#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
 *
 * This file is part of HeuristicLab.
 *
 * HeuristicLab is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * HeuristicLab is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
 */
#endregion

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Common.Resources;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Optimization;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Analysis {
  public enum TerminationCriterium { OnlyByTime, OnlyByEvaluations, OnlyByTarget, ByTargetAndTime, ByTargetAndEvaluations, ByTimeAndEvaluations, WhicheverHitsFirst, WhicheverHitsLast }
  /// <summary>
  /// A run in which an algorithm is executed for a certain maximum time only.
  /// </summary>
  [Item("Independent Random Restarter", "An optimizer that repeats an algorithm until either a certain target value is reached or a maximum budget is exceeded.")]
  [Creatable(CreatableAttribute.Categories.TestingAndAnalysis, Priority = 117)]
  [StorableClass]
  public sealed class IndepdentRandomRestarter : NamedItem, IOptimizer, IStorableContent, INotifyPropertyChanged {
    private const string ExecutionTimeResultName = "Execution Time";
    private const string BestQualityResultName = "BestQuality";
    private const string RandomRestartsResultName = "RandomRestarts";
    private const string EvaluatedSolutionsResultName = "EvaluatedSolutions";
    private const string EvaluatedMovesResultName = "EvaluatedMoves";
    private const string QualityPerClockResultName = "QualityPerClock";
    private const string QualityPerEvaluationsResultName = "QualityPerEvaluations";

    public string Filename { get; set; }

    #region ItemImage
    public static new Image StaticItemImage {
      get { return VSImageLibrary.Event; }
    }
    public override Image ItemImage {
      get { return (Algorithm != null) ? Algorithm.ItemImage : VSImageLibrary.ExecutableStopped; }
    }
    #endregion

    [Storable]
    private TerminationCriterium terminationCriterium;
    public TerminationCriterium TerminationCriterium {
      get { return terminationCriterium; }
      set {
        if (terminationCriterium == value) return;
        terminationCriterium = value;
        OnPropertyChanged("TerminationCriterium");
      }
    }

    [Storable]
    private TimeSpan maximumExecutionTime;
    public TimeSpan MaximumExecutionTime {
      get { return maximumExecutionTime; }
      set {
        if (maximumExecutionTime == value) return;
        maximumExecutionTime = value;
        OnPropertyChanged("MaximumExecutionTime");
      }
    }

    [Storable]
    private int maximumEvaluations;
    public int MaximumEvaluations {
      get { return maximumEvaluations; }
      set {
        if (maximumEvaluations == value) return;
        maximumEvaluations = value;
        OnPropertyChanged("MaximumEvaluations");
      }
    }

    [Storable]
    private double targetValue;
    public double TargetValue {
      get { return targetValue; }
      set {
        if (targetValue == value) return;
        targetValue = value;
        OnPropertyChanged("TargetValue");
      }
    }

    [Storable]
    private bool maximization;
    public bool Maximization {
      get { return maximization; }
      set {
        if (maximization == value) return;
        maximization = value;
        OnPropertyChanged("Maximization");
      }
    }

    [Storable]
    private double moveCostPerSolution;
    public double MoveCostPerSolution {
      get { return moveCostPerSolution; }
      set {
        if (moveCostPerSolution == value) return;
        moveCostPerSolution = value;
        perEvaluationsAnalyzer.MoveCostPerSolutionParameter.Value = new DoubleValue(moveCostPerSolution);
        OnPropertyChanged("MoveCostPerSolution");
      }
    }

    [Storable]
    private bool storeSolutionInRun;
    public bool StoreSolutionInRun {
      get { return storeSolutionInRun; }
      set {
        if (storeSolutionInRun == value) return;
        storeSolutionInRun = value;
        OnPropertyChanged("StoreSolutionInRun");
      }
    }

    [Storable]
    private QualityPerClockAnalyzer perClockAnalyzer;
    [Storable]
    private QualityPerEvaluationsAnalyzer perEvaluationsAnalyzer;

