package pyUML.actions;

import org.eclipse.core.resources.IProject;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.common.util.WrappedException;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.TreeSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;
import org.eclipse.uml2.uml.Model;
import org.python.pydev.navigator.elements.PythonFile;

import pyUML.backend.GlobalConstants;
import pyUML.views.ManageViewsPage;



public class ManageViewsAction implements IObjectActionDelegate{

	IWorkbenchPart part;
	ISelection selection;
	IProject project;

	/**
	 * @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
	 */
	public void setActivePart(IAction action, IWorkbenchPart part) {
			this.part = part;
	}
	

	/**
	 * Manual way to open a window to manage pyUML.views
	 * A project is needed to open a ManagViews Window 
	 * @param project An eclipse project
	 */
	public static void run(IProject project) {
		ManageViewsAction manageViews = new ManageViewsAction();
		manageViews.project = project;
		manageViews.run((IAction) null);
	}
	
	
	/**
	 * The run method used when the action is executed
	 * -> a new manage pyUML.views window is opened
	 */
	public void run(IAction action) {
		
		try{
			String umlFileName=project.getLocation().
				append(GlobalConstants.getPyUmlDir()).
				append(project.getName()+".uml").toOSString();
			
			EObject diagramRoot = null;
			try {
				Resource resource = new ResourceSetImpl().getResource(URI.createFileURI(umlFileName), true);
				diagramRoot = (EObject) resource.getContents().get(0);
			} catch (WrappedException ex) {
				MessageDialog.openError(null,"Error opening UML model", 
						"Unable to load model: " + umlFileName + "\n" +
						"You must create a model before you can create pyUML.views!");
				return;
			}
			
			Model model = (Model) diagramRoot;
			
			ManageViewsPage page = new ManageViewsPage((Shell) null, model, project);
			if (page != null)
				page.open();
			
		}catch (Throwable t) {
			MessageDialog.openError(null,t.getClass().getName(),"Error Managing Views:\n"+t.getClass().getName()+"\n"+t.getMessage());
			t.printStackTrace();
		}
		
	}

	public void selectionChanged(IAction action, ISelection selection) {
		if (selection instanceof TreeSelection) {
			TreeSelection ts = (TreeSelection) selection;
			Object selectedElement = ts.getFirstElement();
			this.project = (IProject) selectedElement;
		}
	}
}