// -*- c++ -*-

#ifndef HUGO_NET_GRAPH_H

#define HUGO_NET_GRAPH_H

///\file

///\brief Declaration of HierarchyGraph.

#include <hugo/invalid.h>

#include <hugo/maps.h>

/// The namespace of HugoLib

namespace hugo

{

  // @defgroup empty_graph The HierarchyGraph class

  // @{

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

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

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

  /// means that a node in one layer can be a complete network in a nother

  /// layer.

  template < class Gact, class Gsub > class HierarchyGraph

  {

  public:

    /// The actual layer

    Gact actuallayer;

    /// Map of the subnetworks in the sublayer

    /// The appropriate edge nodes are also stored here

    class SubNetwork

    {

      struct actedgesubnodestruct

      {

	typename Gact::Edge actedge;

	typename Gsub::Node subnode;

      };

      int edgenumber;

      bool connectable;

      Gact *actuallayer;

      typename Gact::Node * actuallayernode;

      Gsub *subnetwork;

      actedgesubnodestruct *assignments;

    public:

      int addAssignment (typename Gact::Edge actedge,

			 typename Gsub::Node subnode)

      {

	if (!(actuallayer->valid (actedge)))

	  {

	    cerr << "The given edge is not in the given network!" << endl;

	    return -1;

	  }

	else if ((actuallayer->id (actuallayer->tail (actedge)) !=

		  actuallayer->id (*actuallayernode))

		 && (actuallayer->id (actuallayer->head (actedge)) !=

		     actuallayer->id (*actuallayernode)))

	  {

	    cerr << "The given edge does not connect to the given node!" <<

	      endl;

	    return -1;

	  }

	if (!(subnetwork->valid (subnode)))

	  {

	    cerr << "The given node is not in the given network!" << endl;

	    return -1;

	  }

	int i = 0;

	//while in the array there is valid note that is not equvivalent with the one that would be noted increase i

	while ((i < edgenumber)

	       && (actuallayer->valid (assignments[i].actedge))

	       && (assignments[i].actedge != actedge))

	  i++;

	if (assignments[i].actedge == actedge)

	  {

	    cout << "Warning: Redefinement of assigment!!!" << endl;

	  }

	if (i == edgenumber)

	  {

	    cout <<

	      "This case can't be!!! (because there should be the guven edge in the array already and the cycle had to stop)"

	      << endl;

	  }

	//if(!(actuallayer->valid(assignments[i].actedge)))   //this condition is necessary if we do not obey redefinition

	{

	  assignments[i].actedge = actedge;

	  assignments[i].subnode = subnode;

	}

	/// If to all of the edges a subnode is assigned then the subnetwork is connectable (attachable?)

	/// We do not need to check for further attributes, because to notice an assignment we need

	/// all of them to be correctly initialised before.

	if (i == edgenumber - 1)

	  connectable = 1;

	return 0;

      }

      int setSubNetwork (Gsub * sn)

      {

	subnetwork = sn;

	return 0;

      }

      int setActualLayer (Gact * al)

      {

	actuallayer = al;

	return 0;

      }

      int setActualLayerNode (typename Gact::Node * aln)

      {

	typename Gact::InEdgeIt iei;

	typename Gact::OutEdgeIt oei;

	actuallayernode = aln;

	edgenumber = 0;

	if (actuallayer)

	  {

	    for (iei = actuallayer->first (iei, (*actuallayernode));

		 ((actuallayer->valid (iei))

		  && (actuallayer->head (iei) == (*actuallayernode)));

		 actuallayer->next (iei))

	      {

		cout << actuallayer->id (actuallayer->

					 tail (iei)) << " " << actuallayer->

		  id (actuallayer->head (iei)) << endl;

		edgenumber++;

	      }

	    //cout << "Number of in-edges: " << edgenumber << endl;

	    for (oei = actuallayer->first (oei, (*actuallayernode));

		 ((actuallayer->valid (oei))

		  && (actuallayer->tail (oei) == (*actuallayernode)));

		 actuallayer->next (oei))

	      {

		cout << actuallayer->id (actuallayer->

					 tail (oei)) << " " << actuallayer->

		  id (actuallayer->head (oei)) << endl;

		edgenumber++;

	      }

	    //cout << "Number of in+out-edges: " << edgenumber << endl;

	    assignments = new actedgesubnodestruct[edgenumber];

	    for (int i = 0; i < edgenumber; i++)

	      {

		assignments[i].actedge = INVALID;

		assignments[i].subnode = INVALID;

	      }

	  }

	else

	  {

	    cerr << "There is no actual layer defined yet!" << endl;

	    return -1;

	  }

	return 0;

      }

    SubNetwork ():edgenumber (0), connectable (false), actuallayer (NULL),

	actuallayernode (NULL), subnetwork (NULL),

	assignments (NULL)

      {

      }

    };

    typename Gact::template NodeMap < SubNetwork > subnetworks;

    /// 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.

  HierarchyGraph ():subnetworks (actuallayer)

    {

    }

    ///Copy consructor.

  HierarchyGraph (const HierarchyGraph < Gact, Gsub > &HG):actuallayer (HG.actuallayer),

      subnetworks

      (actuallayer)

    {

    }

    /// 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 HierarchyGraph 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 HierarchyGraph 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 HierarchyGraph 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 HierarchyGraph 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 HierarchyGraph 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 HierarchyGraph 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 MemoryMapSkeleton

    /// \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 HierarchyGraph &)

      {

      }

      NodeMap (const HierarchyGraph &, 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 MemoryMapSkeleton

    /// \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 HierarchyGraph &)

      {

      }

      EdgeMap (const HierarchyGraph &, 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 eraseable graph class.

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

  /// Skeletons.

  ///

  /// 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 Gact, typename Gsub > class EraseableHierarchyGraph:public HierarchyGraph < 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.

    EraseableHierarchyGraph ()

    {

    }

    ///Copy consructor.

    EraseableHierarchyGraph (const HierarchyGraph < Gact, Gsub > &EPG)

    {

    }

  };

  // @}

}				//namespace hugo

#endif // HUGO_SKELETON_GRAPH_H