package org.simantics.district.network.ui.contributions;

import java.util.Collection;

import javax.inject.Named;

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.services.IServiceConstants;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.ui.IEditorPart;
import org.simantics.g2d.diagram.DiagramHints;
import org.simantics.g2d.diagram.IDiagram;
import org.simantics.g2d.element.IElement;
import org.simantics.g2d.element.handler.ElementLayers;
import org.simantics.g2d.layers.ILayer;
import org.simantics.g2d.layers.ILayers;
import org.simantics.ui.workbench.e4.E4WorkbenchUtils;

public class SetFocusableHandler {

    @CanExecute
    public boolean canExecute(IEclipseContext popupContext, @Named(IServiceConstants.ACTIVE_SELECTION) ISelection selection) {
        @SuppressWarnings("unchecked")
        Collection<IElement> elements = (Collection<IElement>) popupContext.get(SetFocusableDynamicMenuContribution.FOCUSABLE_ELEMENTS);
        return elements != null && !elements.isEmpty();
    }
    
    @Execute
    public void execute(IEclipseContext popupContext, @Named(IServiceConstants.ACTIVE_SELECTION) ISelection selection, @Named(IServiceConstants.ACTIVE_PART) MPart activePart) {
        IEditorPart editorPart = E4WorkbenchUtils.getActiveIEditorPart(activePart);
        
        IDiagram diagram = editorPart.getAdapter(IDiagram.class);
        if (diagram == null)
            return;
        
        @SuppressWarnings("unchecked")
        Collection<IElement> selectedElements = (Collection<IElement>) popupContext.get(SetFocusableDynamicMenuContribution.FOCUSABLE_ELEMENTS);
        
        ILayers le = diagram.getHint(DiagramHints.KEY_LAYERS);
        for (IElement elem : selectedElements) {
            ElementLayers el = elem.getElementClass().getAtMostOneItemOfClass(ElementLayers.class);
            for (ILayer layer : le.getVisibleLayers()) {
                boolean focusable = el.isFocusable(elem, layer);
                el.setFocusability(elem, layer, !focusable);
            }
        }
    }

}