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/**
 * 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.pinot.perf;

import java.io.File;
import java.io.IOException;
import java.util.Arrays;
import java.util.concurrent.TimeUnit;
import org.apache.commons.io.FileUtils;
import org.apache.pinot.segment.local.segment.creator.impl.SegmentDictionaryCreator;
import org.apache.pinot.spi.data.DimensionFieldSpec;
import org.apache.pinot.spi.data.FieldSpec;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.TearDown;
import org.openjdk.jmh.runner.Runner;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;
import org.openjdk.jmh.runner.options.TimeValue;


@State(Scope.Benchmark)
public class BenchmarkDictionaryCreation {
  private static final FieldSpec INT_FIELD = new DimensionFieldSpec("int", FieldSpec.DataType.INT, true);
  private static final FieldSpec LONG_FIELD = new DimensionFieldSpec("long", FieldSpec.DataType.LONG, true);
  private static final FieldSpec FLOAT_FIELD = new DimensionFieldSpec("float", FieldSpec.DataType.FLOAT, true);
  private static final FieldSpec DOUBLE_FIELD = new DimensionFieldSpec("double", FieldSpec.DataType.DOUBLE, true);
  private static final FieldSpec STRING_FIELD = new DimensionFieldSpec("string", FieldSpec.DataType.STRING, true);
  private static final int CARDINALITY = 1_000_000;
  private static final File INDEX_DIR = new File(FileUtils.getTempDirectory(), "BenchmarkDictionaryCreation");

  private final int[] _sortedInts = new int[CARDINALITY];
  private final long[] _sortedLongs = new long[CARDINALITY];
  private final float[] _sortedFloats = new float[CARDINALITY];
  private final double[] _sortedDoubles = new double[CARDINALITY];
  private final String[] _sortedStrings = new String[CARDINALITY];

  @Setup
  public void setUp()
      throws IOException {
    FileUtils.forceMkdir(INDEX_DIR);
    for (int i = 0; i < CARDINALITY; i++) {
      _sortedInts[i] = i;
      _sortedLongs[i] = i;
      _sortedFloats[i] = i;
      _sortedDoubles[i] = i;
      _sortedStrings[i] = String.valueOf(i);
    }
    Arrays.sort(_sortedStrings);
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkIntDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(INT_FIELD, INDEX_DIR)) {
      dictionaryCreator.build(_sortedInts);
      return dictionaryCreator.indexOfSV(0);
    }
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkLongDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(LONG_FIELD, INDEX_DIR)) {
      dictionaryCreator.build(_sortedLongs);
      return dictionaryCreator.indexOfSV(0L);
    }
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkFloatDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(FLOAT_FIELD, INDEX_DIR)) {
      dictionaryCreator.build(_sortedFloats);
      return dictionaryCreator.indexOfSV(0f);
    }
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkDoubleDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(DOUBLE_FIELD, INDEX_DIR)) {
      dictionaryCreator.build(_sortedDoubles);
      return dictionaryCreator.indexOfSV(0d);
    }
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkStringDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(STRING_FIELD, INDEX_DIR)) {
      dictionaryCreator.build(_sortedStrings);
      return dictionaryCreator.indexOfSV("0");
    }
  }

  @Benchmark
  @BenchmarkMode(Mode.SampleTime)
  @OutputTimeUnit(TimeUnit.MILLISECONDS)
  public int benchmarkVarLengthStringDictionaryCreation()
      throws IOException {
    try (SegmentDictionaryCreator dictionaryCreator = new SegmentDictionaryCreator(STRING_FIELD, INDEX_DIR, true)) {
      dictionaryCreator.build(_sortedStrings);
      return dictionaryCreator.indexOfSV("0");
    }
  }

  @TearDown
  public void tearDown()
      throws Exception {
    FileUtils.forceDelete(INDEX_DIR);
  }

  public static void main(String[] args)
      throws Exception {
    Options opt =
        new OptionsBuilder().include(BenchmarkDictionaryCreation.class.getSimpleName()).warmupTime(TimeValue.seconds(5))
            .warmupIterations(2).measurementTime(TimeValue.seconds(5)).measurementIterations(3).forks(1).build();

    new Runner(opt).run();
  }
}