/*******************************************************************************
 * Copyright (c) 2011-2012 EclipseSource Muenchen GmbH and others.
 * 
 * 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:
 * Eike Stepper - initial API and implementation
 * Eugen Neufeld - JavaDoc
 *******************************************************************************/
package org.eclipse.emf.ecp.reflective;

import java.io.File;
import java.io.FilenameFilter;
import java.util.List;

import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EPackage;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.ecore.resource.ResourceSet;
import org.eclipse.emf.ecore.resource.impl.ResourceSetImpl;
import org.eclipse.emf.ecore.xmi.impl.EcoreResourceFactoryImpl;
import org.eclipse.emf.ecp.reflective.handlers.EPackageHelper;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 * 
 * @author Tobias Verhoeven
 */
public class Activator extends AbstractUIPlugin {

	// The plug-in ID
	public static final String PLUGIN_ID = "org.eclipse.emf.ecp.reflective"; //$NON-NLS-1$
	
	public final File location = this.getStateLocation().toFile();
	
	// The shared instance
	private static Activator plugin;
	
	/**
	 * The constructor
	 */
	public Activator() {
	}
	
	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
	 */
	public void start(BundleContext context) throws Exception {
		super.start(context);
		plugin = this;
		this.loadDynamicModels();
	}

	/*
	 * (non-Javadoc)
	 * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
	 */
	public void stop(BundleContext context) throws Exception {
		plugin = null;
		super.stop(context);
	}

	/**
	 * Returns the shared instance
	 *
	 * @return the shared instance
	 */
	public static Activator getDefault() {
		return plugin;
	}

	/**
	 * Returns an image descriptor for the image file at the given
	 * plug-in relative path
	 *
	 * @param path the path
	 * @return the image descriptor
	 */
	public static ImageDescriptor getImageDescriptor(String path) {
		return imageDescriptorFromPlugin(PLUGIN_ID, path);
	}
	
	private void loadDynamicModels() {
		File dir = this.location;
		File[] files = null;

		files = dir.listFiles(new FilenameFilter() {
			public boolean accept(File d, String name) {
				return name.endsWith(".ecore");
			}
		});
		
		if (files != null) {
			for (File file : files) {
				ResourceSet resourceSet = new ResourceSetImpl();
				resourceSet.getResourceFactoryRegistry().getExtensionToFactoryMap()
					.put("ecore", new EcoreResourceFactoryImpl());
				Resource resource = resourceSet.getResource(URI.createFileURI(file.getAbsolutePath()), true);
				EPackage model = (EPackage) resource.getContents().get(0);
				EPackage.Registry.INSTANCE.put(model.getNsURI(), model);
				List<EPackage> packages = EPackageHelper.getAllSubPackages(model);
				for (EPackage subPkg : packages) {
					EPackage.Registry.INSTANCE.put(subPkg.getNsURI(), subPkg);
				}
				System.out.println("Dynamic Model \"" + model.getNsURI() + "\" loaded.");
			}
		}
	}
}