/*******************************************************
 * Copyright (c) 2014, ArrayFire
 * All rights reserved.
 *
 * This file is distributed under 3-clause BSD license.
 * The complete license agreement can be obtained at:
 * http://arrayfire.com/licenses/BSD-3-Clause
 ********************************************************/

#include <Array.hpp>
#include <unwrap.hpp>
#include <common/dispatch.hpp>
#include <math.hpp>
#include <platform.hpp>
#include <kernel/unwrap.hpp>

namespace cpu
{

template<typename T>
Array<T> unwrap(const Array<T> &in, const dim_t wx, const dim_t wy,
                const dim_t sx, const dim_t sy, const dim_t px, const dim_t py, const bool is_column)
{
    in.eval();

    af::dim4 idims = in.dims();
    dim_t nx = (idims[0] + 2 * px - wx) / sx + 1;
    dim_t ny = (idims[1] + 2 * py - wy) / sy + 1;

    af::dim4 odims(wx * wy, nx * ny, idims[2], idims[3]);

    if (!is_column) {
        std::swap(odims[0], odims[1]);
    }

    Array<T> outArray = createEmptyArray<T>(odims);

    if (is_column) {
        getQueue().enqueue(kernel::unwrap_dim<T, 1>, outArray, in, wx, wy, sx, sy, px, py);
    } else {
        getQueue().enqueue(kernel::unwrap_dim<T, 0>, outArray, in, wx, wy, sx, sy, px, py);
    }

    return outArray;
}


#define INSTANTIATE(T)                                                                  \
    template Array<T> unwrap<T> (const Array<T> &in, const dim_t wx, const dim_t wy,    \
                    const dim_t sx, const dim_t sy, const dim_t px, const dim_t py, const bool is_column);


INSTANTIATE(float)
INSTANTIATE(double)
INSTANTIATE(cfloat)
INSTANTIATE(cdouble)
INSTANTIATE(int)
INSTANTIATE(uint)
INSTANTIATE(intl)
INSTANTIATE(uintl)
INSTANTIATE(uchar)
INSTANTIATE(char)
INSTANTIATE(short)
INSTANTIATE(ushort)

}
