package org.eclipse.emf.ecp.e4.view;

import javax.annotation.PostConstruct;
import javax.annotation.PreDestroy;

import org.eclipse.e4.ui.di.Focus;
import org.eclipse.e4.ui.workbench.modeling.EPartService;
import org.eclipse.e4.ui.workbench.modeling.ESelectionService;
import org.eclipse.e4.ui.workbench.swt.modeling.EMenuService;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecp.core.ECPProject;
import org.eclipse.emf.ecp.core.util.ECPContainer;
import org.eclipse.emf.ecp.core.util.ECPUtil;
import org.eclipse.emf.ecp.internal.ui.model.ModelContentProvider;
import org.eclipse.emf.ecp.internal.ui.util.ECPHandlerHelper;
import org.eclipse.emf.ecp.ui.common.TreeViewerFactory;
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.SelectionChangedEvent;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.widgets.Composite;

public class ECPModelView {

	private TreeViewer modelExplorerTree;
	private ModelContentProvider contentProvider;

	public ECPModelView(){
		
	}
	
	@PostConstruct
	public void create(Composite composite,EMenuService menuService,final ESelectionService selectionService,final EPartService partService){
		modelExplorerTree = TreeViewerFactory.createModelExplorerViewer(composite, false, null);
		menuService.registerContextMenu(modelExplorerTree.getTree(), "org.eclipse.emf.ecp.e4.application.popupmenu.navigator");
		contentProvider=(ModelContentProvider) modelExplorerTree.getContentProvider();
		modelExplorerTree.addDoubleClickListener(new IDoubleClickListener() {
			
			@Override
			public void doubleClick(DoubleClickEvent event) {
				if (event.getSelection() instanceof IStructuredSelection) {
					IStructuredSelection structuredSelection = (IStructuredSelection) event.getSelection();
					Object firstElement = structuredSelection.getFirstElement();
					
					if (firstElement instanceof ECPProject) {
						ECPProject project = (ECPProject) firstElement;
						if (!project.isOpen()) {
							project.open();
						}
					}
					else if (firstElement instanceof EObject) {
						ECPContainer context = ECPUtil.getModelContext(contentProvider, structuredSelection.toArray());
						ECPHandlerHelper.openModelElement(firstElement, (ECPProject) context);
//						MPart part=partService.createPart("org.eclipse.emf.ecp.e4.application.partdescriptor.editor");
//						part.setLabel(modelElement.eClass().getName());
//						partService.showPart(part, PartState.ACTIVATE);
					} 
				}
			}
		});
		modelExplorerTree.addSelectionChangedListener(new ISelectionChangedListener() {
			
			@Override
			public void selectionChanged(SelectionChangedEvent event) {
				ISelection selection=event.getSelection();
				if(IStructuredSelection.class.isInstance(selection)){
					IStructuredSelection structuredSelection=(IStructuredSelection) selection;
					if(!structuredSelection.isEmpty()){
						selectionService.setSelection(structuredSelection.getFirstElement());
					}
				}
			}
		});
	}
	@Focus
	public void setFocus(){
		modelExplorerTree.getTree().setFocus();
	}
	@PreDestroy
	public void dispose(){
		
	}
}