/* -*- C++ -*-

  *

  * This file is a part of LEMON, a generic C++ optimization library

  *

  * Copyright (C) 2003-2008

  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport

  * (Egervary Research Group on Combinatorial Optimization, EGRES).

  *

  * Permission to use, modify and distribute this software is granted

  * provided that this copyright notice appears in all copies. For

  * precise terms see the accompanying LICENSE file.

  *

  * This software is provided "AS IS" with no warranty of any kind,

  * express or implied, and with no claim as to its suitability for any

  * purpose.

  *

  */

 #ifndef LEMON_BITS_EDGE_SET_EXTENDER_H

 #define LEMON_BITS_EDGE_SET_EXTENDER_H

 #include <lemon/error.h>

 #include <lemon/bits/default_map.h>

 ///\ingroup digraphbits

 ///\file

 ///\brief Extenders for the arc set types

 namespace lemon {

   /// \ingroup digraphbits

   ///

   /// \brief Extender for the ArcSets

   template <typename Base>

   class ArcSetExtender : public Base {

   public:

     typedef Base Parent;

     typedef ArcSetExtender Digraph;

     // Base extensions

     typedef typename Parent::Node Node;

     typedef typename Parent::Arc Arc;

     int maxId(Node) const {

       return Parent::maxNodeId();

     }

     int maxId(Arc) const {

       return Parent::maxArcId();

     }

     Node fromId(int id, Node) const {

       return Parent::nodeFromId(id);

     }

     Arc fromId(int id, Arc) const {

       return Parent::arcFromId(id);

     }

     Node oppositeNode(const Node &n, const Arc &e) const {

       if (n == Parent::source(e))

 	return Parent::target(e);

       else if(n==Parent::target(e))

 	return Parent::source(e);

       else

 	return INVALID;

     }

     // Alteration notifier extensions

     /// The arc observer registry.

     typedef AlterationNotifier<ArcSetExtender, Arc> ArcNotifier;

   protected:

     mutable ArcNotifier arc_notifier;

   public:

     using Parent::notifier;

     /// \brief Gives back the arc alteration notifier.

     ///

     /// Gives back the arc alteration notifier.

     ArcNotifier& notifier(Arc) const {

       return arc_notifier;

     }

     // Iterable extensions

     class NodeIt : public Node { 

       const Digraph* digraph;

     public:

       NodeIt() {}

       NodeIt(Invalid i) : Node(i) { }

       explicit NodeIt(const Digraph& _graph) : digraph(&_graph) {

 	_graph.first(static_cast<Node&>(*this));

       }

       NodeIt(const Digraph& _graph, const Node& node) 

 	: Node(node), digraph(&_graph) {}

       NodeIt& operator++() { 

 	digraph->next(*this);

 	return *this; 

       }

     };

     class ArcIt : public Arc { 

       const Digraph* digraph;

     public:

       ArcIt() { }

       ArcIt(Invalid i) : Arc(i) { }

       explicit ArcIt(const Digraph& _graph) : digraph(&_graph) {

 	_graph.first(static_cast<Arc&>(*this));

       }

       ArcIt(const Digraph& _graph, const Arc& e) : 

 	Arc(e), digraph(&_graph) { }

       ArcIt& operator++() { 

 	digraph->next(*this);

 	return *this; 

       }

     };

     class OutArcIt : public Arc { 

       const Digraph* digraph;

     public:

       OutArcIt() { }

       OutArcIt(Invalid i) : Arc(i) { }

       OutArcIt(const Digraph& _graph, const Node& node) 

 	: digraph(&_graph) {

 	_graph.firstOut(*this, node);

       }

       OutArcIt(const Digraph& _graph, const Arc& arc) 

 	: Arc(arc), digraph(&_graph) {}

       OutArcIt& operator++() { 

 	digraph->nextOut(*this);

 	return *this; 

       }

     };

     class InArcIt : public Arc { 

       const Digraph* digraph;

     public:

       InArcIt() { }

       InArcIt(Invalid i) : Arc(i) { }

       InArcIt(const Digraph& _graph, const Node& node) 

 	: digraph(&_graph) {

 	_graph.firstIn(*this, node);

       }

       InArcIt(const Digraph& _graph, const Arc& arc) : 

 	Arc(arc), digraph(&_graph) {}

       InArcIt& operator++() { 

 	digraph->nextIn(*this);

 	return *this; 

       }

     };

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (ie. the source in this case) of the iterator

     Node baseNode(const OutArcIt &e) const {

       return Parent::source(static_cast<const Arc&>(e));

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (ie. the target in this case) of the

     /// iterator

     Node runningNode(const OutArcIt &e) const {

       return Parent::target(static_cast<const Arc&>(e));

     }

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (ie. the target in this case) of the iterator

     Node baseNode(const InArcIt &e) const {

       return Parent::target(static_cast<const Arc&>(e));

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (ie. the source in this case) of the

     /// iterator

     Node runningNode(const InArcIt &e) const {

       return Parent::source(static_cast<const Arc&>(e));

     }

     using Parent::first;

