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.descriptiveDataSet;

import java.util.Collection;

import java.util.List;

import java.util.Map;

import javax.annotation.PostConstruct;

import javax.annotation.PreDestroy;

import javax.inject.Inject;

import org.eclipse.core.runtime.IProgressMonitor;

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

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

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

import org.eclipse.e4.ui.model.application.MApplication;

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

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

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

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

import org.eclipse.jface.viewers.ArrayContentProvider;

import org.eclipse.jface.viewers.DoubleClickEvent;

import org.eclipse.jface.viewers.IDoubleClickListener;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.ISelectionChangedListener;

import org.eclipse.jface.viewers.IStructuredSelection;

import org.eclipse.jface.viewers.LabelProvider;

import org.eclipse.jface.viewers.ListViewer;

import org.eclipse.swt.widgets.Composite;

import org.eclipse.ui.IMemento;

import eu.etaxonomy.cdm.api.conversation.ConversationHolder;

import eu.etaxonomy.cdm.api.conversation.IConversationEnabled;

import eu.etaxonomy.cdm.api.service.IDescriptiveDataSetService;

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

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

import eu.etaxonomy.cdm.persistence.hibernate.CdmDataChangeMap;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

import eu.etaxonomy.taxeditor.event.WorkbenchEventConstants;

import eu.etaxonomy.taxeditor.model.IContextListener;

import eu.etaxonomy.taxeditor.session.ICdmEntitySession;

import eu.etaxonomy.taxeditor.session.ICdmEntitySessionEnabled;

import eu.etaxonomy.taxeditor.store.CdmStore;

/**

 * @author pplitzner

 * @date 12.12.2017

 *

 */

public class DescriptiveDataSetNavigator implements IConversationEnabled, ICdmEntitySessionEnabled, IContextListener{

    private ListViewer viewer;

    @Inject

    private ESelectionService selService;

    private ISelectionChangedListener selectionChangedListener;

    private ConversationHolder conversation;

    private ICdmEntitySession cdmEntitySession;

    private List<DescriptiveDataSet> descriptiveDataSets;

    public DescriptiveDataSetNavigator() {

        CdmStore.getContextManager().addContextListener(this);

    }

    @PostConstruct

    public void create(Composite parent, EPartService partService, EModelService modelService, MApplication application,

            EMenuService menuService){

        viewer = new ListViewer(parent);

        viewer.setContentProvider(new ArrayContentProvider());

        viewer.setLabelProvider(new LabelProvider(){

            /**

             * {@inheritDoc}

             */

            @Override

            public String getText(Object element) {

                if(element instanceof DescriptiveDataSet){

                    return ((DescriptiveDataSet) element).getLabel();

                }

                return super.getText(element);

            }

        });

        viewer.addDoubleClickListener(new IDoubleClickListener() {

            @Override

            public void doubleClick(DoubleClickEvent event) {

                ISelection selection = event.getSelection();

                if(selection instanceof IStructuredSelection){

                	DescriptiveDataSet descriptiveDataSetUuid = (DescriptiveDataSet) ((IStructuredSelection) selection).getFirstElement();

                	if(descriptiveDataSetUuid!=null){

                	    EditorUtil.openDescriptiveDataSetEditor(descriptiveDataSetUuid.getUuid(), modelService, partService, application);

                	}

                }

            }

        });

        //propagate selection

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

       viewer.addSelectionChangedListener(selectionChangedListener);

        //create context menu

        menuService.registerContextMenu(viewer.getControl(), "eu.etaxonomy.taxeditor.editor.popupmenu.descriptiveDataSetNavigator"); //$NON-NLS-1$

        init();

    }

    public void init(){

        if (CdmStore.isActive()){

            if(conversation == null) {

                conversation = CdmStore.createConversation();

            }

            if(cdmEntitySession == null){

                cdmEntitySession = CdmStore.getCurrentSessionManager().newSession(this, true);

            }

            descriptiveDataSets = CdmStore.getService(IDescriptiveDataSetService.class).list(DescriptiveDataSet.class, null, null, null, null);

            viewer.setInput(descriptiveDataSets);

        }

    }

    public void addDescriptiveDataSet(DescriptiveDataSet descriptiveDataSetSet){

        descriptiveDataSets.add(descriptiveDataSetSet);

        refresh();

    }

    public void removeDescriptiveDataSet(DescriptiveDataSet descriptiveDataSetSet){

        descriptiveDataSets.remove(descriptiveDataSetSet);

        refresh();

    }

    public void refresh(){

        refresh(false);

    }

    public void refresh(boolean reloadDescriptiveDataSets){

        if(reloadDescriptiveDataSets){

            cdmEntitySession.dispose();

            cdmEntitySession = CdmStore.getCurrentSessionManager().newSession(this, true);

            IDescriptiveDataSetService service = CdmStore.getService(IDescriptiveDataSetService.class);

            descriptiveDataSets = service.list(DescriptiveDataSet.class, null, null, null, null);

        }

        viewer.setInput(descriptiveDataSets);

        viewer.refresh();

    }

    @Inject

    @Optional

    private void updateView(@UIEventTopic(WorkbenchEventConstants.REFRESH_DATASET_NAVIGATOR) DescriptiveDataSet dataSet) {

        DescriptiveDataSet load = cdmEntitySession.load(dataSet, true);

        viewer.update(load, null);

        refresh();

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void update(CdmDataChangeMap arg0) {

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public ICdmEntitySession getCdmEntitySession() {

        return cdmEntitySession;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public <T extends CdmBase> Collection<T> getRootEntities() {

        return null;

    }

    /**

     * {@inheritDoc}

     */

    @Override

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

        return null;

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public ConversationHolder getConversationHolder() {

        return conversation;

    }

    public ESelectionService getSelService() {

        return selService;

    }

    @PreDestroy

    public void dispose() {

        if (conversation != null) {

            conversation.close();

            conversation = null;

        }

        if(cdmEntitySession != null) {

            cdmEntitySession.dispose();

            cdmEntitySession = null;

        }

    }

    @Focus

    public void setFocus() {

        if (getConversationHolder() != null) {

            getConversationHolder().bind();

        }

        if(cdmEntitySession != null) {

            cdmEntitySession.bind();

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void contextAboutToStop(IMemento memento, IProgressMonitor monitor) {

        // TODO Auto-generated method stub

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void contextStop(IMemento memento, IProgressMonitor monitor) {

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void contextStart(IMemento memento, IProgressMonitor monitor) {

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

            init();

        }

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void contextRefresh(IProgressMonitor monitor) {

    }

    /**

     * {@inheritDoc}

     */

    @Override

    public void workbenchShutdown(IMemento memento, IProgressMonitor monitor) {

    }

}