/* Copyright (c) 1997-2018
   Ewgenij Gawrilow, Michael Joswig (Technische Universitaet Berlin, Germany)
   http://www.polymake.org

   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 2, or (at your option) any
   later version: http://www.gnu.org/licenses/gpl.txt.

   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.
--------------------------------------------------------------------------------
*/

#include "polymake/client.h"
#include "polymake/topaz/connected_sum.h"
#include "polymake/topaz/complex_tools.h"

namespace polymake { namespace topaz {
  
perl::Object klein_bottle()
{
   perl::Object p("SimplicialComplex");
   p.set_description() << "The Klein bottle.\n";

   const Array< Set<int> > PJP = real_projective_plane_facets();
   const std::list< Set<int> > C = connected_sum(PJP,PJP);
   
   p.take("FACETS") << C;
   p.take("DIM") << 2;
   p.take("MANIFOLD") << 1;
   p.take("CLOSED_PSEUDO_MANIFOLD") << 1;
   p.take("ORIENTED_PSEUDO_MANIFOLD") << 0;
   return p;
}

UserFunction4perl("# @category Producing from scratch\n"
                  "# The Klein bottle.\n"
                  "# @return SimplicialComplex",
                  &klein_bottle, "klein_bottle()");

} }

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// mode:C++
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// indent-tabs-mode:nil
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