    [Storable]
    private ExecutionState executionState;
    public ExecutionState ExecutionState {
      get { return executionState; }
      private set {
        if (executionState != value) {
          executionState = value;
          OnExecutionStateChanged();
          OnItemImageChanged();
        }
      }
    }

    private TimeSpan lastAlgorithmExecutionTime;
    [Storable]
    private TimeSpan executionTime;
    public TimeSpan ExecutionTime {
      get { return executionTime; }
      set {
        if (executionTime == value) return;
        executionTime = value;
        OnPropertyChanged("ExecutionTime");
        OnExecutionTimeChanged();
      }
    }

    [Storable]
    private double evaluations;
    public double Evaluations {
      get { return evaluations; }
      set {
        if (evaluations == value) return;
        evaluations = value;
        OnPropertyChanged("Evaluations");
      }
    }

    [Storable]
    private double bestSoFar;
    public double BestSoFar {
      get { return bestSoFar; }
      set {
        if (bestSoFar == value) return;
        bestSoFar = value;
        OnPropertyChanged("BestSoFar");
      }
    }

    [Storable]
    private IRun currentRun;
    public IRun CurrentRun {
      get { return currentRun; }
      private set {
        if (currentRun == value) return;
        currentRun = value;
        OnPropertyChanged("CurrentRun");
      }
    }

    [Storable]
    private IAlgorithm algorithm;
    public IAlgorithm Algorithm {
      get { return algorithm; }
      set {
        if (algorithm == value) return;
        if (algorithm != null) {
          DeregisterAlgorithmEvents();
          RemoveAlgorithmAnalyzers();
        }
        algorithm = value;
        if (algorithm != null) {
          RegisterAlgorithmEvents();
          AddAlgorithmAnalyzers();
        }
        OnPropertyChanged("Algorithm");
        Prepare();
      }
    }

    [Storable]
    private RunCollection runs;
    public RunCollection Runs {
      get { return runs; }
      private set {
        if (value == null) throw new ArgumentNullException();
        if (runs == value) return;
        runs = value;
        OnPropertyChanged("Runs");
      }
    }

    public IEnumerable<IOptimizer> NestedOptimizers {
      get {
        if (Algorithm == null) yield break;
        yield return Algorithm;
        foreach (var opt in Algorithm.NestedOptimizers)
          yield return opt;
      }
    }

    private bool IsFinished {
      get {
        var timeHit = ExecutionTime >= MaximumExecutionTime;
        var evalHit = Evaluations >= MaximumEvaluations;
        var targetHit = (Maximization && BestSoFar >= TargetValue || !Maximization && BestSoFar <= TargetValue);

        return timeHit && evalHit && targetHit
          || timeHit && (TerminationCriterium == TerminationCriterium.OnlyByTime
                      || TerminationCriterium == TerminationCriterium.WhicheverHitsFirst
                      || TerminationCriterium == TerminationCriterium.ByTargetAndTime
                      || TerminationCriterium == TerminationCriterium.ByTimeAndEvaluations)
          || evalHit && (TerminationCriterium == TerminationCriterium.OnlyByEvaluations
                      || TerminationCriterium == TerminationCriterium.WhicheverHitsFirst
                      || TerminationCriterium == TerminationCriterium.ByTargetAndEvaluations
                      || TerminationCriterium == TerminationCriterium.ByTimeAndEvaluations)
          || targetHit && (TerminationCriterium == TerminationCriterium.OnlyByTarget
                        || TerminationCriterium == TerminationCriterium.WhicheverHitsFirst
                        || TerminationCriterium == TerminationCriterium.ByTargetAndTime
                        || TerminationCriterium == TerminationCriterium.ByTargetAndEvaluations);
      }
    }

    private ISingleObjectiveHeuristicOptimizationProblem problem;

