package org.simantics.district.selection.ui.handlers;

import javax.inject.Inject;

import org.eclipse.e4.core.contexts.IEclipseContext;
import org.eclipse.e4.core.di.annotations.CanExecute;
import org.eclipse.e4.core.di.annotations.Execute;
import org.eclipse.e4.ui.model.application.ui.basic.MPart;
import org.eclipse.e4.ui.workbench.IWorkbench;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.simantics.Simantics;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.district.selection.ElementSelector;
import org.simantics.district.selection.ui.parts.ElementSelectionView;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class DeleteElementSelector {

	@SuppressWarnings("unused")
	private static final Logger LOGGER = LoggerFactory.getLogger(DeleteElementSelector.class);

	@Inject
	EPartService partService;
	
	@CanExecute
	public boolean canExecute(ESelectionService selectionService) {
		MPart part = partService.getActivePart();
		if (part == null) return false;
		
		Object object = part.getObject();
		if (object == null || !(object instanceof ElementSelectionView))
			return false;
		
		ElementSelectionView view = (ElementSelectionView)object;
		return view.getSelectedItem() != null;
	}

	@Execute
	public void editElementSelector(IEclipseContext context, IWorkbench workbench) {
		MPart part = partService.getActivePart();
		if (part == null) return;
		
		Object object = part.getObject();
		if (object == null || !(object instanceof ElementSelectionView))
			return;
		
		ElementSelectionView view = (ElementSelectionView)object;
		ElementSelector selectedItem = view.getSelectedItem();
		
		if (selectedItem == null)
			return;
		
		Simantics.getSession().async(new WriteRequest() {
			@Override
			public void perform(WriteGraph graph) throws DatabaseException {
				graph.markUndoPoint();
				graph.deny(selectedItem.getResource());
			}
		});
	}
}