using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using HeuristicLab.Common;

namespace HeuristicLab.Algorithms.Bandits.Models {
  public class GammaModel : IModel {

    private readonly double a;
    private readonly double b;

    public GammaModel(double a = 1.0, double b = 1.0) {
      this.a = a;
      this.b = b;
    }

    public double Sample(Random random) {
      return Rand.GammaRand(random, a) * b;
    }

    public void Update(double reward) {
      throw new NotSupportedException();
    }

    public void Reset() {
      throw new NotSupportedException();
    }

    public object Clone() {
      return new GammaModel(a, b);
    }

    public override string ToString() {
      return string.Format("Gamma({0:F2},{1:F2})", a, b);
    }
  }
}