/* -*- mode: C++; indent-tabs-mode: nil; -*-

 *

 * 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_GRAPH_ADAPTOR_EXTENDER_H

#define LEMON_BITS_GRAPH_ADAPTOR_EXTENDER_H

#include <lemon/core.h>

#include <lemon/error.h>

#include <lemon/bits/default_map.h>

namespace lemon {

  template <typename _Digraph>

  class DigraphAdaptorExtender : public _Digraph {

  public:

    typedef _Digraph Parent;

    typedef _Digraph Digraph;

    typedef DigraphAdaptorExtender Adaptor;

    // 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;

    }

    class NodeIt : public Node {

      const Adaptor* _adaptor;

    public:

      NodeIt() {}

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

      explicit NodeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Node&>(*this));

      }

      NodeIt(const Adaptor& adaptor, const Node& node)

        : Node(node), _adaptor(&adaptor) {}

      NodeIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class ArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      ArcIt() { }

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

      explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Arc&>(*this));

      }

      ArcIt(const Adaptor& adaptor, const Arc& e) :

        Arc(e), _adaptor(&adaptor) { }

      ArcIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class OutArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      OutArcIt() { }

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

      OutArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstOut(*this, node);

      }

      OutArcIt(const Adaptor& adaptor, const Arc& arc)

        : Arc(arc), _adaptor(&adaptor) {}

      OutArcIt& operator++() {

        _adaptor->nextOut(*this);

        return *this;

      }

    };

    class InArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      InArcIt() { }

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

      InArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstIn(*this, node);

      }

      InArcIt(const Adaptor& adaptor, const Arc& arc) :

        Arc(arc), _adaptor(&adaptor) {}

      InArcIt& operator++() {

        _adaptor->nextIn(*this);

        return *this;

      }

    };

    Node baseNode(const OutArcIt &e) const {

      return Parent::source(e);

    }

    Node runningNode(const OutArcIt &e) const {

      return Parent::target(e);

    }

    Node baseNode(const InArcIt &e) const {

      return Parent::target(e);

    }

    Node runningNode(const InArcIt &e) const {

      return Parent::source(e);

    }

  };

  /// \ingroup digraphbits

  ///

  /// \brief Extender for the GraphAdaptors

  template <typename _Graph>

  class GraphAdaptorExtender : public _Graph {

  public:

    typedef _Graph Parent;

    typedef _Graph Graph;

    typedef GraphAdaptorExtender Adaptor;

    typedef typename Parent::Node Node;

    typedef typename Parent::Arc Arc;

    typedef typename Parent::Edge Edge;

    // Graph extension

    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 &a) const {

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

    }

    using Parent::direct;

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

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

    }

    class NodeIt : public Node {

      const Adaptor* _adaptor;

    public:

      NodeIt() {}

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

      explicit NodeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Node&>(*this));

      }

      NodeIt(const Adaptor& adaptor, const Node& node)

        : Node(node), _adaptor(&adaptor) {}

      NodeIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class ArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      ArcIt() { }

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

      explicit ArcIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Arc&>(*this));

      }

      ArcIt(const Adaptor& adaptor, const Arc& e) :

        Arc(e), _adaptor(&adaptor) { }

      ArcIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class OutArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      OutArcIt() { }

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

      OutArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstOut(*this, node);

      }

      OutArcIt(const Adaptor& adaptor, const Arc& arc)

        : Arc(arc), _adaptor(&adaptor) {}

      OutArcIt& operator++() {

        _adaptor->nextOut(*this);

        return *this;

      }

    };

    class InArcIt : public Arc {

      const Adaptor* _adaptor;

    public:

      InArcIt() { }

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

      InArcIt(const Adaptor& adaptor, const Node& node)

        : _adaptor(&adaptor) {

        _adaptor->firstIn(*this, node);

      }

      InArcIt(const Adaptor& adaptor, const Arc& arc) :

        Arc(arc), _adaptor(&adaptor) {}

      InArcIt& operator++() {

        _adaptor->nextIn(*this);

        return *this;

      }

    };

    class EdgeIt : public Parent::Edge {

      const Adaptor* _adaptor;

    public:

      EdgeIt() { }

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

      explicit EdgeIt(const Adaptor& adaptor) : _adaptor(&adaptor) {

        _adaptor->first(static_cast<Edge&>(*this));

      }

      EdgeIt(const Adaptor& adaptor, const Edge& e) :

        Edge(e), _adaptor(&adaptor) { }

      EdgeIt& operator++() {

        _adaptor->next(*this);

        return *this;

      }

    };

    class IncEdgeIt : public Edge {

      friend class GraphAdaptorExtender;

      const Adaptor* _adaptor;

      bool direction;

    public:

      IncEdgeIt() { }

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

      IncEdgeIt(const Adaptor& adaptor, const Node &n) : _adaptor(&adaptor) {

        _adaptor->firstInc(static_cast<Edge&>(*this), direction, n);

      }

      IncEdgeIt(const Adaptor& adaptor, const Edge &e, const Node &n)

        : _adaptor(&adaptor), Edge(e) {

        direction = (_adaptor->u(e) == n);

      }

      IncEdgeIt& operator++() {

        _adaptor->nextInc(*this, direction);

        return *this;

      }

    };

    Node baseNode(const OutArcIt &a) const {

      return Parent::source(a);

    }

    Node runningNode(const OutArcIt &a) const {

      return Parent::target(a);

    }

    Node baseNode(const InArcIt &a) const {

      return Parent::target(a);

    }

    Node runningNode(const InArcIt &a) const {

      return Parent::source(a);

    }

    Node baseNode(const IncEdgeIt &e) const {

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

    }

    Node runningNode(const IncEdgeIt &e) const {

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

    }

  };

}

#endif