// Copyright (c) 1997
// Utrecht University (The Netherlands),
// ETH Zurich (Switzerland),
// INRIA Sophia-Antipolis (France),
// Max-Planck-Institute Saarbruecken (Germany),
// and Tel-Aviv University (Israel).  All rights reserved.
//
// This file is part of CGAL (www.cgal.org);
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/Stream_support/include/CGAL/IO/VRML/VRML_2_ostream.h $
// $Id: include/CGAL/IO/VRML/VRML_2_ostream.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s)     : Andreas Fabri
//                 Lutz Kettner <kettner@inf.ethz.ch>
//                 Herve Bronnimann
//                 Mariette Yvinec <Mariette.Yvinec@sophia.inria.fr>

#ifndef CGAL_IO_VRML_VRML_2_OSTREAM_H
#define CGAL_IO_VRML_VRML_2_OSTREAM_H

#include <CGAL/basic.h>
#include <iostream>
#include <CGAL/boost/graph/named_params_helper.h>

namespace CGAL {

class VRML_2_ostream
{
public:
  VRML_2_ostream() : m_os(nullptr) {}
  VRML_2_ostream(std::ostream& o) : m_os(&o) { header(); }
  ~VRML_2_ostream() noexcept(!CGAL_ASSERTIONS_ENABLED)
  {
    CGAL_destructor_assertion_catch(
      close();
    );
  }

  void open(std::ostream& o) { m_os = &o; header(); }
  void close()
  {
    if(m_os)
      footer();
    m_os = 0;
  }

  bool fail() const { return m_os->fail(); }
  bool good() const { return m_os->good(); }

  void precision(const int p) { m_os->precision(p); }
  std::streamsize precision() const { return m_os->precision(); }

  explicit operator bool () { return m_os && !m_os->fail(); }

  std::ostream& os() const
  {
    // The behavior if m_os == nullptr could be changed to return
    // cerr or a file handle to /dev/null. The latter one would
    // mimic the behavior that one can still use a stream with
    // an invalid stream, but without producing any output.
    CGAL_assertion( m_os != nullptr );
    return *m_os;
  }

private:
  void header()
  {
    os() << "#VRML V2.0 utf8\n"
            "# File written with the help of the CGAL Library\n"
            "#-- Begin of file header\n"
            "Group {\n"
            "    children [\n"
            "        Shape {\n"
            "          appearance DEF A1 Appearance {\n"
            "            material Material {\n"
            "              diffuseColor .6 .5 .9\n"
            "            }\n         }\n"
            "            appearance\n"
            "                Appearance {\n"
            "                    material DEF Material Material {}\n"
            "                }\n"
            "            geometry nullptr\n"
            "        }\n"
            "        #-- End of file header" << std::endl;
  }

  void footer()
  {
    os() << "        #-- Begin of file footer\n"
            "    ]\n"
            "}\n"
            "#-- End of file footer" << std::endl;
  }

  std::ostream* m_os;
};

inline VRML_2_ostream& operator<<(VRML_2_ostream& os,
                                  const char* s)
{
  os.os() << s;
  return os;
}

inline VRML_2_ostream& operator<<(VRML_2_ostream& os,
                                  const double& d)
{
  os.os() << d;
  return os;
}

template<typename NP>
void set_stream_precision_from_NP(VRML_2_ostream& os, const NP& np)
{
  return set_stream_precision_from_NP(os.os(), np);
}
} // namespace CGAL

#endif // CGAL_IO_VRML_2_OSTREAM_H

#ifdef CGAL_TETRAHEDRON_3_H
#ifndef CGAL_IO_VRML_2_TETRAHEDRON_3
#define CGAL_IO_VRML_2_TETRAHEDRON_3

namespace CGAL {

template <class R >
VRML_2_ostream&
operator<<(VRML_2_ostream& os,
           const Tetrahedron_3<R > &t)
{
  const char *Indent = "                                    ";
  os << "        Group {\n"
        "            children [\n"
        "                Shape {\n"
        "                    appearance\n"
        "                        Appearance {\n"
        "                            material USE Material\n"
        "                        } #Appearance\n"
        "                    geometry\n"
        "                        IndexedFaceSet {\n"
        "                            coord Coordinate {\n"
        "                                point [ \n"
     << Indent << "  "
     << CGAL::to_double(t[0].x()) << " "
     << CGAL::to_double(t[0].y()) << " "
     << CGAL::to_double(t[0].z()) << " ,\n"
     << Indent << "  "
     << CGAL::to_double(t[1].x()) << " "
     << CGAL::to_double(t[1].y()) << " "
     << CGAL::to_double(t[1].z()) << " ,\n"
     << Indent << "  "
     << CGAL::to_double(t[2].x()) << " "
     << CGAL::to_double(t[2].y()) << " "
     << CGAL::to_double(t[2].z()) << " ,\n"
     << Indent << "  "
     << CGAL::to_double(t[3].x()) << " "
     << CGAL::to_double(t[3].y()) << " "
     << CGAL::to_double(t[3].z()) <<
     "\n                                ]\n"
     "                            }\n"
     "                            solid   FALSE\n"
     << Indent << "coordIndex  [ 0,1,2,-1, 1,3,2,-1,\n"
     << Indent << "              0,2,3,-1, 0,3,1,-1 ]\n"
     "                        } #IndexedFaceSet\n"
     "                } #Shape\n"
     "            ] #children\n"
     "        } #Group\n";

