// Copyright (c) 1997  INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
// You can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// Licensees holding a valid commercial license may use this file in
// accordance with the commercial license agreement provided with the software.
//
// This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
// WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
//
// $URL$
// $Id$
// 
//
// Author(s)     : Mariette Yvinec

#ifndef CGAL_TRIANGULATION_FACE_BASE_2_H
#define CGAL_TRIANGULATION_FACE_BASE_2_H

#include <CGAL/basic.h>
#include <CGAL/triangulation_assertions.h>
#include <CGAL/Triangulation_ds_face_base_2.h>

namespace CGAL { 

template < typename Gt, typename Fb = Triangulation_ds_face_base_2<> >
class Triangulation_face_base_2 
  : public Fb
{
public:
  typedef Gt                                           Geom_traits;
  typedef typename Fb::Vertex_handle                   Vertex_handle;
  typedef typename Fb::Face_handle                     Face_handle;

  template < typename TDS2 >
  struct Rebind_TDS {
    typedef typename Fb::template Rebind_TDS<TDS2>::Other  Fb2;
    typedef Triangulation_face_base_2<Gt, Fb2>             Other;
  };

public:
  Triangulation_face_base_2()
       : Fb() {}

  Triangulation_face_base_2(Vertex_handle v0, 
			    Vertex_handle v1, 
			    Vertex_handle v2)
    : Fb(v0,v1,v2) {}

  Triangulation_face_base_2(Vertex_handle v0, 
			    Vertex_handle v1, 
			    Vertex_handle v2,
			    Face_handle n0, 
			    Face_handle n1, 
			    Face_handle n2)
    : Fb(v0,v1,v2,n0,n1,n2) {}

  static int ccw(int i) {return Triangulation_cw_ccw_2::ccw(i);}
  static int  cw(int i) {return Triangulation_cw_ccw_2::cw(i);}

#ifndef CGAL_NO_DEPRECATED_CODE
  Vertex_handle mirror_vertex(int i) const;
  int mirror_index(int i) const;
#endif

};

#ifndef CGAL_NO_DEPRECATED_CODE
template < class Gt, class Fb >
inline
typename Triangulation_face_base_2<Gt,Fb>::Vertex_handle
Triangulation_face_base_2<Gt,Fb>::
mirror_vertex(int i) const
{
  CGAL_triangulation_precondition ( this->neighbor(i) != Face_handle()
				    && this->dimension() >= 1);
  //return neighbor(i)->vertex(neighbor(i)->index(this->handle()));
  return this->neighbor(i)->vertex(mirror_index(i));
}

template < class Gt, class Fb >
inline int
Triangulation_face_base_2<Gt,Fb>::
mirror_index(int i) const
{
  // return the index of opposite vertex in neighbor(i);
  CGAL_triangulation_precondition (this->neighbor(i) != Face_handle() &&
	                           this->dimension() >= 1);
  if (this->dimension() == 1) {
    return 1 - (this->neighbor(i)->index(this->vertex(1-i)));
  }
  return this->ccw( this->neighbor(i)->index(this->vertex(this->ccw(i))));
}
#endif

} //namespace CGAL 

#endif //CGAL_TRIANGULATION_FACE_BASE_2_H
