using System;
using System.Collections.Generic;
using System.Linq;
using HeuristicLab.Analysis.FitnessLandscape.DataTables;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Analysis.FitnessLandscape.Algorithms {

  [Item("RepeatedInformationAnalyzer", "Analyzes and consolidates repeated information analyses.")]
  [StorableClass]
  public class RepeatedInformationAnalyzer : SingleSuccessorOperator, IRepeatsAnalyzer {

    #region Parameters
    public ScopeTreeLookupParameter<InformationAnalysisTable> InformationsParameter {
      get { return (ScopeTreeLookupParameter<InformationAnalysisTable>)Parameters["Information"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> InformationContentValuesParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["InformationContentValue"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> PartialInformationContentValuesParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["PartialInformationContentValue"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> DensityBasinInformationValuesParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["DensityBasinInformationValue"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> InformationStabilityValuesParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["InformationStabilityValue"]; }
    }
    public ScopeTreeLookupParameter<IntValue> RegularityValuesParameter {
      get { return (ScopeTreeLookupParameter<IntValue>)Parameters["RegularityValue"]; }
    }

    public LookupParameter<ResultCollection> ResultsParameter {
      get { return (LookupParameter<ResultCollection>)Parameters["Results"]; }
    }
    #endregion

    #region Construction & Cloning
    [StorableConstructor]
    protected RepeatedInformationAnalyzer(bool deserializing) : base(deserializing) { }
    protected RepeatedInformationAnalyzer(RepeatedInformationAnalyzer original, Cloner cloner) : base(original, cloner) { }
    public RepeatedInformationAnalyzer() {
      Parameters.Add(new ScopeTreeLookupParameter<InformationAnalysisTable>("Information", "A data table that information theoretic fitness landscape characteristics"));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("InformationContentValue", "The information content H(0) at eps = 0"));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("PartialInformationContentValue", "Partial information content M(0) at eps = 0"));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("DensityBasinInformationValue", "Density Basin Information h(0) at eps = 0"));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("InformationStabilityValue", "Information Stability Value"));
      Parameters.Add(new ScopeTreeLookupParameter<IntValue>("RegularityValue", "The number of different quality differences"));
      Parameters.Add(new LookupParameter<ResultCollection>("Results", "The collection of all results of this algorithm"));
      InformationsParameter.Depth = 2;
      InformationContentValuesParameter.Depth = 2;
      PartialInformationContentValuesParameter.Depth = 2;
      DensityBasinInformationValuesParameter.Depth = 2;
      InformationStabilityValuesParameter.Depth = 2;
      RegularityValuesParameter.Depth = 2;
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new RepeatedInformationAnalyzer(this, cloner);
    }
    #endregion

    private class Entry : IComparable<Entry> {

      public double InformationContent { get; private set; }
      public double PartialInformationContent { get; private set; }
      public double DensityBasinInformation { get; private set; }
      public double Epsilon { get; private set; }

      public Entry(double epsilon, double informationContent, double partialInformationContent, double densityBasinInformation) {
        Epsilon = epsilon;
        InformationContent = informationContent;
        PartialInformationContent = partialInformationContent;
        DensityBasinInformation = densityBasinInformation;
      }

      public int CompareTo(Entry other) {
        return Epsilon.CompareTo(other.Epsilon);
      }

      public override bool Equals(object obj) {
        Entry e = obj as Entry;
        if (e == null)
          throw new NotSupportedException();
        return this.Epsilon == e.Epsilon;
      }

      public override int GetHashCode() {
        return Epsilon.GetHashCode();
      }

    }

    public override IOperation Apply() {      
      ResultCollection results = ResultsParameter.ActualValue;      
      var informationTables = InformationsParameter.ActualValue.ToList();
      List<Entry> entries = new List<Entry>();
      foreach (var t in informationTables) {
        var values = t.Rows["Quality Delta"].Values;
        var info = t.Rows["Information Content"].Values;
        var partInfo = t.Rows["Partial Information Content"].Values;
        var densBas = t.Rows["Density Basin Information"].Values;
        var eps = t.Rows["Quality Delta"].Values;
        for (int i = 0; i < info.Count; i++) {
          entries.Add(new Entry(eps[i], info[i], partInfo[i], densBas[i]));
        }
      }
      entries.Sort();
      double informationSum = 0;
      double partialInformationSum = 0;
      double densityBasinSum = 0;
      double epsilonSum = 0;
      DataRow informationRow = new DataRow("Information Content");
      DataRow partialInformationRow = new DataRow("Partial Information Content");
      DataRow densityBasinRow = new DataRow("Density Basin Information");
      DataRow epsilonRow = new DataRow("Quality Delta");
      epsilonRow.VisualProperties.SecondYAxis = true;
      int n = 0;
      foreach (var entry in entries) {
        informationSum += entry.InformationContent;
        partialInformationSum += entry.PartialInformationContent;
        densityBasinSum += entry.DensityBasinInformation;
        epsilonSum += entry.Epsilon;
        n++;
        if (n == informationTables.Count) {
          informationRow.Values.Add(informationSum/n); informationSum = 0;
          partialInformationRow.Values.Add(partialInformationSum/n); partialInformationSum = 0;
          densityBasinRow.Values.Add(densityBasinSum/n); densityBasinSum = 0;
          epsilonRow.Values.Add(epsilonSum/n); epsilonSum = 0;
          n = 0;
        }
      }
      if (n > 0) {
        informationRow.Values.Add(informationSum / n);
        partialInformationRow.Values.Add(partialInformationSum / n);
        densityBasinRow.Values.Add(densityBasinSum / n);
        epsilonRow.Values.Add(epsilonSum / n);
      }
      InformationAnalysisTable table = new InformationAnalysisTable("Avg. Information Analysis");
      table.Rows.Add(informationRow);
      table.Rows.Add(partialInformationRow);
      table.Rows.Add(densityBasinRow);
      table.Rows.Add(epsilonRow);      
      results.Remove("Information");
      results.Add(new Result("Information", table));

      results.Remove("InformationContentValue");
      results.Remove("PartialInformationContentValue");
      results.Remove("DensityBasinInformationValue");
      results.Remove("InformationStabilityValue");
      results.Add(new Result("InformationContentValue", new DoubleValue(InformationContentValuesParameter.ActualValue.Select(v => v.Value).Average())));
      results.Add(new Result("PartialInformationContentValue", new DoubleValue(PartialInformationContentValuesParameter.ActualValue.Select(v => v.Value).Average())));
      results.Add(new Result("DensityBasinInformationValue", new DoubleValue(DensityBasinInformationValuesParameter.ActualValue.Select(v => v.Value).Average())));
      results.Add(new Result("InformationStabilityValue", new DoubleValue(InformationStabilityValuesParameter.ActualValue.Select(v => v.Value).Average())));

      return base.Apply();
    }
  }
}