/**
 * ============LICENSE_START=======================================================
 * org.onap.aai
 * ================================================================================
 * Copyright © 2017-2018 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
package org.onap.aai.serialization.queryformats;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.spy;
import static org.mockito.Mockito.when;

import java.io.UnsupportedEncodingException;

import org.apache.tinkerpop.gremlin.process.traversal.Path;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.process.traversal.step.util.Tree;
import org.apache.tinkerpop.gremlin.process.traversal.strategy.verification.ReadOnlyStrategy;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.T;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;
import org.junit.Before;
import org.junit.Test;
import org.mockito.Mock;
import org.mockito.MockitoAnnotations;
import org.onap.aai.AAISetup;
import org.onap.aai.dbmap.DBConnectionType;
import org.onap.aai.exceptions.AAIException;
import org.onap.aai.introspection.Loader;
import org.onap.aai.introspection.LoaderFactory;
import org.onap.aai.introspection.ModelType;
import org.onap.aai.introspection.Version;
import org.onap.aai.serialization.db.DBSerializer;
import org.onap.aai.serialization.db.EdgeRules;
import org.onap.aai.serialization.engines.QueryStyle;
import org.onap.aai.serialization.engines.TitanDBEngine;
import org.onap.aai.serialization.engines.TransactionalGraphEngine;
import org.onap.aai.serialization.queryformats.exceptions.AAIFormatQueryResultFormatNotSupported;
import org.onap.aai.serialization.queryformats.exceptions.AAIFormatVertexException;
import org.onap.aai.serialization.queryformats.utils.UrlBuilder;

import com.google.gson.JsonObject;
import com.google.gson.JsonParser;

public class MultiFormatTest extends AAISetup {

	@Mock
	private UrlBuilder urlBuilder;

	private Graph graph;
	private TransactionalGraphEngine dbEngine;
	private Loader loader;
	private IdURL idFormat;
	private final ModelType factoryType = ModelType.MOXY;
	private final EdgeRules rules = EdgeRules.getInstance();
	private Tree<?> resultTree;
	private Path resultPath;
	private Version version = Version.v11;
	private JsonObject expectedTreeIdFormat = new JsonParser()
			.parse("{\"nodes\":[{\"resource-type\":\"generic-vnf\",\"nodes\":[{\"resource-type\":\"vserver\",\"nodes\":[{\"resource-type\":\"pserver\"}]},{\"resource-type\":\"pserver\",\"nodes\":[{\"resource-type\":\"complex\"}]}]}]}").getAsJsonObject();
	private JsonObject expectedPathIdFormat = new JsonParser()
			.parse("{\"path\":[{\"resource-type\":\"generic-vnf\"},{\"resource-type\":\"vserver\"},{\"resource-type\":\"pserver\"},{\"resource-type\":\"complex\"}]}").getAsJsonObject();

	@Before
	public void setUp() throws Exception {

		MockitoAnnotations.initMocks(this);

		graph = TinkerGraph.open();

		Vertex gnvf1 = graph.addVertex(T.label, "generic-vnf", T.id, "0", "aai-node-type", "generic-vnf", "vnf-id",
				"vnf-id-1", "vnf-name", "vnf-name-1");
		Vertex vserver1 = graph.addVertex(T.label, "vserver", T.id, "1", "aai-node-type", "vserver", "vserver-id",
				"vserver-id-1", "vserver-name", "vserver-name-1");
		Vertex pserver1 = graph.addVertex(T.label, "pserver", T.id, "2", "aai-node-type", "pserver", "hostname",
				"hostname-1");
		Vertex complex1 = graph.addVertex(T.label, "complex", T.id, "3", "aai-node-type", "complex",
				"physical-location-id", "physical-location-id-1", "country", "US");

		Vertex pserver2 = graph.addVertex(T.label, "pserver", T.id, "5", "aai-node-type", "pserver", "hostname",
				"hostname-2");
		Vertex complex2 = graph.addVertex(T.label, "complex", T.id, "6", "aai-node-type", "complex",
				"physical-location-id", "physical-location-id-2", "country", "US");

		GraphTraversalSource g = graph.traversal();
		rules.addEdge(g, gnvf1, vserver1);
		rules.addEdge(g, vserver1, pserver1);
		rules.addEdge(g, pserver1, complex1);
		rules.addEdge(g, gnvf1, pserver2);
		rules.addEdge(g, pserver2, complex2);

		resultTree = graph.traversal().V("0").out().out().tree().next();
		resultPath = graph.traversal().V("0").out().hasId("1").out().hasId("2").out().hasId("3").path().next();
	}

	@Test
	public void testTreeResultQueryIdFormat()
			throws AAIFormatVertexException, AAIException, AAIFormatQueryResultFormatNotSupported {

		createLoaderEngineSetup();
		idFormat = new IdURL(loader, urlBuilder);

		assertNotNull(dbEngine.tx());
		assertNotNull(dbEngine.asAdmin());

		JsonObject json = idFormat.formatObject(resultTree);
		
		assertEquals(this.expectedTreeIdFormat, json);

	}
	
	@Test
	public void testPathResultQueryIdFormat()
			throws AAIFormatVertexException, AAIException, AAIFormatQueryResultFormatNotSupported {

		createLoaderEngineSetup();
		idFormat = new IdURL(loader, urlBuilder);

		assertNotNull(dbEngine.tx());
		assertNotNull(dbEngine.asAdmin());

		JsonObject json = idFormat.formatObject(resultPath);
		
		assertEquals(this.expectedPathIdFormat, json);

	}

	
	@Test(expected = AAIFormatQueryResultFormatNotSupported.class)
	public void testThrowsExceptionIfObjectNotSupported() throws AAIFormatVertexException,
			AAIException, UnsupportedEncodingException, AAIFormatQueryResultFormatNotSupported {

		loader = mock(Loader.class);
		idFormat = new IdURL(loader, urlBuilder);
		idFormat.formatObject(new String());
	}

	public void createLoaderEngineSetup() {

		if (loader == null) {
			loader = LoaderFactory.createLoaderForVersion(factoryType, version);
			dbEngine = spy(new TitanDBEngine(QueryStyle.TRAVERSAL, DBConnectionType.CACHED, loader));

			TransactionalGraphEngine.Admin spyAdmin = spy(dbEngine.asAdmin());

			when(dbEngine.tx()).thenReturn(graph);
			when(dbEngine.asAdmin()).thenReturn(spyAdmin);

			when(spyAdmin.getReadOnlyTraversalSource())
					.thenReturn(graph.traversal(GraphTraversalSource.build().with(ReadOnlyStrategy.instance())));
			when(spyAdmin.getTraversalSource()).thenReturn(graph.traversal());
		}
	}
}