//=======================================================================
// Copyright 2002 Indiana University.
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek
//
// Distributed under 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)
//=======================================================================

#include <boost/config.hpp>

#include <iostream>
#include <vector>
#include <set>
#include <utility>
#include <algorithm>

#define VERBOSE 0

#include <boost/utility.hpp>
#include <boost/graph/graph_utility.hpp>
#include <boost/graph/random.hpp>
#include <boost/pending/indirect_cmp.hpp>

#include <boost/random/mersenne_twister.hpp>


enum vertex_id_t { vertex_id = 500 };
enum edge_id_t { edge_id = 501 };
namespace boost {
  BOOST_INSTALL_PROPERTY(vertex, id);
  BOOST_INSTALL_PROPERTY(edge, id);
}


#include "graph_type.hpp" // this provides a typedef for Graph

using namespace boost;

/*
  This program tests models of the MutableGraph concept.
 */

using std::cout;
using std::endl;
using std::cerr;
using std::find;


template <class Graph, class Vertex, class ID>
bool check_vertex_cleared(Graph& g, Vertex v, ID id)
{
  typename graph_traits<Graph>::vertex_iterator vi, viend;
  for (boost::tie(vi,viend) = vertices(g); vi != viend; ++vi) {
    typename graph_traits<Graph>::adjacency_iterator ai, aiend, found;
    boost::tie(ai, aiend) = adjacent_vertices(*vi, g);
    boost::indirect_cmp<ID, std::equal_to<std::size_t> > cmp(id);

#if (defined(BOOST_MSVC) && BOOST_MSVC <= 1300) && defined(__SGI_STL_PORT)
    // seeing internal compiler errors when using std::find_if()
    found = aiend;
    for ( ; ai != aiend; ++ai)
      if (cmp(*ai, v)) {
        found = ai;
        break;
      }
#else
    found = std::find_if(ai, aiend, std::bind1st(cmp,v));
#endif

    if ( found != aiend ) {
#if VERBOSE
      std::cerr << "should not have found vertex " << id[*found] << std::endl;
#endif
      return false;
    }
  }
  return true;
}

template <class Graph, class Edge, class EdgeID>
bool check_edge_added(Graph& g, Edge e, 
                      typename graph_traits<Graph>::vertex_descriptor a, 
                      typename graph_traits<Graph>::vertex_descriptor b, 
                      EdgeID edge_id, std::size_t correct_id, 
                      bool inserted)
{
  if (! (source(e, g) == a)) {
#if VERBOSE
    cerr << "    Failed, vertex a not source of e."<< endl;
#endif
    return false;
  } else if (! (target(e, g) == b)) {
#if VERBOSE
    cerr << "    Failed, vertex b not source of e."<< endl;
#endif
    return false;
  } else if (! is_adjacent(g, a, b)) {
#if VERBOSE
    cerr << "    Failed, not adj."<< endl;
#endif
    return false;
  } else if (! in_edge_set(g,e)) {
#if VERBOSE
    cerr << "    Failed, not in edge set."<< endl;
#endif
    return false;
  } else if (inserted && edge_id[e] != correct_id) {
#if VERBOSE
    cerr << "    Failed, invalid edge property."<< endl;
#endif
    return false;
  } else if (!inserted && edge_id[e] != edge_id[edge(a, b, g).first]) {
#if VERBOSE
    cerr << "    Failed, invalid edge property."<< endl;
#endif
    return false;
  } else if (num_edges(g) != count_edges(g)) {
#if VERBOSE
    cerr << "    Failed, invalid number of edges."<< endl;
#endif
    return false;
  }
  return true;
}


template <class Graph>
std::size_t count_edges(Graph& g)
{
  std::size_t e = 0;
  typename boost::graph_traits<Graph>::edge_iterator ei,ei_end;
  for (boost::tie(ei,ei_end) = edges(g); ei != ei_end; ++ei)
    ++e;
  return e;
}


int main(int, char* [])
{
  int ret = 0;
  std::size_t N = 5, E = 0;
  std::size_t old_N;

  typedef ::Graph Graph;
  Graph g;
  typedef boost::graph_traits<Graph>::vertex_descriptor Vertex;
  typedef boost::graph_traits<Graph>::edge_descriptor Edge;

  int i, j;
  std::size_t current_vertex_id = 0;
  std::size_t current_edge_id = 0;

  bool is_failed = false;

  property_map<Graph, vertex_id_t>::type vertex_id_map = get(vertex_id, g);

  property_map<Graph, edge_id_t>::type edge_id_map = get(edge_id, g);

  for (std::size_t k = 0; k < N; ++k)
    add_vertex(current_vertex_id++, g);

