/*-
 * ============LICENSE_START=======================================================
 * org.openecomp.aai
 * ================================================================================
 * Copyright (C) 2017 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.openecomp.aai.serialization.engines.query;

import java.util.HashSet;
import java.util.List;
import java.util.Set;

import org.openecomp.aai.db.props.AAIProperties;
import org.openecomp.aai.query.builder.QueryBuilder;
import org.openecomp.aai.serialization.engines.TransactionalGraphEngine;
import com.tinkerpop.blueprints.Direction;
import com.tinkerpop.blueprints.TransactionalGraph;
import com.tinkerpop.blueprints.Vertex;
import com.tinkerpop.gremlin.java.GremlinPipeline;
import com.tinkerpop.pipes.IdentityPipe;
import com.tinkerpop.pipes.PipeFunction;
import com.tinkerpop.pipes.branch.LoopPipe;

public class GremlinPipelineQueryEngine extends QueryEngine {

	public GremlinPipelineQueryEngine(TransactionalGraphEngine graphEngine) {
		super(graphEngine);
	}

	@Override
	public List<Vertex> executeQuery(TransactionalGraph g, QueryBuilder query) {
		List<Vertex> results = null;
		Vertex start = query.getStart();
		if (start != null) {
			results = ((GremlinPipeline)query.getQuery()).cast(Vertex.class).toList();
		} else {
			GremlinPipeline pipe = new GremlinPipeline(g);
			results = process(pipe, (GremlinPipeline)query.getQuery());

		}
		return results;
	}
	
	@Override
	public List<Vertex> executeParentQuery(TransactionalGraph g, QueryBuilder query) {
		List<Vertex> results = null;
		Vertex start = query.getStart();
		if (start != null) {
			results = ((GremlinPipeline)query.getParentQuery()).cast(Vertex.class).toList();
		} else {
			GremlinPipeline pipe = new GremlinPipeline(g);
			results = process(pipe, (GremlinPipeline)query.getParentQuery());

		}
		return results;
	}

	@Override
	public List<Vertex> findParents(Vertex start) {
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline(start).as("x").inE()
				.has("isParent", true).outV().loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.inE().has("isParent", true).count() == 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		return results;
	}

	@Override
	public List<Vertex> findChildren(Vertex start) {
		Set<Vertex> seen = new HashSet<>();
		seen.add(start);
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline(start).as("x").outE().has("isParent", true).inV()
				.except(seen).store(seen).loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.outE().has("isParent", true).count() >= 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		return results;
	}

	@Override
	public List<Vertex> findDeletable(Vertex start) {
		Set<Vertex> seen = new HashSet<>();
		seen.add(start);
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>(start).as("x").outE().or(
				new GremlinPipeline(new IdentityPipe()).has("isParent", true),
				new GremlinPipeline(new IdentityPipe()).has("hasDelTarget", true)).inV()
				.except(seen).store(seen).loop("x", new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						GremlinPipeline<Vertex, Long> pipe = new GremlinPipeline<>(argument.getObject());
						return pipe.outE().or(
								new GremlinPipeline(new IdentityPipe()).has("isParent", true),
								new GremlinPipeline(new IdentityPipe()).has("hasDelTarget", true)).count() >= 1 || argument.getLoops() < 100;
					}
					
				}, new PipeFunction<LoopPipe.LoopBundle<Vertex>, Boolean>() {

					@Override
					public Boolean compute(LoopPipe.LoopBundle<Vertex> argument) {
						return true;
					}
					
				});
		List<Vertex> results = pipe.toList();
		results.add(0, start);
		
		return results;
	}
	
	private List<Vertex> process(GremlinPipeline start, GremlinPipeline pipe) {
		
		
		return start.add(pipe).cast(Vertex.class).toList();
	}

	@Override
	public List<Vertex> findRelatedVertices(Vertex start, Direction direction, String label, String nodeType) {
		GremlinPipeline<Vertex, Vertex> pipe = new GremlinPipeline<Vertex, Vertex>(start);
		switch (direction) {
			case OUT:
				pipe.out(label);
				break;
			case IN:
				pipe.in(label);
				break;
			case BOTH:
				pipe.both(label);
				break;
			 default:
				break;
		}
		
		pipe.has(AAIProperties.NODE_TYPE, nodeType).dedup();
		List<Vertex> result = pipe.toList();
		return result;
	}

}
*/