package pyUML.actions;


import org.eclipse.core.resources.IFile;
import org.eclipse.core.resources.IProject;
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.ui.IEditorPart;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

import pyUML.backend.EclipseHelperMethods;
import pyUML.backend.GlobalConstants;
import pyUML.backend.UMLToolsHelperMethods;
import pyUML.listeners.ModelChangeListener;



public class OpenModelAction implements IWorkbenchWindowActionDelegate{
	
	IProject project = null;

	public void dispose() {
		// Auto-generated method stub		
	}

	public void init(IWorkbenchWindow window) {
		// Auto-generated method stub
	}
	
	/**
	 * Opens the UML diagram for the given project
	 * @param project
	 */
	public static void runOpenModel(IProject project) {
		OpenModelAction delegate = new OpenModelAction();
		delegate.project = project;
		delegate.run((IAction) null);
	}

	public void run(IAction action) {
		this.openModel();
	}
	
	
	/**
	 * This is the central method - 
	 * A UML diagram is opened. The project set
	 * in this object is used
	 */
	public void openModel() {
		
		// Ensure a project was given
		if (this.project == null) {
			return;
		}

		// save all open editors
		EclipseHelperMethods.saveAllOpenEditors();
		
		// open diagram
		IFile diagramFile = this.project.getWorkspace()
			.getRoot().getFile(this.project.getFullPath()
					.append(GlobalConstants.getPyUmlDir())
					.append(project.getName()+GlobalConstants
							.getDiagramExtension()));
		
		if (! diagramFile.exists()) {
			MessageDialog.openWarning(null, "Opening UML diagram failed", 
				"Failed to open UML diagram, because it does not seem to exist.\n" +
				"Please use 'synchronize Model' to create a new Diagram!");
			return;
		}else {
			IEditorPart modelEditor = UMLToolsHelperMethods.openDiagram(project, diagramFile, project.getName()+".uml", true);
			modelEditor.addPropertyListener(new ModelChangeListener(project));
		}
	}

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