/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */
package org.apache.tinkerpop.benchmark.util;

import org.apache.tinkerpop.gremlin.LoadGraphWith;
import org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource;
import org.apache.tinkerpop.gremlin.structure.Graph;
import org.apache.tinkerpop.gremlin.structure.io.GraphReader;
import org.apache.tinkerpop.gremlin.structure.io.gryo.GryoReader;
import org.apache.tinkerpop.gremlin.tinkergraph.structure.TinkerGraph;

import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;

import java.io.IOException;
import java.io.InputStream;

/**
 * Read-only graph benchmarks extend {@code AbstractGraphBenchmark}.  Annotating your benchmark class with {@link LoadGraphWith}
 * will load the {@link TinkerGraph} instance with the desired data set.
 *
 * @author Ted Wilmes (http://twilmes.org)
 */
@State(Scope.Thread)
public class AbstractGraphBenchmark extends AbstractBenchmarkBase {

    private final String PATH = "/org/apache/tinkerpop/gremlin/structure/io/gryo/";

    protected Graph graph;
    protected GraphTraversalSource g;

    /**
     * Opens a new {@link TinkerGraph} instance and optionally preloads it with one of the test data sets enumerated
     * in {@link LoadGraphWith}.
     *
     * @throws IOException on failure to load graph
     */
    @Setup
    public void prepare() throws IOException {
        graph = TinkerGraph.open();
        g = graph.traversal();

        final LoadGraphWith[] loadGraphWiths = this.getClass().getAnnotationsByType(LoadGraphWith.class);
        final LoadGraphWith loadGraphWith = loadGraphWiths.length == 0 ? null : loadGraphWiths[0];
        final LoadGraphWith.GraphData loadGraphWithData = null == loadGraphWith ? null : loadGraphWith.value();

        String graphFile;
        if(loadGraphWithData != null) {
            if (loadGraphWithData.equals(LoadGraphWith.GraphData.GRATEFUL)) {
                graphFile = "grateful-dead-v3.kryo";
            } else if (loadGraphWithData.equals(LoadGraphWith.GraphData.MODERN)) {
                graphFile = "tinkerpop-modern-v3.kryo";
            } else if (loadGraphWithData.equals(LoadGraphWith.GraphData.CLASSIC)) {
                graphFile = "tinkerpop-classic-v3.kryo";
            } else if (loadGraphWithData.equals(LoadGraphWith.GraphData.CREW)) {
                graphFile = "tinkerpop-crew-v3.kryo";
            } else if (loadGraphWithData.equals(LoadGraphWith.GraphData.AIR_ROUTES)) {
                graphFile = "air-routes-v3.kryo";
            } else {
                throw new RuntimeException("Could not load graph with " + loadGraphWithData);
            }

            final GraphReader reader = GryoReader.build().create();
            try (final InputStream stream = AbstractGraphBenchmark.class.
                    getResourceAsStream(PATH + graphFile)) {
                reader.readGraph(stream, graph);
            }
        }
    }
}
