#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2017 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.Data;
using HeuristicLab.Encodings.IntegerVectorEncoding;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Problems.GeneralizedQuadraticAssignment {
  [Item("N-Move Generator", "Base class for move operators that generate N-Move moves.")]
  [StorableClass]
  public abstract class GQAPNMoveGenerator : GQAPMoveGenerator, IGQAPNMoveOperator {

    #region Parameter Descriptions
    public static readonly string MoveDescription = "Moves represent changes to the current solution. The n-move changes the assignment of up to or exactly n equipments.";
    #endregion

    public ILookupParameter<NMove> MoveParameter {
      get { return (ILookupParameter<NMove>)Parameters["Move"]; }
    }
    public IValueLookupParameter<IntValue> NParameter {
      get { return (IValueLookupParameter<IntValue>)Parameters["N"]; }
    }

    [StorableConstructor]
    protected GQAPNMoveGenerator(bool deserializing) : base(deserializing) { }
    protected GQAPNMoveGenerator(GQAPNMoveGenerator original, Cloner cloner) : base(original, cloner) { }
    public GQAPNMoveGenerator()
      : base() {
      Parameters.Add(new LookupParameter<NMove>("Move", MoveDescription));
      Parameters.Add(new ValueLookupParameter<IntValue>("N", "The maximum number of equipment(s) that should be moved.", new IntValue(2)));
    }

    public override IOperation Apply() {
      List<Scope> scopes = new List<Scope>();
      int counter = 0;
      string name = MoveParameter.TranslatedName;
      foreach (var move in GenerateMoves(AssignmentParameter.ActualValue, NParameter.ActualValue.Value, ProblemInstanceParameter.ActualValue)) {
        scopes.Add(new Scope(counter.ToString()));
        scopes.Last().Variables.Add(new Variable(name, move));
        counter++;
      }
      ExecutionContext.Scope.SubScopes.AddRange(scopes);
      return base.Apply();
    }

    public abstract IEnumerable<NMove> GenerateMoves(IntegerVector assignment, int n, GQAPInstance problemInstance);
  }
}