    [StorableConstructor]
    private IndepdentRandomRestarter(bool deserializing) : base(deserializing) { }
    private IndepdentRandomRestarter(IndepdentRandomRestarter original, Cloner cloner)
      : base(original, cloner) {
      terminationCriterium = original.terminationCriterium;
      maximumExecutionTime = original.maximumExecutionTime;
      maximumEvaluations = original.maximumEvaluations;
      moveCostPerSolution = original.moveCostPerSolution;
      storeSolutionInRun = original.storeSolutionInRun;
      targetValue = original.targetValue;
      maximization = original.maximization;
      executionTime = original.executionTime;
      evaluations = original.evaluations;
      bestSoFar = original.bestSoFar;
      lastAlgorithmExecutionTime = original.lastAlgorithmExecutionTime;

      perClockAnalyzer = cloner.Clone(original.perClockAnalyzer);
      perEvaluationsAnalyzer = cloner.Clone(original.perEvaluationsAnalyzer);

      algorithm = cloner.Clone(original.algorithm);
      runs = cloner.Clone(original.runs);

      ExecutionState = original.ExecutionState;

      Initialize();
    }
    public IndepdentRandomRestarter()
      : base() {
      name = ItemName;
      description = ItemDescription;
      terminationCriterium = TerminationCriterium.ByTargetAndEvaluations;
      maximumExecutionTime = TimeSpan.FromMinutes(1);
      maximumEvaluations = 10000000; // 10 mio
      moveCostPerSolution = 1;
      storeSolutionInRun = false;
      targetValue = 0;
      maximization = false;
      executionTime = TimeSpan.Zero;
      evaluations = 0;
      bestSoFar = double.NaN;
      lastAlgorithmExecutionTime = TimeSpan.Zero;

      perClockAnalyzer = new QualityPerClockAnalyzer();
      perEvaluationsAnalyzer = new QualityPerEvaluationsAnalyzer();

      Runs = new RunCollection { OptimizerName = Name };
      Initialize();
    }
    public IndepdentRandomRestarter(string name)
      : base(name) {
      description = ItemDescription;
      terminationCriterium = TerminationCriterium.ByTargetAndEvaluations;
      maximumExecutionTime = TimeSpan.FromMinutes(1);
      maximumEvaluations = 10000000; // 10 mio
      moveCostPerSolution = 1;
      storeSolutionInRun = false;
      targetValue = 0;
      maximization = false;
      executionTime = TimeSpan.Zero;
      evaluations = 0;
      bestSoFar = double.NaN;
      lastAlgorithmExecutionTime = TimeSpan.Zero;

      perClockAnalyzer = new QualityPerClockAnalyzer();
      perEvaluationsAnalyzer = new QualityPerEvaluationsAnalyzer();

      Runs = new RunCollection { OptimizerName = Name };
      Initialize();
    }
    public IndepdentRandomRestarter(string name, string description)
      : base(name, description) {
      terminationCriterium = TerminationCriterium.ByTargetAndEvaluations;
      maximumExecutionTime = TimeSpan.FromMinutes(1);
      maximumEvaluations = 10000000; // 10 mio
      moveCostPerSolution = 1;
      storeSolutionInRun = false;
      targetValue = 0;
      maximization = false;
      executionTime = TimeSpan.Zero;
      evaluations = 0;
      bestSoFar = double.NaN;
      lastAlgorithmExecutionTime = TimeSpan.Zero;

      perClockAnalyzer = new QualityPerClockAnalyzer();
      perEvaluationsAnalyzer = new QualityPerEvaluationsAnalyzer();

      Runs = new RunCollection { OptimizerName = Name };
      Initialize();
    }

    public override IDeepCloneable Clone(Cloner cloner) {
      if (ExecutionState == ExecutionState.Started) throw new InvalidOperationException(string.Format("Clone not allowed in execution state \"{0}\".", ExecutionState));
      return new IndepdentRandomRestarter(this, cloner);
    }

