// Copyright (c) 1997-2000  Max-Planck-Institute Saarbruecken (Germany).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1-beta1/Nef_2/include/CGAL/Nef_2/Bounding_box_2.h $
// $Id: include/CGAL/Nef_2/Bounding_box_2.h b2f6f03d3fa $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Peter Hachenberger  <hachenberger@mpi-sb.mpg.de>

#ifndef CGAL_BOUNDING_BOX_D_H
#define CGAL_BOUNDING_BOX_D_H

#include <CGAL/license/Nef_2.h>



#include<CGAL/Box_intersection_d/Box_d.h>

namespace CGAL {

// template<typename T, typename K> class Bounding_box_2;

template<class T,typename Kernel>
class Bounding_box_2 {

  typedef typename Kernel::Point_2 Point;
  typedef typename Kernel::Standard_point_2 SPoint;
  typedef typename Kernel::Standard_direction_2 SDirection;

 public:
  template<typename Vertex_iterator>
    Bounding_box_2(Vertex_iterator , Vertex_iterator ) {
    CGAL_error_msg( "dummy interface");
  }

  Point intersection_ray_bbox(const SPoint& , const SDirection& ) {
    CGAL_error_msg( "dummy interface");
    return Point();
  }
};


template<typename Kernel>
class Bounding_box_2<Tag_false,Kernel>
  : Box_intersection_d::Box_d<typename Kernel::Standard_FT,2> {

  typedef typename Kernel::Standard_FT SFT;
  typedef typename Kernel::Standard_RT SRT;
  typedef typename Box_intersection_d::Box_d<SFT,2> Box;
  typedef typename Kernel::Point_2 Point;
  typedef typename Kernel::Standard_point_2 SPoint;
  typedef typename Kernel::Standard_direction_2 SDirection;
  //  typedef typename Kernel::Direction_2 Direction;
  typedef typename Kernel::Standard_line_2 SLine;

  template<typename Vertex_handle>
    static SFT* vertex2point(Vertex_handle v, SFT p[2]) {
    p[0] = v->point()[0];
    p[1] = v->point()[1];
    return p;
  }

 public:

  using Box::extend;
  using Box::min_coord;
  using Box::max_coord;

  template<typename Vertex_iterator>
    Bounding_box_2(Vertex_iterator begin, Vertex_iterator end) {
    SFT p[2];
    vertex2point(begin,p);
    *((Box*) this) = Box(p,p);
    //    (Box) *this = Box(p,p);
    for(++begin;begin != end; ++begin)
      extend(vertex2point(begin,p));
  }

  Point intersection_ray_bbox(const SPoint& p, const SDirection& d) {
    int dim = d.delta(0) == 0 ? 1 : 0;
    CGAL_assertion(d.delta(dim) != 0);
    SPoint minmax;
    if(dim == 0)
      minmax = d.delta(dim) < 0
        ? SPoint(this->min_coord(0).numerator(),SRT(0),this->min_coord(0).denominator())
        : SPoint(this->max_coord(0).numerator(),SRT(0),this->max_coord(0).denominator());
    else
      minmax = d.delta(dim) < 0
        ? SPoint(SRT(0),this->min_coord(0).numerator(),this->min_coord(0).denominator())
        : SPoint(SRT(0),this->max_coord(0).numerator(),this->max_coord(0).denominator());
    SLine l1(p,d);
    SLine l2 = dim == 0
      ? SLine(minmax, SDirection(0,1))
      : SLine(minmax, SDirection(1,0));

    Object o = intersection(l1,l2);
    if(assign(minmax,o)) {
      Kernel K;
      return K.construct_point(minmax);
    }
    CGAL_error_msg( "code not robust - l2 must be constructed to"
                       " be non-collinear with l1");
    return Point();
  }

};

} //namespace CGAL
#endif // CGAL_BOUNDING_BOX_D_H
