// Copyright (c) 2015-2020  GeometryFactory (France).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.2-beta1/BGL/include/CGAL/boost/graph/IO/OFF.h $
// $Id: include/CGAL/boost/graph/IO/OFF.h 431cfb5357d $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Andreas Fabri
//                 Mael Rouxel-Labbé

#ifndef CGAL_BGL_IO_OFF_H
#define CGAL_BGL_IO_OFF_H

#include <CGAL/IO/OFF.h>
#include <CGAL/IO/helpers.h>
#include <CGAL/boost/graph/IO/Generic_facegraph_builder.h>
#include <CGAL/boost/graph/IO/Generic_facegraph_printer.h>

#include <CGAL/assertions.h>
#include <CGAL/boost/graph/Euler_operations.h>
#include <CGAL/Named_function_parameters.h>
#include <CGAL/boost/graph/named_params_helper.h>

#include <fstream>
#include <iostream>
#include <string>

namespace CGAL {

////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
// Read

namespace IO {
namespace internal {

// Use CRTP to gain access to the protected members without getters/setters.
template <typename Graph, typename Point>
class OFF_builder
  : public Generic_facegraph_builder<Graph, Point, OFF_builder<Graph, Point> >
{
  typedef OFF_builder<Graph, Point>                                         Self;
  typedef Generic_facegraph_builder<Graph, Point, Self>                     Base;

  typedef typename Base::Point_container                                    Point_container;
  typedef typename Base::Face                                               Face;
  typedef typename Base::Face_container                                     Face_container;

public:
  OFF_builder(std::istream& is) : Base(is) { }

  template <typename NamedParameters>
  bool read(std::istream& is,
            Point_container& points,
            Face_container& faces,
            const NamedParameters& np)
  {
    return read_OFF(is, points, faces, np);
  }
};

// Because some packages can provide overloads with the same signature to automatically initialize
// property maps (see Surface_mesh/IO/ for example)
template <typename Graph, typename CGAL_NP_TEMPLATE_PARAMETERS>
bool read_OFF_BGL(std::istream& is,
                  Graph& g,
                  const CGAL_NP_CLASS& np)
{
  typedef typename CGAL::GetVertexPointMap<Graph, CGAL_NP_CLASS>::type  VPM;
  typedef typename boost::property_traits<VPM>::value_type                  Point;

  internal::OFF_builder<Graph, Point> builder(is);
  return builder(g, np);
}

} // namespace internal

/*!
  \ingroup PkgBGLIoFuncsOFF

  \brief reads the graph `g` from data in the input stream, using the \ref IOStreamOFF.

  The data is expected to represent a 2-manifold (possibly with borders).

  This function reads the point property as well as vertex normals (NOFF), vertex and face colors (COFF),
  and texture vertex coordinates (TOFF). Those properties are stored in property maps that
  are passed through named parameters (see below), when passed.

  Ignores comment lines which start with a hash, and lines with whitespace.

  \attention The graph `g` is not cleared, and the data from the stream are appended.

  \tparam Graph a model of `MutableFaceGraph`
  \tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"

  \param is the input stream
  \param g the graph to be built from the input data
  \param np optional \ref bgl_namedparameters "Named Parameters" described below

  \cgalNamedParamsBegin
    \cgalParamNBegin{vertex_point_map}
      \cgalParamDescription{a property map associating points to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_3` as value type}
      \cgalParamDefault{`boost::get(CGAL::vertex_point, g)`}
      \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
                      must be available in `Graph`.}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_normal_map}
      \cgalParamDescription{a property map associating normals to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Vector_3` as value type}
      \cgalParamDefault{vertex normals that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_color_map}
      \cgalParamDescription{a property map associating colors to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{vertex colors that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_texture_map}
      \cgalParamDescription{a property map associating textures to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_2` as value type}
      \cgalParamDefault{vertex textures that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{face_color_map}
      \cgalParamDescription{a property map associating colors to the faces of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%face_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{face colors that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{verbose}
      \cgalParamDescription{whether extra information is printed when an incident occurs during reading}
      \cgalParamType{Boolean}
      \cgalParamDefault{`false`}
    \cgalParamNEnd
  \cgalNamedParamsEnd

  \returns `true` if reading was successful and the resulting mesh is valid, `false` otherwise.

