/*
 Copyright (C) 2014 Eugenio Gianniti <eugenio.gianniti@mail.polimi.it>

 This program is free software; you can redistribute it and/or modify it under
 the terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3 of the License, or (at your option) any later
 version.

 This program is distributed in the hope that it will be useful, but WITHOUT
 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
 details.

 You should have received a copy of the GNU General Public License along with
 this program; if not, see <http://www.gnu.org/licenses/>.
*/

#include "meshfunction.h"

DEFUN_DLD (save, args, nargout, "-*- texinfo -*-\n\
@deftypefn {Function File} \
save (@var{MeshFunction}, @var{Name})\n\
Save a meshfunction in XDMF format.\n\
The input parameters are\n\
@itemize @bullet \n\
@item @var{MeshFunction} is the meshfunction you want to save\n\
@item @var{Name} is a string for the output name\n\
@end itemize\n\
The output is a .xdmf file.\n\
@seealso{MeshFunction}\n\
@end deftypefn")
{
  int nargin = args.length ();
  octave_value retval;

  if (nargin < 2 || nargin > 2 || nargout > 1)
    { print_usage (); }
  else
    {
      if (! meshfunction_type_loaded)
        {
          meshfunction::register_type ();
          meshfunction_type_loaded = true;
          mlock ();
        }

      if (args(0).type_id () == meshfunction::static_type_id () &&
          args(1).is_string ())
        {
          meshfunction const & mf_arg =
            static_cast<meshfunction const &> (args(0).get_rep ());
          std::string str = args(1).string_value ();

          if (!error_state)
            {
              dolfin::MeshFunction <std::size_t> const &
                mf = mf_arg.get_mf ();
              str += ".xdmf";
              try
                {
                  dolfin::File file (str);
                  file << mf;
                }
              catch (std::runtime_error &)
                { error ("error saving meshfunction"); }
              retval = 0;
            }
        }
      else
        { error ("invalid input arguments"); }
    }

  return retval;
}