#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 System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.EvolutionTracking;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
  [StorableClass]
  [Item("SymbolicDataAnalysisExpressionBeforeCrossoverOperator", "An operator which runs before crossover and enables the tracking of genetic fragments.")]
  public class SymbolicDataAnalysisExpressionBeforeCrossoverOperator : BeforeCrossoverOperator<ISymbolicExpressionTree> {
    public SymbolicDataAnalysisExpressionBeforeCrossoverOperator() { }

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

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

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

    public override IOperation Apply() {
      var result = base.Apply(); // the base operator will add the child to the graph before the actual crossover operation takes place
      var parents = ParentsParameter.ActualValue.ToList();
      var childVertex = GenealogyGraph.GetByContent(parents[0]); // use the parent since it is actually the child before crossover (and the ChildParameter doesn't have a value yet)
      var arcs = childVertex.InArcs.ToList();

      for (int i = 0; i < parents.Count; ++i) {
        arcs[i].Data = parents[i].IterateNodesPrefix().ToCloneableCollection();
      }

      return result;
    }
  }
}