// -*- c++ -*-

#ifndef LEMON_EXTENDABLE_GRAPH_EXTENDER_H
#define LEMON_EXTENDABLE_GRAPH_EXTENDER_H

namespace lemon {

  template <typename _Base> 
  class ExtendableGraphExtender : public _Base {
  public:

    typedef ExtendableGraphExtender Graph;
    typedef _Base Parent;

    typedef typename Parent::Node Node;
    typedef typename Parent::Edge Edge;

    Node addNode() {
      Node node = Parent::addNode();
      Parent::getNotifier(Node()).add(node);
      return node;
    }
    
    Edge addEdge(const Node& from, const Node& to) {
      Edge edge = Parent::addEdge(from, to);
      Parent::getNotifier(Edge()).add(edge);
      return edge;
    }

  };

  template <typename _Base> 
  class ExtendableEdgeSetExtender : public _Base {
  public:

    typedef ExtendableEdgeSetExtender Graph;
    typedef _Base Parent;

    typedef typename Parent::Edge Edge;
    typedef typename Parent::Node Node;

    Edge addEdge(const Node& from, const Node& to) {
      Edge edge = Parent::addEdge(from, to);
      Parent::getNotifier(Edge()).add(edge);
      return edge;
    }

  };

  template <typename _Base> 
  class ExtendableUGraphExtender : public _Base {
  public:

    typedef ExtendableUGraphExtender Graph;
    typedef _Base Parent;

    typedef typename Parent::Node Node;
    typedef typename Parent::Edge Edge;
    typedef typename Parent::UEdge UEdge;

    Node addNode() {
      Node node = Parent::addNode();
      Parent::getNotifier(Node()).add(node);
      return node;
    }

    UEdge addEdge(const Node& from, const Node& to) {
      UEdge uedge = Parent::addEdge(from, to);
      Parent::getNotifier(UEdge()).add(uedge);

      std::vector<Edge> edges;
      edges.push_back(Parent::direct(uedge, true));
      edges.push_back(Parent::direct(uedge, false));
      Parent::getNotifier(Edge()).add(edges);

      return uedge;
    }

  };

  template <typename _Base> 
  class ExtendableUEdgeSetExtender : public _Base {
  public:

    typedef ExtendableUEdgeSetExtender Graph;
    typedef _Base Parent;

    typedef typename Parent::Node Node;
    typedef typename Parent::Edge Edge;
    typedef typename Parent::UEdge UEdge;

    UEdge addEdge(const Node& from, const Node& to) {
      UEdge uedge = Parent::addEdge(from, to);
      Parent::getNotifier(UEdge()).add(uedge);

      std::vector<Edge> edges;
      edges.push_back(Parent::direct(uedge, true));
      edges.push_back(Parent::direct(uedge, false));
      Parent::getNotifier(Edge()).add(edges);

      return uedge;
    }

  };


  template <typename _Base>
  class ExtendableBpUGraphExtender : public _Base {
  public:

    typedef _Base Parent;
    typedef ExtendableBpUGraphExtender Graph;
  
    typedef typename Parent::Node Node;
    typedef typename Parent::BNode BNode;
    typedef typename Parent::ANode ANode;
    typedef typename Parent::Edge Edge;
    typedef typename Parent::UEdge UEdge;
  
    Node addANode() {
      Node node = Parent::addANode();
      Parent::getNotifier(ANode()).add(node);
      Parent::getNotifier(Node()).add(node);
      return node;
    }

    Node addBNode() {
      Node node = Parent::addBNode();
      Parent::getNotifier(BNode()).add(node);
      Parent::getNotifier(Node()).add(node);
      return node;
    }
  
    UEdge addEdge(const Node& source, const Node& target) {
      UEdge uedge = Parent::addEdge(source, target);
      Parent::getNotifier(UEdge()).add(uedge);
    
      std::vector<Edge> edges;
      edges.push_back(Parent::direct(uedge, true));
      edges.push_back(Parent::direct(uedge, false));
      Parent::getNotifier(Edge()).add(edges);
    
      return uedge;
    }

  };

}

#endif