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/**
 * Copyright 2014 Jason Ruckman
 *
 * 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.
 */
package com.github.jasonruckman.sidney.benchmarking.random;

import com.github.jasonruckman.sidney.benchmarking.BenchmarkingBase;
import com.github.jasonruckman.sidney.core.io.float32.Float32Decoder;
import com.github.jasonruckman.sidney.core.io.float32.Float32Encoder;
import com.github.jasonruckman.sidney.core.io.float32.Plain;
import com.github.jasonruckman.sidney.core.io.float32.RLE;
import org.openjdk.jmh.annotations.*;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.Random;

@State(Scope.Benchmark)
@Warmup(iterations = 10)
@Measurement(iterations = 2)
@Threads(1)
@Fork(1)
public class Float32EncoderBenchmarks extends BenchmarkingBase {
  private final int num = 65536;
  private final float[] floats;

  public Float32EncoderBenchmarks() {
    floats = new float[num];
    Random random = new Random(11L);
    for (int i = 0; i < floats.length; i++) {
      floats[i] = random.nextFloat();
    }
  }

  @Benchmark
  @Group("float32Encoders")
  public float[] plain() throws IOException {
    return run(getEncoder(Plain.PlainFloat32Encoder.class), getDecoder(Plain.PlainFloat32Decoder.class));
  }

  @Benchmark
  @Group("float32Encoders")
  public float[] rle() throws IOException {
    return run(getEncoder(RLE.RLEFloat32Encoder.class), getDecoder(RLE.RLEFloat32Decoder.class));
  }

  private float[] run(Float32Encoder encoder, Float32Decoder decoder) throws IOException {
    for (float i : floats) {
      encoder.writeFloat(i);
    }
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    encoder.writeToStream(baos);
    encoder.reset();
    decoder.readFromStream(new ByteArrayInputStream(baos.toByteArray()));
    return decoder.nextFloats(num);
  }
}