namespace HeuristicLab.Problems.ProgramSynthesis.Push.SolutionCreator {

  using HeuristicLab.Common;
  using HeuristicLab.Core;
  using HeuristicLab.Data;
  using HeuristicLab.Encodings.IntegerVectorEncoding;
  using HeuristicLab.Parameters;
  using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
  using HeuristicLab.Problems.ProgramSynthesis.Base.Erc;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Configuration;

  /// <summary>
  /// Generates a new random integer vector with each element uniformly distributed in a specified range.
  /// </summary>
  [Item("PushSolutionCreator", "An operator which creates a new random int vector with each element uniformly distributed in a specified range and considering Push specific details")]
  [StorableClass]
  public class PushSolutionCreator : UniformRandomIntegerVectorCreator {

    private const string ERC_OPTIONS_PARAMETER_NAME = "ERC options";
    private const string MIN_LENGTH_PARAMETER_NAME = "Min. Length";
    private const string MAX_LENGTH_PARAMETER_NAME = "Max. Length";
    private const string IN_INSTRUCTION_PROBABILITY = "IN Instruction Probability";

    public PushSolutionCreator() {
      if (!Parameters.ContainsKey(ERC_OPTIONS_PARAMETER_NAME))
        Parameters.Add(new ValueParameter<ErcOptions>(ERC_OPTIONS_PARAMETER_NAME));

      if (!Parameters.ContainsKey(MIN_LENGTH_PARAMETER_NAME))
        Parameters.Add(new FixedValueParameter<IntValue>(MIN_LENGTH_PARAMETER_NAME, new IntValue(20)));

      //if (!Parameters.ContainsKey(MAX_LENGTH_PARAMETER_NAME))
      //  Parameters.Add(new FixedValueParameter<IntValue>(MAX_LENGTH_PARAMETER_NAME, new IntValue(100)));

      if (!Parameters.ContainsKey(IN_INSTRUCTION_PROBABILITY))
        Parameters.Add(new FixedValueParameter<PercentValue>(IN_INSTRUCTION_PROBABILITY, new PercentValue(0.05)));

      Parameters.Add(new ValueLookupParameter<IReadOnlyExpressionsConfiguration>("Instructions", "The enabled instructions"));
    }

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

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


    public IValueParameter<ErcOptions> ErcOptionsParameter
    {
      get { return (IValueParameter<ErcOptions>)Parameters[ERC_OPTIONS_PARAMETER_NAME]; }
    }

    public ErcOptions ErcOptions
    {
      get { return ErcOptionsParameter.Value; }
      set
      {
        ErcOptionsParameter.Value = value;
      }
    }

    public IValueParameter<IntValue> MinLengthParameter
    {
      get { return (IValueParameter<IntValue>)Parameters[MIN_LENGTH_PARAMETER_NAME]; }
    }

    public int MinLength
    {
      get { return MinLengthParameter.Value.Value; }
      set { MinLengthParameter.Value.Value = value; }
    }

    public IValueLookupParameter<IReadOnlyExpressionsConfiguration> InstructionsParameter
    {
      get { return (IValueLookupParameter<IReadOnlyExpressionsConfiguration>)Parameters["Instructions"]; }
    }

    //public IValueParameter<IntValue> MaxLengthParameter
    //{
    //  get { return LengthParameter; } //(IValueParameter<IntValue>)Parameters[MAX_LENGTH_PARAMETER_NAME]; }
    //}

    //public int MaxLength
    //{
    //  get { return MaxLengthParameter.Value.Value; }
    //  set { MaxLengthParameter.Value.Value = value; }
    //}

    public IValueParameter<PercentValue> InInstructionProbabilityParameter
    {
      get { return (IValueParameter<PercentValue>)Parameters[IN_INSTRUCTION_PROBABILITY]; }
    }

    public double InInstructionProbability
    {
      get { return InInstructionProbabilityParameter.Value.Value; }
      set { InInstructionProbabilityParameter.Value.Value = value; }
    }

    protected override IntegerVector Create(IRandom random, IntValue length, IntMatrix bounds) {
      var len = length.Value;
      var result = new IntegerVector(len);

      var contentLength = random.Next(MinLength, len);
      var lowerBound = bounds[0, 0];
      var upperBound = bounds[0, 1];
      //var inInstructionRelativeProbability = ErcOptions.ErcProbability + InInstructionProbability;
      //var instructions = InstructionsParameter.ActualValue;

      for (var i = 0; i < contentLength; i++) {
        //var x = random.NextDouble();

        //if (ErcOptions.ErcProbability > 0 && x <= ErcOptions.ErcProbability) {
        //  result[i] = PushSolutionEncoding.Erc;
        //} else if (InInstructionProbability > 0 && x <= inInstructionRelativeProbability && instructions.InExpressionCount > 0) {
        //  var index = random.Next(0, instructions.InExpressionCount);
        //  var expression = ExpressionTable.InExpressionTable[index];

        //  instructions.EnabledExpressions
        //  //result[i] = PushSolutionEncoding.In;
        //} else {
        result[i] = random.Next(lowerBound, upperBound);
        //}
      }

      if (contentLength < len) {
        result[contentLength] = PushSolutionEncoding.End;

        for (var i = contentLength + 1; i < len; i++) {
          result[i] = PushSolutionEncoding.Noop;
        }
      }

      return result;
    }
  }
}