using BenchmarkDotNet.Attributes;
using HeuristicLab.Core;
using HeuristicLab.Random;

namespace HeuristicLab.Benchmarks {
  [CoreJob, ClrJob, MonoJob]
  [MinColumn, MaxColumn, MeanColumn, MedianColumn]
  public class RandomPerformance {
    private readonly IRandom mersenneTwister = new MersenneTwister(1234);
    private readonly IRandom fastRandom = new FastRandom(1234);

    [Params(1_000_000)]
    public int N { get; set; }

    [Benchmark] public double FastRandomInt() => IntPerformance(fastRandom);
    [Benchmark] public double MersenneTwisterInt() => IntPerformance(mersenneTwister);

    [Benchmark] public double FastRandomDouble() => DoublePerformance(fastRandom);
    [Benchmark] public double MersenneTwisterDouble() => DoublePerformance(mersenneTwister);

    #region helper methods
    private double IntPerformance(IRandom random) {
      double avg = 0;
      for (int i = 0; i < N; ++i) {
        avg += random.Next();
      }
      return avg;
    }

    private double DoublePerformance(IRandom random) {
      double avg = 0;
      for (int i = 0; i < N; ++i) {
        avg += random.NextDouble();
      }
      return avg;
    }
    #endregion
  }
}