// -*- c++ -*-

#ifndef LEMON_NET_GRAPH_H

#define LEMON_NET_GRAPH_H

///\file

///\brief Declaration of EdgePathGraph.

#include <lemon/invalid.h>

#include <lemon/maps.h>

/// The namespace of LEMON

namespace lemon {

  // @defgroup empty_graph The EdgePathGraph class

  // @{

  /// A graph class in that a simple edge can represent a path.

  /// This class provides all the common features of a graph structure

  /// that represents a network. You can handle with it layers. This

  /// means that an edge in one layer can be a complete path in a nother

  /// layer.

  template <typename P, class Gact, class Gsub>

  class EdgePathGraph

  {

  public:

    /// The actual layer

    Gact actuallayer;

    /// The layer on which the edges in this layer can represent paths.

    Gsub * sublayer;

    /// Map of nodes that represent the nodes of this layer in the sublayer

    typename Gact::template NodeMap<typename Gsub::Node *> projection;

    /// Map of routes that are represented by some edges in this layer

    typename Gact::template EdgeMap<P *> edgepath;

    /// Defalult constructor.

    /// We don't need any extra lines, because the actuallayer

    /// variable has run its constructor, when we have created this class

    /// So only the two maps has to be initialised here.

    EdgePathGraph() : projection(actuallayer), edgepath(actuallayer)

    {

    }

    ///Copy consructor.

    EdgePathGraph(const EdgePathGraph<P, Gact, Gsub> & EPG ) : actuallayer(EPG.actuallayer) , edgepath(actuallayer), projection(actuallayer)

    {

    }

    /// Map adder

    /// This function gets two edgemaps. One belongs to the actual layer and the

    /// other belongs to the sublayer.

    /// The function iterates through all of the edges in the edgemap belonging to the actual layer.

    /// It gets the value that belongs to the actual edge, and adds it to the value of each edge in the

    /// path represented by itself in the edgemap that belongs to the sublayer.

    template <typename T1, typename T2> void addMap (typename Gact::EdgeMap<T1> & actmap, typename Gsub::EdgeMap<T2> & submap)

    {

      for(EdgeIt e(actuallayer);actuallayer.valid(e);actuallayer.next(e))

      {

	typedef typename P::EdgeIt PEdgeIt;

	PEdgeIt f;

	//dep//cout << "Edge " << id(tail(e)) << " - " << id(head(e)) << " in actual layer is";

	T1 incr=actmap[e];

	//cout << incr << endl;

        if(edgepath[e])

	{

	  //dep//cout << endl << "Path";

	  for(edgepath[e]->first(f); edgepath[e]->valid(f); edgepath[e]->next(f))

	  {

	    //dep//cout << " " << sublayer->id(sublayer->tail(f)) << "-" << sublayer->id(sublayer->head(f));

	    submap[f]+=incr;

	  }

	  //dep////cout << EPGr2.id(EPGr2.head(f)) << endl;

	  //dep//cout << endl;

	}

	else

	{

	  //dep//cout << " itself." <<endl;

	}

      }  

    };

    /// Describe

    /// This function walks thorugh the edges of the actual layer

    /// and displays the path represented by the actual edge.

    void describe ()

    {

      for(EdgeIt e(actuallayer);actuallayer.valid(e);actuallayer.next(e))

      {

	typedef typename P::EdgeIt PEdgeIt;

	PEdgeIt f;

	cout << "Edge " << id(tail(e)) << " - " << id(head(e)) << " in actual layer is";

        if(edgepath[e])

	{

	  cout << endl << "Path";

	  for(edgepath[e]->first(f); edgepath[e]->valid(f); edgepath[e]->next(f))

	  {

	    cout << " " << sublayer->id(sublayer->tail(f)) << "-" << sublayer->id(sublayer->head(f));

	  }

	  //cout << EPGr2.id(EPGr2.head(f)) << endl;

	  cout << endl;

	}

	else

	{

	  cout << " itself." <<endl;

	}

      }  

    };

    /// The base type of the node iterators.

    /// This is the base type of each node iterators,

    /// thus each kind of node iterator will convert to this.

    /// The Node type of the EdgePathGraph is the Node type of the actual layer.

    typedef typename Gact::Node Node;

    /// This iterator goes through each node.

    /// Its usage is quite simple, for example you can count the number

    /// of nodes in graph \c G of type \c Graph like this:

    /// \code

    ///int count=0;

    ///for(Graph::NodeIt n(G);G.valid(n);G.next(n)) count++;

    /// \endcode

    /// The NodeIt type of the EdgePathGraph is the NodeIt type of the actual layer.

    typedef typename Gact::NodeIt NodeIt;

    /// The base type of the edge iterators.

