#region License Information
/* HeuristicLab
 * Copyright (C) 2002-2012 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.Linq;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Data;
using HeuristicLab.Operators;
using HeuristicLab.Optimization;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Encodings.ParameterConfigurationEncoding {
  /// <summary>
  /// TODO
  /// </summary>
  [Item("ParameterConfigurationManipulator", "TODO")]
  [StorableClass]
  public abstract class ParameterConfigurationManipulator : SingleSuccessorOperator, IParameterConfigurationManipulator, IStochasticOperator {
    public override bool CanChangeName {
      get { return false; }
    }
    public ILookupParameter<IRandom> RandomParameter {
      get { return (ILookupParameter<IRandom>)Parameters["Random"]; }
    }
    public IValueLookupParameter<ParameterConfigurationTree> ParameterConfigurationTreeParameter {
      get { return (IValueLookupParameter<ParameterConfigurationTree>)Parameters["ParameterConfigurationTree"]; }
    }

    public IValueLookupParameter<IIntValueManipulator> IntValueManipulatorParameter {
      get { return (IValueLookupParameter<IIntValueManipulator>)Parameters["IntValueManipulator"]; }
    }
    public IValueLookupParameter<IDoubleValueManipulator> DoubleValueManipulatorParameter {
      get { return (IValueLookupParameter<IDoubleValueManipulator>)Parameters["DoubleValueManipulator"]; }
    }

    #region Constructors and Cloning
    public ParameterConfigurationManipulator()
      : base() {
      Parameters.Add(new ValueLookupParameter<IRandom>("Random", "The pseudo random number generator which should be used for stochastic manipulation operators."));
      Parameters.Add(new ValueLookupParameter<ParameterConfigurationTree>("ParameterConfigurationTree", "The parameter configuration which should be manipulated."));
      Parameters.Add(new ValueLookupParameter<IIntValueManipulator>("IntValueManipulator", ""));
      Parameters.Add(new ValueLookupParameter<IDoubleValueManipulator>("DoubleValueManipulator", ""));
    }

    [StorableConstructor]
    protected ParameterConfigurationManipulator(bool deserializing) : base(deserializing) { }
    protected ParameterConfigurationManipulator(ParameterConfigurationManipulator original, Cloner cloner) : base(original, cloner) { }
    #endregion

    public override IOperation Apply() {
      Apply(RandomParameter.ActualValue, ParameterConfigurationTreeParameter.ActualValue, IntValueManipulatorParameter.ActualValue, DoubleValueManipulatorParameter.ActualValue);
      return base.Apply();
    }

    public static void Apply(IRandom random, IValueConfiguration configuration, IIntValueManipulator intValueManipulator, IDoubleValueManipulator doubleValueManipulator) {
      Mutate(random, configuration, intValueManipulator, doubleValueManipulator);
    }

    public static void Mutate(IRandom random, IOptimizable configuration, IIntValueManipulator intValueManipulator, IDoubleValueManipulator doubleValueManipulator) {
      if (configuration is ParameterizedValueConfiguration) {
        var configVc = (ParameterizedValueConfiguration)configuration;
        for (int i = 0; i < configVc.ParameterConfigurations.Count; i++)
          Mutate(random, configVc.ParameterConfigurations.ElementAt(i), intValueManipulator, doubleValueManipulator);
      } else if (configuration is ParameterConfiguration) {
        var configPc = (IParameterConfiguration)configuration;
        if (configPc.Optimize) {
          foreach (var vc in configPc.ValueConfigurations)
            if (configPc.ValueConfigurations.ItemChecked(vc))
              if (vc.Optimize) Mutate(random, vc, intValueManipulator, doubleValueManipulator);
          do configPc.ActualValueConfigurationIndex = random.Next(configPc.ValueConfigurations.Count);
          while (!configPc.ValueConfigurations.ItemChecked(configPc.ValueConfigurations[configPc.ActualValueConfigurationIndex]));
          configPc.ActualValue = configPc.ValueConfigurations[configPc.ActualValueConfigurationIndex].ActualValue;
        }
      } else if (configuration is RangeValueConfiguration) {
        var configVc = (RangeValueConfiguration)configuration;
        var value = configVc.ActualValue.Value;
        var range = configVc.RangeConstraint;
        if (value is IntValue)
          intValueManipulator.Apply(random, (IntValue)value, (IntValueRange)range);
        else if (value is PercentValue)
          doubleValueManipulator.Apply(random, (PercentValue)value, ((PercentValueRange)range).AsDoubleValueRange());
        else if (value is DoubleValue)
          doubleValueManipulator.Apply(random, (DoubleValue)value, (DoubleValueRange)range);
      }
    }
  }
}