/*******************************************************************************
 * Copyright (c) 2011, 2014 Formal Mind GmbH and University of Dusseldorf.
 * 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:
 *     Michael Jastram - initial API and implementation
 ******************************************************************************/
package org.eclipse.rmf.reqif10.pror.testframework;

import java.io.File;
import java.io.IOException;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

import org.eclipse.emf.common.command.BasicCommandStack;
import org.eclipse.emf.common.command.Command;
import org.eclipse.emf.common.command.CommandStack;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.common.notify.Notification;
import org.eclipse.emf.common.util.URI;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.ecore.EStructuralFeature;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.command.AddCommand;
import org.eclipse.emf.edit.command.CommandParameter;
import org.eclipse.emf.edit.command.RemoveCommand;
import org.eclipse.emf.edit.command.SetCommand;
import org.eclipse.emf.edit.domain.AdapterFactoryEditingDomain;
import org.eclipse.emf.edit.domain.EditingDomain;
import org.eclipse.emf.edit.provider.ComposedAdapterFactory;
import org.eclipse.emf.edit.provider.IItemLabelProvider;
import org.eclipse.emf.edit.provider.INotifyChangedListener;
import org.eclipse.emf.edit.provider.ItemProvider;
import org.eclipse.emf.edit.provider.ItemProviderAdapter;
import org.eclipse.emf.edit.provider.ReflectiveItemProviderAdapterFactory;
import org.eclipse.emf.edit.provider.resource.ResourceItemProviderAdapterFactory;
import org.eclipse.rmf.ext.prostep.util.ProstepAdapterFactory;
import org.eclipse.rmf.reqif10.ReqIF;
import org.eclipse.rmf.reqif10.pror.configuration.provider.ConfigurationItemProviderAdapterFactory;
import org.eclipse.rmf.reqif10.pror.configuration.util.ConfigurationAdapterFactory;
import org.eclipse.rmf.reqif10.pror.provider.ReqIF10ItemProviderAdapterFactory;
import org.eclipse.rmf.reqif10.pror.testdata.TestData;
import org.eclipse.rmf.reqif10.serialization.ReqIF10ResourceFactoryImpl;
import org.eclipse.rmf.reqif10.serialization.ReqIF10ResourceImpl;
import org.eclipse.rmf.serialization.XMLPersistenceMappingResourceSetImpl;
import org.junit.After;
import org.junit.Before;

/**
 * Abstract class designed for testing {@link ItemProvider}s with JUnit 4. It
 * provides a basic infrastructure of {@link #adapterFactory},
 * {@link #editingDomain} and {@link #commandStack}.
 * <p>
 * 
 * In addition, it provides a {@link #listener} that can be attached to
 * anything. The notifications it receives are collected in
 * {@link #notifications} for validation.
 * <p>
 * 
 * It is possible, to filter the notifications that are being collected. Often,
 * we attach the listener to an ItemProvider. There is only one ItemProvider
 * for a class of Objects (e.g. SpecObjects), but we're interested only in one
 * particular object. calling #setListenerFilter() can limit the Notifications
 * that are being collected.
 * 
 * Models for testing can be stored as RIF files and retrieved via
 * {@link #getTestRIF(String)}. There is {@link #getItemProvider(Object)} for
 * easily retrieve the provider for a given element.
 * 
 * @author jastram
 */
abstract public class AbstractItemProviderTest {

	/** The properly configured {@link AdapterFactory} */
	public ComposedAdapterFactory adapterFactory;

	/** The properly configured {@link EditingDomain} */
	public AdapterFactoryEditingDomain editingDomain;

	/** The properly configured {@link CommandStack} */
	public BasicCommandStack commandStack;

	/**
	 * A listener that can be used for testing. If notified, it writes the
	 * notification to {@link #notifications}.
	 */
	public INotifyChangedListener listener;

	/** The notifications from {@link #listener}. */
	public List<Notification> notifications = new ArrayList<Notification>();

	private Filter filter;