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      Initialize();
    }

    private void Initialize() {
      if (algorithm != null) RegisterAlgorithmEvents();
    }

    private void Reset() {
      ExecutionTime = TimeSpan.Zero;
      Evaluations = 0;
      BestSoFar = double.NaN;
      lastAlgorithmExecutionTime = TimeSpan.Zero;

      CurrentRun = null;
    }

    public void Prepare() {
      Prepare(false);
    }
    public void Prepare(bool clearRuns) {
      if ((ExecutionState != ExecutionState.Prepared) && (ExecutionState != ExecutionState.Paused) && (ExecutionState != ExecutionState.Stopped))
        throw new InvalidOperationException(string.Format("Prepare not allowed in execution state \"{0}\".", ExecutionState));
      Reset();

      if (Algorithm != null) {
        Algorithm.Prepare(clearRuns);
        ExecutionState = ExecutionState.Prepared;
        OnPrepared();
      }
    }
    public void Start() {
      if ((ExecutionState != ExecutionState.Prepared) && (ExecutionState != ExecutionState.Paused))
        throw new InvalidOperationException(string.Format("Start not allowed in execution state \"{0}\".", ExecutionState));

      if (ExecutionState == ExecutionState.Prepared) {
        CurrentRun = new Run(Algorithm) {
          Name = Algorithm.Name + " IRRRun" + Runs.Count
        };
        if (!CurrentRun.Results.ContainsKey(ExecutionTimeResultName))
          CurrentRun.Results.Add(ExecutionTimeResultName, new TimeSpanValue(TimeSpan.Zero));
        // use double instead of int, otherwise one might run into int.MaxValue (at least with moves)
        CurrentRun.Results.Add(EvaluatedSolutionsResultName, new DoubleValue(0));
        CurrentRun.Results.Add(EvaluatedMovesResultName, new DoubleValue(0));
        CurrentRun.Results.Add(BestQualityResultName, new DoubleValue(Maximization ? double.MinValue : double.MaxValue));
        CurrentRun.Results.Add(RandomRestartsResultName, new IntValue(0));
      }
      if (Algorithm.ExecutionState == ExecutionState.Stopped)
        Algorithm.Prepare(true);
      Algorithm.Start();
      ExecutionState = ExecutionState.Started;
      OnStarted();
    }
    public void Pause() {
      if (ExecutionState != ExecutionState.Started)
        throw new InvalidOperationException(string.Format("Pause not allowed in execution state \"{0}\".", ExecutionState));
      Algorithm.Pause();
      ExecutionState = ExecutionState.Paused;
      OnPaused();
    }

    private bool forceStop = false;
    public void Stop() {
      if ((ExecutionState != ExecutionState.Started) && (ExecutionState != ExecutionState.Paused))
        throw new InvalidOperationException(string.Format("Stop not allowed in execution state \"{0}\".", ExecutionState));
      forceStop = true;
      try {
        Algorithm.Stop();
      } catch (InvalidOperationException) {
        // sometimes we hit the algorithm in an invalid state
      }
    }

    private void AddAlgorithmAnalyzers() {
      if (!Algorithm.Parameters.ContainsKey("Analyzer")) return;
      var analyzerParam = Algorithm.Parameters["Analyzer"] as IValueParameter<MultiAnalyzer>;
      if (analyzerParam == null) return;
      if (!analyzerParam.Value.Operators.Contains(perClockAnalyzer))
        analyzerParam.Value.Operators.Add(perClockAnalyzer);
      if (!analyzerParam.Value.Operators.Contains(perEvaluationsAnalyzer))
        analyzerParam.Value.Operators.Add(perEvaluationsAnalyzer);
    }

    private void RemoveAlgorithmAnalyzers() {
      if (!Algorithm.Parameters.ContainsKey("Analyzer")) return;
      var analyzerParam = Algorithm.Parameters["Analyzer"] as IValueParameter<MultiAnalyzer>;
      if (analyzerParam == null) return;
      analyzerParam.Value.Operators.Remove(perClockAnalyzer);
      analyzerParam.Value.Operators.Remove(perEvaluationsAnalyzer);
    }

