// Copyright (c) 2009-2014 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org).
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Triangulation/include/CGAL/TDS_full_cell_mirror_storage_policy.h $
// $Id: include/CGAL/TDS_full_cell_mirror_storage_policy.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)    : Samuel Hornus

#ifndef CGAL_TDS_FULL_CELL_MIRROR_STORAGE_POLICY_H
#define CGAL_TDS_FULL_CELL_MIRROR_STORAGE_POLICY_H

#include <CGAL/license/Triangulation.h>

#include <CGAL/TDS_full_cell_default_storage_policy.h>
#include <cstdint>

namespace CGAL {

// POLICY TAGS

struct TDS_full_cell_mirror_storage_policy {}; // Stores the mirror index of all vertices.

template< typename Vertex_handle, typename Full_cell_handle, typename Maximal_dimension >
struct   TFC_data< Vertex_handle, Full_cell_handle, Maximal_dimension, TDS_full_cell_mirror_storage_policy >
: public TFC_data< Vertex_handle, Full_cell_handle, Maximal_dimension, TDS_full_cell_default_storage_policy >
{
    typedef TFC_data< Vertex_handle, Full_cell_handle, Maximal_dimension, TDS_full_cell_default_storage_policy > Base;
    typedef typename Base::Vertex_handle_array          Vertex_handle_array;
    typedef typename Base::Full_cell_handle_array         Full_cell_handle_array;
    typedef typename internal::S_or_D_array< std::int_least8_t, typename Base::Dimen_plus >   Int_array;

private:
    Int_array            mirror_vertices_;

public:
    TFC_data(const int dmax)
    : Base(dmax), mirror_vertices_(dmax+1)
    {}

    void set_mirror_index(const int i, const int index)
    {
        mirror_vertices_[i] = static_cast<std::int_least8_t>(index);
    }
    int mirror_index(const int i) const
    {
        return mirror_vertices_[i];
    }
    Vertex_handle mirror_vertex(const int i, const int) const
    {
        return Base::neighbors_[i]->vertex(mirror_index(i));
    }
    void swap_vertices(const int d1, const int d2)
    {
        Base::swap_vertices(d1, d2);
        std::swap(mirror_vertices_[d1], mirror_vertices_[d2]);
        Base::neighbors_[d1]->set_mirror_index(mirror_vertices_[d1], d1);
        Base::neighbors_[d2]->set_mirror_index(mirror_vertices_[d2], d2);
    }
};

} //namespace CGAL

#endif // CGAL_TDS_FULL_CELL_MIRROR_STORAGE_POLICY_H

