/*-
 * ============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 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;

import javax.ws.rs.core.MultivaluedMap;
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;

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;
	}

}