    #region Events
    protected override void OnNameChanged() {
      base.OnNameChanged();
      runs.OptimizerName = Name;
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string property) {
      var handler = PropertyChanged;
      if (handler != null) handler(this, new PropertyChangedEventArgs(property));
    }

    #region IExecutable Events
    public event EventHandler ExecutionStateChanged;
    private void OnExecutionStateChanged() {
      var handler = ExecutionStateChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler ExecutionTimeChanged;
    private void OnExecutionTimeChanged() {
      var handler = ExecutionTimeChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Prepared;
    private void OnPrepared() {
      var handler = Prepared;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Started;
    private void OnStarted() {
      var handler = Started;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Paused;
    private void OnPaused() {
      var handler = Paused;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler Stopped;
    private void OnStopped() {
      var handler = Stopped;
      if (handler != null) handler(this, EventArgs.Empty);
    }
    public event EventHandler<EventArgs<Exception>> ExceptionOccurred;
    private void OnExceptionOccurred(Exception exception) {
      var handler = ExceptionOccurred;
      if (handler != null) handler(this, new EventArgs<Exception>(exception));
    }
    #endregion

    #region Algorithm Events
    private void RegisterAlgorithmEvents() {
      algorithm.ExceptionOccurred += Algorithm_ExceptionOccurred;
      algorithm.ExecutionTimeChanged += Algorithm_ExecutionTimeChanged;
      algorithm.Paused += Algorithm_Paused;
      algorithm.Prepared += Algorithm_Prepared;
      algorithm.Stopped += Algorithm_Stopped;
      algorithm.ProblemChanged += Algorithm_ProblemChanged;
      Algorithm_ProblemChanged(algorithm, EventArgs.Empty);
    }
    private void DeregisterAlgorithmEvents() {
      algorithm.ExceptionOccurred -= Algorithm_ExceptionOccurred;
      algorithm.ExecutionTimeChanged -= Algorithm_ExecutionTimeChanged;
      algorithm.Paused -= Algorithm_Paused;
      algorithm.Prepared -= Algorithm_Prepared;
      algorithm.Stopped -= Algorithm_Stopped;
      algorithm.ProblemChanged -= Algorithm_ProblemChanged;
    }
    private void Algorithm_ExceptionOccurred(object sender, EventArgs<Exception> e) {
      OnExceptionOccurred(e.Value);
    }
    private void Algorithm_ExecutionTimeChanged(object sender, EventArgs e) {
      ExecutionTime += Algorithm.ExecutionTime - lastAlgorithmExecutionTime;
      lastAlgorithmExecutionTime = Algorithm.ExecutionTime;
    }
    private void Algorithm_Paused(object sender, EventArgs e) {
      ExecutionTime += Algorithm.ExecutionTime - lastAlgorithmExecutionTime;
      lastAlgorithmExecutionTime = Algorithm.ExecutionTime;
      OnPaused();
    }
    private void Algorithm_Prepared(object sender, EventArgs e) {
      lastAlgorithmExecutionTime = TimeSpan.Zero;
    }
    private void Algorithm_Stopped(object sender, EventArgs e) {
      ExecutionTime += Algorithm.ExecutionTime - lastAlgorithmExecutionTime;
      lastAlgorithmExecutionTime = Algorithm.ExecutionTime;

      var execTime = ((TimeSpanValue)CurrentRun.Results[ExecutionTimeResultName]).Value;
      var solEvals = ((DoubleValue)CurrentRun.Results[EvaluatedSolutionsResultName]).Value;
      var movEvals = ((DoubleValue)CurrentRun.Results[EvaluatedMovesResultName]).Value;
      var restarts = ((IntValue)CurrentRun.Results[RandomRestartsResultName]).Value;
      var improvement = false;

