#region License Information
/* HeuristicLab
 * Copyright (C) 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 HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HEAL.Attic;
using HeuristicLab.Random;

namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
  [StorableType("E79432BB-414D-4535-8751-D0139AF048E1")]
  public class WindowedSymbolTreeNode : SymbolicExpressionTreeNode, IWindowedSymbolTreeNode {
    public new WindowedSymbol Symbol {
      get { return (WindowedSymbol)base.Symbol; }
    }
    [Storable]
    private double offset;
    public double Offset {
      get { return offset; }
      set { offset = Math.Min(Math.Max(value, 0.0), 1.0); }
    }
    [Storable]
    private double length;
    public double Length {
      get { return length; }
      set { length = Math.Min(Math.Max(value, 0.0), 1.0); }
    }

    [StorableConstructor]
    protected WindowedSymbolTreeNode(StorableConstructorFlag _) : base(_) { }
    protected WindowedSymbolTreeNode(WindowedSymbolTreeNode original, Cloner cloner)
      : base(original, cloner) {
      offset = original.offset;
      length = original.length;
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new WindowedSymbolTreeNode(this, cloner);
    }

    public WindowedSymbolTreeNode(WindowedSymbol windowedSymbol) : base(windowedSymbol) {
      if (!windowedSymbol.EnableWindowing) {
        Offset = 0.0;
        Length = 1.0;
      }
    }

    public override bool HasLocalParameters {
      get { return Symbol.EnableWindowing; }
    }

    public override void ResetLocalParameters(IRandom random) {
      base.ResetLocalParameters(random);

      if (Symbol.EnableWindowing) {
        Offset = NormalDistributedRandom.NextDouble(random, Symbol.OffsetMu, Symbol.OffsetSigma);
        Length = NormalDistributedRandom.NextDouble(random, Symbol.LengthMu, Symbol.LengthSigma);
      }
    }

    public override void ShakeLocalParameters(IRandom random, double shakingFactor) {
      base.ShakeLocalParameters(random, shakingFactor);

      if (Symbol.EnableWindowing) { 
        Offset += NormalDistributedRandom.NextDouble(random, Symbol.ManipulatorOffsetMu, Symbol.ManipulatorOffsetSigma) * shakingFactor;
        Length += NormalDistributedRandom.NextDouble(random, Symbol.ManipulatorLengthMu, Symbol.ManipulatorLengthSigma) * shakingFactor;
      }
    }

    public override string ToString() {
      return Symbol.EnableWindowing 
        ? base.ToString() + $"[{Offset:f3} : {Length:f3}]" 
        : base.ToString();
    }
  }
}