/*
 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 "function.h"

DEFUN_DLD (interpolate, args, nargout, "-*- texinfo -*-\n\
@deftypefn {Function File} @var{interpolated} =\
interpolate (@var{f}, @var{g})\n\
Interpolate Function @var{g} on @var{f}'s space. \n\
@seealso{Function}\n\
@end deftypefn")
{

  int nargin = args.length ();
  octave_value retval;
  
  if (nargin < 2 || nargin > 2 || nargout > 1)
    print_usage ();
  else
    {
      if (! function_type_loaded)
        {
          function::register_type ();
          function_type_loaded = true;
          mlock ();
        }

      if (args(0).type_id () == function::static_type_id () &&
          args(1).type_id () == function::static_type_id ())
        {
          const function & u0 =
            static_cast<const function&> (args(0).get_rep ());
          const function & u1 =
            static_cast<const function&> (args(1).get_rep ());

          if (!error_state)
            {
              boost::shared_ptr<dolfin::Function>
                output (new dolfin::Function (u0.get_fun ()));
              const dolfin::Function &
                input = u1.get_fun ();

              output->interpolate (input);
              std::string name = u1.get_str ();

              retval = new function (name, output);
            }
        }
    }
  return retval;
}