    /// The Edge type of the EdgePathGraph is the Edge type of the actual layer.

    typedef typename  Gact::Edge Edge;

    /// This iterator goes trough the outgoing edges of a node.

    /// This iterator goes trough the \e outgoing edges of a certain node

    /// of a graph.

    /// Its usage is quite simple, for example you can count the number

    /// of outgoing edges of a node \c n

    /// in graph \c G of type \c Graph as follows.

    /// \code

    ///int count=0;

    ///for(Graph::OutEdgeIt e(G,n);G.valid(e);G.next(e)) count++;

    /// \endcode

    /// The OutEdgeIt type of the EdgePathGraph is the OutEdgeIt type of the actual layer.

    typedef typename Gact::OutEdgeIt OutEdgeIt;

    /// This iterator goes trough the incoming edges of a node.

    /// This iterator goes trough the \e incoming edges of a certain node

    /// of a graph.

    /// Its usage is quite simple, for example you can count the number

    /// of outgoing edges of a node \c n

    /// in graph \c G of type \c Graph as follows.

    /// \code

    ///int count=0;

    ///for(Graph::InEdgeIt e(G,n);G.valid(e);G.next(e)) count++;

    /// \endcode

    /// The InEdgeIt type of the EdgePathGraph is the InEdgeIt type of the actual layer.

    typedef typename Gact::InEdgeIt InEdgeIt;

    /// This iterator goes through each edge.

    /// This iterator goes through each edge of a graph.

    /// Its usage is quite simple, for example you can count the number

    /// of edges in a graph \c G of type \c Graph as follows:

    /// \code

    ///int count=0;

    ///for(Graph::EdgeIt e(G);G.valid(e);G.next(e)) count++;

    /// \endcode

    /// The EdgeIt type of the EdgePathGraph is the EdgeIt type of the actual layer.

    typedef typename Gact::EdgeIt EdgeIt;

    /// First node of the graph.

    /// \retval i the first node.

    /// \return the first node.

    typename Gact::NodeIt &first(typename Gact::NodeIt &i) const { return actuallayer.first(i);}

    /// The first incoming edge.

    typename Gact::InEdgeIt &first(typename Gact::InEdgeIt &i, typename Gact::Node) const { return actuallayer.first(i);}

    /// The first outgoing edge.

    typename Gact::OutEdgeIt &first(typename Gact::OutEdgeIt &i, typename Gact::Node) const { return actuallayer.first(i);}

    //  SymEdgeIt &first(SymEdgeIt &, Node) const { return i;}

    /// The first edge of the Graph.

    typename Gact::EdgeIt &first(typename Gact::EdgeIt &i) const { return actuallayer.first(i);}

//     Node getNext(Node) const {}

//     InEdgeIt getNext(InEdgeIt) const {}

//     OutEdgeIt getNext(OutEdgeIt) const {}

//     //SymEdgeIt getNext(SymEdgeIt) const {}

//     EdgeIt getNext(EdgeIt) const {}

    /// Go to the next node.

    typename Gact::NodeIt &next(typename Gact::NodeIt &i) const { return actuallayer.next(i);}

    /// Go to the next incoming edge.

    typename Gact::InEdgeIt &next(typename Gact::InEdgeIt &i) const { return actuallayer.next(i);}

    /// Go to the next outgoing edge.

    typename Gact::OutEdgeIt &next(typename Gact::OutEdgeIt &i) const { return actuallayer.next(i);}

    //SymEdgeIt &next(SymEdgeIt &) const {}

    /// Go to the next edge.

    typename Gact::EdgeIt &next(typename Gact::EdgeIt &i) const { return actuallayer.next(i);}

    ///Gives back the head node of an edge.

    typename Gact::Node head(typename Gact::Edge edge) const { return actuallayer.head(edge); }

    ///Gives back the tail node of an edge.

    typename Gact::Node tail(typename Gact::Edge edge) const { return actuallayer.tail(edge); }

    //   Node aNode(InEdgeIt) const {}

    //   Node aNode(OutEdgeIt) const {}

    //   Node aNode(SymEdgeIt) const {}

    //   Node bNode(InEdgeIt) const {}

    //   Node bNode(OutEdgeIt) const {}

    //   Node bNode(SymEdgeIt) const {}

    /// Checks if a node iterator is valid

    ///\todo Maybe, it would be better if iterator converted to

    ///bool directly, as Jacint prefers.

    bool valid(const typename Gact::Node& node) const { return actuallayer.valid(node);}

    /// Checks if an edge iterator is valid

    ///\todo Maybe, it would be better if iterator converted to

    ///bool directly, as Jacint prefers.

    bool valid(const typename Gact::Edge& edge) const { return actuallayer.valid(edge);}

    ///Gives back the \e id of a node.

