#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.Data;
using HeuristicLab.Operators;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Algorithms.ALPS.SteadyState {
  [Item("SteadyStateMatingPoolCreator", "")]
  [StorableClass]
  public class SteadyStateMatingPoolCreator : SingleSuccessorOperator {
    private ILookupParameter<IScope> WorkingScopeParameter {
      get { return (ILookupParameter<IScope>)Parameters["WorkingScope"]; }
    }
    private ILookupParameter<IScope> LayersScopeParameter {
      get { return (ILookupParameter<IScope>)Parameters["LayersScope"]; }
    }
    private ILookupParameter<IntValue> LayerParameter {
      get { return (ILookupParameter<IntValue>)Parameters["Layer"]; }
    }
    private ILookupParameter<IntArray> AgeLimitsParameter {
      get { return (ILookupParameter<IntArray>)Parameters["AgeLimits"]; }
    }
    private ILookupParameter<IntValue> NumberOfLayersParameter {
      get { return (ILookupParameter<IntValue>)Parameters["NumberOfLayers"]; }
    }
    private ILookupParameter<IntValue> EvaluatedSolutionsParameter {
      get { return (ILookupParameter<IntValue>)Parameters["EvaluatedSolutions"]; }
    }
    private ILookupParameter<IntValue> PopulationSizeParameter {
      get { return (ILookupParameter<IntValue>)Parameters["PopulationSize"]; }
    }

    [StorableConstructor]
    private SteadyStateMatingPoolCreator(bool deserializing)
      : base(deserializing) { }
    private SteadyStateMatingPoolCreator(SteadyStateMatingPoolCreator original, Cloner cloner)
      : base(original, cloner) { }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new SteadyStateMatingPoolCreator(this, cloner);
    }
    public SteadyStateMatingPoolCreator()
      : base() {
      Parameters.Add(new LookupParameter<IScope>("WorkingScope"));
      Parameters.Add(new LookupParameter<IScope>("LayersScope"));
      Parameters.Add(new LookupParameter<IntValue>("Layer"));
      Parameters.Add(new LookupParameter<IntArray>("AgeLimits"));
      Parameters.Add(new LookupParameter<IntValue>("NumberOfLayers"));
      Parameters.Add(new LookupParameter<IntValue>("EvaluatedSolutions"));
      Parameters.Add(new LookupParameter<IntValue>("PopulationSize"));
    }

    public override IOperation Apply() {
      int layerNumber = LayerParameter.ActualValue.Value;
      var workingScope = WorkingScopeParameter.ActualValue;
      var layers = LayersScopeParameter.ActualValue;
      var ageLimits = AgeLimitsParameter.ActualValue;
      int numberOfLayers = NumberOfLayersParameter.ActualValue.Value;
      int evaluations = EvaluatedSolutionsParameter.ActualValue.Value;
      int popSize = PopulationSizeParameter.ActualValue.Value;

      var currentLayer = layers.SubScopes[layerNumber].SubScopes;
      var prevLayer = layerNumber > 0 ? layers.SubScopes[layerNumber - 1].SubScopes : Enumerable.Empty<IScope>();

      var ageLimit = layerNumber < numberOfLayers - 1 ? ageLimits[layerNumber] : int.MaxValue;

      var matingPool =
        from individual in currentLayer.Union(prevLayer)
        let evalsCreated = ((IntValue)individual.Variables["EvalsCreated"].Value).Value
        let age = (evaluations - evalsCreated) / popSize
        where age < ageLimit
        select (IScope)individual/*.Clone()*/;

      foreach (var individual in matingPool) {
        workingScope.SubScopes.Add(individual);
      }
      return base.Apply();
    }
  }
}