  // also need to test EdgeIterator graph constructor -JGS
  mt19937 gen;
    
  for (j=0; j < 10; ++j) {

    // add_edge
#if VERBOSE
    cerr << "Testing add_edge ..." << endl;
#endif
    for (i=0; i < 6; ++i) {
      Vertex a, b;
      a = random_vertex(g, gen);
      do {
        b = random_vertex(g, gen);
      } while ( a == b ); // don't do self edges
#if VERBOSE
      cerr << "add_edge(" << vertex_id_map[a] << "," << vertex_id_map[b] <<")" << endl; 
#endif
      Edge e;
      bool inserted;
      boost::tie(e, inserted) = add_edge(a, b, current_edge_id++, g);
#if VERBOSE
      std::cout << "inserted: " << inserted << std::endl;
      std::cout << "source(e,g)" << source(e,g) << endl;
      std::cout << "target(e,g)" << target(e,g) << endl;
      std::cout << "edge_id[e] = " << edge_id_map[e] << std::endl;
      print_edges2(g, vertex_id_map, edge_id_map);
      print_graph(g, vertex_id_map);
      std::cout << "finished printing" << std::endl;
      //      print_in_edges(g, vertex_id_map);
#endif
      if (! check_edge_added(g, e, a, b, edge_id_map, 
                             current_edge_id - 1, inserted)) {
        ret = -1;
        break;
      }
      ++E;
    }

    // remove_edge(u, v, g)
#if VERBOSE
    cerr << "Testing remove_edge(u, v, g) ..." << endl; is_failed = false;
#endif
    for (i = 0; i < 2; ++i) {
#if VERBOSE
      print_edges(g, vertex_id_map);
#endif
      Vertex a, b;
      
      Edge e = random_edge(g, gen);
      boost::tie(a,b) = boost::incident(e, g);
      --E;
#if VERBOSE
      cerr << "remove_edge(" << vertex_id_map[a] << "," << vertex_id_map[b] << ")" << endl;
#endif
      remove_edge(a, b, g);
#if VERBOSE
      print_graph(g, vertex_id_map);
      //      print_in_edges(g, vertex_id_map);
      print_edges(g, vertex_id_map);
#endif
      is_failed = is_failed || is_adjacent(g, a, b) || in_edge_set(g, a, b)
        || num_edges(g) != count_edges(g);
      if (is_failed)
        break;
    }
    if ( is_failed ) {
      ret = -1;
#if VERBOSE
      cerr << "    Failed."<< endl;
#endif
    } else {
#if VERBOSE
      cerr << "           Passed."<< endl;
#endif
    }

    // remove_edge(e, g)
#if VERBOSE
    cerr << "Testing remove_edge(e, g) ..." << endl; is_failed = false;
#endif
    for (i = 0; i < 2; ++i) {
#if VERBOSE
      print_edges(g, vertex_id_map);
#endif
      Vertex a, b;
      Edge e = random_edge(g, gen);
      boost::tie(a,b) = boost::incident(e, g);
      --E;
#if VERBOSE
      cerr << "remove_edge(" << vertex_id_map[a] << "," << vertex_id_map[b] << ")" << endl;
#endif
      graph_traits<Graph>::edges_size_type old_E = num_edges(g);
      remove_edge(e, g);

#if VERBOSE
      print_graph(g, vertex_id_map);
      //      print_in_edges(g, vertex_id_map);
      print_edges(g, vertex_id_map);
#endif

      is_failed = is_failed || old_E != num_edges(g) + 1
        || num_edges(g) != count_edges(g);
      if (is_failed)
        break;
    }
    if ( is_failed ) {
      ret = -1;
#if VERBOSE
      cerr << "    Failed."<< endl;
#endif
    } else {
#if VERBOSE
      cerr << "           Passed."<< endl;
#endif
    }

    // add_vertex
#if VERBOSE
    cerr << "Testing add_vertex ..." << endl; is_failed = false;
#endif
    old_N = num_vertices(g);
    graph_traits<Graph>::vertex_descriptor vid = add_vertex(g),
      vidp1 = add_vertex(g);
    vertex_id_map[vid] = current_vertex_id++;
    vertex_id_map[vidp1] = current_vertex_id++;

#if VERBOSE
    print_vertices(g,vertex_id_map);
    print_graph(g,vertex_id_map);
    //    print_in_edges(g,vertex_id_map);
    print_edges(g,vertex_id_map);
#endif
    // make sure the two added vertices are in the graph's vertex set
    {
      if (!in_vertex_set(g, vid)) {
#if VERBOSE
        cerr << "   Failed, " << vertex_id_map[vid] << " not in vertices(g)" << endl;
#endif
        ret = -1;
        break;
      }
      if (!in_vertex_set(g, vidp1)) {
#if VERBOSE
        cerr << "   Failed, " << vertex_id_map[vidp1] << " not in vertices(g)" << endl;
#endif
        ret = -1;
        break;
      }
    }

    // make sure the vertices do not have any out edges yet
    {
      graph_traits<Graph>::out_edge_iterator e, e_end;
      boost::tie(e,e_end) = out_edges(vid,g);
      if (e != e_end) {
#if VERBOSE
        cerr << "   Failed, " << vertex_id_map[vid] 
             << " should not have any out-edges yet" << endl;
#endif
        ret = -1;
        break;
      }
      boost::tie(e,e_end) = out_edges(vidp1,g);
      if (e != e_end) {
#if VERBOSE
        cerr << "   Failed, " << vertex_id_map[vidp1] 
             << " should not have any out-edges yet" << endl;
#endif
        ret = -1;
        break;
      }
    }

