// Copyright (c) 2005 Rijksuniversiteit Groningen (Netherlands)
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1-beta1/Skin_surface_3/include/CGAL/Skin_surface_refinement_policy_3.h $
// $Id: include/CGAL/Skin_surface_refinement_policy_3.h b2f6f03d3fa $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s)     : Nico Kruithof <Nico@cs.rug.nl>

#ifndef CGAL_SKIN_SURFACE_REFINEMENT_POLICY_3_H
#define CGAL_SKIN_SURFACE_REFINEMENT_POLICY_3_H

#include <CGAL/license/Skin_surface_3.h>

#include <CGAL/Cartesian.h>
#include <CGAL/Cartesian_converter.h>
#include <CGAL/intersection_3.h>

#include <CGAL/Polyhedron_3.h>
#include <CGAL/Skin_surface_polyhedral_items_3.h>

namespace CGAL {

template <class SkinSurface_3, class Polyhedron_3>
class Skin_surface_refinement_policy_3
{
public:
  typedef SkinSurface_3                           Skin_surface;
  typedef Polyhedron_3                            Polyhedron;
  typedef typename Polyhedron::Traits             P_traits;

  typedef typename Polyhedron::Vertex_handle      P_vertex_handle;

  typedef typename P_traits::RT          P_rt;
  typedef typename P_traits::Point_3     P_point;
  typedef typename P_traits::Segment_3   P_segment;
  typedef typename P_traits::Line_3      P_line;
  typedef typename P_traits::Vector_3    P_vector;
  typedef typename P_traits::Plane_3     P_plane;

  Skin_surface_refinement_policy_3(Skin_surface const& skin) : ss_3(skin) { }

  P_point to_surface(P_vertex_handle vh) const
  {
    typename Skin_surface::Bare_point result =
      Cartesian_converter<P_traits,
      typename Skin_surface::Geometric_traits::Kernel>()(vh->point());
    ss_3.intersect_with_transversal_segment(result);
    return
      Cartesian_converter
      <typename Skin_surface::Geometric_traits::Kernel, P_traits>()( result );
  }

  P_vector normal(P_vertex_handle vh) const
  {
    // Convert to and from the skin surface kernel
    typename Skin_surface::Bare_point p =
      Cartesian_converter<P_traits,
        typename Skin_surface::Geometric_traits::Kernel>()(vh->point());
    return Cartesian_converter<typename Skin_surface::Geometric_traits::Kernel,
                               P_traits>()( ss_3.normal(p));
  }

protected:
  const Skin_surface &ss_3;
};

template <class SkinSurfaceBase_3, class P_Traits, class SkinSurface_3>
class Skin_surface_refinement_policy_3<SkinSurfaceBase_3,
                                       Polyhedron_3<P_Traits,
                                       Skin_surface_polyhedral_items_3<
                                         SkinSurface_3> > >
{
public:
  typedef SkinSurfaceBase_3                          Skin_surface;
  typedef Polyhedron_3<P_Traits,
    Skin_surface_polyhedral_items_3<SkinSurface_3> > Polyhedron;
  typedef typename Polyhedron::Traits                P_traits;

  typedef typename Polyhedron::Vertex_handle      P_vertex_handle;

  typedef typename P_traits::RT          P_rt;
  typedef typename P_traits::Point_3     P_point;
  typedef typename P_traits::Segment_3   P_segment;
  typedef typename P_traits::Line_3      P_line;
  typedef typename P_traits::Vector_3    P_vector;
  typedef typename P_traits::Plane_3     P_plane;

  Skin_surface_refinement_policy_3(Skin_surface const& skin) : ss_3(skin) {
  }

  P_point to_surface(P_vertex_handle vh) const
  {
    typename Skin_surface::Bare_point result =
      Cartesian_converter<P_traits,
        typename Skin_surface::Geometric_traits::Kernel>()(vh->point());

     ss_3.intersect_with_transversal_segment(result,
                                             vh->halfedge()->facet()->tmc_ch);

    return
      Cartesian_converter<typename Skin_surface::Geometric_traits::Kernel,
                          P_traits>()( result );
  }

  P_vector normal(P_vertex_handle vh) const
  {
    // Convert to and from the skin surface kernel
    typename Skin_surface::Bare_point p =
      Cartesian_converter<P_traits,
         typename Skin_surface::Geometric_traits::Kernel>()(vh->point());
    return
      Cartesian_converter<
        typename Skin_surface::Geometric_traits::Kernel,
        P_traits>()( ss_3.normal(p, vh->halfedge()->facet()->tmc_ch) );
  }

protected:
  Skin_surface const &ss_3;
};

} //namespace CGAL


#endif // CGAL_SKIN_SURFACE_REFINEMENT_POLICY_3_H
