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;
  using HeuristicLab.Problems.ProgramSynthesis.Push.Generators;

  [StorableClass]
  public class StringRandomErcValue : WeightedErcValueItem<string> {
    private readonly List<string> generatedValues = new List<string>();

    public const int DefaultStringLength = 10;

    private const string AllowLowercaseLettersParameterName = "Allow lowercase letters";
    private const string AllowUppercaseLettersParameterName = "Allow uppercase letters";
    private const string AllowSpaceParameterName = "Allow space";
    private const string SpaceProbabilityParameterName = "Space probability";
    private const string StringLengthParameterName = "String length";
    private const string AllowDigitsParameterName = "Allow digits";
    private const string AllowSymbolsParameterName = "Allow symbols";
    private const string VowelProbabilityParameterName = "Vowel probability";

    private const string NewStringProbabilityParameterName = "New string probability";
    private const string NewStringProbabilityParameterDescription = "The probability that the selection of the ephemeral random string constant for inclusion in randomly generated code will produce a new string (rather than a string that was previously generated).";

    public StringRandomErcValue() {
      Name = "String random";
      Parameters.Add(new FixedValueParameter<BoolValue>(AllowLowercaseLettersParameterName, new BoolValue(true)));
      Parameters.Add(new FixedValueParameter<BoolValue>(AllowUppercaseLettersParameterName, new BoolValue(true)));
      Parameters.Add(new FixedValueParameter<BoolValue>(AllowDigitsParameterName, new BoolValue(true)));
      Parameters.Add(new FixedValueParameter<BoolValue>(AllowSymbolsParameterName, new BoolValue(true)));
      Parameters.Add(new FixedValueParameter<BoolValue>(AllowSpaceParameterName, new BoolValue(false)));
      Parameters.Add(new FixedValueParameter<IntValue>(StringLengthParameterName, new IntValue(DefaultStringLength)));
      Parameters.Add(new FixedValueParameter<PercentValue>(SpaceProbabilityParameterName));
      Parameters.Add(new FixedValueParameter<PercentValue>(VowelProbabilityParameterName));
      Parameters.Add(new FixedValueParameter<PercentValue>(NewStringProbabilityParameterName, NewStringProbabilityParameterDescription));
    }

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

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

    public override string GetErcValue(IRandom random) {
      if (random.NextDouble().IsAlmost(NewStringProbability) || generatedValues.Count == 0) {
        var value = StringGenerator.RandomString(
          AllowLowercaseLetters,
          AllowUppercaseLetters,
          AllowSpace,
          SpaceProbability,
          StringLength,
          random);

        generatedValues.Add(value);
        return value;
      }

      var idx = random.Next(generatedValues.Count);
      return generatedValues[idx];
    }

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

    public IValueParameter<BoolValue> AllowLowercaseLettersParameter
    {
      get { return (IValueParameter<BoolValue>)Parameters[AllowLowercaseLettersParameterName]; }
    }

    public bool AllowLowercaseLetters
    {
      get { return AllowLowercaseLettersParameter.Value.Value; }
      set { AllowLowercaseLettersParameter.Value.Value = value; }
    }

    public IValueParameter<BoolValue> AllowUppercaseLettersParameter
    {
      get { return (IValueParameter<BoolValue>)Parameters[AllowUppercaseLettersParameterName]; }
    }

    public bool AllowUppercaseLetters
    {
      get { return AllowUppercaseLettersParameter.Value.Value; }
      set { AllowUppercaseLettersParameter.Value.Value = value; }
    }

    public IValueParameter<BoolValue> AllowDigitsParameter
    {
      get { return (IValueParameter<BoolValue>)Parameters[AllowDigitsParameterName]; }
    }

    public bool AllowDigits
    {
      get { return AllowDigitsParameter.Value.Value; }
      set { AllowDigitsParameter.Value.Value = value; }
    }

    public IValueParameter<BoolValue> AllowSymbolsParameter
    {
      get { return (IValueParameter<BoolValue>)Parameters[AllowSymbolsParameterName]; }
    }

    public bool AllowSymbols
    {
      get { return AllowSymbolsParameter.Value.Value; }
      set { AllowSymbolsParameter.Value.Value = value; }
    }

    public IValueParameter<BoolValue> AllowSpaceParameter
    {
      get { return (IValueParameter<BoolValue>)Parameters[AllowSpaceParameterName]; }
    }

    public bool AllowSpace
    {
      get { return AllowSpaceParameter.Value.Value; }
      set { AllowSpaceParameter.Value.Value = value; }
    }

    public IValueParameter<PercentValue> SpaceProbabilityParameter
    {
      get { return (IValueParameter<PercentValue>)Parameters[SpaceProbabilityParameterName]; }
    }

    public double SpaceProbability
    {
      get { return SpaceProbabilityParameter.Value.Value; }
      set { SpaceProbabilityParameter.Value.Value = value; }
    }

    public IValueParameter<PercentValue> VowelProbabilityParameter
    {
      get { return (IValueParameter<PercentValue>)Parameters[VowelProbabilityParameterName]; }
    }

    public double VowelProbability
    {
      get { return VowelProbabilityParameter.Value.Value; }
      set { VowelProbabilityParameter.Value.Value = value; }
    }

    public IValueParameter<IntValue> StringLengthParameter
    {
      get { return (IValueParameter<IntValue>)Parameters[StringLengthParameterName]; }
    }

    public IValueParameter<PercentValue> NewStringProbabilityParameter
    {
      get { return (IValueParameter<PercentValue>)Parameters[NewStringProbabilityParameterName]; }
    }

    public double NewStringProbability
    {
      get { return NewStringProbabilityParameter.Value.Value; }
      set { NewStringProbabilityParameter.Value.Value = value; }
    }

    public int StringLength
    {
      get { return StringLengthParameter.Value.Value; }
      set { StringLengthParameter.Value.Value = value; }
    }
  }
}