//=======================================================================
// Copyright 1997, 1998, 1999, 2000 University of Notre Dame.
// Copyright 2010 Thomas Claveirole
// Authors: Andrew Lumsdaine, Lie-Quan Lee, Jeremy G. Siek, Thomas Claveirole
//
// 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)
//=======================================================================

#ifndef BOOST_GRAPH_ADJACENCY_LIST_HPP
#define BOOST_GRAPH_ADJACENCY_LIST_HPP


#include <boost/config.hpp>

#include <vector>
#include <list>
#include <set>

#include <boost/unordered_set.hpp>

#if !defined BOOST_NO_SLIST
#  ifdef BOOST_SLIST_HEADER
#    include BOOST_SLIST_HEADER
#  else
#    include <slist>
#  endif
#endif

#include <boost/scoped_ptr.hpp>

#include <boost/graph/graph_traits.hpp>
#include <boost/graph/graph_mutability_traits.hpp>
#include <boost/graph/graph_selectors.hpp>
#include <boost/property_map/property_map.hpp>
#include <boost/mpl/if.hpp>
#include <boost/mpl/and.hpp>
#include <boost/mpl/not.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/graph/detail/edge.hpp>
#include <boost/type_traits/is_same.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/graph/properties.hpp>
#include <boost/graph/named_graph.hpp>

namespace boost {

  //===========================================================================
  // Selectors for the VertexList and EdgeList template parameters of
  // adjacency_list, and the container_gen traits class which is used
  // to map the selectors to the container type used to implement the
  // graph.

#if !defined BOOST_NO_SLIST
  struct slistS {};
#endif

  struct vecS  { };
  struct listS { };
  struct setS { };
  struct mapS  { };
  struct multisetS { };
  struct multimapS { };
  struct hash_setS { };
  struct hash_mapS { };
  struct hash_multisetS { };
  struct hash_multimapS { };

  template <class Selector, class ValueType>
  struct container_gen { };

  template <class ValueType>
  struct container_gen<listS, ValueType> {
    typedef std::list<ValueType> type;
  };
#if !defined BOOST_NO_SLIST
  template <class ValueType>
  struct container_gen<slistS, ValueType> {
    typedef BOOST_STD_EXTENSION_NAMESPACE::slist<ValueType> type;
  };
#endif
  template <class ValueType>
  struct container_gen<vecS, ValueType> {
    typedef std::vector<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<mapS, ValueType> {
    typedef std::set<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<setS, ValueType> {
    typedef std::set<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<multisetS, ValueType> {
    typedef std::multiset<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<multimapS, ValueType> {
    typedef std::multiset<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<hash_setS, ValueType> {
    typedef boost::unordered_set<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<hash_mapS, ValueType> {
    typedef boost::unordered_set<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<hash_multisetS, ValueType> {
    typedef boost::unordered_multiset<ValueType> type;
  };

  template <class ValueType>
  struct container_gen<hash_multimapS, ValueType> {
    typedef boost::unordered_multiset<ValueType> type;
  };

  template <class StorageSelector>
  struct parallel_edge_traits { };

  template <>
  struct parallel_edge_traits<vecS> {
    typedef allow_parallel_edge_tag type; };

  template <>
  struct parallel_edge_traits<listS> {
    typedef allow_parallel_edge_tag type; };

#if !defined BOOST_NO_SLIST
  template <>
  struct parallel_edge_traits<slistS> {
    typedef allow_parallel_edge_tag type; };
#endif

  template <>
  struct parallel_edge_traits<setS> {
    typedef disallow_parallel_edge_tag type; };

  template <>
  struct parallel_edge_traits<multisetS> {
    typedef allow_parallel_edge_tag type; };

  template <>
  struct parallel_edge_traits<hash_setS> {
    typedef disallow_parallel_edge_tag type;
  };

  // mapS is obsolete, replaced with setS
  template <>
  struct parallel_edge_traits<mapS> {
    typedef disallow_parallel_edge_tag type; };

  template <>
  struct parallel_edge_traits<hash_mapS> {
    typedef disallow_parallel_edge_tag type;
  };

  template <>
  struct parallel_edge_traits<hash_multisetS> {
    typedef allow_parallel_edge_tag type;
  };

  template <>
  struct parallel_edge_traits<hash_multimapS> {
    typedef allow_parallel_edge_tag type;
  };

  namespace detail {
    template <class Directed> struct is_random_access {
      enum { value = false};
      typedef mpl::false_ type;
    };
    template <>
    struct is_random_access<vecS> {
      enum { value = true };
      typedef mpl::true_ type;
    };

  } // namespace detail

  template <typename Selector> struct is_distributed_selector: mpl::false_ {};