    // make sure the vertices do not yet appear in any of the edges
    {
      graph_traits<Graph>::edge_iterator e, e_end;
      for (boost::tie(e, e_end) = edges(g); e != e_end; ++e) {
        if (source(*e,g) == vid || target(*e,g) == vid) {
#if VERBOSE
          cerr << "   Failed, " << vertex_id_map[vid]
               << " should not have any edges" << endl;
#endif
          ret = -1;
          break;
        }
        if (source(*e,g) == vidp1 || target(*e,g) == vidp1) {
#if VERBOSE
          cerr << "   Failed, " << vertex_id_map[vidp1]
               << " should not have any edges" << endl;
#endif
          ret = -1;
          break;
        }
      }
    }
    // Make sure num_vertices(g) has been updated
    N = num_vertices(g);
    if ( (N - 2) != old_N ) {
      ret = -1;
#if VERBOSE
      cerr << "    Failed. N = " << N
           << " but should be " << old_N + 2 << endl;
#endif
      break;
    } else {
#if VERBOSE
      cerr << "           Passed."<< endl;      
#endif
    }
    // add_edge again
#if VERBOSE
    cerr << "Testing add_edge after add_vertex ..." << endl; is_failed = false;
#endif

    for (i=0; i<2; ++i) {
      Vertex a = random_vertex(g, gen), b = random_vertex(g, gen);
      while ( a == vid ) a = random_vertex(g, gen);
      while ( b == vidp1 ) b = random_vertex(g, gen);
      Edge e; 
      bool inserted;
#if VERBOSE
      cerr << "add_edge(" << vertex_id_map[vid] << "," << vertex_id_map[a] <<")" << endl;
#endif
      boost::tie(e,inserted) = add_edge(vid, a, EdgeID(current_edge_id++), g);
      
      if (! check_edge_added(g, e, vid, a, edge_id_map, current_edge_id - 1,
                             inserted)) {
        ret = -1;
        break;
      }

#if VERBOSE
      cerr << "add_edge(" << vertex_id_map[b] << "," << vertex_id_map[vidp1] <<")" << endl;
#endif
      // add_edge without plugin
      boost::tie(e,inserted) = add_edge(b, vidp1, g);
      if (inserted)
        edge_id_map[e] = current_edge_id;
      ++current_edge_id;

      if (! check_edge_added(g, e, b, vidp1, edge_id_map, 
                             current_edge_id - 1, inserted)) {
        ret = -1;
        break;
      }
    }
    
    // clear_vertex
    Vertex c = random_vertex(g, gen);
#if VERBOSE
    cerr << "Testing clear vertex ..." << endl; is_failed = false;
    print_graph(g, vertex_id_map);
    //    print_in_edges(g, vertex_id_map);
    cerr << "clearing vertex " << vertex_id_map[c] << endl;
#endif
    clear_vertex(c, g);
#if VERBOSE
    print_graph(g, vertex_id_map);
    //    print_in_edges(g, vertex_id_map);
    print_edges(g, vertex_id_map);
#endif  
    if (check_vertex_cleared(g, c, vertex_id_map) && num_edges(g) == count_edges(g)) {
#if VERBOSE
      cerr << " Passed."<< endl;
#endif
    } else {
#if VERBOSE
      cerr << "**** Failed" << endl;
#endif
      ret = -1;
      break;
    }

#if VERBOSE
    cerr << "Testing remove vertex ..." << endl; is_failed = false;
    cerr << "removing vertex " << vertex_id_map[c] << endl;
#endif

    old_N = num_vertices(g);
    remove_vertex(c, g);
#if VERBOSE
    print_graph(g,vertex_id_map);
    //    print_in_edges(g,vertex_id_map);
    print_edges(g, vertex_id_map);
#endif
    // can't check in_vertex_set here because the vertex_descriptor c
    // is no longer valid, we'll just make sure the vertex set has
    // one fewer vertex
    {
      graph_traits<Graph>::vertex_iterator v, v_end;
      boost::tie(v, v_end) = vertices(g);
      for (N = 0; v != v_end; ++v) ++N; // N = std::distance(v, v_end);
      if (N != old_N - 1) {
        ret = -1;
#if VERBOSE
        cerr << "    Failed. N = " << N
             << " but should be " << old_N - 1 << endl;
#endif
      }
    }

    N = num_vertices(g);
    if (N != old_N - 1) {
      ret = -1;
#if VERBOSE
      cerr << "    Failed. N = " << N
           << " but should be " << old_N - 1 << endl;
#endif
    } else {
#if VERBOSE
      cerr << "           Passed."<< endl;      
#endif
    }
  }
  if (ret == 0)
    std::cout << "tests passed" << std::endl;

  return ret;
}