// Copyright (c) 2006  GeometryFactory (France). All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v5.6.1/Surface_mesh_simplification/include/CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Face_count_stop_predicate.h $
// $Id: Face_count_stop_predicate.h ba3a0d7 2022-11-02T13:46:45+01:00 Mael Rouxel-Labbé
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Fernando Cacciola <fernando.cacciola@geometryfactory.com>
//
#ifndef CGAL_SURFACE_MESH_SIMPLIFICATION_POLICIES_EDGE_COLLAPSE_FACE_COUNT_STOP_PREDICATE_H
#define CGAL_SURFACE_MESH_SIMPLIFICATION_POLICIES_EDGE_COLLAPSE_FACE_COUNT_STOP_PREDICATE_H

#include <CGAL/license/Surface_mesh_simplification.h>

#include <CGAL/boost/graph/internal/helpers.h>
#include <CGAL/Surface_mesh_simplification/internal/Common.h>
#include <CGAL/Surface_mesh_simplification/Policies/Edge_collapse/Edge_profile.h>

namespace CGAL {
namespace Surface_mesh_simplification {

// Stops when the number of faces falls below a given number.
template<class TM_>
class Face_count_stop_predicate
{
public:
  typedef TM_                                                                   TM;
  typedef typename boost::graph_traits<TM>::faces_size_type                     size_type;

  Face_count_stop_predicate(const std::size_t face_count_threshold)
    : m_face_count_threshold(face_count_threshold)
  { }

  template <typename F, typename Profile>
  bool operator()(const F& /*current_cost*/,
                  const Profile& profile,
                  std::size_t /*initial_edge_count*/,
                  std::size_t /*current_edge_count*/) const
  {
    const std::size_t current_face_count = CGAL::internal::exact_num_faces(profile.surface_mesh());
    return (current_face_count < m_face_count_threshold);
  }

private:
  std::size_t m_face_count_threshold;
};

} // namespace Surface_mesh_simplification
} // namespace CGAL

#endif // CGAL_SURFACE_MESH_SIMPLIFICATION_POLICIES_EDGE_COLLAPSE_FACE_COUNT_STOP_PREDICATE_H

