// ==========================================================================
//                 SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2016, Knut Reinert, FU Berlin
// All rights reserved.
//
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// modification, are permitted provided that the following conditions are met:
//
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// ==========================================================================
// Author: Andreas Gogol-Doering <andreas.doering@mdc-berlin.de>
// ==========================================================================
// Implementation of the Alloc string class.
// ==========================================================================

#ifndef SEQAN_SEQUENCE_STRING_ALLOC_H_
#define SEQAN_SEQUENCE_STRING_ALLOC_H_

namespace seqan {

// ============================================================================
// Forwards
// ============================================================================

// ============================================================================
// Tags, Classes, Enums
// ============================================================================

/*!
 * @class AllocString Alloc String
 * @extends String
 * @brief Expandable string that is stored on the heap.
 * @headerfile <seqan/sequence.h>
 *
 * @signature template <typename TValue, typename TSpec>
 *            class String<TValue, Alloc<TSpec> >;
 *
 * @tparam TValue Element type of the string.
 * @tparam TSpec  Tag for further specializing Alloc String.  Default is <tt>void</tt>.
 */

// TODO(holtgrew): Where is Alloc<> defined? In module base?

template <typename TValue, typename TSpec>
class String<TValue, Alloc<TSpec> >
{
public:
    typename Value<String>::Type * data_begin;
    typename Value<String>::Type * data_end;
    typename Size<String>::Type    data_capacity;

    String()
            : data_begin(0),
              data_end(0),
              data_capacity(0)
    {
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    template <typename TSource,
              typename Dummy = void,
              typename = std::enable_if_t<std::is_convertible<typename Value<TSource>::Type,TValue>::value, Dummy> >
    String(TSource & source)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        if (length(source) > 0u)
            assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    template <typename TSource,
              typename Dummy = void,
              typename = std::enable_if_t<std::is_convertible<typename Value<TSource>::Type, TValue>::value, Dummy> >
    String(TSource const & source)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        if (length(source) > 0u)
            assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    String(String & source)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        reserve(*this, std::min(capacity(source), computeGenerousCapacity(source, length(source))), Exact());
        if (length(source) > 0u)
            assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    String(String const & source)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        reserve(*this, std::min(capacity(source), computeGenerousCapacity(source, length(source))), Exact());
        if (length(source) > 0u)
            assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    String(String & source, Move const &)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        move(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    String(String && source, Move const &)
        : data_begin(0),
          data_end(0),
          data_capacity(0)
    {
        move(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    template <typename TSource,
              typename TSize,
              typename Dummy = void,
              typename = std::enable_if_t<std::is_convertible<typename Value<TSource>::Type, TValue>::value, Dummy> >
    String(TSource & source, TSize limit)
            : data_begin(0),
              data_end(0),
              data_capacity(0)
    {
        if (length(source) > 0u)
            assign(*this, source, limit);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }

    template <typename TSource,
              typename TSize,
              typename Dummy = void,
              typename = std::enable_if_t<std::is_convertible<typename Value<TSource>::Type, TValue>::value, Dummy> >
    String(TSource const & source, TSize limit)
            : data_begin(0),
              data_end(0),
              data_capacity(0)
    {
        if (length(source) > 0u)
            assign(*this, source, limit);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
    }


    template <typename TSource,
              typename Dummy = void,
              typename = std::enable_if_t<std::is_convertible<typename Value<TSource>::Type, TValue>::value, Dummy> >
    inline
    String & operator=(TSource const & source)
    {
        assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
        return *this;
    }

    inline
    String & operator=(String const & source)
    {
        assign(*this, source);
        SEQAN_ASSERT_LEQ_MSG(data_begin, data_end, "String end is before begin!");
        return *this;
    }

    ~String()
    {
        arrayDestruct(this->data_begin, this->data_end);
        _deallocateStorage(*this, this->data_begin, data_capacity);
    }

    // ----------------------------------------------------------------------
    // Subscription operators; have to be defined in class def.
    // ----------------------------------------------------------------------

    template <typename TPos>
    inline typename Reference<String>::Type
    operator[] (TPos pos)
    {
        return value(*this, pos);
    }

    template <typename TPos>
    inline typename Reference<String const>::Type
    operator[] (TPos pos) const
    {
        return value(*this, pos);
    }
};

// ============================================================================
// Metafunctions
// ============================================================================

// ----------------------------------------------------------------------------
// Metafunction DefaultOverflowImplicit
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
struct DefaultOverflowImplicit<String<TValue, Alloc<TSpec> > >
{
    typedef Generous Type;
};

template <typename TValue, typename TSpec>
struct DefaultOverflowImplicit<String<TValue, Alloc<TSpec> > const>
{
    typedef Generous Type;
};

// ----------------------------------------------------------------------------
// Metafunction IsContiguous
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
struct IsContiguous<String<TValue, Alloc<TSpec> > > :
    True {};

// ----------------------------------------------------------------------------
// Metafunction HasMoveConstructor
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
struct HasMoveConstructor<String<TValue, Alloc<TSpec> > > :
    True {};

// ============================================================================
// Functions
// ============================================================================

// ----------------------------------------------------------------------------
// Function std::swap()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
inline void
swap(String<TValue, Alloc<TSpec> > & a,
     String<TValue, Alloc<TSpec> > & b)
{
    std::swap(a.data_begin, b.data_begin);
    std::swap(a.data_end, b.data_end);
    std::swap(a.data_capacity, b.data_capacity);
}