     // Mappable extension

     template <typename _Value>

     class ArcMap 

       : public MapExtender<DefaultMap<Digraph, Arc, _Value> > {

     public:

       typedef ArcSetExtender Digraph;

       typedef MapExtender<DefaultMap<Digraph, Arc, _Value> > Parent;

       explicit ArcMap(const Digraph& _g) 

 	: Parent(_g) {}

       ArcMap(const Digraph& _g, const _Value& _v) 

 	: Parent(_g, _v) {}

       ArcMap& operator=(const ArcMap& cmap) {

 	return operator=<ArcMap>(cmap);

       }

       template <typename CMap>

       ArcMap& operator=(const CMap& cmap) {

         Parent::operator=(cmap);

 	return *this;

       }

     };

     // Alteration extension

     Arc addArc(const Node& from, const Node& to) {

       Arc arc = Parent::addArc(from, to);

       notifier(Arc()).add(arc);

       return arc;

     }

     void clear() {

       notifier(Arc()).clear();

       Parent::clear();

     }

     void erase(const Arc& arc) {

       notifier(Arc()).erase(arc);

       Parent::erase(arc);

     }

     ArcSetExtender() {

       arc_notifier.setContainer(*this);

     }

     ~ArcSetExtender() {

       arc_notifier.clear();

     }

   };

   /// \ingroup digraphbits

   ///

   /// \brief Extender for the EdgeSets

   template <typename Base>

   class EdgeSetExtender : public Base {

   public:

     typedef Base Parent;

     typedef EdgeSetExtender Digraph;

     typedef typename Parent::Node Node;

     typedef typename Parent::Arc Arc;

     typedef typename Parent::Edge Edge;

     int maxId(Node) const {

       return Parent::maxNodeId();

     }

     int maxId(Arc) const {

       return Parent::maxArcId();

     }

     int maxId(Edge) const {

       return Parent::maxEdgeId();

     }

     Node fromId(int id, Node) const {

       return Parent::nodeFromId(id);

     }

     Arc fromId(int id, Arc) const {

       return Parent::arcFromId(id);

     }

     Edge fromId(int id, Edge) const {

       return Parent::edgeFromId(id);

     }

     Node oppositeNode(const Node &n, const Edge &e) const {

       if( n == Parent::u(e))

 	return Parent::v(e);

       else if( n == Parent::v(e))

 	return Parent::u(e);

       else

 	return INVALID;

     }

     Arc oppositeArc(const Arc &e) const {

       return Parent::direct(e, !Parent::direction(e));

     }

     using Parent::direct;

     Arc direct(const Edge &e, const Node &s) const {

       return Parent::direct(e, Parent::u(e) == s);

     }

     typedef AlterationNotifier<EdgeSetExtender, Arc> ArcNotifier;

     typedef AlterationNotifier<EdgeSetExtender, Edge> EdgeNotifier;

   protected:

     mutable ArcNotifier arc_notifier;

     mutable EdgeNotifier edge_notifier;

   public:

     using Parent::notifier;

     ArcNotifier& notifier(Arc) const {

       return arc_notifier;

     }

     EdgeNotifier& notifier(Edge) const {

       return edge_notifier;

     }

     class NodeIt : public Node { 

       const Digraph* digraph;

     public:

       NodeIt() {}

       NodeIt(Invalid i) : Node(i) { }

       explicit NodeIt(const Digraph& _graph) : digraph(&_graph) {

 	_graph.first(static_cast<Node&>(*this));

       }

       NodeIt(const Digraph& _graph, const Node& node) 

 	: Node(node), digraph(&_graph) {}

       NodeIt& operator++() { 

 	digraph->next(*this);

 	return *this; 

       }

     };

     class ArcIt : public Arc { 

       const Digraph* digraph;

     public:

       ArcIt() { }

       ArcIt(Invalid i) : Arc(i) { }

       explicit ArcIt(const Digraph& _graph) : digraph(&_graph) {

 	_graph.first(static_cast<Arc&>(*this));

       }

       ArcIt(const Digraph& _graph, const Arc& e) : 

 	Arc(e), digraph(&_graph) { }

       ArcIt& operator++() { 

 	digraph->next(*this);

 	return *this; 

       }

     };

     class OutArcIt : public Arc { 

       const Digraph* digraph;

     public:

       OutArcIt() { }

       OutArcIt(Invalid i) : Arc(i) { }

       OutArcIt(const Digraph& _graph, const Node& node) 

 	: digraph(&_graph) {

 	_graph.firstOut(*this, node);

       }

       OutArcIt(const Digraph& _graph, const Arc& arc) 

 	: Arc(arc), digraph(&_graph) {}

       OutArcIt& operator++() { 

 	digraph->nextOut(*this);

 	return *this; 

       }

     };

     class InArcIt : public Arc { 

       const Digraph* digraph;

     public:

       InArcIt() { }

       InArcIt(Invalid i) : Arc(i) { }

       InArcIt(const Digraph& _graph, const Node& node) 

 	: digraph(&_graph) {

 	_graph.firstIn(*this, node);

       }

       InArcIt(const Digraph& _graph, const Arc& arc) : 

