using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices.WindowsRuntime;
using System.Text;
using System.Threading.Tasks;
using HeuristicLab.Common;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.Algorithms.IteratedSymbolicExpressionConstruction {
  // the state represents the combination of parent symbol and it's child index
  [StorableClass]
  [Item("ParentChildStateFunction", "")]
  public class ParentChildStateFunction : Item, IStateFunction {
    public ParentChildStateFunction()
      : base() {
    }

    public object CreateState(ISymbolicExpressionTreeNode root, List<ISymbol> actions, ISymbolicExpressionTreeNode parentNode, int childIdx) {
      if (parentNode == null) return string.Empty;
      else return parentNode.Symbol.Name + "." + string.Join(".", parentNode.Subtrees.Select(t => t.Symbol.Name));
    }

    #region item
    [StorableConstructor]
    protected ParentChildStateFunction(bool deserializing) : base(deserializing) { }
    protected ParentChildStateFunction(ParentChildStateFunction original, Cloner cloner)
      : base(original, cloner) {
    }
    public override IDeepCloneable Clone(Cloner cloner) {
      return new ParentChildStateFunction(this, cloner);
    }
    #endregion
  }
}