// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2024, Knut Reinert, FU Berlin
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in the
//       documentation and/or other materials provided with the distribution.
//     * Neither the name of Knut Reinert or the FU Berlin nor the names of
//       its contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// DAMAGE.
//
// ==========================================================================
// Author: David Weese <david.weese@fu-berlin.de>
// ==========================================================================

#ifndef SEQAN_HEADER_PIPE_NAMER_H
#define SEQAN_HEADER_PIPE_NAMER_H

namespace seqan2
{

//namespace seqan2_NAMESPACE_PIPELINING
//{

    template < typename TCompare >
    struct Namer;

    template < typename TInput, typename TCompare >
    struct Value< Pipe< TInput, Namer<TCompare> > >
    {
        typedef Pair<
            typename Value<typename Value<TInput>::Type, 1>::Type,
            typename Size<TInput>::Type,
            Pack
        > Type;
    };

/*!
 * @class Namer
 * @extends Pipe
 * @headerfile <seqan/pipe.h>
 *
 * @brief Extends the input stream by a second field which names the elements.
 *
 * @signature template <typename TInput, typename TCompare>
 *            class Pipe<TInput, Namer<TCompare> >;
 *
 * @tparam TInput   The type of the pipeline module this module reads from.
 * @tparam TCompare A function (see STL's <tt>function</tt>) with result type <tt>int</tt>.  Should
 *                  return <tt>0</tt> if and only if two elements are equal.
 *
 * The output type is a Pair of input type and size type (i.e. <tt>Pair&lt;Value&lt;TInput&gt;::Type, Size&lt;TInput&gt;::Type&gt;</tt>).
 *
 * The first output field is the original input stream.
 *
 * The second output field is the name. This field begins with 0 and increases by 1 for every distinct element. Two
 * elements gets the same name, if and only if they are equal.
 */

    //////////////////////////////////////////////////////////////////////////////
    // namer class
    template < typename TInput, typename TCompare >
    struct Pipe< TInput, Namer<TCompare> >
    {
        TInput                          &in;
        TCompare                        C;
        typename Value<Pipe>::Type      tmp;
        typename Value<TInput>::Type    last;

/*!
 * @fn Namer::Pipe
 * @brief Constructor
 *
 * @signature Pipe::Pipe(in[, comp]);
 *
 * @param[in] in   Reference to an input pipe.
 * @param[in] comp A <tt>TCompare</tt> object (copied).
 */

        Pipe(TInput& _in):
            in(_in) {}

        Pipe(TInput& _in, const TCompare& tmpC) :
            in(_in),
            C(tmpC) {}

        inline typename Value<Pipe>::Type const & operator*()
        {
            tmp.i1 = getValueI1(*in);
            return tmp;
        }

        inline Pipe& operator++()
        {
            ++in;
            if (!eof(in) && C(last, *in) != 0) {
                SEQAN_ASSERT_LT(C(last, *in), 0);
                last = *in;
                ++tmp.i2;
            }
            return *this;
        }

        bool unique() const
        {
            return tmp.i2 == (length(in) - 1);
        }
    };


    //////////////////////////////////////////////////////////////////////////////
    // global pipe functions
    template < typename TInput, typename TCompare >
    inline bool control(Pipe< TInput, Namer<TCompare> > &me, ControlBeginRead const &command)
    {
        if (!control(me.in, command)) return false;
        if (!eof(me.in))
        {
            me.last = *me.in;
            me.tmp.i1 = me.last.i1;
        }
        me.tmp.i2 = 0;
        return true;
    }

//}

}

#endif
