/*! \file */
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#include "../conversion/rocsparse_identity.hpp"
#include "csrgemm_device.h"
#include "internal/extra/rocsparse_csrgemm.h"
#include "rocsparse_control.hpp"
#include "rocsparse_csrgemm.hpp"
#include "rocsparse_utility.hpp"

#include "rocsparse_csrgemm_multadd.hpp"
#include "rocsparse_primitives.hpp"

template <typename I, typename J, typename T>
rocsparse_status rocsparse::csrgemm_multadd_buffer_size_core(rocsparse_handle          handle,
                                                             rocsparse_operation       trans_A,
                                                             rocsparse_operation       trans_B,
                                                             J                         m,
                                                             J                         n,
                                                             J                         k,
                                                             const T*                  alpha,
                                                             const rocsparse_mat_descr descr_A,
                                                             I                         nnz_A,
                                                             const I* csr_row_ptr_A,
                                                             const J* csr_col_ind_A,
                                                             const rocsparse_mat_descr descr_B,
                                                             I                         nnz_B,
                                                             const I* csr_row_ptr_B,
                                                             const J* csr_col_ind_B,
                                                             const T* beta,
                                                             const rocsparse_mat_descr descr_D,
                                                             I                         nnz_D,
                                                             const I*           csr_row_ptr_D,
                                                             const J*           csr_col_ind_D,
                                                             rocsparse_mat_info info_C,
                                                             size_t*            buffer_size)
{
    ROCSPARSE_ROUTINE_TRACE;

    // rocprim buffer
    size_t rocprim_size;
    size_t rocprim_max = 0;

    RETURN_IF_ROCSPARSE_ERROR(
        (rocsparse::primitives::find_max_buffer_size<I, I>(handle, m, &rocprim_size)));
    rocprim_max = rocsparse::max(rocprim_max, rocprim_size);

    RETURN_IF_ROCSPARSE_ERROR((rocsparse::primitives::exclusive_scan_buffer_size<I, I>(
        handle, static_cast<I>(0), m + 1, &rocprim_size)));
    rocprim_max = rocsparse::max(rocprim_max, rocprim_size);

    uint32_t startbit = 0;
    uint32_t endbit   = rocsparse::clz(CSRGEMM_MAXGROUPS);

    RETURN_IF_ROCSPARSE_ERROR((rocsparse::primitives::radix_sort_pairs_buffer_size<I, J>(
        handle, m, startbit, endbit, &rocprim_size)));
    rocprim_max = rocsparse::max(rocprim_max, rocprim_size);

    *buffer_size = ((rocprim_max - 1) / 256 + 1) * 256;

    // Group arrays
    *buffer_size += sizeof(J) * 256 * CSRGEMM_MAXGROUPS;
    *buffer_size += sizeof(J) * 256;
    *buffer_size += ((sizeof(J) * m - 1) / 256 + 1) * 256;

    // Permutation arrays
    *buffer_size += ((sizeof(J) * m - 1) / 256 + 1) * 256;
    *buffer_size += ((sizeof(J) * m - 1) / 256 + 1) * 256;
    *buffer_size += ((sizeof(I) * m - 1) / 256 + 1) * 256;

    info_C->csrgemm_info->buffer_size    = buffer_size[0];
    info_C->csrgemm_info->is_initialized = true;
    return rocsparse_status_success;
}

rocsparse_status
    rocsparse::csrgemm_multadd_buffer_size_quickreturn(rocsparse_handle          handle,
                                                       rocsparse_operation       trans_A,
                                                       rocsparse_operation       trans_B,
                                                       int64_t                   m,
                                                       int64_t                   n,
                                                       int64_t                   k,
                                                       const void*               alpha,
                                                       const rocsparse_mat_descr descr_A,
                                                       int64_t                   nnz_A,
                                                       const void*               csr_row_ptr_A,
                                                       const void*               csr_col_ind_A,
                                                       const rocsparse_mat_descr descr_B,
                                                       int64_t                   nnz_B,
                                                       const void*               csr_row_ptr_B,
                                                       const void*               csr_col_ind_B,
                                                       const void*               beta,
                                                       const rocsparse_mat_descr descr_D,
                                                       int64_t                   nnz_D,
                                                       const void*               csr_row_ptr_D,
                                                       const void*               csr_col_ind_D,
                                                       rocsparse_mat_info        info_C,
                                                       size_t*                   buffer_size)
{
    ROCSPARSE_ROUTINE_TRACE;

    if((m == 0 || n == 0) || ((nnz_A == 0 || nnz_B == 0) && (nnz_D == 0)))
    {
        *buffer_size                         = 0;
        info_C->csrgemm_info->buffer_size    = buffer_size[0];
        info_C->csrgemm_info->is_initialized = true;
        return rocsparse_status_success;
    }
    return rocsparse_status_continue;
}

#define INSTANTIATE(I, J, T)                                               \
    template rocsparse_status rocsparse::csrgemm_multadd_buffer_size_core( \
        rocsparse_handle          handle,                                  \
        rocsparse_operation       trans_A,                                 \
        rocsparse_operation       trans_B,                                 \
        J                         m,                                       \
        J                         n,                                       \
        J                         k,                                       \
        const T*                  alpha,                                   \
        const rocsparse_mat_descr descr_A,                                 \
        I                         nnz_A,                                   \
        const I*                  csr_row_ptr_A,                           \
        const J*                  csr_col_ind_A,                           \
        const rocsparse_mat_descr descr_B,                                 \
        I                         nnz_B,                                   \
        const I*                  csr_row_ptr_B,                           \
        const J*                  csr_col_ind_B,                           \
        const T*                  beta,                                    \
        const rocsparse_mat_descr descr_D,                                 \
        I                         nnz_D,                                   \
        const I*                  csr_row_ptr_D,                           \
        const J*                  csr_col_ind_D,                           \
        rocsparse_mat_info        info_C,                                  \
        size_t*                   buffer_size)

INSTANTIATE(int32_t, int32_t, float);
INSTANTIATE(int32_t, int32_t, double);
INSTANTIATE(int32_t, int32_t, rocsparse_float_complex);
INSTANTIATE(int32_t, int32_t, rocsparse_double_complex);

INSTANTIATE(int64_t, int32_t, float);
INSTANTIATE(int64_t, int32_t, double);
INSTANTIATE(int64_t, int32_t, rocsparse_float_complex);
INSTANTIATE(int64_t, int32_t, rocsparse_double_complex);

INSTANTIATE(int32_t, int64_t, float);
INSTANTIATE(int32_t, int64_t, double);
INSTANTIATE(int32_t, int64_t, rocsparse_float_complex);
INSTANTIATE(int32_t, int64_t, rocsparse_double_complex);

INSTANTIATE(int64_t, int64_t, float);
INSTANTIATE(int64_t, int64_t, double);
INSTANTIATE(int64_t, int64_t, rocsparse_float_complex);
INSTANTIATE(int64_t, int64_t, rocsparse_double_complex);

#undef INSTANTIATE
