/*****************************************************************************
 * Copyright (c) 2011 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:
 *  Vincent Lorenzo (CEA LIST) vincent.lorenzo@cea.fr - Initial API and implementation
 *
 *****************************************************************************/
package org.eclipse.papyrus.views.modelexplorer.handler;

import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;

import org.eclipse.core.commands.ExecutionEvent;
import org.eclipse.core.commands.ExecutionException;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExecutableExtension;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.IStructuredSelection;
import org.eclipse.papyrus.infra.core.sasheditor.contentprovider.IPageMngr;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.handlers.HandlerUtil;

/**
 * This handler allows to Open Diagrams and Tables
 * 
 * 
 * 
 */
public class OpenHandler extends AbstractModelExplorerHandler implements IExecutableExtension {


	/**
	 * Close only the selected elements
	 */
	public static final String IS_DUPLICATE_EDITOR_ALLOWED_PARAMETER = "isDuplicateEditorAllowed"; //$NON-NLS-1$


	/**
	 * Return true if the open command allow to duplicate editor that are already
	 * opened.
	 * Return false if open command should not duplicate already opened editor.
	 * This property can be set from the plugin.xml.
	 */
	protected boolean isDuplicateDiagramAllowed = false;


	/**
	 * 
	 * @see org.eclipse.core.commands.AbstractHandler#execute(org.eclipse.core.commands.ExecutionEvent)
	 * 
	 * @param event
	 * @return
	 * @throws ExecutionException
	 */
	public Object execute(ExecutionEvent event) throws ExecutionException {
		IPageMngr pageMngr = getPageManager();
		if(pageMngr == null) {
			return null;
		}
		
		// Try to close each selected editor.
		// There is no common type for object representing an editor. So,
		// We try to get the EObject, and try to close it as an Editor.
		List<EObject> selectedProperties = getCurrentSelectionAdaptedToType( event, EObject.class );
		if( selectedProperties == null) {
			// nothing to do
			return null;
		}
		
		// Check each selected object
		for( EObject selected : selectedProperties) {
			
			if( isDuplicateDiagramAllowed || !pageMngr.isOpen(selected) ) {
				pageMngr.openPage(selected);
			}
		}

		return null;

	}

	/**
	 * 
	 * @see org.eclipse.core.commands.AbstractHandler#isEnabled()
	 * 
	 * @return
	 */
//	@Override
//	public boolean isEnabled() {
//		IPageMngr pageMngr = getPageManager();
//		if(pageMngr == null) {
//			return false;
//		}
//		
//		// Try to close each selected editor.
//		// There is no common type for object representing an editor. So,
//		// We try to get the EObject, and try to close it as an Editor.
//		List<EObject> selectedProperties = getCurrentSelectionAdaptedToType( event, EObject.class );
//		if( selectedProperties == null) {
//			// nothing to do
//			return false;
//		}
//		
//		// Check each selected object
//		// Return true if one of them is enabled
//		for( EObject selected : selectedProperties) {
//			
//			if( isDuplicateDiagramAllowed || !pageMngr.isOpen(selected) ) {
//				return true;
//			}
//		}
//		
//		
//		return false;
//	}

	/**
	 * 
	 * @see org.eclipse.core.runtime.IExecutableExtension#setInitializationData(org.eclipse.core.runtime.IConfigurationElement, java.lang.String,
	 *      java.lang.Object)
	 * 
	 * @param config
	 * @param propertyName
	 * @param data
	 * @throws CoreException
	 */
	public void setInitializationData(IConfigurationElement config, String propertyName, Object data) throws CoreException {
		if( ! (data instanceof Hashtable) ) {
			return;
		}
		
		@SuppressWarnings("rawtypes")
		Hashtable map = (Hashtable)data;
		
		try {
			isDuplicateDiagramAllowed = Boolean.parseBoolean((String)map.get(IS_DUPLICATE_EDITOR_ALLOWED_PARAMETER) );
		} catch (Exception e) {
			// silently fail;
		}
	}


}