#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.Collections.Generic;
using System.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Algorithms.ALPS {
  [Item("ShiftToRightMigrator", "Migrates the selected sub scopes by shifting them to the next(right) subscope.")]
  [StorableClass]
  public sealed class ShiftToRightMigrator : SingleSuccessorOperator, IMigrator {

    [StorableConstructor]
    private ShiftToRightMigrator(bool deserializing)
      : base(deserializing) { }
    private ShiftToRightMigrator(ShiftToRightMigrator original, Cloner cloner)
      : base(original, cloner) { }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new ShiftToRightMigrator(this, cloner);
    }
    public ShiftToRightMigrator()
      : base() {
    }

    public override IOperation Apply() {
      var scope = ExecutionContext.Scope;
      var emigrantsList = new List<IScope>();

      for (int i = 0; i < scope.SubScopes.Count; i++) {
        var emigrants = scope.SubScopes[i].SubScopes[1];
        scope.SubScopes[i].SubScopes.Remove(emigrants);
        emigrantsList.Add(emigrants);
      }

      // Shift last emigrant to begin of list
      emigrantsList.Insert(0, emigrantsList.Last());
      emigrantsList.RemoveAt(emigrantsList.Count - 1);

      for (int i = 0; i < scope.SubScopes.Count; i++)
        scope.SubScopes[i].SubScopes.Add(emigrantsList[i]);

      return base.Apply();
    }
  }
}