/*-
 * ============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.dbgen;


import com.att.eelf.configuration.EELFLogger;
import com.att.eelf.configuration.EELFManager;
import com.google.common.collect.Multimap;
import com.thinkaurelius.titan.core.*;
import com.thinkaurelius.titan.core.schema.TitanManagement;
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.Loader;
import org.openecomp.aai.introspection.LoaderFactory;
import org.openecomp.aai.introspection.ModelType;
import org.openecomp.aai.schema.enums.PropertyMetadata;
import org.openecomp.aai.serialization.db.EdgeRule;
import org.openecomp.aai.serialization.db.EdgeRules;
import org.openecomp.aai.util.AAIConfig;

import java.util.*;


public class SchemaGenerator {

	private static final EELFLogger LOGGER = EELFManager.getInstance().getLogger(SchemaGenerator.class);
	private static boolean addDefaultCR = true;
	
	
	 /**
 	 * Load schema into titan.
 	 *
 	 * @param graph the graph
 	 * @param graphMgmt the graph mgmt
 	 * @param addDefaultCloudRegion the add default cloud region
 	 */
 	public static void loadSchemaIntoTitan(final TitanGraph graph, final TitanManagement graphMgmt, boolean addDefaultCloudRegion) {
		 addDefaultCR = addDefaultCloudRegion;
		 loadSchemaIntoTitan(graph, graphMgmt);
	 }
	
    /**
     * Load schema into titan.
     *
     * @param graph the graph
     * @param graphMgmt the graph mgmt
     */
    public static void loadSchemaIntoTitan(final TitanGraph graph, final TitanManagement graphMgmt) {

    	try {
    		AAIConfig.init();
    	}
    	catch (Exception ex){
			LOGGER.error(" ERROR - Could not run AAIConfig.init(). ", ex);
			System.exit(1);
		}
    	
        // NOTE - Titan 0.5.3 doesn't keep a list of legal node Labels.  
    	//   They are only used when a vertex is actually being created.  Titan 1.1 will keep track (we think).
        	

		// Use EdgeRules to make sure edgeLabels are defined in the db.  NOTE: the multiplicty used here is 
    	// always "MULTI".  This is not the same as our internal "Many2Many", "One2One", "One2Many" or "Many2One"
    	// We use the same edge-label for edges between many different types of nodes and our internal
    	// multiplicty definitions depends on which two types of nodes are being connected.

		Multimap<String, EdgeRule> edges = null;
		Set<String> labels = new HashSet<>();
		try {
			edges = EdgeRules.getInstance().getAllRules();
			for (EdgeRule rule : edges.values()) {
				labels.add(rule.getLabel());
			}
		} catch (AAIException e) {
			LOGGER.error("could not get edge rules", e);
			System.exit(1);
		}
		for( String label: labels){
			if( graphMgmt.containsRelationType(label) ) {
            	LOGGER.debug(" EdgeLabel  [" + label + "] already existed. ");
            } else {
            	LOGGER.debug("Making EdgeLabel: [" + label + "]");
            	graphMgmt.makeEdgeLabel(label).multiplicity(Multiplicity.valueOf("MULTI")).make();
            }
        }     

		Loader loader = LoaderFactory.createLoaderForVersion(ModelType.MOXY, AAIProperties.LATEST);
		Map<String, Introspector> objs = loader.getAllObjects();
		Map<String, PropertyKey> seenProps = new HashMap<>();
		
		for (Introspector obj : objs.values()) {
			for (String propName : obj.getProperties()) {
				String dbPropName = propName;
				Optional<String> alias = obj.getPropertyMetadata(propName, PropertyMetadata.DB_ALIAS);
				if (alias.isPresent()) {
					dbPropName = alias.get();
				}
				if( graphMgmt.containsRelationType(propName) ){
	            	LOGGER.debug(" PropertyKey  [" + propName + "] already existed in the DB. ");
	            } else {
	            	Class<?> type = obj.getClass(propName);
	            	Cardinality cardinality = Cardinality.SINGLE;
	            	boolean process = false;
	            	if (obj.isListType(propName) && obj.isSimpleGenericType(propName)) {
	            		cardinality = Cardinality.SET;
	            		type = obj.getGenericTypeClass(propName);
	            		process = true;
	            	} else if (obj.isSimpleType(propName)) {
	            		process = true;
	            	}

	            	if (process) {

		            	LOGGER.info("Creating PropertyKey: [" + dbPropName + "], ["+ type.getSimpleName() + "], [" + cardinality + "]");
		            	PropertyKey propK;
		            	if (!seenProps.containsKey(dbPropName)) {
		            		propK = graphMgmt.makePropertyKey(dbPropName).dataType(type).cardinality(cardinality).make();
		            		seenProps.put(dbPropName, propK);
		            	} else {
		            		propK = seenProps.get(dbPropName);
		            	}
		            	if (graphMgmt.containsGraphIndex(dbPropName)) {
			            	LOGGER.debug(" Index  [" + dbPropName + "] already existed in the DB. ");
		            	} else {
		            		if( obj.getIndexedProperties().contains(propName) ){
			                 	if( obj.getUniqueProperties().contains(propName) ){
			 						LOGGER.info("Add Unique index for PropertyKey: [" + dbPropName + "]");
			                         graphMgmt.buildIndex(dbPropName,Vertex.class).addKey(propK).unique().buildCompositeIndex();
			                     } else {
			                     	LOGGER.info("Add index for PropertyKey: [" + dbPropName + "]");
			                         graphMgmt.buildIndex(dbPropName,Vertex.class).addKey(propK).buildCompositeIndex();
			                     }
			                 } else {
			                 	LOGGER.info("No index added for PropertyKey: [" + dbPropName + "]");
			                 }
		            	}
	            	}
	            }
			}
		}
        
        LOGGER.info("-- About to call graphMgmt commit");
        graphMgmt.commit();
    }// End of loadSchemaIntoTitan()

}