/* ************************************************************************
 * Copyright 2016-2021 Advanced Micro Devices, Inc.
 * ************************************************************************ */
#include "rocblas_dot_ex.hpp"
#include "logging.hpp"

namespace
{
    // HIP support up to 1024 threads/work itemes per thread block/work group
    // setting to 512 for gfx803.
    constexpr int NB = 512;

    template <bool CONJ>
    rocblas_status rocblas_dot_ex_impl(rocblas_handle   handle,
                                       rocblas_int      n,
                                       const void*      x,
                                       rocblas_datatype x_type,
                                       rocblas_int      incx,
                                       const void*      y,
                                       rocblas_datatype y_type,
                                       rocblas_int      incy,
                                       void*            result,
                                       rocblas_datatype result_type,
                                       rocblas_datatype execution_type,
                                       const char*      name,
                                       const char*      bench_name)
    {
        if(!handle)
        {
            return rocblas_status_invalid_handle;
        }

        size_t dev_bytes = rocblas_reduction_kernel_workspace_size<NB>(n, 1, execution_type);
        if(handle->is_device_memory_size_query())
        {
            if(n <= 0)
                return rocblas_status_size_unchanged;
            else
                return handle->set_optimal_device_memory_size(dev_bytes);
        }

        auto layer_mode = handle->layer_mode;
        if(layer_mode
           & (rocblas_layer_mode_log_trace | rocblas_layer_mode_log_bench
              | rocblas_layer_mode_log_profile))
        {
            auto x_type_str      = rocblas_datatype_string(x_type);
            auto y_type_str      = rocblas_datatype_string(y_type);
            auto result_type_str = rocblas_datatype_string(result_type);
            auto ex_type_str     = rocblas_datatype_string(execution_type);

            if(layer_mode & rocblas_layer_mode_log_trace)
            {
                log_trace(handle,
                          name,
                          n,
                          x,
                          x_type_str,
                          incx,
                          y,
                          y_type_str,
                          incy,
                          result_type_str,
                          ex_type_str);
            }

            if(layer_mode & rocblas_layer_mode_log_bench)
            {
                log_bench(handle,
                          "./rocblas-bench",
                          "-f",
                          bench_name,
                          "-n",
                          n,
                          "--a_type",
                          x_type_str,
                          "--incx",
                          incx,
                          "--b_type",
                          y_type_str,
                          "--incy",
                          incy,
                          "--c_type",
                          result_type_str,
                          "--compute_type",
                          ex_type_str);
            }

            if(layer_mode & rocblas_layer_mode_log_profile)
            {
                log_profile(handle,
                            name,
                            "N",
                            n,
                            "a_type",
                            x_type_str,
                            "incx",
                            incx,
                            "b_type",
                            y_type_str,
                            "incy",
                            incy,
                            "c_type",
                            result_type_str,
                            "compute_type",
                            ex_type_str);
            }
        }

        if(n <= 0)
        {
            if(!result)
                return rocblas_status_invalid_pointer;
            if(rocblas_pointer_mode_device == handle->pointer_mode)
                RETURN_IF_HIP_ERROR(hipMemsetAsync(
                    result, 0, rocblas_sizeof_datatype(result_type), handle->get_stream()));
            else
                memset(result, 0, rocblas_sizeof_datatype(result_type));
            return rocblas_status_success;
        }

        if(!x || !y || !result)
            return rocblas_status_invalid_pointer;

        auto w_mem = handle->device_malloc(dev_bytes);
        if(!w_mem)
            return rocblas_status_memory_error;

        static constexpr rocblas_int    batch_count_1 = 1;
        static constexpr rocblas_stride stride_0      = 0;
        return rocblas_dot_ex_template<NB, false, CONJ>(handle,
                                                        n,
                                                        x,
                                                        x_type,
                                                        incx,
                                                        stride_0,
                                                        y,
                                                        y_type,
                                                        incy,
                                                        stride_0,
                                                        batch_count_1,
                                                        result,
                                                        result_type,
                                                        execution_type,
                                                        (void*)w_mem);
    }

}

/*
 * ===========================================================================
 *    C wrapper
 * ===========================================================================
 */

extern "C" {

rocblas_status rocblas_dot_ex(rocblas_handle   handle,
                              rocblas_int      n,
                              const void*      x,
                              rocblas_datatype x_type,
                              rocblas_int      incx,
                              const void*      y,
                              rocblas_datatype y_type,
                              rocblas_int      incy,
                              void*            result,
                              rocblas_datatype result_type,
                              rocblas_datatype execution_type)
{
    try
    {
        return rocblas_dot_ex_impl<false>(handle,
                                          n,
                                          x,
                                          x_type,
                                          incx,
                                          y,
                                          y_type,
                                          incy,
                                          result,
                                          result_type,
                                          execution_type,
                                          "rocblas_dot_ex",
                                          "dot_ex");
    }
    catch(...)
    {
        return exception_to_rocblas_status();
    }
}

rocblas_status rocblas_dotc_ex(rocblas_handle   handle,
                               rocblas_int      n,
                               const void*      x,
                               rocblas_datatype x_type,
                               rocblas_int      incx,
                               const void*      y,
                               rocblas_datatype y_type,
                               rocblas_int      incy,
                               void*            result,
                               rocblas_datatype result_type,
                               rocblas_datatype execution_type)
{
    try
    {
        return rocblas_dot_ex_impl<true>(handle,
                                         n,
                                         x,
                                         x_type,
                                         incx,
                                         y,
                                         y_type,
                                         incy,
                                         result,
                                         result_type,
                                         execution_type,
                                         "rocblas_dotc_ex",
                                         "dotc_ex");
    }
    catch(...)
    {
        return exception_to_rocblas_status();
    }
}

} // extern "C"