/*******************************************************************************
 * Copyright (c) 2007, 2010 Association for Decentralized Information Management
 * in Industry THTH ry.
 * 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:
 *     VTT Technical Research Centre of Finland - initial API and implementation
 *******************************************************************************/
package org.simantics.db.tests.api.support.virtualGraphSupport;

import java.util.UUID;

import org.junit.Test;
import org.simantics.databoard.Bindings;
import org.simantics.db.Resource;
import org.simantics.db.Session;
import org.simantics.db.VirtualGraph;
import org.simantics.db.WriteGraph;
import org.simantics.db.common.request.WriteRequest;
import org.simantics.db.common.request.WriteResultRequest;
import org.simantics.db.exception.DatabaseException;
import org.simantics.db.service.VirtualGraphSupport;
import org.simantics.db.testing.base.TestCleanDb;
import org.simantics.layer0.Layer0;

public class VirtualGraphTest extends TestCleanDb {
	
	private Error exception; 
	
	@Test
	public void test() throws DatabaseException {
		
		Session session = getSession();
		
		session.syncRequest(new WriteRequest() {

			@Override
			public void perform(WriteGraph graph) throws DatabaseException {
				
				Layer0 L0 = Layer0.getInstance(graph);

				final Resource newResource = graph.syncRequest(new WriteResultRequest<Resource>() {

					@Override
					public Resource perform(WriteGraph graph) throws DatabaseException {
						
						Layer0 L0 = Layer0.getInstance(graph);
						Resource result = graph.newResource();
						graph.addLiteral(result, L0.HasName, L0.NameOf, L0.String, "RootLibrary", Bindings.STRING);
						return result;
						
					}
					
				});
				
				String rootName = graph.getRelatedValue(newResource, L0.HasName);
				if(!rootName.equals("RootLibrary")) {
					exception = new AssertionError("rootName != 'RootLibrary'");
					throw exception;
				}

				VirtualGraphSupport support = graph.getSession().getService(VirtualGraphSupport.class);
				final VirtualGraph virtual = support.getMemoryPersistent(UUID.randomUUID().toString());

				graph.syncRequest(new WriteRequest(virtual) {

					@Override
					public void perform(WriteGraph graph) throws DatabaseException {
						
						Layer0 L0 = Layer0.getInstance(graph);
						graph.addLiteral(newResource, L0.HasName, L0.NameOf, L0.String, "RootLibrary2", Bindings.STRING);
						
					}
					
				});
				
				rootName = graph.getRelatedValue(newResource, L0.HasName);
				if(!rootName.equals("RootLibrary2")) {
					exception = new AssertionError("rootName != 'RootLibrary2'");
					throw exception;
				}
				
				support.discard(virtual);
				
				rootName = graph.getRelatedValue(newResource, L0.HasName);
				if(!rootName.equals("RootLibrary")) {
					exception = new AssertionError("rootName != 'RootLibrary'");
					throw exception;
				}

			}
			
		});
		
		if(exception != null) {
			fail("Write transaction threw and exception (" + exception.getMessage() + ") which was not passed through ");
		}
		
	}

}