/*-
 * ============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.introspection.sideeffect;

import java.io.UnsupportedEncodingException;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Map.Entry;
import java.util.Optional;

import javax.ws.rs.core.MultivaluedMap;

import org.apache.tinkerpop.gremlin.structure.Vertex;

import org.openecomp.aai.db.props.AAIProperties;
import org.openecomp.aai.exceptions.AAIException;
import org.openecomp.aai.introspection.Introspector;
import org.openecomp.aai.introspection.sideeffect.exceptions.AAIMultiplePropertiesException;
import org.openecomp.aai.parsers.query.QueryParser;
import org.openecomp.aai.parsers.uri.URIToObject;
import org.openecomp.aai.restcore.util.URITools;
import org.openecomp.aai.schema.enums.PropertyMetadata;
import org.openecomp.aai.serialization.db.DBSerializer;
import org.openecomp.aai.serialization.engines.TransactionalGraphEngine;

public class DataLinkWriter extends SideEffect {

	public DataLinkWriter(Introspector obj, Vertex self, TransactionalGraphEngine dbEngine, DBSerializer serializer) {
		super(obj, self, dbEngine, serializer);
	}

	@Override
	protected PropertyMetadata getPropertyMetadata() {
		return PropertyMetadata.DATA_LINK;
	}

	@Override
	protected void processURI(Optional<String> completeUri, Entry<String, String> entry)
			throws URISyntaxException, UnsupportedEncodingException, AAIException {
		if (completeUri.isPresent()) {
			URI uri = new URI(completeUri.get());
			MultivaluedMap<String, String> map = URITools.getQueryMap(uri);
			QueryParser uriQuery = dbEngine.getQueryBuilder(this.latestLoader).createQueryFromURI(uri, map);
			List<Vertex> results = uriQuery.getQueryBuilder().toList();
			if (results.size() == 1) {
				if (results.get(0).<Boolean>property(AAIProperties.LINKED).orElse(false) && obj.getValue(entry.getKey()) == null) {
					//delete vertex because property was removed
					serializer.delete(results.get(0), "", false);
				} else {
					//link vertex that already exists
					this.addLinkedProperty(results.get(0));
				}
 			} else {
				if (results.isEmpty()) {
					//locate previously linked vertex
					List<Vertex> linkedVertices = uriQuery.getQueryBuilder().getContainerQuery().getVerticesByProperty(AAIProperties.LINKED, true).toList();
					if (!linkedVertices.isEmpty()) {
						if (linkedVertices.size() > 1) {
							throw new AAIMultiplePropertiesException("multiple vertices found for single cardinality propery found when searching " + uri);
						} else {
							//found one, remove the linked property because it didn't match the uri
							linkedVertices.get(0).property(AAIProperties.LINKED).remove();
						}
					}
					if (obj.getValue(entry.getKey()) != null) {
						//add new vertex to database if we have values
						URIToObject parser = new URIToObject(this.latestLoader, uri);
						Introspector resultObj = parser.getEntity();
						Vertex newV = serializer.createNewVertex(resultObj);
						serializer.serializeToDb(resultObj, newV, uriQuery, completeUri.get(), this.latestLoader.getVersion().toString());
						this.addLinkedProperty(newV);
					}
				} else if (results.size() > 1) {
					throw new AAIMultiplePropertiesException("multiple values of " + entry.getKey() + " found when searching " + uri);
				}
			}
		} else {
			//skip processing because no required properties were specified
		}
	}
	
	@Override
	protected boolean replaceWithWildcard() {
		return true;
	}
	
	private void addLinkedProperty(Vertex v) {
		v.property(AAIProperties.LINKED, true);
	}


}