#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 HeuristicLab.Core;
using HeuristicLab.Optimization;

namespace HeuristicLab.Problems.Programmable {
  public abstract class CompiledProblemDefinition<TEncoding, TSolution> : IProblemDefinition<TEncoding, TSolution>
    where TEncoding : class, IEncoding<TSolution>
    where TSolution : class, ISolution {
    private TEncoding encoding;
    public TEncoding Encoding {
      get { return encoding; }
      internal set {
        if (value == null) throw new ArgumentNullException("The encoding must not be null.");
        encoding = value;
      }
    }

    public dynamic vars { get; set; }
    public abstract void Initialize();

    protected CompiledProblemDefinition() { }
    protected CompiledProblemDefinition(TEncoding encoding)
      : base() {
      Encoding = encoding;
    }
  }

  public abstract class CompiledSingleObjectiveProblemDefinition<TEncoding, TSolution> : CompiledProblemDefinition<TEncoding, TSolution>, ISingleObjectiveProblemDefinition<TEncoding, TSolution>
    where TEncoding : class, IEncoding<TSolution>
    where TSolution : class, ISolution {

    protected CompiledSingleObjectiveProblemDefinition() : base() { }

    protected CompiledSingleObjectiveProblemDefinition(TEncoding encoding)
      : base(encoding) { }

    #region ISingleObjectiveProblemDefinition<TEncoding,TSolution> Members
    public abstract bool Maximization { get; }
    public abstract double Evaluate(TSolution individual, IRandom random);
    public abstract void Analyze(TSolution[] individuals, double[] qualities, ResultCollection results, IRandom random);
    public abstract IEnumerable<TSolution> GetNeighbors(TSolution individual, IRandom random);

    public bool IsBetter(double quality, double bestQuality) {
      return Maximization ? quality > bestQuality : quality < bestQuality;
    }
    #endregion
  }

  public abstract class CompiledMultiObjectiveProblemDefinition<TEncoding, TSolution> : CompiledProblemDefinition<TEncoding, TSolution>, IMultiObjectiveProblemDefinition<TEncoding, TSolution>
    where TEncoding : class, IEncoding<TSolution>
    where TSolution : class, ISolution {

    protected CompiledMultiObjectiveProblemDefinition() : base() { }

    protected CompiledMultiObjectiveProblemDefinition(TEncoding encoding)
      : base(encoding) { }

    #region ISingleObjectiveProblemDefinition<TEncoding,TSolution> Members
    public abstract bool[] Maximization { get; }
    public abstract double[] Evaluate(TSolution individual, IRandom random);
    public abstract void Analyze(TSolution[] individuals, double[][] qualities, ResultCollection results, IRandom random);
    public abstract IEnumerable<TSolution> GetNeighbors(TSolution individual, IRandom random);
    #endregion
  }
}