// 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/Triangulation_face.h $
// $Id: include/CGAL/Triangulation_face.h b26b07a1242 $
// SPDX-License-Identifier: GPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)    : Samuel Hornus

#ifndef CGAL_TRIANGULATION_FACE_H
#define CGAL_TRIANGULATION_FACE_H

#include <CGAL/license/Triangulation.h>

#include <CGAL/disable_warnings.h>

#include <CGAL/basic.h>
#include <CGAL/Triangulation/internal/Static_or_dynamic_array.h>

namespace CGAL {

template< typename TDS >
class Triangulation_face
{
    typedef typename internal::Dimen_plus_one<typename TDS::Maximal_dimension>::type Dimen_plus;
public:
    typedef TDS                                     Triangulation_data_structure;
    typedef typename TDS::Full_cell_handle          Full_cell_handle; /* Concept */
    typedef typename TDS::Vertex_handle             Vertex_handle; /* Concept */
    typedef internal::S_or_D_array<int, Dimen_plus> Indices;

protected:
    Full_cell_handle        full_cell_;
    Indices                 indices_;

public:
    explicit Triangulation_face(Full_cell_handle s) /* Concept */
    : full_cell_(s), indices_(s->maximal_dimension()+2)
    {
        CGAL_assertion( Full_cell_handle() != s );
        clear();
    }

    explicit Triangulation_face(const int maximal_dim) /* Concept */
    : full_cell_(), indices_(maximal_dim+2)
    {
        clear();
    }

    Triangulation_face(const Triangulation_face & f) /* Concept */
    : full_cell_(f.full_cell_), indices_(f.indices_)
    {}

    int face_dimension() const /* Concept */
    {
        int i(0);
        while( -1 != indices_[i] ) ++i;
        return (i-1);
    }

    Full_cell_handle full_cell() const /* Concept */
    {
        return full_cell_;
    }

    int index(const int i) const /* Concept */
    {
        CGAL_precondition( (0 <= i) && (i <= face_dimension()) );
        return indices_[i];
    }

    Vertex_handle vertex(const int i) const /* Concept */
    {
        int j = index(i);
        if( j == -1 )
            return Vertex_handle();
        return full_cell()->vertex(j);
    }

// - - - - - - - - - - - - - - - - - -  UPDATE FUNCTIONS

    void clear() /* Concept */
    {
        const std::size_t d = indices_.size();
        for(std::size_t i = 0; i < d; ++i )
            indices_[i] = -1;
    }

    void set_full_cell(Full_cell_handle s) /* Concept */
    {
        CGAL_precondition( Full_cell_handle() != s );
        full_cell_ = s;
    }

    void set_index(const int i, const int idx) /* Concept */
    {
        CGAL_precondition( (0 <= i) && ((size_t)i+1 < indices_.size()) );
        CGAL_precondition( (0 <= idx) && ((size_t)idx < indices_.size()) );
        indices_[i] = idx;
    }
};

} //namespace CGAL

#include <CGAL/enable_warnings.h>

#endif // CGAL_TRIANGULATION_FACE_H