    ///\warning Not all graph structures provide this feature.

    ///

    int id(const typename Gact::Node & node) const { return actuallayer.id(node);}

    ///Gives back the \e id of an edge.

    ///\warning Not all graph structures provide this feature.

    ///

    int id(const typename Gact::Edge & edge) const { return actuallayer.id(edge);}

    //void setInvalid(Node &) const {};

    //void setInvalid(Edge &) const {};

    ///Add a new node to the graph.

    /// \return the new node.

    ///

    typename Gact::Node addNode() { return actuallayer.addNode();}

    ///Add a new edge to the graph.

    ///Add a new edge to the graph with tail node \c tail

    ///and head node \c head.

    ///\return the new edge.

    typename Gact::Edge addEdge(typename Gact::Node node1, typename Gact::Node node2) { return actuallayer.addEdge(node1, node2);}

    /// Resets the graph.

    /// This function deletes all edges and nodes of the graph.

    /// It also frees the memory allocated to store them.

    void clear() {actuallayer.clear();}

    int nodeNum() const { return actuallayer.nodeNum();}

    int edgeNum() const { return actuallayer.edgeNum();}

    ///Read/write/reference map of the nodes to type \c T.

    ///Read/write/reference map of the nodes to type \c T.

    /// \sa MemoryMap

    /// \todo We may need copy constructor

    /// \todo We may need conversion from other nodetype

    /// \todo We may need operator=

    /// \warning Making maps that can handle bool type (NodeMap<bool>)

    /// needs extra attention!

    template<class T> class NodeMap

    {

    public:

      typedef T ValueType;

      typedef Node KeyType;

      NodeMap(const EdgePathGraph &) {}

      NodeMap(const EdgePathGraph &, T) {}

      template<typename TT> NodeMap(const NodeMap<TT> &) {}

      /// Sets the value of a node.

      /// Sets the value associated with node \c i to the value \c t.

      ///

      void set(Node, T) {}

      // Gets the value of a node.

      //T get(Node i) const {return *(T*)0;}  //FIXME: Is it necessary?

      T &operator[](Node) {return *(T*)0;}

      const T &operator[](Node) const {return *(T*)0;}

      /// Updates the map if the graph has been changed

      /// \todo Do we need this?

      ///

      void update() {}

      void update(T a) {}   //FIXME: Is it necessary

    };

    ///Read/write/reference map of the edges to type \c T.

    ///Read/write/reference map of the edges to type \c T.

    ///It behaves exactly in the same way as \ref NodeMap.

    /// \sa NodeMap

    /// \sa MemoryMap

    /// \todo We may need copy constructor

    /// \todo We may need conversion from other edgetype

    /// \todo We may need operator=

    template<class T> class EdgeMap

    {

    public:

      typedef T ValueType;

      typedef Edge KeyType;

      EdgeMap(const EdgePathGraph &) {}

      EdgeMap(const EdgePathGraph &, T ) {}

      ///\todo It can copy between different types.

      ///

      template<typename TT> EdgeMap(const EdgeMap<TT> &) {}

      void set(Edge, T) {}

      //T get(Edge) const {return *(T*)0;}

      T &operator[](Edge) {return *(T*)0;}

      const T &operator[](Edge) const {return *(T*)0;}

      void update() {}

      void update(T a) {}   //FIXME: Is it necessary

    };

  };

  /// An empty erasable graph class.

  /// This class provides all the common features of an \e erasable graph

  /// structure,

  /// however completely without implementations and real data structures

  /// behind the interface.

  /// All graph algorithms should compile with this class, but it will not

  /// run properly, of course.

  ///

  /// \todo This blabla could be replaced by a sepatate description about

  /// s.

  ///

  /// It can be used for checking the interface compatibility,

  /// or it can serve as a skeleton of a new graph structure.

  /// 

  /// Also, you will find here the full documentation of a certain graph

  /// feature, the documentation of a real graph imlementation

  /// like @ref ListGraph or

  /// @ref SmartGraph will just refer to this structure.

  template <typename P, typename Gact, typename Gsub>

  class ErasableEdgePathGraph : public EdgePathGraph<P, Gact, Gsub>

  {

  public:

    /// Deletes a node.

    void erase(typename Gact::Node n) {actuallayer.erase(n);}

    /// Deletes an edge.

    void erase(typename Gact::Edge e) {actuallayer.erase(e);}

    /// Defalult constructor.

    ErasableEdgePathGraph() {}

    ///Copy consructor.

    ErasableEdgePathGraph(const EdgePathGraph<P, Gact, Gsub> &EPG) {}

  };

  // @}

} //namespace lemon

#endif // LEMON_SKELETON_GRAPH_H