EDIT

/**

 *

 */

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

import java.util.Iterator;

import javax.inject.Named;

import org.eclipse.core.runtime.IStatus;

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

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

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

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

import org.eclipse.e4.ui.model.application.ui.menu.MHandledMenuItem;

import org.eclipse.e4.ui.model.application.ui.menu.MMenuItem;

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

import org.eclipse.jface.dialogs.MessageDialog;

import org.eclipse.jface.viewers.ISelection;

import org.eclipse.jface.viewers.TreePath;

import org.eclipse.jface.viewers.TreeSelection;

import org.eclipse.swt.widgets.Shell;

import eu.etaxonomy.cdm.api.service.config.MediaDeletionConfigurator;

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

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

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

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

import eu.etaxonomy.cdm.model.media.Media;

import eu.etaxonomy.taxeditor.editor.EditorUtil;

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

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

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

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

import eu.etaxonomy.taxeditor.editor.view.media.operation.DeleteMediaOperation;

import eu.etaxonomy.taxeditor.model.AbstractUtility;

import eu.etaxonomy.taxeditor.operation.AbstractPostOperation;

import eu.etaxonomy.taxeditor.ui.dialog.configurator.deleteConfigurator.DeleteConfiguratorDialog;

/**

 *

 * @author pplitzner

 * @since Aug 15, 2017

 *

 */

public class DeleteMediaHandler  {

    @Execute

    public void execute(@Named(IServiceConstants.ACTIVE_PART) MPart activePart,

            @Named(IServiceConstants.ACTIVE_SHELL)Shell shell,

            MMenuItem menuItem,

            UISynchronize sync) {

        MediaViewPartE4 mediaView = (MediaViewPartE4) activePart.getObject();

        TreeSelection selection = (TreeSelection) mediaView.getViewer().getSelection();

        for(Iterator iter = selection.iterator();iter.hasNext();){

            Object object = iter.next();

            TreePath[] paths = selection.getPaths();

            int count = paths[0].getSegmentCount();

            DescriptionBase description = null;

            for (int i = 0; i < count; i++ ) {

                if (paths[0].getSegment(i) instanceof DescriptionBase) {

                    description = (DescriptionBase) paths[0].getSegment(i);

                    break;

                }

            }

            // TODO use undo context specific to editor

            MediaDeletionConfigurator config = new MediaDeletionConfigurator();

            config.setDeleteFromDescription(true);

            config.setOnlyRemoveFromGallery(false);

            if (description instanceof SpecimenDescription){

                config.setDeleteFrom(((SpecimenDescription)description).getDescribedSpecimenOrObservation());

            } else if (description instanceof TaxonDescription){

                config.setDeleteFrom(((TaxonDescription)description).getTaxon());

            }else if (description instanceof TaxonNameDescription){

                config.setDeleteFrom(((TaxonNameDescription)description).getTaxonName());

            }

            DeleteConfiguratorDialog dialog;

            dialog = new DeleteConfiguratorDialog(config, shell, Messages.DeleteMediaHandler_CONFIRM,  null,  Messages.DeleteMediaHandler_CONFIRM_MESSAGE, MessageDialog.WARNING, new String[] { Messages.DeleteMediaHandler_DELETE, Messages.DeleteMediaHandler_SKIP }, 0);

            int result_dialog= dialog.open();

            if (result_dialog != IStatus.OK){

                return;

            }

            if(object instanceof Media){

                AbstractPostOperation<?> operation = new DeleteMediaOperation(menuItem.getLocalizedLabel(), EditorUtil.getUndoContext(), description, (Media) object, config, mediaView);

                AbstractUtility.executeOperation(operation, sync);

            }

            if(object instanceof DescriptionBase && ((DescriptionBase) object).isImageGallery()){

                if(object instanceof TaxonDescription){

                    DeleteTaxonDescriptionOperation deleteTaxonDescriptionOperation = new DeleteTaxonDescriptionOperation(menuItem.getLocalizedLabel(), EditorUtil.getUndoContext(), (TaxonDescription)object, mediaView, null);

                    AbstractUtility.executeOperation(deleteTaxonDescriptionOperation, sync);

                }

                else if(object instanceof SpecimenDescription){

                    DeleteSpecimenDescriptionOperation deleteTaxonDescriptionOperation = new DeleteSpecimenDescriptionOperation(menuItem.getLocalizedLabel(), EditorUtil.getUndoContext(), (SpecimenDescription)object, mediaView, null);

                    AbstractUtility.executeOperation(deleteTaxonDescriptionOperation, sync);

                }

            }

        }

    }

    @CanExecute

    public boolean canExecute(@Named(IServiceConstants.ACTIVE_PART) MPart activePart,

            MHandledMenuItem menuItem){

        MediaViewPartE4 mediaView = (MediaViewPartE4) activePart.getObject();

        ISelection selection = mediaView.getViewer().getSelection();

        boolean canExecute = selection instanceof TreeSelection && !selection.isEmpty();

        for(Iterator iter = ((TreeSelection) selection).iterator();iter.hasNext();){

            Object object = iter.next();

            canExecute &= object instanceof Media

                    || (object instanceof DescriptionBase && ((DescriptionBase) object).isImageGallery());

        }

        menuItem.setVisible(canExecute);

        return canExecute;

    }

}