/*******************************************************************************
 * Copyright (c) 2008, 2012 Obeo.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Obeo - initial API and implementation
 *******************************************************************************/
package org.eclipse.emf.eef.codegen.ecore.ui.launcher;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.IPath;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Path;
import org.eclipse.core.runtime.Status;
import org.eclipse.core.runtime.jobs.Job;
import org.eclipse.emf.codegen.ecore.genmodel.GenModel;
import org.eclipse.emf.eef.codegen.flow.Workflow;
import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.jface.viewers.StructuredSelection;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.ui.IActionDelegate;
import org.eclipse.ui.IObjectActionDelegate;
import org.eclipse.ui.IWorkbenchPart;

/**
 * @author <a href="mailto:stephane.bouchet@obeo.fr">Stephane Bouchet</a>
 */
public abstract class GenerateEMFCodeAction implements IObjectActionDelegate {

	protected Shell shell;

	protected List<GenModel> emfGenModels;

	protected IWorkspace workspace = ResourcesPlugin.getWorkspace();

	public GenerateEMFCodeAction() {
		emfGenModels = new ArrayList<GenModel>();
	}

	/**
	 * @see IObjectActionDelegate#setActivePart(IAction, IWorkbenchPart)
	 */
	public void setActivePart(IAction action, IWorkbenchPart targetPart) {
		shell = targetPart.getSite().getShell();
	}

	/**
	 * @see IActionDelegate#run(IAction)
	 */
	public void run(IAction action) {
		if (emfGenModels != null) {
			final Workflow flow = initEMFGenFlow();
			flow.prepare();
			Job job = new Job("EEF architecture generation") {
				@Override
				protected IStatus run(IProgressMonitor monitor) {
					flow.execute(monitor);
					monitor.done();
					return Status.OK_STATUS;
				}

			};
			job.setUser(true);
			job.schedule();
		}
	}

	/**
	 * @return the flow to execute in order to generate EMF code.
	 */
	protected abstract Workflow initEMFGenFlow();

	/**
	 * @see IActionDelegate#selectionChanged(IAction, ISelection)
	 */
	public void selectionChanged(IAction action, ISelection selection) {
		emfGenModels.clear();
		if (selection instanceof StructuredSelection) {
			StructuredSelection sSelection = (StructuredSelection)selection;
			for (Object selectedElement : sSelection.toList()) {
				if (selectedElement instanceof GenModel) {
					emfGenModels.add((GenModel)selectedElement);
				}
			}

		}
	}

	protected IProject extractProject(String sPath) {
		IPath path = new Path(sPath);
		if (path.isEmpty()) {
			return null;
		}
		return workspace.getRoot().getProject(path.segment(0));
	}

}