EDIT

// $Id$

/**

* Copyright (C) 2017 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.e4;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Map;

import javax.annotation.PostConstruct;

import javax.inject.Inject;

import org.eclipse.e4.core.contexts.ContextInjectionFactory;

import org.eclipse.e4.core.contexts.IEclipseContext;

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

import org.eclipse.e4.ui.di.UIEventTopic;

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

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

import org.eclipse.jface.viewers.AbstractTreeViewer;

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.widgets.Composite;

import org.eclipse.swt.widgets.Tree;

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.name.TaxonName;

import eu.etaxonomy.cdm.model.occurrence.SpecimenOrObservationBase;

import eu.etaxonomy.taxeditor.bulkeditor.e4.BulkEditorE4;

import eu.etaxonomy.taxeditor.editor.ITaxonEditor;

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

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

import eu.etaxonomy.taxeditor.editor.view.concept.e4.ConceptViewPartE4;

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

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

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

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

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

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

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

import eu.etaxonomy.taxeditor.editor.view.media.e4.MediaViewPartE4;

import eu.etaxonomy.taxeditor.event.WorkbenchEventConstants;

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.session.ICdmEntitySession;

import eu.etaxonomy.taxeditor.session.ICdmEntitySessionEnabled;

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

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

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

import eu.etaxonomy.taxeditor.workbench.part.ICollapsableExpandable;

/**

 * @author pplitzner

 * @date 15.08.2017

 */

public class FactualDataPartE4 extends AbstractCdmEditorPartE4

        implements IPartContentHasDetails, IPartContentHasSupplementalData, ICdmEntitySessionEnabled,

        ICollapsableExpandable {

    /**

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

    private DescriptiveContentProvider provider;

    @PostConstruct

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

            IEclipseContext context) {

        TreeViewer treeViewer = new TreeViewer(new Tree(parent, SWT.H_SCROLL

                | SWT.V_SCROLL | SWT.FULL_SELECTION | SWT.MULTI));

        this.thisPart = thisPart;

        provider = new DescriptiveContentProvider(featureNodeContainerCache);

        treeViewer.setContentProvider(provider);

        treeViewer.setLabelProvider(new DescriptiveLabelProvider());

        treeViewer.setSorter(new DescriptiveViewerSorter());

        treeViewer.setFilters(new NameDescriptionFilter());

        treeViewer.setAutoExpandLevel(2);

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

        treeViewer.addDragSupport(dndOperations, transfers, new DescriptionElementDragListener(

                this));

        viewer = treeViewer;

        // Propagate selection from viewer

        selectionChangedListener = (event -> selService.setSelection(event.getSelection()));

        viewer.addSelectionChangedListener(selectionChangedListener);

        DescriptionElementDropAdapter dropListener = new DescriptionElementDropAdapter(viewer);

        ContextInjectionFactory.inject(dropListener, context);

        treeViewer.addDropSupport(dndOperations, transfers,

                dropListener);

        //create context menu

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

    }

    @Override

    public void selectionChanged_internal(Object selection, MPart activePart, MPart thisPart) {

        if(activePart==thisPart){

            return;

        }

        Object partObject = createPartObject(activePart);

        if ((partObject instanceof DetailsPartE4 && !(selection instanceof TaxonName))|| partObject instanceof SupplementalDataPartE4

                || partObject instanceof MediaViewPartE4 || partObject instanceof ConceptViewPartE4 || ((partObject instanceof AbstractCdmEditorPartE4) &&(((AbstractCdmEditorPartE4)partObject).getViewer().getInput() instanceof DescriptionElementBase))) {

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

            // description selected in this view

            return;

        }

        if(partObject instanceof IPartContentHasFactualData ){

            if (!viewer.getControl().isDisposed()){

                viewer.getControl().setEnabled(isEnabled());

            }

            IStructuredSelection structuredSelection = createSelection(selection);

            if(structuredSelection==null || structuredSelection.isEmpty()){

                showEmptyPage();

                return;

            }

            Object firstElement = structuredSelection.getFirstElement();

            if (partObject instanceof TaxonNameEditorE4){

                if (firstElement != ((TaxonNameEditorE4)partObject).getTaxon()){

                    showEmptyPage();

                    return;

                }

            }

            if(firstElement instanceof TreeNode){

                firstElement = ((TreeNode) firstElement).getValue();

            }

            if(firstElement instanceof IDescribable<?>

                && partObject instanceof IPartContentHasFactualData

                    && !(firstElement instanceof SpecimenOrObservationBase && partObject instanceof BulkEditorE4)){

