// graph-tool -- a general graph modification and manipulation thingy
//
// Copyright (C) 2006-2022 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 Lesser 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 Lesser General Public License for more
// details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.

#ifndef GRAPH_REWIRING_HH
#define GRAPH_REWIRING_HH

#include "graph.hh"
#include "graph_filtering.hh"
#include "graph_util.hh"

namespace graph_tool
{
using namespace std;
using namespace boost;

struct graph_union
{
    template <class UnionGraph, class Graph, class VertexMap, class EdgeMap>
    void operator()(UnionGraph& ug, Graph& g, VertexMap vmap, EdgeMap emap)
        const
    {
        for (auto v : vertices_range(g))
        {
            if (vmap[v] < 0)
            {
                vmap[v] = add_vertex(ug);
            }
            else
            {
                auto w = vertex(vmap[v], ug);
                if (w == graph_traits<UnionGraph>::null_vertex() || w >= num_vertices(ug))
                    vmap[v] = add_vertex(ug);
                else
                    vmap[v] = w;
            }
        }

        for (auto e : edges_range(g))
            emap[e] = add_edge(vertex(vmap[source(e, g)], ug),
                               vertex(vmap[target(e, g)], ug), ug).first;
    }
};


struct property_union
{
    template <class UnionGraph, class Graph, class VertexMap, class EdgeMap,
              class UnionProp>
    void operator()(UnionGraph& ug, Graph& g, VertexMap vmap, EdgeMap emap,
                    UnionProp uprop, boost::any aprop) const
    {
        auto prop = any_cast<typename UnionProp::checked_t>(aprop);
        dispatch(ug, g, vmap, emap, uprop, prop,
                 std::is_same<typename property_traits<UnionProp>::key_type,
                              typename graph_traits<Graph>::vertex_descriptor>());
    }

    template <class UnionGraph, class Graph, class VertexMap, class EdgeMap,
              class UnionProp, class Prop>
    void dispatch(UnionGraph& ug, Graph& g, VertexMap vmap, EdgeMap,
                  UnionProp uprop, Prop prop, std::true_type) const
    {
        for (auto v : vertices_range(g))
            uprop[vertex(vmap[v], ug)] = prop[v];
    }

    template <class UnionGraph, class Graph, class VertexMap, class EdgeMap,
              class UnionProp, class Prop>
    void dispatch(UnionGraph&, Graph& g, VertexMap, EdgeMap emap,
                  UnionProp uprop, Prop prop, std::false_type) const
    {
        for (auto e : edges_range(g))
            uprop[emap[e]] = prop[e];
    }

};

} // graph_tool namespace

#endif // GRAPH_REWIRING_HH