  //===========================================================================
  // The adjacency_list_traits class, which provides a way to access
  // some of the associated types of an adjacency_list type without
  // having to first create the adjacency_list type. This is useful
  // when trying to create interior vertex or edge properties who's
  // value type is a vertex or edge descriptor.

  template <class OutEdgeListS = vecS,
            class VertexListS = vecS,
            class DirectedS = directedS,
            class EdgeListS = listS>
  struct adjacency_list_traits
  {
    typedef typename detail::is_random_access<VertexListS>::type
      is_rand_access;
    typedef typename DirectedS::is_bidir_t is_bidir;
    typedef typename DirectedS::is_directed_t is_directed;

    typedef typename mpl::if_<is_bidir,
      bidirectional_tag,
      typename mpl::if_<is_directed,
        directed_tag, undirected_tag
      >::type
    >::type directed_category;

    typedef typename parallel_edge_traits<OutEdgeListS>::type
      edge_parallel_category;

    typedef std::size_t vertices_size_type;
    typedef void* vertex_ptr;
    typedef typename mpl::if_<is_rand_access,
      vertices_size_type, vertex_ptr>::type vertex_descriptor;
    typedef detail::edge_desc_impl<directed_category, vertex_descriptor>
      edge_descriptor;

  private:
    // Logic to figure out the edges_size_type
    struct dummy {};
    typedef typename container_gen<EdgeListS, dummy>::type EdgeContainer;
    typedef typename DirectedS::is_bidir_t BidirectionalT;
    typedef typename DirectedS::is_directed_t DirectedT;
    typedef typename mpl::and_<DirectedT,
      typename mpl::not_<BidirectionalT>::type >::type on_edge_storage;
  public:
    typedef typename mpl::if_<on_edge_storage,
       std::size_t, typename EdgeContainer::size_type
    >::type edges_size_type;

  };

} // namespace boost

#include <boost/graph/detail/adjacency_list.hpp>

namespace boost {

  //===========================================================================
  // The adjacency_list class.
  //

  template <class OutEdgeListS = vecS, // a Sequence or an AssociativeContainer
            class VertexListS = vecS, // a Sequence or a RandomAccessContainer
            class DirectedS = directedS,
            class VertexProperty = no_property,
            class EdgeProperty = no_property,
            class GraphProperty = no_property,
            class EdgeListS = listS>
  class adjacency_list
    : public detail::adj_list_gen<
      adjacency_list<OutEdgeListS,VertexListS,DirectedS,
                     VertexProperty,EdgeProperty,GraphProperty,EdgeListS>,
      VertexListS, OutEdgeListS, DirectedS,
      VertexProperty, EdgeProperty,
      GraphProperty, EdgeListS>::type,
      // Support for named vertices
      public graph::maybe_named_graph<
        adjacency_list<OutEdgeListS,VertexListS,DirectedS,
                       VertexProperty,EdgeProperty,GraphProperty,EdgeListS>,
        typename adjacency_list_traits<OutEdgeListS, VertexListS, DirectedS,
                                       EdgeListS>::vertex_descriptor,
        VertexProperty>
  {
      public:
    typedef GraphProperty graph_property_type;
    typedef typename lookup_one_property<GraphProperty, graph_bundle_t>::type graph_bundled;

    typedef VertexProperty vertex_property_type;
    typedef typename lookup_one_property<VertexProperty, vertex_bundle_t>::type vertex_bundled;

    typedef EdgeProperty edge_property_type;
    typedef typename lookup_one_property<EdgeProperty, edge_bundle_t>::type edge_bundled;

  private:
    typedef adjacency_list self;
    typedef typename detail::adj_list_gen<
      self, VertexListS, OutEdgeListS, DirectedS,
      vertex_property_type, edge_property_type, GraphProperty, EdgeListS
    >::type Base;

  public:
    typedef typename Base::stored_vertex stored_vertex;
    typedef typename Base::vertices_size_type vertices_size_type;
    typedef typename Base::edges_size_type edges_size_type;
    typedef typename Base::degree_size_type degree_size_type;
    typedef typename Base::vertex_descriptor vertex_descriptor;
    typedef typename Base::edge_descriptor edge_descriptor;
    typedef OutEdgeListS out_edge_list_selector;
    typedef VertexListS vertex_list_selector;
    typedef DirectedS directed_selector;
    typedef EdgeListS edge_list_selector;


    adjacency_list(const GraphProperty& p = GraphProperty())
      : m_property(new graph_property_type(p))
    { }

    adjacency_list(const adjacency_list& x)
      : Base(x), m_property(new graph_property_type(*x.m_property))
    { }

    adjacency_list& operator=(const adjacency_list& x) {
      // TBD: probably should give the strong guarantee
      if (&x != this) {
        Base::operator=(x);

        // Copy/swap the ptr since we can't just assign it...
        property_ptr p(new graph_property_type(*x.m_property));
        m_property.swap(p);
      }
      return *this;
    }

