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/*-
 * ============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.db.schema;

import com.thinkaurelius.titan.core.EdgeLabel;
import com.thinkaurelius.titan.core.PropertyKey;
import com.thinkaurelius.titan.core.TitanGraph;
import com.thinkaurelius.titan.core.schema.TitanGraphIndex;
import com.thinkaurelius.titan.core.schema.TitanManagement;
import java.util.Iterator;
import java.util.LinkedHashSet;
import org.apache.tinkerpop.gremlin.structure.Vertex;

public class AuditTitan extends Auditor {

    private final TitanGraph graph;

    /**
     * Instantiates a new audit titan.
     *
     * @param g the g
     */
    public AuditTitan(TitanGraph g) {
        this.graph = g;
        buildSchema();
    }

    /**
     * Builds the schema.
     */
    private void buildSchema() {
        populateProperties();
        populateIndexes();
        populateEdgeLabels();
    }

    /**
     * Populate properties.
     */
    private void populateProperties() {
        TitanManagement mgmt = graph.openManagement();
        Iterable<PropertyKey> iterable = mgmt.getRelationTypes(PropertyKey.class);
        Iterator<PropertyKey> titanProperties = iterable.iterator();
        PropertyKey propKey;
        while (titanProperties.hasNext()) {
            propKey = titanProperties.next();
            DBProperty prop = new DBProperty();

            prop.setName(propKey.name());
            prop.setCardinality(propKey.cardinality());
            prop.setTypeClass(propKey.dataType());

            this.properties.put(prop.getName(), prop);
        }
    }

    /**
     * Populate indexes.
     */
    private void populateIndexes() {
        TitanManagement mgmt = graph.openManagement();
        Iterable<TitanGraphIndex> iterable = mgmt.getGraphIndexes(Vertex.class);
        Iterator<TitanGraphIndex> titanIndexes = iterable.iterator();
        TitanGraphIndex titanIndex;
        while (titanIndexes.hasNext()) {
            titanIndex = titanIndexes.next();
            if (titanIndex.isCompositeIndex()) {
                DBIndex index = new DBIndex();
                LinkedHashSet<DBProperty> dbProperties = new LinkedHashSet<>();
                index.setName(titanIndex.name());
                index.setUnique(titanIndex.isUnique());
                PropertyKey[] keys = titanIndex.getFieldKeys();
                for (PropertyKey key : keys) {
                    dbProperties.add(this.properties.get(key.name()));
                }
                index.setProperties(dbProperties);
                index.setStatus(titanIndex.getIndexStatus(keys[0]));
                this.indexes.put(index.getName(), index);
            }
        }
    }

    /**
     * Populate edge labels.
     */
    private void populateEdgeLabels() {
        TitanManagement mgmt = graph.openManagement();
        Iterable<EdgeLabel> iterable = mgmt.getRelationTypes(EdgeLabel.class);
        Iterator<EdgeLabel> titanEdgeLabels = iterable.iterator();
        EdgeLabel edgeLabel;
        while (titanEdgeLabels.hasNext()) {
            edgeLabel = titanEdgeLabels.next();
            EdgeProperty edgeProperty = new EdgeProperty();

            edgeProperty.setName(edgeLabel.name());
            edgeProperty.setMultiplicity(edgeLabel.multiplicity());

            this.edgeLabels.put(edgeProperty.getName(), edgeProperty);
        }
    }
}