;

		while (nameCollides(toolToRename, newName))
			newName = newName + i++;

		return newName;
	}

	protected boolean nameCollides(Identity myElement, String baseName) {
		EObject elementContainer = myElement.eContainer();

		for (EObject child : elementContainer.eContents())
			if (child instanceof Identity) {
				Identity element = (Identity) child;
				if (element != myElement && element.getName() != null && element.getName().equals(baseName))
					return true;
			}

		return false;
	}

	protected boolean nameCollides(AbstractTool myTool, String baseName) {
		List<AbstractTool> tools = ((ToolContainer) myTool.eContainer()).getTools();

		for (AbstractTool tool : tools)
			if (tool != myTool && tool.getTitle() != null && tool.getTitle().equals(baseName))
				return true;

		return false;
	}

}