      IResult result;
      if (Algorithm.Results.TryGetValue(perEvaluationsAnalyzer.EvaluatedSolutionsParameter.ActualName, out result)) {
        var evals = ((IntValue)result.Value).Value;
        Evaluations += evals;
        CurrentRun.Results[EvaluatedSolutionsResultName] = new DoubleValue(solEvals + evals);
      }
      if (Algorithm.Results.TryGetValue(perEvaluationsAnalyzer.EvaluatedMovesParameter.ActualName, out result)) {
        var evals = ((IntValue)result.Value).Value;
        Evaluations += moveCostPerSolution * evals;
        CurrentRun.Results[EvaluatedMovesResultName] = new DoubleValue(movEvals + evals);
      }
      if (Algorithm.Results.TryGetValue(perEvaluationsAnalyzer.BestQualityParameter.ActualName, out result)) {
        var bestQuality = ((DoubleValue)result.Value).Value;
        if (double.IsNaN(BestSoFar)
            || Maximization && bestQuality > BestSoFar
            || !Maximization && bestQuality < BestSoFar) {
          BestSoFar = bestQuality;
          CurrentRun.Results[BestQualityResultName] = new DoubleValue(bestQuality);
          improvement = true;
        }
      }
      if (Algorithm.Results.TryGetValue(perClockAnalyzer.QualityPerClockParameter.ResultName, out result)) {
        UpdateQualityPerClockResult((IndexedDataTable<double>)result.Value, execTime, restarts);
      }
      if (Algorithm.Results.TryGetValue(perEvaluationsAnalyzer.QualityPerEvaluationsParameter.ResultName, out result)) {
        UpdateQualityPerEvaluationsResult((IndexedDataTable<double>)result.Value, solEvals, movEvals, restarts);
      }
      if (StoreSolutionInRun) {
        foreach (var r in Algorithm.Results) {
          if (r.Name.ToLower().EndsWith("solution") && improvement) {
            CurrentRun.Results[r.Name] = (IItem)r.Value.Clone();
          }
        }
      }

      CurrentRun.Results[ExecutionTimeResultName] = new TimeSpanValue(execTime + Algorithm.ExecutionTime);

      // Algorithm sets ExecutionTime to zero before firing Prepared
      // We will thus see ExecutionTimeChanged before Prepared
      lastAlgorithmExecutionTime = TimeSpan.Zero;

      if (!forceStop && !IsFinished) {
        CurrentRun.Results[RandomRestartsResultName] = new IntValue(restarts + 1);
        Algorithm.Prepare(true);
        Algorithm.Start();
      } else {
        forceStop = false;
        Runs.Add(CurrentRun);
        Algorithm.Prepare(true);
        ExecutionState = ExecutionState.Stopped;
        OnStopped();
      }
    }

    private void UpdateQualityPerClockResult(IndexedDataTable<double> perClock, TimeSpan execTime, int restarts) {
      IndexedDataTable<double> dt;
      if (!CurrentRun.Results.ContainsKey(QualityPerClockResultName)) {
        dt = (IndexedDataTable<double>)perClock.Clone();
        if (!dt.Rows.ContainsKey("Restarts"))
          dt.Rows.Add(new IndexedDataRow<double>("Restarts") {
            VisualProperties = {
              ChartType = DataRowVisualProperties.DataRowChartType.StepLine,
              SecondYAxis = true
            }
          });
        foreach (var v in dt.Rows.First().Values)
          dt.Rows["Restarts"].Values.Add(Tuple.Create(v.Item1, 0.0));
        CurrentRun.Results.Add(QualityPerClockResultName, dt);
      } else {
        dt = (IndexedDataTable<double>)CurrentRun.Results[QualityPerClockResultName];
        var best = dt.Rows.First().Values.Last().Item2;
        foreach (var tupl in perClock.Rows.First().Values) {
          if (Maximization && tupl.Item2 > best || !Maximization && tupl.Item2 < best) {
            dt.Rows.First().Values.Add(Tuple.Create(execTime.TotalSeconds + tupl.Item1, tupl.Item2));
            dt.Rows["Restarts"].Values.Add(Tuple.Create(execTime.TotalSeconds + tupl.Item1, (double)restarts));
            best = tupl.Item2;
          }
        }
      }
      if (IsFinished) {
        dt.Rows.First().Values.Add(Tuple.Create(ExecutionTime.TotalSeconds, BestSoFar));
        dt.Rows["Restarts"].Values.Add(Tuple.Create(ExecutionTime.TotalSeconds, (double)restarts));
      }
    }

