/*! \file */
/* ************************************************************************
 * Copyright (C) 2023 Advanced Micro Devices, Inc. All rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *
 * ************************************************************************ */

#include "csrgemm_device.h"
#include "definitions.h"
#include "rocsparse_csrgemm_nnz_calc.hpp"
#include "utility.h"

template <typename I>
rocsparse_status rocsparse_csrgemm_scal_nnz_quickreturn(rocsparse_handle          handle,
                                                        int64_t                   m,
                                                        int64_t                   n,
                                                        const rocsparse_mat_descr descr_D,
                                                        int64_t                   nnz_D,
                                                        const void*               csr_row_ptr_D,
                                                        const void*               csr_col_ind_D,
                                                        const rocsparse_mat_descr descr_C,
                                                        I*                        csr_row_ptr_C,
                                                        I*                        nnz_C,
                                                        const rocsparse_mat_info  info_C,
                                                        void*                     temp_buffer)
{

    // Quick return if possible
    if(m == 0 || n == 0)
    {
        if(handle->pointer_mode == rocsparse_pointer_mode_device)
        {
            RETURN_IF_HIP_ERROR(hipMemsetAsync(nnz_C, 0, sizeof(I), handle->stream));
        }
        else
        {
            *nnz_C = 0;
        }

        if(m > 0)
        {
#define CSRGEMM_DIM 1024
            RETURN_IF_HIPLAUNCHKERNELGGL_ERROR((csrgemm_set_base<CSRGEMM_DIM>),
                                               dim3((m + 1) / CSRGEMM_DIM + 1),
                                               dim3(CSRGEMM_DIM),
                                               0,
                                               handle->stream,
                                               m + 1,
                                               csr_row_ptr_C,
                                               descr_C->base);
#undef CSRGEMM_DIM
        }
        return rocsparse_status_success;
    }

    return rocsparse_status_continue;
}

#define INSTANTIATE(I)                                                \
    template rocsparse_status rocsparse_csrgemm_scal_nnz_quickreturn( \
        rocsparse_handle          handle,                             \
        int64_t                   m,                                  \
        int64_t                   n,                                  \
        const rocsparse_mat_descr descr_D,                            \
        int64_t                   nnz_D,                              \
        const void*               csr_row_ptr_D,                      \
        const void*               csr_col_ind_D,                      \
        const rocsparse_mat_descr descr_C,                            \
        I*                        csr_row_ptr_C,                      \
        I*                        nnz_C,                              \
        const rocsparse_mat_info  info_C,                             \
        void*                     temp_buffer)

INSTANTIATE(int32_t);
INSTANTIATE(int64_t);
#undef INSTANTIATE

template <typename I, typename J>
rocsparse_status rocsparse_csrgemm_scal_nnz_core(rocsparse_handle          handle,
                                                 J                         m,
                                                 J                         n,
                                                 const rocsparse_mat_descr descr_D,
                                                 I                         nnz_D,
                                                 const I*                  csr_row_ptr_D,
                                                 const J*                  csr_col_ind_D,
                                                 const rocsparse_mat_descr descr_C,
                                                 I*                        csr_row_ptr_C,
                                                 I*                        nnz_C,
                                                 const rocsparse_mat_info  info_C,
                                                 void*                     temp_buffer)
{
    const bool mul = info_C->csrgemm_info->mul;
    const bool add = info_C->csrgemm_info->add;
    if(mul == false && add == true)
    {
        // Stream
        hipStream_t stream = handle->stream;

        // When scaling a matrix, nnz of C will always be equal to nnz of D
        if(handle->pointer_mode == rocsparse_pointer_mode_device)
        {
            RETURN_IF_HIP_ERROR(
                hipMemcpyAsync(nnz_C, &nnz_D, sizeof(I), hipMemcpyHostToDevice, stream));

            // Wait for host transfer to finish
            RETURN_IF_HIP_ERROR(hipStreamSynchronize(handle->stream));
        }
        else
        {
            *nnz_C = nnz_D;
        }

        // Copy row pointers
#define CSRGEMM_DIM 1024
        RETURN_IF_HIPLAUNCHKERNELGGL_ERROR((csrgemm_copy<CSRGEMM_DIM>),
                                           dim3(m / CSRGEMM_DIM + 1),
                                           dim3(CSRGEMM_DIM),
                                           0,
                                           stream,
                                           m + 1,
                                           csr_row_ptr_D,
                                           csr_row_ptr_C,
                                           descr_D->base,
                                           descr_C->base);
#undef CSRGEMM_DIM
    }
    else
    {
        RETURN_WITH_MESSAGE_IF_ROCSPARSE_ERROR(rocsparse_status_internal_error,
                                               "failed condition (mul == true && add == false)");
    }
    return rocsparse_status_success;
}

#define INSTANTIATE(I, J)                                                                        \
    template rocsparse_status rocsparse_csrgemm_scal_nnz_core(rocsparse_handle          handle,  \
                                                              J                         m,       \
                                                              J                         n,       \
                                                              const rocsparse_mat_descr descr_D, \
                                                              I                         nnz_D,   \
                                                              const I* csr_row_ptr_D,            \
                                                              const J* csr_col_ind_D,            \
                                                              const rocsparse_mat_descr descr_C, \
                                                              I* csr_row_ptr_C,                  \
                                                              I* nnz_C,                          \
                                                              const rocsparse_mat_info info_C,   \
                                                              void*                    temp_buffer)

INSTANTIATE(int32_t, int32_t);
INSTANTIATE(int32_t, int64_t);
INSTANTIATE(int64_t, int32_t);
INSTANTIATE(int64_t, int64_t);
#undef INSTANTIATE
