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

namespace HeuristicLab.Problems.MetaOptimization {
  // todo: storable, name, descr, ...
  [StorableClass]
  public class ParameterConfigurationTree : ValueConfiguration, IEnumerable {

    [Storable]
    private DoubleValue averageQualityNormalized;
    public DoubleValue AverageQualityNormalized {
      get { return averageQualityNormalized; }
      set {
        if (averageQualityNormalized != value) {
          averageQualityNormalized = value;
          OnQualityChanged();
        }
      }
    }

    [Storable]
    private DoubleArray qualitiesNormalized;
    public DoubleArray QualitiesNormalized {
      get { return qualitiesNormalized; }
      set {
        if (qualitiesNormalized != value) {
          qualitiesNormalized = value;
        }
      }
    }

    [Storable]
    private DoubleArray bestQualities;
    public DoubleArray BestQualities {
      get { return bestQualities; }
      set {
        if (bestQualities != value) {
          bestQualities = value;
        }
      }
    }

    [Storable]
    private DoubleArray averageQualities;
    public DoubleArray AverageQualities {
      get { return averageQualities; }
      set { averageQualities = value; }
    }

    [Storable]
    private DoubleArray worstQualities;
    public DoubleArray WorstQualities {
      get { return worstQualities; }
      set { worstQualities = value; }
    }

    [Storable]
    private DoubleArray qualityVariances;
    public DoubleArray QualityVariances {
      get { return qualityVariances; }
      set { qualityVariances = value; }
    }

    [Storable]
    private DoubleArray qualityStandardDeviations;
    public DoubleArray QualityStandardDeviations {
      get { return qualityStandardDeviations; }
      set { qualityStandardDeviations = value; }
    }

    [Storable]
    private ItemList<TimeSpanValue> averageExecutionTimes;
    public ItemList<TimeSpanValue> AverageExecutionTimes {
      get { return averageExecutionTimes; }
      set { averageExecutionTimes = value; }
    }

    [Storable]
    private IntValue repetitions;
    public IntValue Repetitions {
      get { return repetitions; }
      set { repetitions = value; }
    }

    [Storable]
    protected RunCollection runs;
    public RunCollection Runs {
      get { return runs; }
      set { runs = value; }
    }

    [Storable]
    protected IDictionary<string, IItem> parameters;
    public IDictionary<string, IItem> Parameters {
      get { return parameters; }
      set { parameters = value; }
    }

    #region constructors and cloning
    public ParameterConfigurationTree(EngineAlgorithm algorithm)
      : base(null, algorithm.GetType()) {
      this.Optimize = true; // root must always be optimized
      this.parameters = new Dictionary<string, IItem>();

      PopulateParameterConfigurations(algorithm);
    }
    public ParameterConfigurationTree() {
    }
    [StorableConstructor]
    protected ParameterConfigurationTree(bool deserializing) : base(deserializing) { }
    protected ParameterConfigurationTree(ParameterConfigurationTree original, Cloner cloner)
      : base(original, cloner) {
      this.bestQualities = cloner.Clone(original.BestQualities);
      this.averageQualities = cloner.Clone(original.averageQualities);
      this.worstQualities = cloner.Clone(original.worstQualities);
      this.qualityStandardDeviations = cloner.Clone(original.qualityStandardDeviations);
      this.qualityVariances = cloner.Clone(original.qualityVariances);
      this.averageExecutionTimes = cloner.Clone(original.averageExecutionTimes);
      this.repetitions = cloner.Clone(original.repetitions);
      this.runs = cloner.Clone(original.runs);
      this.parameters = new Dictionary<string, IItem>();
      foreach (var p in original.parameters) {
        this.parameters.Add(p.Key, cloner.Clone(p.Value));
      }
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new ParameterConfigurationTree(this, cloner);
    }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
    }
    #endregion

    public virtual void CollectResultValues(IDictionary<string, IItem> values) {
      values.Add("RunsAverageExecutionTimes", AverageExecutionTimes);
      values.Add("Repetitions", Repetitions);
      values.Add("RunsBestQualities", BestQualities);
      values.Add("RunsAverageQualities", AverageQualities);
      values.Add("RunsWorstQualities", WorstQualities);
      values.Add("RunsQualityVariances", QualityVariances);
      values.Add("RunsQualityStandardDeviations", QualityStandardDeviations);
      values.Add("QualitiesNormalized", QualitiesNormalized);
      values.Add("AverageQualityNormalized", AverageQualityNormalized);
      values.Add("Runs", Runs);
    }

    public virtual void CollectParameterValues(IDictionary<string, IItem> values) {
      foreach (var p in parameters) {
        values.Add(p);
      }
    }

    #region Events
    public event EventHandler QualityChanged;
    private void OnQualityChanged() {
      var handler = QualityChanged;
      if (handler != null) handler(this, EventArgs.Empty);
    }

    private void Quality_ValueChanged(object sender, EventArgs e) {
      OnQualityChanged();
    }
    #endregion

    public override void Parameterize(IParameterizedItem item) {
      this.parameters.Clear();
      base.Parameterize(item);
      ((IAlgorithm)item).CollectParameterValues(this.Parameters);
    }

    public Experiment GenerateExperiment(IAlgorithm algorithm, bool createBatchRuns, int repetitions) {
      Experiment experiment = new Experiment();
      foreach (IValueConfiguration combination in this) {
        IAlgorithm clonedAlg = (IAlgorithm)algorithm.Clone();
        clonedAlg.Name = combination.ParameterInfoString;
        combination.Parameterize(clonedAlg);
        clonedAlg.StoreAlgorithmInEachRun = false;
        if (createBatchRuns) {
          BatchRun batchRun = new BatchRun(string.Format("BatchRun: {0}", combination.ParameterInfoString));
          batchRun.Algorithm = clonedAlg;
          batchRun.Repetitions = repetitions;
          experiment.Optimizers.Add(batchRun);
        } else {
          experiment.Optimizers.Add(clonedAlg);
        }
      }
      return experiment;
    }

    public Experiment GenerateExperiment(IAlgorithm algorithm) {
      return GenerateExperiment(algorithm, false, 0);
    }

    public IEnumerator GetEnumerator() {
      IEnumerator enumerator = new ParameterCombinationsEnumerator(this);
      enumerator.Reset();
      return enumerator;
    }

    public long GetCombinationCount() {
      long cnt = 0;
      foreach (var c in this) {
        cnt++;
      }
      return cnt;
    }
  }
}