    // Required by Mutable Graph
    adjacency_list(vertices_size_type num_vertices,
                          const GraphProperty& p = GraphProperty())
      : Base(num_vertices), m_property(new graph_property_type(p))
    { }

    // Required by Iterator Constructible Graph
    template <class EdgeIterator>
    adjacency_list(EdgeIterator first, EdgeIterator last,
                          vertices_size_type n,
                          edges_size_type = 0,
                          const GraphProperty& p = GraphProperty())
      : Base(n, first, last), m_property(new graph_property_type(p))
    { }

    template <class EdgeIterator, class EdgePropertyIterator>
    adjacency_list(EdgeIterator first, EdgeIterator last,
                          EdgePropertyIterator ep_iter,
                          vertices_size_type n,
                          edges_size_type = 0,
                          const GraphProperty& p = GraphProperty())
      : Base(n, first, last, ep_iter), m_property(new graph_property_type(p))
    { }

    void swap(adjacency_list& x) {
      // Is there a more efficient way to do this?
      adjacency_list tmp(x);
      x = *this;
      *this = tmp;
    }

    void clear()
    {
      this->clearing_graph();
      Base::clear();
    }

#ifndef BOOST_GRAPH_NO_BUNDLED_PROPERTIES
    // Directly access a vertex or edge bundle
    vertex_bundled& operator[](vertex_descriptor v)
    { return get(vertex_bundle, *this)[v]; }

    const vertex_bundled& operator[](vertex_descriptor v) const
    { return get(vertex_bundle, *this)[v]; }

    edge_bundled& operator[](edge_descriptor e)
    { return get(edge_bundle, *this)[e]; }

    const edge_bundled& operator[](edge_descriptor e) const
    { return get(edge_bundle, *this)[e]; }

    graph_bundled& operator[](graph_bundle_t)
    { return get_property(*this); }

    graph_bundled const& operator[](graph_bundle_t) const
    { return get_property(*this); }
#endif

    //  protected:  (would be protected if friends were more portable)
    typedef scoped_ptr<graph_property_type> property_ptr;
    property_ptr  m_property;
  };

#define ADJLIST_PARAMS \
    typename OEL, typename VL, typename D, typename VP, typename EP, \
    typename GP, typename EL
#define ADJLIST adjacency_list<OEL,VL,D,VP,EP,GP,EL>

  template<ADJLIST_PARAMS, typename Tag, typename Value>
  inline void set_property(ADJLIST& g, Tag tag, Value const& value) {
    get_property_value(*g.m_property, tag) = value;
  }

  template<ADJLIST_PARAMS, typename Tag>
  inline typename graph_property<ADJLIST, Tag>::type&
  get_property(ADJLIST& g, Tag tag) {
    return get_property_value(*g.m_property, tag);
  }

  template<ADJLIST_PARAMS, typename Tag>
  inline typename graph_property<ADJLIST, Tag>::type const&
  get_property(ADJLIST const& g, Tag tag) {
    return get_property_value(*g.m_property, tag);
  }

  // dwa 09/25/00 - needed to be more explicit so reverse_graph would work.
  template <class Directed, class Vertex,
      class OutEdgeListS,
      class VertexListS,
      class DirectedS,
      class VertexProperty,
      class EdgeProperty,
      class GraphProperty, class EdgeListS>
  inline Vertex
  source(const detail::edge_base<Directed,Vertex>& e,
         const adjacency_list<OutEdgeListS, VertexListS, DirectedS,
                 VertexProperty, EdgeProperty, GraphProperty, EdgeListS>&)
  {
    return e.m_source;
  }

  template <class Directed, class Vertex, class OutEdgeListS,
      class VertexListS, class DirectedS, class VertexProperty,
      class EdgeProperty, class GraphProperty, class EdgeListS>
  inline Vertex
  target(const detail::edge_base<Directed,Vertex>& e,
         const adjacency_list<OutEdgeListS, VertexListS, DirectedS,
              VertexProperty, EdgeProperty, GraphProperty, EdgeListS>&)
  {
    return e.m_target;
  }

// Mutability Traits
template <ADJLIST_PARAMS>
struct graph_mutability_traits<ADJLIST> {
    typedef mutable_property_graph_tag category;
};

// Can't remove vertices from adjacency lists with VL==vecS
template <typename OEL, typename D, typename VP, typename EP, typename GP, typename EL>
struct graph_mutability_traits< adjacency_list<OEL,vecS,D,VP,EP,GP,EL> > {
    typedef add_only_property_graph_tag category;
};
#undef ADJLIST_PARAMS
#undef ADJLIST


} // namespace boost


#endif // BOOST_GRAPH_ADJACENCY_LIST_HPP