                   // && !(firstElement instanceof TaxonName && partObject instanceof BulkEditorE4)){

                if (firstElement instanceof TaxonName ){

                    thisPart.setLabel(Messages.NameFactsDataView_Lable);

                }else{

                    thisPart.setLabel(Messages.FactualDataView_Lable);

                }

//                featureNodeContainerCache.clear();

                showViewer(structuredSelection, activePart, viewer);

                if ( viewer.getControl() != null &&!this.viewer.getControl().isDisposed()){

                    this.viewer.getControl().setEnabled(isEnabled());

                }

                return;

            }

        }

        showEmptyPage();

        return;

    }

    @Override

    protected String getViewName(){

        return Messages.DescriptiveViewPart_FACTUAL_DATA;

    }

    @Override

    public void changed(Object object) {

        Object[] expandedObjects = null;

        if (!viewer.getControl().isDisposed()){

            expandedObjects = ((TreeViewer)viewer).getExpandedElements();

        }else{

            return;

        }

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

            containerTree.buildTree();

        }

        viewer.refresh();

        super.changed(object);

        ((TreeViewer) viewer).setExpandedElements(expandedObjects);

        if(object instanceof DescriptionElementBase){

            DescriptionElementBase descriptionElement = (DescriptionElementBase) object;

            DescriptionBase description = descriptionElement.getInDescription();

            FeatureNodeContainerTree containerTree = featureNodeContainerCache.get(description);

            FeatureNodeContainer featureNodeContainer = containerTree.getFeatureNodeContainerForDescriptionElement(descriptionElement);

            ((AbstractTreeViewer) viewer).expandToLevel(featureNodeContainer, 2);

            StructuredSelection selection = new StructuredSelection(object);

            viewer.setSelection(selection, true);

        }

    }

    @Inject

    @Optional

    private void updateView(@UIEventTopic(WorkbenchEventConstants.SAVE_TAXON)boolean refresh){

        if(refresh){

            Object[] expandedObjects = ((TreeViewer)viewer).getExpandedElements();

            viewer.refresh();

            ((TreeViewer)viewer).collapseAll();

            if (expandedObjects.length>0){

                ((TreeViewer)viewer).setExpandedElements(expandedObjects);

            }

        }

    }

    @Inject

    @Optional

    private void updateView(@UIEventTopic(WorkbenchEventConstants.REFRESH_FACTS)Object element){

        Object[] expandedObjects = ((TreeViewer)viewer).getExpandedElements();

        viewer.refresh();

        ((TreeViewer)viewer).collapseAll();

        if (expandedObjects.length>0){

            ((TreeViewer)viewer).setExpandedElements(expandedObjects);

        }

        ((TreeViewer)viewer).setExpandedState(element, true);

    }

    @Inject

    @Optional

    private void updateView(@UIEventTopic(WorkbenchEventConstants.CURRENT_ACTIVE_EDITOR)ITaxonEditor editor){

        if(editor == null){

            featureNodeContainerCache.clear();

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void collapse() {

        if(viewer instanceof TreeViewer) {

            ((TreeViewer) viewer).collapseAll();

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void expand() {

        if(viewer instanceof TreeViewer) {

            ((TreeViewer) viewer).expandAll();

        }

    }

    public void toggleShowOnlyIndividualAssociations(){

        provider.toggleShowOnlyIndividualAssociations();

        viewer.refresh();

    }

    @Override

    public ICdmEntitySession getCdmEntitySession() {

        if(selectionProvidingPart != null && selectionProvidingPart instanceof ICdmEntitySessionEnabled) {

            return ((ICdmEntitySessionEnabled) selectionProvidingPart).getCdmEntitySession();

        }

        return null;

    }

    @Override

    public  List<? extends CdmBase> getRootEntities() {

        return Arrays.asList((CdmBase)getViewer().getInput());

    }

    @Override

    public Map<Object, List<String>> getPropertyPathsMap() {

        return null;

    }

    @Override

    protected void showViewer(IStructuredSelection selection, MPart activePart, Viewer viewer){

        Object[] expandedObjects = null;

        if (!((TreeViewer)this.getViewer()).getControl().isDisposed()){

            expandedObjects = ((TreeViewer)this.getViewer()).getExpandedElements();

        }

        super.showViewer(selection, activePart, viewer);

        if (expandedObjects == null || expandedObjects.length == 0){

            ((TreeViewer)this.viewer).expandToLevel(2);

        }else{

            ((TreeViewer)this.viewer).setExpandedElements(expandedObjects);

        }

    }

}