  \sa Overloads of this function for specific models of the concept `FaceGraph`.
*/
template <typename Graph,
          typename CGAL_NP_TEMPLATE_PARAMETERS>
bool read_OFF(std::istream& is,
              Graph& g,
              const CGAL_NP_CLASS& np = parameters::default_values()
#ifndef DOXYGEN_RUNNING
              , std::enable_if_t<!internal::is_Point_set_or_Range_or_Iterator<Graph>::value>* = nullptr
#endif
              )
{
  return internal::read_OFF_BGL(is, g, np);
}

/*!
  \ingroup PkgBGLIoFuncsOFF

  \brief reads the graph `g` from the file `fname`, using the \ref IOStreamOFF.

  The data is expected to represent a 2-manifold (possibly with borders).

  This function reads the point property as well as vertex normals (NOFF), vertex and face colors (COFF),
  and texture vertex coordinates (TOFF). Those properties are stored in property maps that
  are passed through named parameters (see below), when passed.

  Ignores comment lines which start with a hash, and lines with whitespace.

  \attention The graph `g` is not cleared, and the data from the file are appended.

  \tparam Graph a model of `MutableFaceGraph`
  \tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"

  \param fname the name of the input file
  \param g the graph to be built from the input data
  \param np optional \ref bgl_namedparameters "Named Parameters" described below

  \cgalNamedParamsBegin
    \cgalParamNBegin{vertex_point_map}
      \cgalParamDescription{a property map associating points to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_3` as value type}
      \cgalParamDefault{`boost::get(CGAL::vertex_point, g)`}
      \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
                      must be available in `Graph`.}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_normal_map}
      \cgalParamDescription{a property map associating normals to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Vector_3` as value type}
      \cgalParamDefault{vertex normals that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_color_map}
      \cgalParamDescription{a property map associating colors to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{vertex colors that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_texture_map}
      \cgalParamDescription{a property map associating textures to the vertices of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_2` as value type}
      \cgalParamDefault{vertex textures that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{face_color_map}
      \cgalParamDescription{a property map associating colors to the faces of `g`}
      \cgalParamType{a class model of `WritablePropertyMap` with `boost::graph_traits<Graph>::%face_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{face colors that may exist in the input will be ignored}
    \cgalParamNEnd

    \cgalParamNBegin{verbose}
      \cgalParamDescription{whether extra information is printed when an incident occurs during reading}
      \cgalParamType{Boolean}
      \cgalParamDefault{`false`}
    \cgalParamNEnd
  \cgalNamedParamsEnd

  \returns `true` if reading was successful and the resulting mesh is valid, `false` otherwise.

  \sa Overloads of this function for specific models of the concept `FaceGraph`.
*/
template <typename Graph,
          typename CGAL_NP_TEMPLATE_PARAMETERS>
bool read_OFF(const std::string& fname,
              Graph& g,
              const CGAL_NP_CLASS& np = parameters::default_values()
#ifndef DOXYGEN_RUNNING
              , std::enable_if_t<!internal::is_Point_set_or_Range_or_Iterator<Graph>::value>* = nullptr
#endif
              )
{
  std::ifstream is(fname);
  return read_OFF(is, g, np);
}

} // namespace IO



////////////////////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////////////////////
// Write

namespace IO {
namespace internal {

template <typename Graph, typename CGAL_NP_TEMPLATE_PARAMETERS>
bool write_OFF_BGL(std::ostream& os,
                   const Graph& g,
                   const CGAL_NP_CLASS& np)
{
  internal::Generic_facegraph_printer<std::ostream, Graph, CGAL::File_writer_OFF> printer(os);
  return printer(g, np);
}

} // namespace internal

/*!
  \ingroup PkgBGLIoFuncsOFF

  \brief writes the graph `g` in the output stream, using the \ref IOStreamOFF.