  return os;
}

} //namespace CGAL

#endif // CGAL_IO_VRML_2_TETRAHEDRON_3
#endif // CGAL_TETRAHEDRON_3_H

#ifdef CGAL_POINT_3_H
#ifndef CGAL_IO_VRML_2_POINT_3
#define CGAL_IO_VRML_2_POINT_3

namespace CGAL {

template <class R >
VRML_2_ostream&
operator<<(VRML_2_ostream& os,
           const Point_3<R > &p)
{
  const char *Indent = "                                    ";
  os << "        Group {\n"
        "            children [\n"
        "                Shape {\n"
        "                    appearance USE A1\n"
        "                    geometry\n"
        "                        PointSet {\n"
        "                            coord Coordinate {\n"
        "                                point [ ";
  os << CGAL::to_double(p.x()) << " " << CGAL::to_double(p.y()) << " " << CGAL::to_double(p.z()) << " ]\n";
  os << Indent << "}\n";
  os << Indent << "} # PointSet\n";
  os << "                } #Shape\n"
        "            ] #children\n"
        "        } #Group\n";
  return os;
}

} //namespace CGAL

#endif // CGAL_IO_VRML_2_POINT_3
#endif // CGAL_POINT_3_H

#ifdef CGAL_TRIANGLE_3_H
#ifndef CGAL_IO_VRML_2_TRIANGLE_3
#define CGAL_IO_VRML_2_TRIANGLE_3

namespace CGAL {

template <class R >
VRML_2_ostream&
operator<<(VRML_2_ostream& os,
           const Triangle_3<R > &t)
{
  const char *Indent = "                                    ";
  os << "        Group {\n"
        "            children [\n"
        "                Shape {\n"
        "                    appearance USE A1\n"
        "                    geometry\n"
        "                        IndexedLineSet {\n"
        "                            coord Coordinate {\n"
        "                                point [ \n";
  os << Indent ;
  os << CGAL::to_double(t[0].x()) << " " << CGAL::to_double(t[0].y()) << " " << CGAL::to_double(t[0].z()) << ",\n";
  os << Indent;
  os << CGAL::to_double(t[1].x()) << " " << CGAL::to_double(t[1].y()) << " " << CGAL::to_double(t[1].z()) << ",\n";
  os << Indent;
  os << CGAL::to_double(t[2].x()) << " " << CGAL::to_double(t[2].y()) << " " << CGAL::to_double(t[2].z()) << " ]\n";
  os << Indent << "}\n" << Indent << "coordIndex [ 0 1, 1 2, 2 0 -1 ]\n";
  os << Indent << "} # IndexedLineSet\n";
  os << "                } #Shape\n"
        "            ] #children\n"
        "        } #Group\n";

  return os;
}

} // namespace CGAL

#endif // CGAL_IO_VRML_2_TRIANGLE_3
#endif // CGAL_TRIANGLE_3_H

#ifdef CGAL_SEGMENT_3_H
#ifndef CGAL_IO_VRML_2_SEGMENT_3
#define CGAL_IO_VRML_2_SEGMENT_3

namespace CGAL {

template <class R >
VRML_2_ostream&
operator<<(VRML_2_ostream& os,
           const Segment_3<R > &s)
{
  const char *Indent = "                                    ";
  os << "        Group {\n"
        "            children [\n"
        "                Shape {\n"
        "                    appearance USE A1\n"
        "                    geometry\n"
        "                        IndexedLineSet {\n"
        "                            coord Coordinate {\n"
        "                                point [ \n";
  os << Indent << CGAL::to_double(s.source().x())
     << " " << CGAL::to_double(s.source().y())
     << " " << CGAL::to_double(s.source().z()) << ",\n";
  os << Indent;
  os << CGAL::to_double(s.target().x())
     << " " << CGAL::to_double(s.target().y())
     << " " << CGAL::to_double(s.target().z()) << " ]\n";
  os << Indent << "}\n" << Indent << "coordIndex [ 0 1 -1 ]\n";
  os << Indent << "} # IndexedLineSet\n";
  os << "                } #Shape\n"
        "            ] #children\n"
        "        } #Group\n";

  return os;
}

} //namespace CGAL

#endif // CGAL_IO_VRML_2_SEGMENT_3
#endif // CGAL_SEGMENT_3_H

#ifdef CGAL_SPHERE_3_H
#ifndef CGAL_IO_VRML_2_SPHERE_3
#define CGAL_IO_VRML_2_SPHERE_3

namespace CGAL {

template <class R >
VRML_2_ostream&
operator<<(VRML_2_ostream& os,
           const Sphere_3<R > &s)
{
  os << "        Group {\n"
        "            children [\n"
        "              Transform {\n"
        "                translation ";
  os << CGAL::to_double(s.center().x()) << " "
     << CGAL::to_double(s.center().y()) << " "
     << CGAL::to_double(s.center().z()) << "\n";
  os << "                children Shape {\n"
        "                    appearance USE A1\n"
        "                    geometry\n"
        "                        Sphere { "
        "radius ";
  os << std::sqrt(CGAL::to_double(s.squared_radius())) <<" }\n";
  os << "                } #children Shape\n"
        "              } # Transform\n"
        "            ] #children\n"
        "        } #Group\n";

  return os;
}

} //namespace CGAL

#endif // CGAL_IO_VRML_VRML_2_SEGMENT_3

#endif // CGAL_SPHERE_3_H

