/**
 * ============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.extensions;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.List;

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.introspection.exceptions.AAIUnknownObjectException;
import org.onap.aai.parsers.query.QueryParser;
import org.onap.aai.query.builder.QueryBuilder;
import org.onap.aai.rest.db.DBRequest;
import org.onap.aai.restcore.HttpMethod;
import org.onap.aai.serialization.db.EdgeType;

public class OrphanLInterfaceHandler {
	
	private QueryBuilder<Vertex> createLInterfaceQuery(AAIExtensionMap aaiReqMap, Introspector newvceObj) throws AAIException {
		Introspector uplinkLInterfaceTraversalIntro = aaiReqMap.getLoader().introspectorFromName("l-interface");
		
		Introspector customerUplinkLInterfaceTraversalIntro = aaiReqMap.getLoader().introspectorFromName("l-interface");
		
		Introspector logLinkIntroForTraversal = aaiReqMap.getLoader().introspectorFromName("logical-link");
		
		QueryBuilder<Vertex> query = aaiReqMap.getTransactionalGraphEngine().getQueryBuilder()
										.exactMatchQuery(newvceObj)
										.createEdgeTraversal(EdgeType.TREE, newvceObj, uplinkLInterfaceTraversalIntro)
										.getVerticesByProperty("interface-role", "UPLINK")
										.createEdgeTraversal(EdgeType.COUSIN, uplinkLInterfaceTraversalIntro, logLinkIntroForTraversal)
										.createEdgeTraversal(EdgeType.COUSIN, logLinkIntroForTraversal, customerUplinkLInterfaceTraversalIntro)
										.getVerticesByProperty("interface-role", "CUSTOMER-UPLINK").dedup();
		return query;
	}
	
	private URI buildLInterfaceURI(Vertex linterface, AAIExtensionMap aaiReqMap) throws UnsupportedEncodingException, AAIException, URISyntaxException {
		Loader loader = aaiReqMap.getLoader();
		Introspector lint = loader.introspectorFromName("l-interface");
		lint.setValue("interface-name", (String)linterface.property("interface-name").value());
		String lintSegment = lint.getURI();
		
		Introspector lagInterfaceForTrav = loader.introspectorFromName("lag-interface");
		QueryBuilder<Vertex> lagIntQuery = aaiReqMap.getTransactionalGraphEngine().getQueryBuilder()
										.exactMatchQuery(lint)
										.createEdgeTraversal(EdgeType.TREE, linterface, lagInterfaceForTrav).dedup();
		List<Vertex> lagInterfaces = lagIntQuery.toList();
		if (lagInterfaces.isEmpty()) {
			throw new AAIException("AAI_6114");
		} else if (lagInterfaces.size() > 1) {
			throw new AAIException("AAI_6140");
		}
		Vertex lagInt = lagInterfaces.get(0);
		lagInterfaceForTrav.setValue("interface-name", (String)lagInt.property("interface-name").value());
		String lagSegment = lagInterfaceForTrav.getURI();
		
		Introspector gvVPEforTrav = loader.introspectorFromName("generic-vnf");
		QueryBuilder<Vertex> gvVPEquery = aaiReqMap.getTransactionalGraphEngine().getQueryBuilder()
										.exactMatchQuery(lagInterfaceForTrav)
										.createEdgeTraversal(EdgeType.TREE, lagInterfaceForTrav, gvVPEforTrav).dedup();
		List<Vertex> genvnfs = gvVPEquery.toList();
		if (genvnfs.isEmpty()) {
			throw new AAIException("AAI_6114");
		} else if (genvnfs.size() > 1) {
			throw new AAIException("AAI_6140");
		}
		Vertex genvnf = genvnfs.get(0);
		gvVPEforTrav.setValue("vnf-id", (String)genvnf.property("vnf-id").value());
		String gvSegment = gvVPEforTrav.getURI();
		
		return new URI(gvSegment + lagSegment + lintSegment);
	}

	public List<DBRequest> createOrphanLInterfaceDelRequests(AAIExtensionMap aaiReqMap, Introspector newvce) throws AAIException, UnsupportedEncodingException, URISyntaxException{
		List<DBRequest> requests = new ArrayList<>();
		QueryBuilder<Vertex> query = createLInterfaceQuery(aaiReqMap, newvce);
		List<Vertex> linterfaces = query.toList();
		
		for (Vertex lint : linterfaces) {
			URI lintURI = buildLInterfaceURI(lint, aaiReqMap);
			QueryParser parser = createLInterfaceQuery(aaiReqMap, newvce).createQueryFromObjectName("l-interface");
			DBRequest originalDbRequest = aaiReqMap.getDbRequest();
			DBRequest request = new DBRequest.Builder(HttpMethod.DELETE, lintURI, parser, newvce, originalDbRequest.getHeaders(), originalDbRequest.getInfo(), originalDbRequest.getTransactionId()).build();
			requests.add(request);
		}
		
		return requests;
	}
}