#region License Information

/* HeuristicLab
 * Copyright (C) 2002-2019 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.Linq;
using HEAL.Attic;
using HeuristicLab.Analysis;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Optimization;

namespace HeuristicLab.Encodings.PermutationEncoding {
  [StorableType("7bc5215b-c181-40d0-a758-d7c19a356e18")]
  public abstract class PermutationMultiObjectiveProblem : MultiObjectiveProblem<PermutationEncoding, Permutation> {
    public int Length {
      get { return Encoding.Length; }
      set { Encoding.Length = value; }
    }

    public PermutationTypes Type {
      get { return Encoding.Type; }
      set { Encoding.Type = value; }
    }

    [StorableConstructor]
    protected PermutationMultiObjectiveProblem(StorableConstructorFlag _) : base(_) { }
    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      RegisterEventHandlers();
    }

    protected PermutationMultiObjectiveProblem(PermutationMultiObjectiveProblem original, Cloner cloner)
      : base(original, cloner) {
      RegisterEventHandlers();
    }

    protected PermutationMultiObjectiveProblem() : this(new PermutationEncoding() { Length = 10, Type = PermutationTypes.Absolute }) { }
    protected PermutationMultiObjectiveProblem(PermutationEncoding encoding) : base(encoding) {
      EncodingParameter.ReadOnly = true;

      Operators.Add(new HammingSimilarityCalculator());
      Operators.Add(new PopulationSimilarityAnalyzer(Operators.OfType<ISolutionSimilarityCalculator>()));

      Parameterize();
      RegisterEventHandlers();
    }

    public override void Analyze(Permutation[] individuals, double[][] qualities, ResultCollection results, IRandom random) {
      base.Analyze(individuals, qualities, results, random);
      // TODO: Calculate Pareto front and add to results
    }

    protected override void OnEncodingChanged() {
      base.OnEncodingChanged();
      Parameterize();
    }

    private void Parameterize() {
      foreach (var similarityCalculator in Operators.OfType<ISolutionSimilarityCalculator>()) {
        similarityCalculator.SolutionVariableName = Encoding.Name;
        similarityCalculator.QualityVariableName = Evaluator.QualitiesParameter.ActualName;
      }
    }

    private void RegisterEventHandlers() {
      Encoding.LengthParameter.Value.ValueChanged += LengthParameter_ValueChanged;
      Encoding.PermutationTypeParameter.Value.ValueChanged += TypeParameter_ValueChanged;
    }

    protected virtual void LengthParameter_ValueChanged(object sender, EventArgs e) { }
    protected virtual void TypeParameter_ValueChanged(object sender, EventArgs e) { }
  }
}