namespace HeuristicLab.Problems.ProgramSynthesis.Base.Erc.String {
  using System.Collections.Generic;

  using HeuristicLab.Common;
  using HeuristicLab.Core;
  using HeuristicLab.Data;
  using HeuristicLab.Parameters;
  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

  [StorableClass]
  public class StringConstantErcValue : WeightedErcValueItem<string> {

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

    public StringConstantErcValue() : this(new string[0]) { }

    public StringConstantErcValue(params string[] constants) {
      array = new StringArray(constants);
      Parameters.Add(new FixedValueParameter<StringArray>(ConstantsParameterName, array));
    }

    [StorableConstructor]
    public StringConstantErcValue(bool deserializing) : base(deserializing) {
    }

    public StringConstantErcValue(StringConstantErcValue origin, Cloner cloner) : base(origin, cloner) {
    }

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

    public IEnumerable<string> Constants
    {
      get { return ConstantsParameter.Value; }
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      return new StringConstantErcValue(this, cloner);
    }

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