/*-
 * ============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.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Optional;
import java.util.regex.Matcher;

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.AAIMissingRequiredPropertyException;
import org.openecomp.aai.parsers.query.QueryParser;
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 DataLinkReader extends SideEffect {
	
	public DataLinkReader(Introspector obj, Vertex self, TransactionalGraphEngine dbEngine, DBSerializer serializer) {
		super(obj, self, dbEngine, serializer);
	}
	
	@Override
	protected boolean replaceWithWildcard() {
		return true;
	}

	@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().getVerticesByProperty(AAIProperties.LINKED, true).toList();
			if (results.size() == 1) {
				if (results.get(0).<Boolean>property(AAIProperties.LINKED).orElse(false) && obj.getValue(entry.getKey()) == null) {
					obj.setValue(entry.getKey(), results.get(0).property(entry.getKey()).orElse(null));
				}
			} else {
			//log something about not being able to return any values because there was more than one
			}
		}
	}
	
	/**
	 * always fuzzy search on reads
	 */
	@Override
	protected Map<String, String> findProperties(Introspector obj, String uriString) throws AAIMissingRequiredPropertyException {
		
		final Map<String, String> result = new HashMap<>();
		Matcher m = template.matcher(uriString);
		while (m.find()) {
			String propName = m.group(1);
			if (replaceWithWildcard()) {
				result.put(propName, "*");
			}
		}
		return result;
	}

}