// Copyright (c) 1999
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Homogeneous_kernel/include/CGAL/Homogeneous/PointH3.h $
// $Id: include/CGAL/Homogeneous/PointH3.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Stefan Schirra

#ifndef CGAL_HOMOGENEOUS_POINT_3_H
#define CGAL_HOMOGENEOUS_POINT_3_H

#include <CGAL/Origin.h>
#include <boost/mpl/and.hpp>
#include <boost/mpl/logical.hpp>

#include <type_traits>

namespace CGAL {

template < class R_ >
class PointH3
{
   typedef typename R_::RT                   RT;
   typedef typename R_::FT                   FT;
   typedef typename R_::Vector_3             Vector_3;
   typedef typename R_::Point_3              Point_3;
   typedef typename R_::Direction_3          Direction_3;
   typedef typename R_::Aff_transformation_3 Aff_transformation_3;

   typedef Rational_traits<FT>  Rat_traits;

   // Reference-counting is handled in Vector_3.
   Vector_3 base;

public:

   typedef typename Vector_3::Cartesian_const_iterator Cartesian_const_iterator;
   typedef R_                 R;

  PointH3() {}

  PointH3(const Origin &)
    : base(NULL_VECTOR) {}

  template < typename Tx, typename Ty, typename Tz >
  PointH3(const Tx & x, const Ty & y, const Tz & z,
          std::enable_if_t<std::is_convertible_v<Tx, RT> &&
                           std::is_convertible_v<Ty, RT> &&
                           std::is_convertible_v<Tz, RT>>* = 0)
    : base(x, y, z) {}

  PointH3(const FT& x, const FT& y, const FT& z)
    : base(x, y, z) {}

  PointH3(const RT& x, const RT& y, const RT& z, const RT& w)
    : base(x, y, z, w) {}

  FT    x()  const;
  FT    y()  const;
  FT    z()  const;
  const RT & hx() const;
  const RT & hy() const;
  const RT & hz() const;
  const RT & hw() const;
  const RT & homogeneous(int i) const;
  FT    cartesian(int i) const;
  FT    operator[](int i) const;


  Cartesian_const_iterator cartesian_begin() const
  {
    return base.cartesian_begin();
  }

  Cartesian_const_iterator cartesian_end() const
  {
    return base.cartesian_end();
  }

  int   dimension() const;

  Direction_3 direction() const;
  Point_3     transform( const Aff_transformation_3 & t) const;

  typename R::Boolean operator==( const PointH3<R>& p) const;
  typename R::Boolean operator!=( const PointH3<R>& p) const;
};


template < class R >
inline
const typename PointH3<R>::RT &
PointH3<R>::hx() const
{ return base.hx(); }

template < class R >
inline
const typename PointH3<R>::RT &
PointH3<R>::hy() const
{ return base.hy(); }

template < class R >
inline
const typename PointH3<R>::RT &
PointH3<R>::hz() const
{ return base.hz(); }

template < class R >
inline
const typename PointH3<R>::RT &
PointH3<R>::hw() const
{ return base.hw(); }

template < class R >
inline
typename PointH3<R>::FT
PointH3<R>::x()  const
{ return base.x(); }

template < class R >
inline
typename PointH3<R>::FT
PointH3<R>::y()  const
{ return base.y(); }

template < class R >
inline
typename PointH3<R>::FT
PointH3<R>::z()  const
{ return base.z(); }

template < class R >
inline
int
PointH3<R>::dimension() const
{ return base.dimension(); }

template < class R >
inline
typename PointH3<R>::FT
PointH3<R>::cartesian(int i) const
{
  return base.cartesian(i);
}

template < class R >
inline
const typename PointH3<R>::RT &
PointH3<R>::homogeneous(int i) const
{
  return base.homogeneous(i);
}

template < class R >
inline
typename PointH3<R>::FT
PointH3<R>::operator[](int i) const
{
  return base[i];
}

template < class R >
inline
typename PointH3<R>::Direction_3
PointH3<R>::direction() const
{ return Direction_3(*this); }

template < class R >
inline
typename R::Boolean
PointH3<R>::operator==( const PointH3<R> & p) const
{
  return base == p.base;
}

template < class R >
inline
typename R::Boolean
PointH3<R>::operator!=( const PointH3<R> & p) const
{ return !(*this == p); }


template < class R >
inline
typename R::Point_3
PointH3<R>::transform(const typename PointH3<R>::Aff_transformation_3& t) const
{ return t.transform(static_cast<const Point_3&>(*this)); }

} //namespace CGAL

#endif // CGAL_HOMOGENEOUS_POINT_3_H

