/**
 * ============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.query.builder;

import org.apache.tinkerpop.gremlin.process.traversal.Step;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Vertex;
import org.onap.aai.exceptions.AAIException;
import org.onap.aai.introspection.Introspector;
import org.onap.aai.introspection.Loader;
import org.onap.aai.parsers.query.QueryParser;
import org.onap.aai.parsers.query.TraversalStrategy;
import org.onap.aai.edges.enums.EdgeType;

import javax.ws.rs.core.MultivaluedMap;
import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.util.List;

/**
 * The Class TraversalQuery.
 */
public class TraversalQuery<E> extends GraphTraversalBuilder<E> {

	/**
	 * Instantiates a new traversal query.
	 *
	 * @param loader the loader
	 */
	public TraversalQuery(Loader loader, GraphTraversalSource source) {
		super(loader, source);
		this.factory = new TraversalStrategy(this.loader, this);
	}
	
	/**
	 * Instantiates a new traversal query.
	 *
	 * @param loader the loader
	 * @param start the start
	 */
	public TraversalQuery(Loader loader, GraphTraversalSource source, Vertex start) {
		super(loader, source, start);
		this.factory = new TraversalStrategy(this.loader, this);
	}
	
	protected TraversalQuery(GraphTraversal<Vertex, E> traversal, Loader loader, GraphTraversalSource source, GraphTraversalBuilder<E> gtb) {
		super(loader, source);
		this.traversal = traversal;
		this.stepIndex = gtb.getStepIndex();
		this.parentStepIndex = gtb.getParentStepIndex();
		this.containerStepIndex = gtb.getContainerStepIndex();
		this.factory = new TraversalStrategy(this.loader, this);
		this.start = gtb.getStart();
	}
	
	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryParser createQueryFromURI(URI uri) throws UnsupportedEncodingException, AAIException {
		return factory.buildURIParser(uri);
	}

	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryParser createQueryFromRelationship(Introspector relationship) throws UnsupportedEncodingException, AAIException {
		return factory.buildRelationshipParser(relationship);
	}

	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryParser createQueryFromURI(URI uri, MultivaluedMap<String, String> queryParams)
			throws UnsupportedEncodingException, AAIException {
		return factory.buildURIParser(uri, queryParams);
	}
	
	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryParser createQueryFromObjectName(String objName) {
		return factory.buildObjectNameParser(objName);
	}

	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryBuilder<E> newInstance(Vertex start) {
		return new TraversalQuery<>(loader, source, start);
	}
	
	/**
	 * @{inheritDoc}
	 */
	@Override
	public QueryBuilder<E> newInstance() {
		return new TraversalQuery<>(loader, source);
	}
	
	@Override
	protected QueryBuilder<E> cloneQueryAtStep(int index) {
		GraphTraversal.Admin<Vertex, E> cloneAdmin = getCloneAdmin(index);
		return new TraversalQuery<>(cloneAdmin, loader, source, this);
	}

	protected GraphTraversal.Admin<Vertex, E> getCloneAdmin(int index) {
		int idx = index;

		if (idx == 0) {
			idx = stepIndex;
		}

		GraphTraversal<Vertex, E> clone = this.traversal.asAdmin().clone();
		GraphTraversal.Admin<Vertex, E> cloneAdmin = clone.asAdmin();
		List<Step> steps = cloneAdmin.getSteps();

		for (int i = steps.size()-1; i >= idx; i--) {
			cloneAdmin.removeStep(i);
		}
		return cloneAdmin;
	}

	@Override
	protected QueryBuilder<E> removeQueryStepsBetween(int start, int end) {
		GraphTraversal<Vertex, E> clone = this.traversal.asAdmin().clone();
		GraphTraversal.Admin<Vertex, E> cloneAdmin = clone.asAdmin();

		for (int i = end-2; i >= start; i--) {
			cloneAdmin.removeStep(i);
		}
		return new TraversalQuery<>(cloneAdmin, loader, source, this);
	}
}