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;

import java.util.HashMap;

import java.util.Map;

import org.eclipse.jface.action.Action;

import org.eclipse.jface.action.GroupMarker;

import org.eclipse.jface.action.IAction;

import org.eclipse.jface.action.IToolBarManager;

import org.eclipse.jface.action.MenuManager;

import org.eclipse.jface.resource.ImageDescriptor;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.ITreeContentProvider;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.viewers.TreeNode;

import org.eclipse.jface.viewers.TreeViewer;

import org.eclipse.jface.viewers.Viewer;

import org.eclipse.swt.SWT;

import org.eclipse.swt.dnd.DND;

import org.eclipse.swt.dnd.Transfer;

import org.eclipse.swt.graphics.ImageData;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.swt.widgets.Control;

import org.eclipse.swt.widgets.Menu;

import org.eclipse.swt.widgets.Tree;

import org.eclipse.ui.IWorkbenchActionConstants;

import org.eclipse.ui.IWorkbenchPart;

import eu.etaxonomy.cdm.model.common.CdmBase;

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

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

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

import eu.etaxonomy.cdm.model.taxon.Taxon;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.editor.view.checklist.ChecklistEditor;

import eu.etaxonomy.taxeditor.editor.view.derivate.DerivateView;

import eu.etaxonomy.taxeditor.model.AbstractUtility;

import eu.etaxonomy.taxeditor.model.FeatureNodeContainer;

import eu.etaxonomy.taxeditor.model.FeatureNodeContainerTree;

import eu.etaxonomy.taxeditor.model.IPartContentHasDetails;

import eu.etaxonomy.taxeditor.model.IPartContentHasFactualData;

import eu.etaxonomy.taxeditor.model.IPartContentHasSupplementalData;

import eu.etaxonomy.taxeditor.model.ImageResources;

import eu.etaxonomy.taxeditor.view.AbstractCdmEditorViewPart;

import eu.etaxonomy.taxeditor.view.detail.DetailsViewPart;

import eu.etaxonomy.taxeditor.view.supplementaldata.SupplementalDataViewPart;

/**

 * <p>DescriptiveViewPart class.</p>

 *

 * @author n.hoffmann

 * @created Jun 9, 2010

 * @version 1.0

 */

public class DescriptiveViewPart extends AbstractCdmEditorViewPart implements IPartContentHasDetails, IPartContentHasSupplementalData {

	/** Constant <code>ID="eu.etaxonomy.taxeditor.editor.view.desc"{trunked}</code> */

	public static final String ID = "eu.etaxonomy.taxeditor.editor.view.descriptive";

	protected TreeViewer viewer;

	/**

	 * Maps {@link FeatureNodeContainerTree} to their corresponding {@link TaxonDescritpion}.<br>

	 * This serves as input for the {@link ITreeContentProvider} of the {@link TreeViewer}

	 */

	protected Map<DescriptionBase<?>, FeatureNodeContainerTree> featureNodeContainerCache = new HashMap<DescriptionBase<?>, FeatureNodeContainerTree>();

	protected ToggleDescriptionAction showAllElementsAction;

	protected ToggleDescriptionAction hideAllElementsAction;

	protected int dndOperations = DND.DROP_COPY | DND.DROP_MOVE;

	/** {@inheritDoc} */

	@Override

	public void createViewer(Composite parent) {

		viewer = new TreeViewer(new Tree(parent, SWT.MULTI | SWT.H_SCROLL

				| SWT.V_SCROLL | SWT.FULL_SELECTION));

		viewer.setContentProvider(new DescriptiveContentProvider(featureNodeContainerCache));

		viewer.setLabelProvider(new DescriptiveLabelProvider());

		viewer.setSorter(new DescriptiveViewerSorter());

		viewer.setAutoExpandLevel(2);

		Transfer[] transfers = new Transfer[] { DescriptionElementTransfer.getInstance() };

		viewer.addDragSupport(dndOperations, transfers, new DescriptionElementDragListener(

				this));

		viewer.addDropSupport(dndOperations, transfers,

				new DescriptionElementDropAdapter(viewer));

		// Propagate selection from viewer

		getSite().setSelectionProvider(viewer);

		showAllElementsAction = new ToggleDescriptionAction(false);

		hideAllElementsAction = new ToggleDescriptionAction(true);

		// Add context menu to tree

		createMenu();

		createToolbar();

		// set initial input

//		if(getEditor() != null){

//			viewer.setInput(getEditor().getEditorInput());

//		}

	}

	/* (non-Javadoc)

	 * @see eu.etaxonomy.taxeditor.model.AbstractCdmViewPart#getInitialSelection()

	 */

	/** {@inheritDoc} */

	@Override

	protected ISelection getInitialSelection() {

		if(getEditor() != null){

			return new StructuredSelection(getEditor().getEditorInput());

