/* 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/Map.h"
#include "polymake/graph/Lattice.h"
#include "polymake/graph/Decoration.h"

namespace polymake { namespace polytope {
namespace {

typedef Map<int,int> face_map_type;
typedef graph::Lattice<graph::lattice::BasicDecoration, graph::lattice::Sequential>::nodes_of_rank_type nodes_list;

template <typename IM> inline
face_map_type count(const GenericIncidenceMatrix<IM>& adj, const nodes_list& face_indices)
{
   face_map_type face_map;

   for (auto f=entire(face_indices); !f.at_end(); ++f)
      face_map[adj.col(*f).size()]++;
   return face_map;
}
}

face_map_type two_face_sizes(perl::Object p)
{
   const graph::Lattice<graph::lattice::BasicDecoration, graph::lattice::Sequential> HD(p);
   return count(adjacency_matrix(HD.graph()), HD.nodes_of_rank(3));
}

face_map_type subridge_sizes(perl::Object p)
{
   const graph::Lattice<graph::lattice::BasicDecoration, graph::lattice::Sequential> HD(p);
   int top_rank = HD.rank();
   return count(T(adjacency_matrix(HD.graph())), HD.nodes_of_rank(top_rank-3));
}

Function4perl(&two_face_sizes, "two_face_sizes(Lattice<BasicDecoration, Sequential>)");
Function4perl(&subridge_sizes, "subridge_sizes(Lattice<BasicDecoration, Sequential>)");

} }

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// mode:C++
// c-basic-offset:3
// indent-tabs-mode:nil
// End:
