#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.Collections.Generic;
using System.Linq;
using HeuristicLab.Core;
using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;

namespace HeuristicLab.EvolutionTracking {
  [Item("Symbol graph", "A graph used to store the relationship between symbols in a population of individuals")]
  [StorableClass]
  public class SymbolGraph : DirectedGraph {
    [Storable]
    private readonly Dictionary<string, SymbolNode> nodeMap = new Dictionary<string, SymbolNode>();

    public void AddVertex(SymbolNode node) {
      if (nodeMap.ContainsKey(node.Label)) return; // node already present? do nothing
      nodeMap[node.Label] = node;
      base.AddVertex(node);
    }

    public bool ContainsKey(string key) {
      return nodeMap.ContainsKey(key);
    }

    public SymbolNode GetNode(string key) {
      SymbolNode node;
      nodeMap.TryGetValue(key, out node);
      return node;
    }

    void AddArc(SymbolNode source, SymbolNode target, double weight, object data = null) {
      source.AddForwardArc(target, weight, data);
    }
  }

  [StorableClass]
  public class SymbolNode : Vertex {
    public ISymbol Symbol { get; set; }
    public Dictionary<int, int> Positions { get; set; }
    public double AverageArity { get; set; }

    public new List<SymbolArc> InArcs {
      get { return base.InArcs == null ? null : base.InArcs.Cast<SymbolArc>().ToList(); }
    }

    public new List<SymbolArc> OutArcs {
      get { return base.OutArcs == null ? null : base.OutArcs.Cast<SymbolArc>().ToList(); }
    }

    public SymbolNode() {
    }
  }

  public class SymbolArc : IArc {
    public IVertex Source { get; set; }
    public IVertex Target { get; set; }
    public double Weight { get; set; }

    public object Data { get; set; }
  }
}