package io.prometheus.client.benchmark;

import com.codahale.metrics.MetricRegistry;
import java.util.concurrent.TimeUnit;
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.runner.Runner;
import org.openjdk.jmh.runner.RunnerException;
import org.openjdk.jmh.runner.options.Options;
import org.openjdk.jmh.runner.options.OptionsBuilder;

@State(Scope.Benchmark)
public class SummaryBenchmark {

  MetricRegistry registry;
  com.codahale.metrics.Histogram codahaleHistogram;

  io.prometheus.client.Summary prometheusSimpleSummary;
  io.prometheus.client.Summary.Child prometheusSimpleSummaryChild;
  io.prometheus.client.Summary prometheusSimpleSummaryNoLabels;
  io.prometheus.client.Histogram prometheusSimpleHistogram;
  io.prometheus.client.Histogram.Child prometheusSimpleHistogramChild;
  io.prometheus.client.Histogram prometheusSimpleHistogramNoLabels;

  @Setup
  public void setup() {
    prometheusSimpleSummary =
        io.prometheus.client.Summary.build()
            .name("name")
            .help("some description..")
            .labelNames("some", "group")
            .create();
    prometheusSimpleSummaryChild = prometheusSimpleSummary.labels("test", "group");

    prometheusSimpleSummaryNoLabels =
        io.prometheus.client.Summary.build().name("name").help("some description..").create();

    prometheusSimpleHistogram =
        io.prometheus.client.Histogram.build()
            .name("name")
            .help("some description..")
            .labelNames("some", "group")
            .create();
    prometheusSimpleHistogramChild = prometheusSimpleHistogram.labels("test", "group");

    prometheusSimpleHistogramNoLabels =
        io.prometheus.client.Histogram.build().name("name").help("some description..").create();

    registry = new MetricRegistry();
    codahaleHistogram = registry.histogram("name");
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleSummaryBenchmark() {
    prometheusSimpleSummary.labels("test", "group").observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleSummaryChildBenchmark() {
    prometheusSimpleSummaryChild.observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleSummaryNoLabelsBenchmark() {
    prometheusSimpleSummaryNoLabels.observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleHistogramBenchmark() {
    prometheusSimpleHistogram.labels("test", "group").observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleHistogramChildBenchmark() {
    prometheusSimpleHistogramChild.observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void prometheusSimpleHistogramNoLabelsBenchmark() {
    prometheusSimpleHistogramNoLabels.observe(1);
  }

  @Benchmark
  @BenchmarkMode({Mode.AverageTime})
  @OutputTimeUnit(TimeUnit.NANOSECONDS)
  public void codahaleHistogramBenchmark() {
    codahaleHistogram.update(1);
  }

  public static void main(String[] args) throws RunnerException {

    Options opt =
        new OptionsBuilder()
            .include(SummaryBenchmark.class.getSimpleName())
            .warmupIterations(5)
            .measurementIterations(4)
            .threads(4)
            .forks(1)
            .build();

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