	@Before
	public void setupAbstractItemProviderTest() {
		adapterFactory = new ComposedAdapterFactory(
				ComposedAdapterFactory.Descriptor.Registry.INSTANCE);
		adapterFactory
				.addAdapterFactory(new ResourceItemProviderAdapterFactory());
		adapterFactory.addAdapterFactory(new ConfigurationAdapterFactory());
		adapterFactory
				.addAdapterFactory(new ReqIF10ItemProviderAdapterFactory());
		adapterFactory
				.addAdapterFactory(new ReflectiveItemProviderAdapterFactory());
		adapterFactory
				.addAdapterFactory(new ConfigurationItemProviderAdapterFactory());
		adapterFactory.addAdapterFactory(new ProstepAdapterFactory());
		
		
		commandStack = new BasicCommandStack();
		editingDomain = new AdapterFactoryEditingDomain(adapterFactory,
				commandStack, new XMLPersistenceMappingResourceSetImpl());

		editingDomain.getResourceSet().getResourceFactoryRegistry()
				.getExtensionToFactoryMap()
				.put("reqif", new ReqIF10ResourceFactoryImpl());

		listener = new INotifyChangedListener() {
			public void notifyChanged(Notification notification) {
				if (filter != null) {
					if (!filter.accept(notification)) {
						return;
					}
				}
				AbstractItemProviderTest.this.notifications.add(notification);
			}
		};
	}

	@After
	public void teardownAbstractItemProviderTest() {
		adapterFactory = null;
		editingDomain = null;
		commandStack = null;
		listener = null;
		filter = null;
		notifications = new ArrayList<Notification>();
	}

	public void setListenerFilter(Filter filter) {
		this.filter = filter;		
	}

	/**
	 * Builds a ReqIF model from a file that is stored in org.eclipse.rmf.reqif10.pror.testdata.
	 * 
	 * @param filename
	 *            without path
	 * @return a {@link RIF} object
	 * @throws URISyntaxException
	 */
	public ReqIF getTestReqif(String filename) throws URISyntaxException {
		URI resourceURI = TestData.getURI(filename);
		Resource resource = editingDomain.getResourceSet().getResource(
				resourceURI, true);
		ReqIF reqif = (ReqIF) resource.getContents().get(0);
		return reqif;
	}

	/**
	 * Tries to retrieve the Itemprovider for the given object.
	 * 
	 * @return the ItemProvider or null.
	 */
	public ItemProviderAdapter getItemProvider(Object obj) {
		// We assume that all itemproviders implement IItemLabelProvider,
		// otherwise this wouldn't work.
		return (ItemProviderAdapter) this.adapterFactory.adapt(obj,
				IItemLabelProvider.class);
	}

	protected void setViaCommand(Object object, EStructuralFeature feature, Object value) {
		ItemProviderAdapter ip = getItemProvider(object);
		Command cmd;
		if (feature.isMany()) {
			List<Object> list = new ArrayList<Object>();
			list.add(value);
			cmd = ip.createCommand(object, editingDomain, AddCommand.class,
					new CommandParameter(object, feature, list));
		} else {
			cmd = ip.createCommand(object, editingDomain, SetCommand.class,
					new CommandParameter(object, feature, value));			
		}
		commandStack.execute(cmd);
	}

	protected void removeViaCommand(Object object, EStructuralFeature feature, Object value) {
		ItemProviderAdapter ipad = getItemProvider(object);
		Command cmd;
		if (feature.isMany()) {
			List<Object> list = new ArrayList<Object>();
			list.add(value);
			cmd = ipad.createCommand(object, editingDomain, RemoveCommand.class,
					new CommandParameter(object, feature, list));
		} else {
			cmd = ipad.createCommand(object, editingDomain, SetCommand.class,
					new CommandParameter(object, feature, null));			
		}
		commandStack.execute(cmd);
	}
	
	/**
	 * Convenience Method for quickly printing XML to the console.  Works for any ReqIF element.
	 */
	public void dumpEObjectToConsole(EObject eobj) throws IOException {
		URI fileURI;
		Resource resource = eobj.eResource();
		if (resource == null) {
			File tempFile = File.createTempFile("reqif", ".reqif");
			tempFile.deleteOnExit();
			fileURI = URI.createFileURI(tempFile.getAbsolutePath());
			resource = editingDomain.getResourceSet().createResource(fileURI);
		}
		((ReqIF10ResourceImpl) resource).setIsLoading(true);
		resource.getContents().add(eobj);
		resource.save(System.out, null);
	}
	
}