EDIT

/**

* 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.concept.e4;

import java.util.Map.Entry;

import javax.annotation.PostConstruct;

import javax.inject.Inject;

import javax.inject.Named;

import org.eclipse.e4.core.di.annotations.Optional;

import org.eclipse.e4.ui.model.application.ui.basic.MPart;

import org.eclipse.e4.ui.services.EMenuService;

import org.eclipse.e4.ui.services.IServiceConstants;

import org.eclipse.e4.ui.workbench.modeling.ESelectionService;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.ListViewer;

import org.eclipse.jface.viewers.StructuredSelection;

import org.eclipse.jface.viewers.ViewerSorter;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.ui.IEditorInput;

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

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

import eu.etaxonomy.taxeditor.bulkeditor.BulkEditor;

import eu.etaxonomy.taxeditor.editor.key.AbstractGraphKeyEditor;

import eu.etaxonomy.taxeditor.editor.l10n.Messages;

import eu.etaxonomy.taxeditor.editor.name.e4.TaxonNameEditorE4;

import eu.etaxonomy.taxeditor.editor.view.concept.ConceptContentProvider;

import eu.etaxonomy.taxeditor.editor.view.concept.ConceptLabelProvider;

import eu.etaxonomy.taxeditor.model.AbstractUtility;

import eu.etaxonomy.taxeditor.model.IPartContentHasDetails;

import eu.etaxonomy.taxeditor.model.IPartContentHasSupplementalData;

import eu.etaxonomy.taxeditor.model.LineSelection;

import eu.etaxonomy.taxeditor.view.e4.AbstractCdmEditorPartE4;

import eu.etaxonomy.taxeditor.view.e4.details.DetailsPartE4;

import eu.etaxonomy.taxeditor.view.e4.supplementaldata.SupplementalDataPartE4;

/**

 *

 * @author pplitzner

 * @date 21.08.2017

 *

 */

public class ConceptViewPartE4 extends AbstractCdmEditorPartE4

implements IPartContentHasDetails, IPartContentHasSupplementalData{

    private ISelectionChangedListener selectionChangedListener;

    @Inject

    private ESelectionService selService;

    @Inject

    @Optional

    public void selectionChanged(

            @Named(IServiceConstants.ACTIVE_SELECTION)Object selection,

            @Named(IServiceConstants.ACTIVE_PART)MPart activePart,

            MPart thisPart){

        if(activePart==thisPart){

            return;

        }

        Object partObject = createPartObject(activePart);

        if (partObject instanceof DetailsPartE4 || partObject instanceof SupplementalDataPartE4) {

            // do not show empty page as these views are also used to edit the

            // description selected in this view

            return;

        }

        else if(partObject instanceof BulkEditor && selection instanceof LineSelection){

			if(((LineSelection) selection).getFirstElement() instanceof Taxon){

				showViewer((LineSelection) selection, activePart, viewer);

			}

			else{

				showEmptyPage();

			}

			return;

		}

		else if(partObject instanceof AbstractGraphKeyEditor){

			showEmptyPage();

		}

		else if(partObject instanceof TaxonNameEditorE4){

		    IEditorInput input = ((TaxonNameEditorE4) partObject).getEditorInput();

		    if(input!=null){

		        showViewer(new StructuredSelection(input), activePart, viewer);

		    }

		}

		else {

		    showEmptyPage();

		}

	}

	@PostConstruct

    public void create(Composite parent, EMenuService menuService, MPart thisPart) {

	    this.thisPart = thisPart;

	    ConceptRelationViewer conceptViewer = new ConceptRelationViewer(parent);

	    conceptViewer.setContentProvider(new ConceptContentProvider());

	    conceptViewer.setLabelProvider(new ConceptLabelProvider());

	    conceptViewer.setSorter(new ViewerSorter());

		viewer = conceptViewer;

		// Propagate selection from viewer

        selectionChangedListener = (event -> selService.setSelection(AbstractUtility.getElementsFromSelectionChangedEvent(event)));

        viewer.addSelectionChangedListener(selectionChangedListener);

        //create context menu

        menuService.registerContextMenu(viewer.getControl(), "eu.etaxonomy.taxeditor.editor.popupmenu.conceptview");

	}

	@Override

	public void changed(Object object) {

		getViewer().refresh();

		super.changed(object);

	}

	private class ConceptRelationViewer extends ListViewer {

		public ConceptRelationViewer(Composite parent) {

			super(parent);

		}

		@Override

		public ISelection getSelection() {

			ISelection selection = super.getSelection();

			if(selection instanceof IStructuredSelection && !selection.isEmpty()){

				Object firstElement = ((IStructuredSelection) selection).getFirstElement();

				TaxonRelationship taxonRelationship = ((Entry<TaxonRelationship, Taxon>)firstElement).getKey();

				return new StructuredSelection(taxonRelationship);

			}

			return selection;

		}

		@Override

		public void setSelection(ISelection selection) {

			super.setSelection(selection);

		}

	}

	@Override

	protected String getViewName() {

		return Messages.ConceptViewPart_VIEWER_NAME;

	}

}