		}

		return super.getInitialSelection();

	}

	protected void createToolbar() {

		IToolBarManager toolBarManager = getViewSite().getActionBars().getToolBarManager();

		toolBarManager.add(showAllElementsAction);

		toolBarManager.add(hideAllElementsAction);

	}

	/*

	 * TODO add to the views menu

	 */

	protected void createMenu(){

		MenuManager menuManager = new MenuManager();

		menuManager.add(new GroupMarker(IWorkbenchActionConstants.MB_ADDITIONS));

		getSite().registerContextMenu(menuManager, viewer);

		// FIXME for some reason this is not working

		menuManager.add(showAllElementsAction);

		menuManager.add(hideAllElementsAction);

		Control control = viewer.getControl();

		Menu menu = menuManager.createContextMenu(control);

		control.setMenu(menu);

	}

	/** {@inheritDoc} */

	@Override

    protected void selectionChanged_internal(IWorkbenchPart part, ISelection selection) {

		if(AbstractUtility.getActiveEditor() == null){

			showEmptyPage();

			return;

		}

		if(part == this){

		    return;

		}

		if(part instanceof DetailsViewPart || part instanceof SupplementalDataViewPart){

		    // do not show empty page as these views are also used to edit the description selected in this view

		    return;

		}

		// unpackage TreeNode of DerivateView

		else if(part instanceof DerivateView){

		    TreeNode treeNodeOfSelection = EditorUtil.getTreeNodeOfSelection(selection);

		    if(treeNodeOfSelection!=null){

		        selection = new StructuredSelection(treeNodeOfSelection.getValue());

		    }

		}

        else if(part instanceof ChecklistEditor){

            if(selection instanceof StructuredSelection  && ((IStructuredSelection) selection).getFirstElement() instanceof Taxon){

                Taxon taxon = (Taxon)((IStructuredSelection) selection).getFirstElement();

                selection = new StructuredSelection(taxon);

            }

        }

		if(selection instanceof IStructuredSelection

		        && ((IStructuredSelection) selection).getFirstElement() instanceof IDescribable<?>

		        && part instanceof IPartContentHasFactualData){

		    featureNodeContainerCache.clear();

		    showViewer(part, (IStructuredSelection) selection);

		    return;

		}

		else{

		    showEmptyPage();

		}

	}

	/**

	 *

	 * @author n.hoffmann

	 * @created May 28, 2010

	 * @version 1.0

	 */

	protected class ToggleDescriptionAction extends Action{

		private final boolean expanded;

		public ToggleDescriptionAction(boolean expand){

			super(null, IAction.AS_PUSH_BUTTON);

			expanded = expand;

			setImageAndTooltip();

		}

		private void setImageAndTooltip(){

			setImageDescriptor(new ImageDescriptor() {

				@Override

				public ImageData getImageData() {

					setText(expanded ? "Collapse All" : "Expand All");

					String resource = expanded ? ImageResources.COLLAPSE_ALL : ImageResources.EXPAND_ALL;

					return ImageResources.getImage(resource).getImageData();

				}

			});

			String toolTipText = expanded ? "Collapse all" : "Show all factual data";

			setToolTipText(toolTipText);

		}

		@Override

		public void run() {

			if(expanded){

				viewer.collapseAll();

			}else{

				viewer.expandAll();

			}

			setImageAndTooltip();

		}

	}

	/** {@inheritDoc} */

	@Override

	public boolean postOperation(CdmBase objectAffectedByOperation) {

		return super.postOperation(objectAffectedByOperation);

	}

	/** {@inheritDoc} */

	@Override

	public void changed(Object object) {

		for(FeatureNodeContainerTree containerTree : featureNodeContainerCache.values()){

			containerTree.buildTree();

		}

		viewer.refresh();

		if(object instanceof DescriptionElementBase){

			DescriptionElementBase descriptionElement = (DescriptionElementBase) object;

			DescriptionBase description = descriptionElement.getInDescription();

			FeatureNodeContainerTree containerTree = featureNodeContainerCache.get(description);

			FeatureNodeContainer featureNodeContainer = containerTree.getFeatureNodeContainerForDescriptionElement(descriptionElement);

			viewer.expandToLevel(featureNodeContainer, 1);

		}

		if(object != null){

			StructuredSelection selection = new StructuredSelection(object);

			viewer.setSelection(selection, true);

		}

		super.changed(object);

	}

	/** {@inheritDoc} */

	@Override

	public Viewer getViewer() {

		return viewer;

	}

	/**

	 * <p>onComplete</p>

	 *

	 * @return a boolean.

	 */

	@Override

    public boolean onComplete() {

		return false;

	}

}