// Copyright 2004 The Trustees of Indiana University.

// Use, modification and distribution is subject to the Boost Software
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)

//  Authors: Douglas Gregor
//           Andrew Lumsdaine
#include <boost/graph/sequential_vertex_coloring.hpp>
#include <boost/core/lightweight_test.hpp>
#include <boost/graph/adjacency_list.hpp>
#include <utility>

using namespace boost;

int main(int, char*[])
{
    typedef adjacency_list< listS, vecS, undirectedS > Graph;
    typedef graph_traits< Graph >::vertices_size_type vertices_size_type;
    typedef property_map< Graph, vertex_index_t >::const_type vertex_index_map;

    typedef std::pair< int, int > Edge;
    enum nodes
    {
        A,
        B,
        C,
        D,
        E,
        n
    };
    Edge edge_array[] = { Edge(A, C), Edge(B, B), Edge(B, D), Edge(B, E),
        Edge(C, B), Edge(C, D), Edge(D, E), Edge(E, A), Edge(E, B) };
    int m = sizeof(edge_array) / sizeof(Edge);
    Graph g(edge_array, edge_array + m, n);

    // Test with the normal order
    std::vector< vertices_size_type > color_vec(num_vertices(g));
    iterator_property_map< vertices_size_type*, vertex_index_map,
        vertices_size_type, vertices_size_type& >
        color(&color_vec.front(), get(vertex_index, g));
    vertices_size_type num_colors = sequential_vertex_coloring(g, color);
    BOOST_TEST(num_colors == 3);
    BOOST_TEST(get(color, (vertices_size_type)A) == 0);
    BOOST_TEST(get(color, (vertices_size_type)B) == 0);
    BOOST_TEST(get(color, (vertices_size_type)C) == 1);
    BOOST_TEST(get(color, (vertices_size_type)D) == 2);
    BOOST_TEST(get(color, (vertices_size_type)E) == 1);
    return boost::report_errors();
}