namespace HeuristicLab.Problems.ProgramSynthesis.Base.Erc {
  using HeuristicLab.Common;
  using HeuristicLab.Core;
  using HeuristicLab.Data;
  using HeuristicLab.Parameters;
  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

  [StorableClass]
  public abstract class ConstantsWeightedErcValue<T, TArray> : WeightedErcValueItem<T>
    where T : struct
    where TArray : ValueTypeArray<T>, new() {

    private const string ConstantsParameterName = "Constants";
    private readonly TArray array; // perf opt: reduce parameter getter usage

    protected ConstantsWeightedErcValue(TArray array) {
      this.array = array;
      Parameters.Add(new FixedValueParameter<TArray>(ConstantsParameterName, array));
    }

    [StorableConstructor]
    protected ConstantsWeightedErcValue(bool deserializing)
      : base(deserializing) {
      array = ConstantsParameter.Value;
    }

    protected ConstantsWeightedErcValue(ConstantsWeightedErcValue<T, TArray> origin, Cloner cloner) : base(origin, cloner) {
    }

    public IValueParameter<TArray> ConstantsParameter
    {
      get { return (IValueParameter<TArray>)Parameters[ConstantsParameterName]; }
    }

    public TArray Constants
    {
      get { return ConstantsParameter.Value; }
    }

    public override T GetErcValue(IRandom random) {
      var x = random.Next(array.Length);
      return array[x];
    }
  }
}