 	Arc(arc), digraph(&_graph) {}

       InArcIt& operator++() { 

 	digraph->nextIn(*this);

 	return *this; 

       }

     };

     class EdgeIt : public Parent::Edge { 

       const Digraph* digraph;

     public:

       EdgeIt() { }

       EdgeIt(Invalid i) : Edge(i) { }

       explicit EdgeIt(const Digraph& _graph) : digraph(&_graph) {

 	_graph.first(static_cast<Edge&>(*this));

       }

       EdgeIt(const Digraph& _graph, const Edge& e) : 

 	Edge(e), digraph(&_graph) { }

       EdgeIt& operator++() { 

 	digraph->next(*this);

 	return *this; 

       }

     };

     class IncEdgeIt : public Parent::Edge {

       friend class EdgeSetExtender;

       const Digraph* digraph;

       bool direction;

     public:

       IncEdgeIt() { }

       IncEdgeIt(Invalid i) : Edge(i), direction(false) { }

       IncEdgeIt(const Digraph& _graph, const Node &n) : digraph(&_graph) {

 	_graph.firstInc(*this, direction, n);

       }

       IncEdgeIt(const Digraph& _graph, const Edge &ue, const Node &n)

 	: digraph(&_graph), Edge(ue) {

 	direction = (_graph.source(ue) == n);

       }

       IncEdgeIt& operator++() {

 	digraph->nextInc(*this, direction);

 	return *this; 

       }

     };

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (ie. the source in this case) of the iterator

     Node baseNode(const OutArcIt &e) const {

       return Parent::source(static_cast<const Arc&>(e));

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (ie. the target in this case) of the

     /// iterator

     Node runningNode(const OutArcIt &e) const {

       return Parent::target(static_cast<const Arc&>(e));

     }

     /// \brief Base node of the iterator

     ///

     /// Returns the base node (ie. the target in this case) of the iterator

     Node baseNode(const InArcIt &e) const {

       return Parent::target(static_cast<const Arc&>(e));

     }

     /// \brief Running node of the iterator

     ///

     /// Returns the running node (ie. the source in this case) of the

     /// iterator

     Node runningNode(const InArcIt &e) const {

       return Parent::source(static_cast<const Arc&>(e));

     }

     /// Base node of the iterator

     ///

     /// Returns the base node of the iterator

     Node baseNode(const IncEdgeIt &e) const {

       return e.direction ? u(e) : v(e);

     }

     /// Running node of the iterator

     ///

     /// Returns the running node of the iterator

     Node runningNode(const IncEdgeIt &e) const {

       return e.direction ? v(e) : u(e);

     }

     template <typename _Value>

     class ArcMap 

       : public MapExtender<DefaultMap<Digraph, Arc, _Value> > {

     public:

       typedef EdgeSetExtender Digraph;

       typedef MapExtender<DefaultMap<Digraph, Arc, _Value> > Parent;

       ArcMap(const Digraph& _g) 

 	: Parent(_g) {}

       ArcMap(const Digraph& _g, const _Value& _v) 

 	: Parent(_g, _v) {}

       ArcMap& operator=(const ArcMap& cmap) {

 	return operator=<ArcMap>(cmap);

       }

       template <typename CMap>

       ArcMap& operator=(const CMap& cmap) {

         Parent::operator=(cmap);

 	return *this;

       }

     };

     template <typename _Value>

     class EdgeMap 

       : public MapExtender<DefaultMap<Digraph, Edge, _Value> > {

     public:

       typedef EdgeSetExtender Digraph;

       typedef MapExtender<DefaultMap<Digraph, Edge, _Value> > Parent;

       EdgeMap(const Digraph& _g) 

 	: Parent(_g) {}

       EdgeMap(const Digraph& _g, const _Value& _v) 

 	: Parent(_g, _v) {}

       EdgeMap& operator=(const EdgeMap& cmap) {

 	return operator=<EdgeMap>(cmap);

       }

       template <typename CMap>

       EdgeMap& operator=(const CMap& cmap) {

         Parent::operator=(cmap);

 	return *this;

       }

     };

     // Alteration extension

     Edge addEdge(const Node& from, const Node& to) {

       Edge edge = Parent::addEdge(from, to);

       notifier(Edge()).add(edge);

       std::vector<Arc> arcs;

       arcs.push_back(Parent::direct(edge, true));

       arcs.push_back(Parent::direct(edge, false));

       notifier(Arc()).add(arcs);

       return edge;

     }

     void clear() {

       notifier(Arc()).clear();

       notifier(Edge()).clear();

       Parent::clear();

     }

     void erase(const Edge& edge) {

       std::vector<Arc> arcs;

       arcs.push_back(Parent::direct(edge, true));

       arcs.push_back(Parent::direct(edge, false));

       notifier(Arc()).erase(arcs);

       notifier(Edge()).erase(edge);

       Parent::erase(edge);

     }

     EdgeSetExtender() {

       arc_notifier.setContainer(*this);

       edge_notifier.setContainer(*this);

     }

     ~EdgeSetExtender() {

       edge_notifier.clear();

       arc_notifier.clear();

     }

   };

 }

 #endif