// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
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#ifndef SEQAN_HEADER_GRAPH_ITERATOR_ADJACENCY_H
#define SEQAN_HEADER_GRAPH_ITERATOR_ADJACENCY_H

namespace seqan2
{
//////////////////////////////////////////////////////////////////////////////
// Graph AdjacencyIterator
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

/*!
 * @class AdjacencyIterator
 * @extends Iter
 * @headerfile <seqan/graph_types.h>
 * @brief Adjacent edge iterator for a @link Graph @endlink.
 *
 * @signature AdjacencyIterator<TGraph, AdjacencyIterator>::Type;
 * @signature template <typename TGraph, typename TSpec>
 *            class Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> >;
 *
 * @tparam TGraph The graph to iterate the vertices of.
 *
 * The first signature is the signature of the corresponding @link ContainerConcept#Iterator graph's Iterator @endlink
 * metafunction call.  The second call is the internal definition of the type.  You should always get this type using
 * the metafunction call from the first signature.
 *
 *
 * @fn AdjacencyIterator::AdjacencyIterator
 * @brief Constructor
 *
 * @signature Iter::Iter();
 * @signature Iter::Iter(iter);
 * @signature Iter::Iter(graph, v);
 *
 * @param[in] iter  Other AdjacencyIterator to copy from.
 * @param[in] graph The @link Graph @endlink to iterate vertices for.
 * @param[in] v     The descriptor of the vertex to iterate adjacent edges of.
 */

template<typename TGraph, typename TSpec>
class Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >
{
public:
    typedef typename VertexDescriptor<TGraph>::Type TVertexDescriptor_;
    typedef typename Iterator<TGraph, OutEdgeIterator>::Type TOutEdgeIterator_;
    TOutEdgeIterator_ data_edge_it;

    Iter()
    {
    }

    Iter(TGraph const& _graph, TVertexDescriptor_ const v) :
        data_edge_it(_graph, v)
    {
    }

    ~Iter() {
    }

    Iter(Iter const& _iter) : data_edge_it(_iter.data_edge_it)
    {
    }

    Iter const&    operator = (Iter const & _other) {
        if (this == &_other) return *this;
        data_edge_it = _other.data_edge_it;
        return *this;
    }
//____________________________________________________________________________
};


//////////////////////////////////////////////////////////////////////////////
// Graph InternalAdjacencyIterator - Metafunctions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph>
struct Iterator<TGraph, AdjacencyIterator>
{
    typedef Iter<TGraph, GraphIterator<InternalAdjacencyIterator<AdjacencyIterator> > > Type;
};

template<typename TGraph>
struct Iterator<TGraph const, AdjacencyIterator>
{
    typedef Iter<TGraph const, GraphIterator<InternalAdjacencyIterator<AdjacencyIterator> > > Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Value<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Value<Iter<TGraph const, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename Value<Iter<TGraph const, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Reference<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename Reference<Iter<TGraph, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Reference<Iter<TGraph const, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename Reference<Iter<TGraph const, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct GetValue<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename GetValue<Iter<TGraph, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

template<typename TGraph, typename TIteratorSpec>
struct GetValue<Iter<TGraph const, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef typename GetValue<Iter<TGraph const, GraphIterator<InternalVertexIterator<TIteratorSpec> > > >::Type Type;
};

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TIteratorSpec>
struct Spec<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef TIteratorSpec Type;
};

template<typename TGraph, typename TIteratorSpec>
struct Spec<Iter<TGraph const, GraphIterator<InternalAdjacencyIterator<TIteratorSpec> > > >
{
    typedef TIteratorSpec Type;
};

//////////////////////////////////////////////////////////////////////////////
// Graph InternalAdjacencyIterator - Functions
//////////////////////////////////////////////////////////////////////////////

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename GetValue<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > >::Type
getValue(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return targetVertex(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename GetValue<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > >::Type
value(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return getValue(it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename GetValue<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > >::Type
operator * (Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return value(it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline typename Host<Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > >::Type const&
hostGraph(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return hostGraph(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline bool
atBegin(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return atBegin(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline void
goBegin(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goBegin(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline bool
atEnd(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    return (atEnd(it.data_edge_it));
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline void
goEnd(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goEnd(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline void
goNext(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goNext(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >&
operator ++(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goNext(it);
    return it;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >
operator ++(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it, int)
{
    Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > ret = it;
    goNext(it);
    return ret;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline void
goPrevious(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goPrevious(it.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >&
operator --(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it)
{
    goPrevious(it);
    return it;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >
operator --(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it, int)
{
    Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > > ret = it;
    goPrevious(it);
    return ret;
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline bool
operator ==(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it1,
            Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it2)
{
    return (it1.data_edge_it==it2.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

template<typename TGraph, typename TSpec>
inline bool
operator !=(Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it1,
            Iter<TGraph, GraphIterator<InternalAdjacencyIterator<TSpec> > >& it2)
{
    return (it1.data_edge_it!=it2.data_edge_it);
}

//////////////////////////////////////////////////////////////////////////////

}// namespace seqan2

#endif //#ifndef SEQAN_HEADER_...
