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/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see .
 */
package org.neo4j.server.http.cypher.entity;

import java.util.function.Function;

import org.neo4j.graphdb.QueryStatistics;
import org.neo4j.values.AnyValue;
import org.neo4j.values.storable.BooleanValue;
import org.neo4j.values.storable.IntValue;
import org.neo4j.values.virtual.MapValue;

public class HttpQueryStatistics implements QueryStatistics
{
    private final int createdNodes;
    private final int deletedNodes;
    private final int createdRelationships;
    private final int deletedRelationships;
    private final int setProperties;
    private final int addedLabels;
    private final int removedLabels;
    private final int addedIndexes;
    private final int removedIndexes;
    private final int addedConstraints;
    private final int removedConstraints;
    private final int systemUpdates;
    private final boolean containsUpdates;
    private final boolean containsSystemUpdates;

    private HttpQueryStatistics( int createdNodes, int deletedNodes, int createdRelationships, int deletedRelationships, int setProperties, int addedLabels,
                                 int removedLabels, int addedIndexes, int removedIndexes, int addedConstraints, int removedConstraints, int systemUpdates,
                                 boolean containsUpdates, boolean containsSystemUpdates )
    {
        this.createdNodes = createdNodes;
        this.deletedNodes = deletedNodes;
        this.createdRelationships = createdRelationships;
        this.deletedRelationships = deletedRelationships;
        this.setProperties = setProperties;
        this.addedLabels = addedLabels;
        this.removedLabels = removedLabels;
        this.addedIndexes = addedIndexes;
        this.removedIndexes = removedIndexes;
        this.addedConstraints = addedConstraints;
        this.removedConstraints = removedConstraints;
        this.systemUpdates = systemUpdates;
        this.containsUpdates = containsUpdates;
        this.containsSystemUpdates = containsSystemUpdates;
    }

    public static QueryStatistics fromAnyValue( AnyValue anyValue )
    {
        if ( anyValue == null )
        {
            return QueryStatistics.EMPTY;
        }
        else
        {
            MapValue queryStatsMap = (MapValue) anyValue;

            return new HttpQueryStatistics( extractIntIfPresent( queryStatsMap, "nodes-created" ),
                                            extractIntIfPresent( queryStatsMap, "nodes-deleted" ),
                                            extractIntIfPresent( queryStatsMap, "relationships-created" ),
                                            extractIntIfPresent( queryStatsMap, "relationships-deleted" ),
                                            extractIntIfPresent( queryStatsMap, "properties-set" ),
                                            extractIntIfPresent( queryStatsMap, "labels-added" ),
                                            extractIntIfPresent( queryStatsMap, "labels-removed" ),
                                            extractIntIfPresent( queryStatsMap, "indexes-added" ),
                                            extractIntIfPresent( queryStatsMap, "indexes-removed" ),
                                            extractIntIfPresent( queryStatsMap, "constraints-added" ),
                                            extractIntIfPresent( queryStatsMap, "constraints-removed" ),
                                            extractIntIfPresent( queryStatsMap, "system-updates" ),
                                            extractBooleanIfPresent( queryStatsMap, "contains-updates" ),
                                            extractBooleanIfPresent( queryStatsMap, "contains-system-updates" ) );
        }
    }

    @Override
    public int getNodesCreated()
    {
        return createdNodes;
    }

    @Override
    public int getNodesDeleted()
    {
        return deletedNodes;
    }

    @Override
    public int getRelationshipsCreated()
    {
        return createdRelationships;
    }

    @Override
    public int getRelationshipsDeleted()
    {
        return deletedRelationships;
    }

    @Override
    public int getPropertiesSet()
    {
        return setProperties;
    }

    @Override
    public int getLabelsAdded()
    {
        return addedLabels;
    }

    @Override
    public int getLabelsRemoved()
    {
        return removedLabels;
    }

    @Override
    public int getIndexesAdded()
    {
        return addedIndexes;
    }

    @Override
    public int getIndexesRemoved()
    {
        return removedIndexes;
    }

    @Override
    public int getConstraintsAdded()
    {
        return addedConstraints;
    }

    @Override
    public int getConstraintsRemoved()
    {
        return removedConstraints;
    }

    @Override
    public int getSystemUpdates()
    {
        return systemUpdates;
    }

    @Override
    public boolean containsUpdates()
    {
        return containsUpdates;
    }

    @Override
    public boolean containsSystemUpdates()
    {
        return containsSystemUpdates;
    }

    private static  T extractIfPresent( MapValue queryStatsMap, String queryStatLabel, T defaultValue, Function mapperFunction )
    {
        if ( queryStatsMap.containsKey( queryStatLabel ) )
        {
            return mapperFunction.apply( queryStatsMap.get( queryStatLabel ) );
        }
        else
        {
            return defaultValue;
        }
    }

    private static int extractIntIfPresent( MapValue queryStatsMap, String queryStatLabel )
    {
        return extractIfPresent( queryStatsMap, queryStatLabel, 0, v -> ((IntValue) v).value() );
    }

    private static boolean extractBooleanIfPresent( MapValue queryStatsMap, String queryStatLabel )
    {
        return extractIfPresent( queryStatsMap, queryStatLabel, false, v -> ((BooleanValue) v).booleanValue() );
    }
}