  \tparam Graph a model of `FaceListGraph` and `HalfedgeListGraph`
  \tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"

  \param os the output stream
  \param g the graph to be written
  \param np optional \ref bgl_namedparameters "Named Parameters" described below

  \cgalNamedParamsBegin
    \cgalParamNBegin{vertex_point_map}
      \cgalParamDescription{a property map associating points to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_3` as value type}
      \cgalParamDefault{`boost::get(CGAL::vertex_point, g)`}
      \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
                      must be available in `Graph`.}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_normal_map}
      \cgalParamDescription{a property map associating normals to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Vector_3` as value type}
      \cgalParamDefault{no vertex normals in the output}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_color_map}
      \cgalParamDescription{a property map associating colors to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{no vertex colors in the output}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_texture_map}
      \cgalParamDescription{a property map associating textures to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_2` as value type}
      \cgalParamDefault{no vertex textures in the output}
    \cgalParamNEnd

    \cgalParamNBegin{face_color_map}
      \cgalParamDescription{a property map associating colors to the faces of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%face_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{no face colors in the output}
    \cgalParamNEnd

    \cgalParamNBegin{stream_precision}
      \cgalParamDescription{a parameter used to set the precision (i.e. how many digits are generated) of the output stream}
      \cgalParamType{int}
      \cgalParamDefault{the precision of the stream `os`}
    \cgalParamNEnd
  \cgalNamedParamsEnd

  \returns `true` if writing was successful, `false` otherwise.

  \sa Overloads of this function for specific models of the concept `FaceGraph`.
*/
template <typename Graph,
          typename CGAL_NP_TEMPLATE_PARAMETERS>
bool write_OFF(std::ostream& os,
               const Graph& g,
               const CGAL_NP_CLASS& np = parameters::default_values()
#ifndef DOXYGEN_RUNNING
               , std::enable_if_t<!internal::is_Point_set_or_Range_or_Iterator<Graph>::value>* = nullptr
#endif
               )
{
  return internal::write_OFF_BGL(os, g, np);
}

/*!
  \ingroup PkgBGLIoFuncsOFF

  \brief writes the graph `g` in the file `fname`, using the \ref IOStreamOFF.

  \tparam Graph a model of `FaceListGraph` and `HalfedgeListGraph`
  \tparam NamedParameters a sequence of \ref bgl_namedparameters "Named Parameters"

  \param fname the name of the output file
  \param g the graph to be written
  \param np optional \ref bgl_namedparameters "Named Parameters" described below

  \cgalNamedParamsBegin
    \cgalParamNBegin{vertex_point_map}
      \cgalParamDescription{a property map associating points to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_3` as value type}
      \cgalParamDefault{`boost::get(CGAL::vertex_point, g)`}
      \cgalParamExtra{If this parameter is omitted, an internal property map for `CGAL::vertex_point_t`
                      must be available in `Graph`.}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_normal_map}
      \cgalParamDescription{a property map associating normals to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Vector_3` as value type}
      \cgalParamDefault{no vertex normals in the output}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_color_map}
      \cgalParamDescription{a property map associating colors to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{no vertex colors in the output}
    \cgalParamNEnd

    \cgalParamNBegin{vertex_texture_map}
      \cgalParamDescription{a property map associating textures to the vertices of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%vertex_descriptor`
                     as key type and `%Point_2` as value type}
      \cgalParamDefault{no vertex textures in the output}
    \cgalParamNEnd

    \cgalParamNBegin{face_color_map}
      \cgalParamDescription{a property map associating colors to the faces of `g`}
      \cgalParamType{a class model of `ReadablePropertyMap` with `boost::graph_traits<Graph>::%face_descriptor`
                     as key type and `CGAL::IO::Color` as value type}
      \cgalParamDefault{no face colors in the output}
    \cgalParamNEnd

    \cgalParamNBegin{stream_precision}
      \cgalParamDescription{a parameter used to set the precision (i.e. how many digits are generated) of the output stream}
      \cgalParamType{int}
      \cgalParamDefault{`6`}
    \cgalParamNEnd
  \cgalNamedParamsEnd

  \returns `true` if writing was successful, `false` otherwise.

  \sa Overloads of this function for specific models of the concept `FaceGraph`.
*/
template <typename Graph,
          typename CGAL_NP_TEMPLATE_PARAMETERS>
bool write_OFF(const std::string& fname,
               const Graph& g,
               const CGAL_NP_CLASS& np = parameters::default_values()
#ifndef DOXYGEN_RUNNING
               , std::enable_if_t<!internal::is_Point_set_or_Range_or_Iterator<Graph>::value>* = nullptr
#endif
               )
{
  std::ofstream os(fname);
  if(!os)
  {
    std::cerr<<"Could not create file.";
    return false;
  }

  return write_OFF(os, g, np);
}

} // namespace IO


} // namespace CGAL

#endif // CGAL_BGL_IO_OFF_H
