/**
 * ============LICENSE_START==========================================
 * org.onap.aai
 * ===================================================================
 * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
 * Copyright © 2017 Amdocs
 * ===================================================================
 * 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============================================
 * ECOMP is a trademark and service mark of AT&T Intellectual Property.
 */
package org.openecomp.aai.champ.core;

import static org.junit.Assert.assertTrue;

import java.util.Collection;
import java.util.Optional;
import java.util.stream.Collectors;
import java.util.stream.Stream;

import org.junit.Test;
import org.openecomp.aai.champ.ChampAPI;
import org.openecomp.aai.champ.ChampGraph;
import org.openecomp.aai.champ.exceptions.ChampIndexNotExistsException;
import org.openecomp.aai.champ.exceptions.ChampMarshallingException;
import org.openecomp.aai.champ.exceptions.ChampObjectNotExistsException;
import org.openecomp.aai.champ.exceptions.ChampRelationshipNotExistsException;
import org.openecomp.aai.champ.exceptions.ChampSchemaViolationException;
import org.openecomp.aai.champ.exceptions.ChampUnmarshallingException;
import org.openecomp.aai.champ.model.ChampField;
import org.openecomp.aai.champ.model.ChampRelationship;
import org.openecomp.aai.champ.model.ChampRelationshipIndex;

public class ChampRelationshipIndexTest extends BaseChampAPITest {

	@Test
	public void runTest() {
		for (ChampGraph.Type apiType : ChampGraph.Type.values()) {
			final String graphName = ChampRelationshipIndexTest.class.getSimpleName();

			switch (apiType) {
			case IN_MEMORY:
			break;
			case TITAN:
				cleanUp(graphName);
			break;
			default:
			break;
			}

			final ChampAPI api = ChampAPI.Factory.newInstance(apiType);
			testChampRelationshipIndexCrud(api.getGraph(graphName));
			api.shutdown();
		}
	}
	
	private void testChampRelationshipIndexCrud(ChampGraph graph) {
	
		final ChampField relationshipField = new ChampField.Builder("propertyName").build();
		final ChampRelationshipIndex relationshipIndex = new ChampRelationshipIndex.Builder("fooEdgeIndex", "foo", relationshipField).build();

		//Test on an empty graph
		testChampRelationshipIndexStorage(graph, relationshipIndex);
		testChampRelationshipIndexDelete(graph, relationshipIndex);

		//Test with existing data in graph
		try {
			graph.storeRelationship(ChampRelationship.create()
													.ofType("uses")
													.withoutKey()
													.withSource()
														.ofType("foo")
														.withoutKey()
														.build()
													.withTarget()
														.ofType("bar")
														.withoutKey()
														.build()
													.build());
			testChampRelationshipIndexStorage(graph, relationshipIndex);
			testChampRelationshipIndexDelete(graph, relationshipIndex);
		} catch (ChampMarshallingException e) {
			throw new AssertionError(e);
		} catch (ChampSchemaViolationException e) {
			throw new AssertionError(e);
		} catch (ChampObjectNotExistsException e) {
			throw new AssertionError(e);
		} catch (ChampRelationshipNotExistsException e) {
			throw new AssertionError(e);
		} catch (ChampUnmarshallingException e) {
			throw new AssertionError(e);
		}
	}

	private void testChampRelationshipIndexDelete(ChampGraph graph, ChampRelationshipIndex relationshipIndex) {

		if (!graph.capabilities().canDeleteRelationshipIndices()) {
			try {
				graph.deleteRelationshipIndex("someindex");
				throw new AssertionError("Graph claims it doesn't support relationship index delete, but it failed to throw UnsupportedOperationException");
			} catch (UnsupportedOperationException e) {
				//Expected
			} catch (ChampIndexNotExistsException e) {
				throw new AssertionError("Graph claims it doesn't support relationship index delete, but it failed to throw UnsupportedOperationException");
			}
		} else {
			try {
				graph.deleteRelationshipIndex(relationshipIndex.getName());
	
				final Optional<ChampRelationshipIndex> retrieveRelationshipIndex = graph.retrieveRelationshipIndex(relationshipIndex.getName());
				
				if (retrieveRelationshipIndex.isPresent()) throw new AssertionError("Retrieve relationship index after deleting it");
	
				final Stream<ChampRelationshipIndex> relationshipIndices = graph.retrieveRelationshipIndices();
				final Collection<ChampRelationshipIndex> allRelationshipIndices = relationshipIndices.collect(Collectors.toList());
	
				if (allRelationshipIndices.contains(relationshipIndex)) throw new AssertionError("Retrieve all relationship indices contains previously deleted index");
				if (allRelationshipIndices.size() != 0) throw new AssertionError("Wrong number of relationship indices returned by retrieve all indices");
			} catch (ChampIndexNotExistsException e) {
				throw new AssertionError(e);
			}
	
			try {
				graph.deleteRelationshipIndex(relationshipIndex.getName());
				throw new AssertionError("Failed to throw exception on non-existent object index");
			} catch (ChampIndexNotExistsException e) {
				//Expected
			}
		}
	}

	private void testChampRelationshipIndexStorage(ChampGraph graph, ChampRelationshipIndex relationshipIndex) {

		graph.storeRelationshipIndex(relationshipIndex);
		graph.storeRelationshipIndex(relationshipIndex); //Test storing duplicate relationship index

		assertTrue(!graph.retrieveObjectIndex(relationshipIndex.getName()).isPresent()); //Make sure this wasn't stored as an object index

		final Optional<ChampRelationshipIndex> retrieveRelationshipIndex = graph.retrieveRelationshipIndex(relationshipIndex.getName());
		
		if (!retrieveRelationshipIndex.isPresent()) throw new AssertionError("Failed to retrieve relationship index after storing it");
		if (!relationshipIndex.equals(retrieveRelationshipIndex.get())) throw new AssertionError("Non-equal relationship index returned from API after storing it");

		final Stream<ChampRelationshipIndex> relationshipIndices = graph.retrieveRelationshipIndices();
		final Collection<ChampRelationshipIndex> allRelationshipIndices = relationshipIndices.collect(Collectors.toList());

		if (!allRelationshipIndices.contains(relationshipIndex)) throw new AssertionError("Retrieve all relationship indices did not return previously stored relationship index");
		if (allRelationshipIndices.size() != 1) throw new AssertionError("Wrong number of relationship indices returned by retrieve all indices");

		assertTrue(!graph.retrieveRelationshipIndex("nonExistentIndexName").isPresent());
	}

	@Test
	public void testFluentRelationshipIndexCreation() {
		final ChampRelationshipIndex relationshipIndex = ChampRelationshipIndex.create()
																.ofName("fooNameIndex")
																.onType("foo")
																.forField("name")
																.build();

		assertTrue(relationshipIndex.getName().equals("fooNameIndex"));
		assertTrue(relationshipIndex.getType().equals("foo"));
		assertTrue(relationshipIndex.getField().getName().equals("name"));
	}
}