#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;
using System.Collections.Generic;
using System.Linq;
using HeuristicLab.Analysis;
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 {
  [Item("LayerCreator", "An operator which creates a new layer by cloning the oldest one and setting the variables accordingly.")]
  [StorableClass]
  public sealed class LayerCreator : SingleSuccessorOperator {

    /*private static readonly ISet<string> SavedVariables = new HashSet<string>{
      "LocalRandom", "Layer", "LayerEvaluatedSolutions", "NumSubScopes"
    };*/

    private ILookupParameter<IntValue> OpenLayersParameter {
      get { return (ILookupParameter<IntValue>)Parameters["OpenLayers"]; }
    }

    [StorableConstructor]
    private LayerCreator(bool deserializing) : base(deserializing) { }

    private LayerCreator(LayerCreator original, Cloner cloner)
      : base(original, cloner) {
    }
    public LayerCreator()
      : base() {
      Parameters.Add(new LookupParameter<IntValue>("OpenLayers"));
    }

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

    public override IOperation Apply() {
      var scopes = ExecutionContext.Scope.SubScopes;
      if (scopes.Count < 1)
        throw new ArgumentException("At least one sub-scope must exist.");

      var lastSubScope = scopes.Last();
      var clone = (IScope)lastSubScope.Clone(new Cloner());

      int number;
      if (int.TryParse(clone.Name, out number))
        clone.Name = (number + 1).ToString();

      scopes.Add(clone);

      clone.Variables["Layer"].Value = new IntValue(OpenLayersParameter.ActualValue.Value);
      foreach (var solution in clone.SubScopes)
        ((IntValue)solution.Variables["Age"].Value).Value -= 1; // Decrement age, because MainOperator is goint to increment it
      //foreach (var variable in clone.Variables.Where(v => !SavedVariables.Contains(v.Name)))
      //  variable.Value = null;

      //HACK: delete old values from quality table
      /*var rows = ((DataTable)clone.Variables["Qualities"].Value).Rows;
      var last = rows.Last();
      rows.Clear();
      rows.Add(last);*/

      return base.Apply();
    }

  }
}