// -*- 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