// Copyright (c) 1999  Utrecht University (The Netherlands),
// ETH Zurich (Switzerland), Freie Universitaet Berlin (Germany),
// INRIA Sophia-Antipolis (France), Martin-Luther-University Halle-Wittenberg
// (Germany), Max-Planck-Institute Saarbruecken (Germany), RISC Linz (Austria),
// and Tel-Aviv University (Israel).  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 Lesser General Public License as
// published by the Free Software Foundation; version 2.1 of the License.
// See the file LICENSE.LGPL distributed with CGAL.
//
// 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)     : Andreas Fabri
//                 Stefan Schirra

#ifndef CGAL_LINE_3_H
#define CGAL_LINE_3_H

CGAL_BEGIN_NAMESPACE

template <class R_>
class Line_3 : public R_::Kernel_base::Line_3
{
  typedef typename R_::RT                    RT;
  typedef typename R_::Point_3               Point_3;
  typedef typename R_::Ray_3                 Ray_3;
  typedef typename R_::Segment_3             Segment_3;
  typedef typename R_::Direction_3           Direction_3;
  typedef typename R_::Vector_3              Vector_3;
  typedef typename R_::Plane_3               Plane_3;
  typedef typename R_::Aff_transformation_3  Aff_transformation_3;
public:

  typedef typename R_::Kernel_base::Line_3   Rep;

  const Rep& rep() const
  {
    return *this;
  }

  Rep& rep()
  {
    return *this;
  }

  typedef          R_                       R;

  Line_3() {}

  // conversion impl -> interface class
  Line_3(const Rep& l)
      : Rep(l) {}

  Line_3(const Point_3 & p, const Point_3 & q)
      : Rep(typename R::Construct_line_3()(p, q).rep()) {}

  Line_3(const Segment_3 & s)
      : Rep(typename R::Construct_line_3()(s).rep()) {}

  Line_3(const Ray_3 & r)
      : Rep(typename R::Construct_line_3()(r).rep()) {}

  Line_3(const Point_3 & p, const Direction_3 & d)
      : Rep(typename R::Construct_line_3()(p, d).rep()) {}

  Line_3(const Point_3 & p, const Vector_3 & v)
      : Rep(typename R::Construct_line_3()(p, v).rep()) {}

  Line_3 transform(const Aff_transformation_3 &t) const
  {
    return Line_3(t.transform(this->point()), t.transform(this->direction()));
  }

  Vector_3 to_vector() const
  {
    return R().construct_vector_3_object()(*this);
  }

  Direction_3 direction() const
  {
    return R().construct_direction_3_object()(*this);
  }

  bool has_on(const Point_3 &p) const 
  { 
    return R().has_on_3_object()(*this, p);
    //return has_on_boundary(p); 
  }

  Point_3 point() const
  { 
    return R().construct_point_on_3_object()(*this, 0);
  }

  Point_3 point(int i) const
  { 
    return R().construct_point_on_3_object()(*this, i);
  }

  Line_3 opposite() const
  {
    return R().construct_opposite_line_3_object()(*this);
  }

  Plane_3 perpendicular_plane(const Point_3 &p) const
  {
    return R().construct_perpendicular_plane_3_object()(*this, p);
  }

  Point_3 projection(const Point_3 &p) const
  {
    return R().construct_projected_point_3_object()(*this, p);
  }

  bool is_degenerate() const
  {
    return R().is_degenerate_3_object()(*this);
  }
  
};

#ifndef CGAL_NO_OSTREAM_INSERT_LINE_3
template < class R >
std::ostream&
operator<<(std::ostream& os, const Line_3<R>& l)
{
  typedef typename  R::Kernel_base::Line_3  Rep;
  return os << static_cast<const Rep&>(l);
}
#endif // CGAL_NO_OSTREAM_INSERT_LINE_3

#ifndef CGAL_NO_ISTREAM_EXTRACT_LINE_3
template < class R >
std::istream&
operator>>(std::istream & is, Line_3<R> & p)
{
  typedef typename  R::Kernel_base::Line_3  Rep;
  is >> static_cast<Rep&>(p);
  return is;
}
#endif // CGAL_NO_ISTREAM_EXTRACT_LINE_3

CGAL_END_NAMESPACE

#endif // CGAL_LINE_3_H