#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2019 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.Common;
using HeuristicLab.Core;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HEAL.Attic;
using HeuristicLab.Problems.VehicleRouting.Encodings.General;
using HeuristicLab.Problems.VehicleRouting.Interfaces;

namespace HeuristicLab.Problems.VehicleRouting.Encodings.Zhu {
  [Item("ZhuCrossover", "An operator which crosses two VRP representations.")]
  [StorableType("557D7F37-14DB-4CB8-92B0-DB2BC039F36C")]
  public abstract class ZhuCrossover : VRPCrossover, IStochasticOperator, IZhuOperator {
    public ILookupParameter<IRandom> RandomParameter {
      get { return (LookupParameter<IRandom>)Parameters["Random"]; }
    }

    [StorableConstructor]
    protected ZhuCrossover(StorableConstructorFlag _) : base(_) { }

    public ZhuCrossover()
      : base() {
      Parameters.Add(new LookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic manipulation operators."));
    }

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

    protected abstract ZhuEncoding Crossover(IRandom random, ZhuEncoding parent1, ZhuEncoding parent2);

    public override IOperation InstrumentedApply() {
      ItemArray<IVRPEncoding> parents = new ItemArray<IVRPEncoding>(ParentsParameter.ActualValue.Length);
      for (int i = 0; i < ParentsParameter.ActualValue.Length; i++) {
        IVRPEncoding solution = ParentsParameter.ActualValue[i];

        if (!(solution is ZhuEncoding)) {
          parents[i] = ZhuEncoding.ConvertFrom(solution, ProblemInstance);
        } else {
          parents[i] = solution;
        }
      }
      ParentsParameter.ActualValue = parents;

      ChildParameter.ActualValue =
        Crossover(RandomParameter.ActualValue, parents[0] as ZhuEncoding, parents[1] as ZhuEncoding);

      return base.InstrumentedApply();
    }
  }
}