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

namespace HeuristicLab.Problems.MetaOptimization {
  /// <summary>
  /// TODO 
  /// </summary>
  [Item("PMOBestSolutionHistoryAnalyzer", "")]
  [StorableClass]
  public sealed class PMOBestSolutionHistoryAnalyzer : SingleSuccessorOperator, IAnalyzer {

    public ScopeTreeLookupParameter<ParameterConfigurationTree> ParameterConfigurationParameter {
      get { return (ScopeTreeLookupParameter<ParameterConfigurationTree>)Parameters["ParameterConfigurationTree"]; }
    }
    public ScopeTreeLookupParameter<DoubleValue> QualityParameter {
      get { return (ScopeTreeLookupParameter<DoubleValue>)Parameters["Quality"]; }
    }
    public ValueLookupParameter<ResultCollection> ResultsParameter {
      get { return (ValueLookupParameter<ResultCollection>)Parameters["Results"]; }
    }
    public LookupParameter<ConstrainedItemList<IProblem>> ProblemsParameter {
      get { return (LookupParameter<ConstrainedItemList<IProblem>>)Parameters[MetaOptimizationProblem.ProblemsParameterName]; }
    }
    public LookupParameter<IntValue> GenerationsParameter {
      get { return (LookupParameter<IntValue>)Parameters["Generations"]; }
    }

    public PMOBestSolutionHistoryAnalyzer()
      : base() {
      Parameters.Add(new ScopeTreeLookupParameter<ParameterConfigurationTree>("ParameterConfigurationTree", ""));
      Parameters.Add(new ScopeTreeLookupParameter<DoubleValue>("Quality", ""));
      Parameters.Add(new ValueLookupParameter<ResultCollection>("Results", ""));
      Parameters.Add(new LookupParameter<ConstrainedItemList<IProblem>>(MetaOptimizationProblem.ProblemsParameterName));
      Parameters.Add(new LookupParameter<IntValue>("Generations", ""));
    }

    [StorableConstructor]
    private PMOBestSolutionHistoryAnalyzer(bool deserializing) : base(deserializing) { }
    private PMOBestSolutionHistoryAnalyzer(PMOBestSolutionHistoryAnalyzer original, Cloner cloner) : base(original, cloner) { }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new PMOBestSolutionHistoryAnalyzer(this, cloner);
    }

    public override IOperation Apply() {
      ItemArray<DoubleValue> qualities = QualityParameter.ActualValue;
      ResultCollection results = ResultsParameter.ActualValue;
      ItemArray<ParameterConfigurationTree> parameterTrees = ParameterConfigurationParameter.ActualValue;
      int currentGeneration = GenerationsParameter.ActualValue.Value;
      int idxBest = qualities.Select((x, index) => new { index, x.Value }).OrderBy(x => x.Value).First().index; // todo: respect Min/Max
      ParameterConfigurationTree best = parameterTrees[idxBest];

      string key = "BestSolutionHistory";
      RunCollection bestSolutionHistory;
      if (!results.ContainsKey(key)) {
        bestSolutionHistory = new RunCollection();
        results.Add(new Result(key, bestSolutionHistory));
      } else {
        bestSolutionHistory = results[key].Value as RunCollection;
      }
      if (bestSolutionHistory.Count == 0 || best.ParameterInfoString != ((StringValue)bestSolutionHistory.Last().Results["Meta.ParameterInfoString"]).Value) {
        IRun run = best.ToRun(string.Format("{0}: {1}", currentGeneration, best.ParameterInfoString));
        run.Results.Add("Meta.Generation", new IntValue(currentGeneration));
        run.Results.Add("Meta.ParameterInfoString", new StringValue(best.ParameterInfoString));
        bestSolutionHistory.Add(run);
      }

      return base.Apply();
    }
  }
}