    private void UpdateQualityPerEvaluationsResult(IndexedDataTable<double> perEvaluations, double solEvals, double movEvals, int restarts) {
      IndexedDataTable<double> dt;
      if (!CurrentRun.Results.ContainsKey(QualityPerEvaluationsResultName)) {
        dt = (IndexedDataTable<double>)perEvaluations.Clone();
        if (!dt.Rows.ContainsKey("Restarts"))
          dt.Rows.Add(new IndexedDataRow<double>("Restarts") {
            VisualProperties = {
              ChartType = DataRowVisualProperties.DataRowChartType.StepLine,
              SecondYAxis = true
            }
          });
        foreach (var v in dt.Rows.First().Values)
          dt.Rows["Restarts"].Values.Add(Tuple.Create(v.Item1, 0.0));
        CurrentRun.Results.Add(QualityPerEvaluationsResultName, dt);
      } else {
        dt = (IndexedDataTable<double>)CurrentRun.Results[QualityPerEvaluationsResultName];
        var best = dt.Rows.First().Values.Last().Item2;
        foreach (var tupl in perEvaluations.Rows.First().Values) {
          if (Maximization && tupl.Item2 > best || !Maximization && tupl.Item2 < best) {
            dt.Rows.First().Values.Add(Tuple.Create(solEvals + moveCostPerSolution * movEvals + tupl.Item1, tupl.Item2));
            dt.Rows["Restarts"].Values.Add(Tuple.Create(solEvals + moveCostPerSolution * movEvals + tupl.Item1, (double)restarts));
            best = tupl.Item2;
          }
        }
      }
      if (IsFinished) {
        dt.Rows.First().Values.Add(Tuple.Create(Evaluations, BestSoFar));
        dt.Rows["Restarts"].Values.Add(Tuple.Create(Evaluations, (double)restarts));
      }
    }

    private void Algorithm_ProblemChanged(object sender, EventArgs e) {
      if (problem != null) DeregisterProblemEvents();

      problem = Algorithm.Problem as ISingleObjectiveHeuristicOptimizationProblem;
      if (problem == null) return;
      RegisterProblemEvents();

      AddAlgorithmAnalyzers();

      var maxParam = problem.MaximizationParameter as IValueParameter<BoolValue>;
      if (maxParam != null)
        Maximization = maxParam.Value.Value;
      var bkParam = problem.BestKnownQualityParameter as IValueParameter<DoubleValue>;
      if (bkParam != null && bkParam.Value != null)
        TargetValue = bkParam.Value.Value;

      Reset();
    }

    private void RegisterProblemEvents() {
      problem.Reset += ProblemOnReset;
      problem.OperatorsChanged += ProblemOnOperatorsChanged;
    }

    private void DeregisterProblemEvents() {
      problem.Reset -= ProblemOnReset;
      problem.OperatorsChanged -= ProblemOnOperatorsChanged;
    }

    private void ProblemOnReset(object sender, EventArgs eventArgs) {
      AddAlgorithmAnalyzers();
    }

    private void ProblemOnOperatorsChanged(object sender, EventArgs eventArgs) {
      AddAlgorithmAnalyzers();
    }
    #endregion
    #endregion
  }
}