EDIT

// $Id$

/**

 * Copyright (C) 2007 EDIT

 * European Distributed Institute of Taxonomy

 * http://www.e-taxonomy.eu

 *

 * The contents of this file are subject to the Mozilla Public License Version 1.1

 * See LICENSE.TXT at the top of this package for the full license terms.

 */

package eu.etaxonomy.taxeditor.editor.view.descriptive.handler;

import org.eclipse.jface.action.ContributionItem;

import org.eclipse.jface.action.IContributionItem;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.swt.events.SelectionEvent;

import org.eclipse.swt.events.SelectionListener;

import org.eclipse.swt.widgets.Event;

import org.eclipse.swt.widgets.Menu;

import org.eclipse.swt.widgets.MenuItem;

import org.eclipse.ui.ISelectionService;

import org.eclipse.ui.actions.CompoundContributionItem;

import org.eclipse.ui.handlers.IHandlerService;

import eu.etaxonomy.cdm.hibernate.HibernateProxyHelper;

import eu.etaxonomy.cdm.model.description.DescriptionBase;

import eu.etaxonomy.cdm.model.description.DescriptionElementBase;

import eu.etaxonomy.cdm.model.description.Feature;

import eu.etaxonomy.cdm.model.description.FeatureNode;

import eu.etaxonomy.cdm.model.description.FeatureTree;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.editor.view.descriptive.DescriptiveViewPart;

import eu.etaxonomy.taxeditor.editor.view.descriptive.operation.CreateDescriptionElementOperation;

import eu.etaxonomy.taxeditor.model.FeatureNodeContainer;

import eu.etaxonomy.taxeditor.model.MessagingUtils;

import eu.etaxonomy.taxeditor.preference.PreferencesUtil;

import eu.etaxonomy.taxeditor.store.CdmStore;

/**

 * <p>

 * DynamicFeatureMenu class.

 * </p>

 *

 * @author n.hoffmann

 * @created 17.04.2009

 * @version 1.0

 */

public class DynamicFeatureMenu extends CompoundContributionItem {

	private final ISelectionService selectionService = EditorUtil.getActivePart()

			.getSite().getWorkbenchWindow().getSelectionService();

	private final IHandlerService handlerService = (IHandlerService) EditorUtil

			.getService(IHandlerService.class);

	/*

	 * (non-Javadoc)

	 *

	 * @see

	 * org.eclipse.ui.actions.CompoundContributionItem#getContributionItems()

	 */

	/** {@inheritDoc} */

	@Override

	protected IContributionItem[] getContributionItems() {

		return new IContributionItem[] { new ContributionItem() {

			@Override

            public void fill(Menu menu, int index) {

				ISelection selection = selectionService

						.getSelection(DescriptiveViewPart.ID);

				if (selection instanceof IStructuredSelection) {

					IStructuredSelection structuredSelection = (IStructuredSelection) selection;

					Object selectedElement = structuredSelection

							.getFirstElement();

					if (selectedElement instanceof DescriptionBase<?>) {

						FeatureTree featureTree = getFeatureTree((DescriptionBase<?>) selectedElement);

						for (FeatureNode childNode : featureTree.getRootChildren()) {

							createMenuItem(menu, childNode.getFeature());

						}

					} else if (selectedElement instanceof FeatureNodeContainer) {

						FeatureNode featureNode = ((FeatureNodeContainer) selectedElement)

								.getFeatureNode();

						// add the feature to the menu

						createMenuItem(menu, featureNode.getFeature());

						// add possible children to the menu

						for (FeatureNode childNode : featureNode.getChildNodes()) {

							createMenuItem(menu, childNode.getFeature());

						}

					} else if (selectedElement instanceof DescriptionElementBase) {

						Feature feature = ((DescriptionElementBase) selectedElement)

								.getFeature();

						createMenuItem(menu, feature);

					}

				}

			}

		} };

	}

	private void createMenuItem(Menu menu, final Feature feature) {

		MenuItem menuItem = new MenuItem(menu, -1);

		final Feature deproxiedFeature = (Feature) HibernateProxyHelper

				.deproxy(feature);

		menuItem.setText(deproxiedFeature.getLabel());

		menuItem.addSelectionListener(new SelectionListener() {

			@Override

            public void widgetDefaultSelected(SelectionEvent e) {

			}

			@Override

            public void widgetSelected(SelectionEvent ev) {

				Event event = new Event();

				event.data = deproxiedFeature;

				try {

					handlerService.executeCommand(

							CreateDescriptionElementOperation.ID, event);

				} catch (Exception e) {

					MessagingUtils.error(getClass(), e);

				}

			}

		});

	}

	/**

	 * Retrieves the feature tree associated with the given description

	 *

	 * TODO as of now this is always the same thing because feature trees may

	 * not be associated to descriptions yet.

	 *

	 * @param description

	 * @return

	 */

	private FeatureTree getFeatureTree(DescriptionBase description) {

		FeatureTree featureTree = null;

		// TODO change this to the feature tree associated with this taxon

		// description

		if (description.hasStructuredData()) {

			featureTree = PreferencesUtil

					.getDefaultFeatureTreeForStructuredDescription();

		} else {

			featureTree = PreferencesUtil

					.getDefaultFeatureTreeForTextualDescription();

		}

		if (featureTree == null) {

			featureTree = FeatureTree.NewInstance(CdmStore.getTermManager()

					.getPreferredTerms(Feature.class));

		}

		return featureTree;

	}

}