/*****************************************************************************
 * 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.views.modelexplorer;

import java.util.ArrayList;
import java.util.Iterator;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.jface.viewers.ITreeSelection;
import org.eclipse.papyrus.infra.core.editor.IMultiDiagramEditor;
import org.eclipse.papyrus.infra.core.sasheditor.editor.ISashWindowsContainer;
import org.eclipse.papyrus.infra.core.ui.IRevealSemanticElement;
import org.eclipse.papyrus.infra.core.utils.EditorUtils;
import org.eclipse.papyrus.infra.core.utils.ServiceUtils;
import org.eclipse.ui.IEditorInput;
import org.eclipse.ui.IEditorPart;
import org.eclipse.ui.ISelectionService;
import org.eclipse.ui.IWorkbenchPage;
import org.eclipse.ui.navigator.ILinkHelper;
/**
 * This class is to link form the model explorer to diagram
 * This code was to not put in the model explorer in order to avoid dependences with gmf in the more abstract explorer
 *
 */

public class LinkHelper implements ILinkHelper {
	/**
	 * 
	 * @see org.eclipse.ui.navigator.ILinkHelper#findSelection(org.eclipse.ui.IEditorInput)
	 *
	 */
	public IStructuredSelection findSelection(IEditorInput anInput) {
		return null;
	}
	/**
	 * 
	 * @see org.eclipse.ui.navigator.ILinkHelper#activateEditor(org.eclipse.ui.IWorkbenchPage, org.eclipse.jface.viewers.IStructuredSelection)
	 *
	 */
	public void activateEditor(IWorkbenchPage aPage, IStructuredSelection aSelection) {
		//no selection
		if (aSelection == null || aSelection.isEmpty())
			return;
		ISelectionService selectService=aPage.getWorkbenchWindow().getSelectionService();
		ISelection selection=selectService.getSelection();

		//test if the selection come the tree viewer in order to avoid  cycle: Diagram -> tree-> diagram
		// if the diagram has been selected the selection is not a TreeSelection
		if( selection  instanceof ITreeSelection){
			IMultiDiagramEditor papyrusEditor=EditorUtils.getMultiDiagramEditor();

			
			try {
				ISashWindowsContainer windowsContainer=ServiceUtils.getInstance().getISashWindowsContainer(papyrusEditor.getServicesRegistry());

				Iterator<IEditorPart>iterPart=windowsContainer.getVisibleIEditorParts().iterator();

				while(iterPart.hasNext()){
					IEditorPart diagramEditor=iterPart.next();
					if (diagramEditor instanceof IRevealSemanticElement){
						if( aSelection instanceof IStructuredSelection){
							Iterator<?> selectionIterator=((IStructuredSelection)aSelection).iterator();
							ArrayList<Object> semanticElementList= new ArrayList<Object>();
							while(selectionIterator.hasNext()) {
								Object currentSelection = (Object)selectionIterator.next();
								if( currentSelection instanceof IAdaptable){
									Object semanticElement=((IAdaptable)currentSelection).getAdapter(EObject.class);
									if( semanticElement!=null){
										semanticElementList.add(semanticElement);
									}
								}

							}
							((IRevealSemanticElement)diagramEditor).revealSemanticElement(semanticElementList);
						}
					}
				}
			} catch (Exception e) {
				Activator.log.error("Impossible to acces to windows Container", e);
			}
		}
	}


}