#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 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 HeuristicLab.Analysis;
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.Problems.DataAnalysis.Symbolic {
  [Item("SchemaCleanupOperator", "Operator which removes the schemas from the global scope after they have been evaluated.")]
  [StorableClass]
  public class DiversificationStatisticsOperator : SingleSuccessorOperator {
    private const string NumberOfChangedTreesParameterName = "NumberOfChangedTrees";
    private const string NumberOfSchemasParameterName = "NumberOfSchemas";
    private const string AverageSchemaLengthParameterName = "AverageSchemaLength";
    private const string ResultCollectionParameterName = "Results";
    private const string EvaluatedSolutionsParameterName = "EvaluatedSolutions";

    private readonly object locker = new object();

    public ILookupParameter<IntValue> NumberOfChangedTreesParameter {
      get { return (ILookupParameter<IntValue>)Parameters[NumberOfChangedTreesParameterName]; }
    }
    public ILookupParameter<IntValue> NumberOfSchemasParameter {
      get { return (ILookupParameter<IntValue>)Parameters[NumberOfSchemasParameterName]; }
    }
    public ILookupParameter<DoubleValue> AverageSchemaLengthParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters[AverageSchemaLengthParameterName]; }
    }
    public ILookupParameter<ResultCollection> ResultCollectionParameter {
      get { return (ILookupParameter<ResultCollection>)Parameters[ResultCollectionParameterName]; }
    }
    public ILookupParameter<IntValue> EvaluatedSolutionsParameter {
      get { return (ILookupParameter<IntValue>)Parameters[EvaluatedSolutionsParameterName]; }
    }

    private int evaluatedSolutionsTracker;

    public DiversificationStatisticsOperator() {
      Parameters.Add(new LookupParameter<IntValue>(NumberOfChangedTreesParameterName));
      Parameters.Add(new LookupParameter<IntValue>(NumberOfSchemasParameterName));
      Parameters.Add(new LookupParameter<DoubleValue>(AverageSchemaLengthParameterName));
      Parameters.Add(new LookupParameter<ResultCollection>(ResultCollectionParameterName));
      Parameters.Add(new LookupParameter<IntValue>(EvaluatedSolutionsParameterName));
    }

    public override void InitializeState() {
      base.InitializeState();
      evaluatedSolutionsTracker = 0;
    }

    public override void ClearState() {
      base.ClearState();
      evaluatedSolutionsTracker = 0;
    }

    protected DiversificationStatisticsOperator(DiversificationStatisticsOperator original, Cloner cloner) : base(original, cloner) { }

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

    [StorableConstructor]
    protected DiversificationStatisticsOperator(bool deserializing) : base(deserializing) { }

    public override IOperation Apply() {
      var results = ResultCollectionParameter.ActualValue;
      DataTable table;
      if (!results.ContainsKey("NumberOfChangedTrees")) {
        table = new DataTable();
        results.Add(new Result("NumberOfChangedTrees", table));
        var row = new DataRow("Changed trees") { VisualProperties = { StartIndexZero = true } };
        table.Rows.Add(row);
      }
      if (!results.ContainsKey("AverageSchemaLength")) {
        table = new DataTable();
        results.Add(new Result("AverageSchemaLength", table));
        var row = new DataRow("Average schema length") { VisualProperties = { StartIndexZero = true } };
        table.Rows.Add(row);
      }
      if (!results.ContainsKey("NumberOfSchemas")) {
        table = new DataTable();
        results.Add(new Result("NumberOfSchemas", table));
        var row = new DataRow("Number of schemas") { VisualProperties = { StartIndexZero = true } };
        table.Rows.Add(row);
      }
      if (!results.ContainsKey("EvaluatedSolutionsPerGeneration")) {
        table = new DataTable();
        results.Add(new Result("EvaluatedSolutionsPerGeneration", table));
        var row = new DataRow("Evaluated solutions") { VisualProperties = { StartIndexZero = true } };
        table.Rows.Add(row);
        row.Values.Add(0);
      }

      lock (locker) {
        // count the extra evaluations performed after diversification
        EvaluatedSolutionsParameter.ActualValue.Value += NumberOfChangedTreesParameter.ActualValue.Value;
      }

      var evaluatedSolutions = EvaluatedSolutionsParameter.ActualValue.Value;
      if (evaluatedSolutions > 0)
        evaluatedSolutions -= evaluatedSolutionsTracker;
      ((DataTable)results["NumberOfChangedTrees"].Value).Rows["Changed trees"].Values.Add(NumberOfChangedTreesParameter.ActualValue.Value);
      ((DataTable)results["AverageSchemaLength"].Value).Rows["Average schema length"].Values.Add(AverageSchemaLengthParameter.ActualValue.Value);
      ((DataTable)results["NumberOfSchemas"].Value).Rows["Number of schemas"].Values.Add(NumberOfSchemasParameter.ActualValue.Value);
      ((DataTable)results["EvaluatedSolutionsPerGeneration"].Value).Rows["Evaluated solutions"].Values.Add(evaluatedSolutions);
      evaluatedSolutionsTracker += evaluatedSolutions;

      return base.Apply();
    }
  }
}