// graph-tool -- a general graph modification and manipulation thingy
//
// Copyright (C) 2006-2018 Tiago de Paula Peixoto <tiago@skewed.de>
//
// 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 "graph_filtering.hh"
#include "graph_selectors.hh"
#include "graph_properties.hh"
#include "graph.hh"

#include "graph_augment.hh"

#include <boost/graph/edmonds_karp_max_flow.hpp>

#include <boost/bind.hpp>

using namespace graph_tool;
using namespace boost;

struct get_edmonds_karp_max_flow
{
    template <class Graph, class VertexIndex, class EdgeIndex, class CapacityMap,
              class ResidualMap>
    void operator()(Graph& g, VertexIndex vertex_index, EdgeIndex edge_index,
                    size_t max_e, size_t src, size_t sink, CapacityMap cm,
                    ResidualMap res) const
    {
        typedef typename graph_traits<Graph>::edge_descriptor edge_t;
        unchecked_vector_property_map<bool,EdgeIndex>
            augmented(edge_index, max_e);
        unchecked_vector_property_map<edge_t,EdgeIndex>
            reverse_map(edge_index, max_e);
        unchecked_vector_property_map<default_color_type,VertexIndex>
            color(vertex_index, num_vertices(g));
        unchecked_vector_property_map<edge_t,VertexIndex>
            pred(vertex_index, num_vertices(g));

        typedef typename std::remove_const<Graph>::type GT;
        GT& u = const_cast<GT&>(g);
        augment_graph(u,
                      augmented.get_checked(),
                      get_checked(cm),
                      reverse_map.get_checked(),
                      get_checked(res));

        boost::edmonds_karp_max_flow(g, vertex(src, g), vertex(sink, g),
                                     get_unchecked(cm),
                                     get_unchecked(res),
                                     reverse_map, color, pred);

        deaugment_graph(u, augmented.get_checked());
    }
};


void edmonds_karp_max_flow(GraphInterface& gi, size_t src, size_t sink,
                           boost::any capacity, boost::any res)
{
    run_action<graph_tool::detail::always_directed>()
        (gi, std::bind(get_edmonds_karp_max_flow(),
                       std::placeholders::_1, gi.get_vertex_index(), gi.get_edge_index(),
                       gi.get_edge_index_range(),
                       src, sink, std::placeholders::_2, std::placeholders::_3),
         writable_edge_scalar_properties(), writable_edge_scalar_properties())
        (capacity,res);
}
