#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2015 Joseph Helm and 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 HeuristicLab.Operators;
using HeuristicLab.Core;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using HeuristicLab.Common;
using HeuristicLab.Data;
using HeuristicLab.Parameters;


namespace HeuristicLab.Problems.BinPacking {
  [Item("Bin Packing Evaluator (with decoder)", "Represents a composition of a decoder and an evaluator for bin-packing problems.")]
  [StorableClass]
  public class DecodingEvaluator<E, D, B, I> : SingleSuccessorOperator, IDecodingEvaluator
    where E : Item //E defines the used Encoding
    where D : class, IPackingPosition
    where B : PackingShape<D>
    where I : PackingShape<D>, IPackingItem {

    public IValueLookupParameter<IPackingSolutionDecoder> PackingSolutionDecoderParameter {
      get { return (IValueLookupParameter<IPackingSolutionDecoder>)Parameters["PackingSolutionDecoder"]; }
    }
    ILookupParameter<IPackingSolutionDecoder> IDecodingEvaluator.PackingSolutionDecoderParameter {
      get { return PackingSolutionDecoderParameter; }
    }
    public IValueLookupParameter<IEvaluator> PackingPlanEvaluatorParameter {
      get { return (IValueLookupParameter<IEvaluator>)Parameters["PackingPlanEvaluator"]; }
    }
    ILookupParameter<IEvaluator> IDecodingEvaluator.PackingPlanEvaluatorParameter {
      get { return PackingPlanEvaluatorParameter; }
    }
    public ILookupParameter<DoubleValue> QualityParameter {
      get { return (ILookupParameter<DoubleValue>)Parameters["Quality"]; }
    }

    [StorableConstructor]
    protected DecodingEvaluator(bool deserializing) : base(deserializing) { }
    protected DecodingEvaluator(DecodingEvaluator<E, D, B, I> original, Cloner cloner)
      : base(original, cloner) {
    }
    public DecodingEvaluator ()
      : base() {
        Parameters.Add(new ValueLookupParameter<IPackingSolutionDecoder>("PackingSolutionDecoder", "The decoding operator that is used to calculate a packing plan from the used representation."));
        Parameters.Add(new ValueLookupParameter<IEvaluator>("PackingPlanEvaluator", "The actual packing plan evaluation operator."));
        Parameters.Add(new LookupParameter<DoubleValue>("Quality", "The quality value aka fitness value of the solution."));
        QualityParameter.Hidden = true;
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new DecodingEvaluator<E, D, B, I>(this, cloner);
    }

    public override IOperation Apply() {
      var decoder = PackingSolutionDecoderParameter.ActualValue;
      var evaluator = PackingPlanEvaluatorParameter.ActualValue;
      if (evaluator == null) throw new InvalidOperationException("A PackingPlanEvaluator could not be found.");

      var operations = new OperationCollection(base.Apply());
      operations.Insert(0, ExecutionContext.CreateChildOperation(evaluator));
      if (decoder != null) // decode before evaluating
        operations.Insert(0, ExecutionContext.CreateChildOperation(decoder));
      return operations;
    }
  }
}