// ----------------------------------------------------------------------------
// Function begin()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
inline typename Iterator<String<TValue, Alloc<TSpec> >, Standard>::Type
begin(String<TValue, Alloc<TSpec> > & me,
      Standard)
{
    return me.data_begin;
}
template <typename TValue, typename TSpec>
inline typename Iterator<String<TValue, Alloc<TSpec> > const, Standard>::Type
begin(String<TValue, Alloc<TSpec> > const & me,
      Standard)
{
    return me.data_begin;
}

// ----------------------------------------------------------------------------
// Function end()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
inline typename Iterator<String<TValue, Alloc<TSpec> >, Standard>::Type
end(String<TValue, Alloc<TSpec> > & me,
    Standard const &)
{
    return me.data_end;
}
template <typename TValue, typename TSpec>
inline typename Iterator<String<TValue, Alloc<TSpec> > const, Standard>::Type
end(String<TValue, Alloc<TSpec> > const & me,
    Standard const & )
{
    return me.data_end;
}

// ----------------------------------------------------------------------------
// Function capacity()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec>
inline typename Size<String<TValue, Alloc<TSpec> > >::Type
capacity(String<TValue, Alloc<TSpec> > const & me)
{
    return me.data_capacity;
}

// ----------------------------------------------------------------------------
// Internal Function _setBegin()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec, typename TPtr>
inline void
_setBegin(String<TValue, Alloc<TSpec> > & me,
          TPtr * new_begin)
{
    me.data_begin = new_begin;
}

// ----------------------------------------------------------------------------
// Internal Function _setLength()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec, typename TSize>
inline void
_setLength(String<TValue, Alloc<TSpec> > & me,
           TSize new_length)
{
    me.data_end = me.data_begin + new_length;
}

// ----------------------------------------------------------------------------
// Internal Function _setCapacity()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec, typename TSize>
inline void
_setCapacity(String<TValue, Alloc<TSpec> > & me,
             TSize new_capacity)
{
    me.data_capacity = new_capacity;
}

// ----------------------------------------------------------------------------
// Internal Function _allocateStorage()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec, typename TSize>
inline typename Value<String<TValue, Alloc<TSpec> > >::Type *
_allocateStorage(String<TValue, Alloc<TSpec> > & me,
                 TSize new_capacity)
{
    typedef typename If<IsSameType<TSpec, OverAligned>, TagAllocateAlignedMalloc, TagAllocateStorage>::Type AllocTag;

    typename Size<String<TValue, Alloc<TSpec> > >::Type size = _computeSizeForCapacity(me, new_capacity);
    typename Value<String<TValue, Alloc<TSpec> > >::Type * _returnValue = me.data_begin;
    allocate(me, me.data_begin, size, AllocTag());
    me.data_capacity = new_capacity;
    return _returnValue;
}

// ----------------------------------------------------------------------------
// Internal Function _deallocateStorage()
// ----------------------------------------------------------------------------

template <typename TValue, typename TSpec, typename TPtr, typename TSize>
inline void
_deallocateStorage(String<TValue, Alloc<TSpec> > & me,
                   TPtr * ptr,
                   TSize capacity)
{
    typedef typename If<IsSameType<TSpec, OverAligned>, TagAllocateAlignedMalloc, TagAllocateStorage>::Type AllocTag;

    typename Size<String<TValue, Alloc<TSpec> > >::Type size = _computeSizeForCapacity(me, capacity);
    deallocate(me, ptr, size, AllocTag());
}

// ----------------------------------------------------------------------------
// Function move()
// ----------------------------------------------------------------------------

// TODO(holtgrew): This moves the contents of the string not the data itself! Semantic is different in string_cstyle and intuition.

/* Entwicklungsschrott?
inline void
move(String & target,
     String & source)
{
    clear(target);
    target.data_begin = source.data_begin;
    target.data_end = source.data_end;
    target.data_capacity = source.data_capacity;

    source.data_begin = 0;
    source.data_end = 0;
    source.data_capacity = 0;
}
*/

template <typename TTargetValue, typename TSourceValue, typename TSpec>
inline void
move(String<TTargetValue, Alloc<TSpec> > & target,
     String<TSourceValue, Alloc<TSpec> > & source)
{
    _moveContiguous(target, source);
}

template <typename TTargetValue, typename TSourceValue, typename TSpec>
inline void
move(String<TTargetValue, Alloc<TSpec> > & target,
     String<TSourceValue, Alloc<TSpec> > const & source)
{
    _moveContiguous(target, source);
}

template <typename TValue, typename TSpec>
inline void
move(String<TValue, Alloc<TSpec> > & target,
     String<TValue, Alloc<TSpec> > & source)
{
    arrayDestruct(target.data_begin, target.data_end);
    _deallocateStorage(target, target.data_begin, target.data_capacity);
//    clear(target);
    target.data_begin = source.data_begin;
    target.data_end = source.data_end;
    target.data_capacity = source.data_capacity;

    source.data_begin = 0;
    source.data_end = 0;
    source.data_capacity = 0;
}

template <typename TValue, typename TSpec>
inline void
move(String<TValue, Alloc<TSpec> > & target,
     String<TValue, Alloc<TSpec> > const & source)
{
    move(target, const_cast<String<TValue, Alloc<TSpec> > &>(source));
}

}  // namespace seqan

#endif  // #ifndef SEQAN_SEQUENCE_STRING_ALLOC_H_
