#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 HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Parameters;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
using CloneMapType = HeuristicLab.Core.ItemDictionary<HeuristicLab.Core.IItem, HeuristicLab.Core.IItem>;
using GeneticExchangeMapType = HeuristicLab.Core.ItemList<HeuristicLab.Core.IItem>;
using TraceMapType = HeuristicLab.Core.ItemDictionary<HeuristicLab.Core.IItem, HeuristicLab.Core.IItemList<HeuristicLab.Core.IItem>>;

namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
  /// <summary>
  /// A base class for operators for symbolic expression trees.
  /// </summary>
  [Item("SymbolicExpressionTreeOperator", "A base class for operators for symbolic expression trees.")]
  [StorableClass]
  public abstract class TracingSymbolicExpressionTreeOperator : SymbolicExpressionTreeOperator, ITracingSymbolicExpressionTreeOperator {
    private const string GlobalTraceMapParameterName = "GlobalTraceMap";
    private const string GlobalCloneMapParameterName = "GlobalCloneMap";
    private const string GlobalFragmentMapParameterName = "GlobalFragmentMap";
    private const string GlobalGeneticExchangeMapParameterName = "GlobalGeneticExchangeMap";

    private const string SymbolicExpressionTreeNodeComparerParameterName = "SymbolicExpressionTreeNodeComparer";
    private const string SymbolicExpressionTreeNodeComparerParameterDescription = "The comparison operator used to check if two symbolic expression tree nodes are equal or similar.";

    #region Parameter properties
    public LookupParameter<CloneMapType> GlobalCloneMapParameter {
      get { return (LookupParameter<CloneMapType>)Parameters[GlobalCloneMapParameterName]; }
    }
    public LookupParameter<TraceMapType> GlobalTraceMapParameter {
      get { return (LookupParameter<TraceMapType>)Parameters[GlobalTraceMapParameterName]; }
    }
    public LookupParameter<CloneMapType> GlobalFragmentMapParameter {
      get { return (LookupParameter<CloneMapType>)Parameters[GlobalFragmentMapParameterName]; }
    }
    public LookupParameter<GeneticExchangeMapType> GlobalGeneticExchangeMapParameter {
      get { return (LookupParameter<GeneticExchangeMapType>)Parameters[GlobalGeneticExchangeMapParameterName]; }
    }
    public ValueParameter<ISymbolicExpressionTreeNodeSimilarityComparer> SymbolicExpressionTreeNodeComparerParameter {
      get { return (ValueParameter<ISymbolicExpressionTreeNodeSimilarityComparer>)Parameters[SymbolicExpressionTreeNodeComparerParameterName]; }
    }
    #endregion

    [StorableHook(HookType.AfterDeserialization)]
    private void AfterDeserialization() {
      if (Parameters.ContainsKey("GlobalTransactionMap"))
        Parameters.Remove("GlobalTransactionMap");
      if (!Parameters.ContainsKey(GlobalGeneticExchangeMapParameterName))
        Parameters.Add(new LookupParameter<GeneticExchangeMapType>(GlobalGeneticExchangeMapParameterName, "A global list of genetic exchange transactions."));
      if (!Parameters.ContainsKey(SymbolicExpressionTreeNodeComparerParameterName))
        Parameters.Add(new ValueParameter<ISymbolicExpressionTreeNodeSimilarityComparer>(SymbolicExpressionTreeNodeComparerParameterName, SymbolicExpressionTreeNodeComparerParameterDescription));
    }

    #region Properties
    public CloneMapType GlobalCloneMap {
      get { return GlobalCloneMapParameter.ActualValue; }
    }
    public TraceMapType GlobalTraceMap {
      get { return GlobalTraceMapParameter.ActualValue; }
    }
    public CloneMapType GlobalFragmentMap {
      get { return GlobalFragmentMapParameter.ActualValue; }
    }
    public GeneticExchangeMapType GlobalGeneticExchangeMap {
      get { return GlobalGeneticExchangeMapParameter.ActualValue; }
    }
    public ISymbolicExpressionTreeNodeSimilarityComparer SymbolicExpressionTreeNodeComparer {
      get { return (ISymbolicExpressionTreeNodeSimilarityComparer)SymbolicExpressionTreeNodeComparerParameter.ActualValue; }
    }
    #endregion

    [StorableConstructor]
    protected TracingSymbolicExpressionTreeOperator(bool deserializing) : base(deserializing) { }
    protected TracingSymbolicExpressionTreeOperator(TracingSymbolicExpressionTreeOperator original, Cloner cloner) : base(original, cloner) { }
    protected TracingSymbolicExpressionTreeOperator()
      : base() {
      Parameters.Add(new LookupParameter<CloneMapType>(GlobalCloneMapParameterName, "A global map keeping track of trees and their clones (made during selection)."));
      Parameters.Add(new LookupParameter<CloneMapType>(GlobalFragmentMapParameterName, "A global map keeping track of tree fragments received via crossover."));
      Parameters.Add(new LookupParameter<TraceMapType>(GlobalTraceMapParameterName, "A global cache containing tracing info."));
      Parameters.Add(new LookupParameter<GeneticExchangeMapType>(GlobalGeneticExchangeMapParameterName, "A global list of genetic exchange transactions."));
      Parameters.Add(new ValueParameter<ISymbolicExpressionTreeNodeSimilarityComparer>(SymbolicExpressionTreeNodeComparerParameterName, SymbolicExpressionTreeNodeComparerParameterDescription));
    }

    protected void AddTracingVariablesToGlobalScope() {
      // add global trace cache if not already present in global scope
      var gScope = ExecutionContext.Scope;
      while (gScope.Parent != null) gScope = gScope.Parent;
      if (GlobalTraceMap == null) gScope.Variables.Add(new Variable(GlobalTraceMapParameterName, new TraceMapType()));
      if (GlobalFragmentMap == null) gScope.Variables.Add(new Variable(GlobalFragmentMapParameterName, new CloneMapType()));
      if (GlobalGeneticExchangeMap == null) gScope.Variables.Add(new Variable(GlobalGeneticExchangeMapParameterName, new GeneticExchangeMapType()));
    }
  }
}