/* ************************************************************************
 * Copyright 2016-2021 Advanced Micro Devices, Inc.
 * ************************************************************************ */
#include "rocblas_scal.hpp"
#include "check_numerics_vector.hpp"
#include "handle.hpp"
#include "logging.hpp"
#include "rocblas.h"
#include "utility.hpp"

namespace
{
    template <typename T, typename = T>
    constexpr char rocblas_scal_name[] = "unknown";
    template <>
    constexpr char rocblas_scal_name<float>[] = "rocblas_sscal";
    template <>
    constexpr char rocblas_scal_name<double>[] = "rocblas_dscal";
    template <>
    constexpr char rocblas_scal_name<rocblas_float_complex>[] = "rocblas_cscal";
    template <>
    constexpr char rocblas_scal_name<rocblas_double_complex>[] = "rocblas_zscal";
    template <>
    constexpr char rocblas_scal_name<rocblas_float_complex, float>[] = "rocblas_csscal";
    template <>
    constexpr char rocblas_scal_name<rocblas_double_complex, double>[] = "rocblas_zdscal";

    template <rocblas_int NB, typename T, typename U>
    rocblas_status rocblas_scal_impl(
        rocblas_handle handle, rocblas_int n, const U* alpha, T* x, rocblas_int incx)
    {
        if(!handle)
            return rocblas_status_invalid_handle;

        auto layer_mode     = handle->layer_mode;
        auto check_numerics = handle->check_numerics;

        if(layer_mode & rocblas_layer_mode_log_trace)
            log_trace(
                handle, rocblas_scal_name<T, U>, n, LOG_TRACE_SCALAR_VALUE(handle, alpha), x, incx);

        // there are an extra 2 scal functions, thus
        // the -r mode will not work correctly. Substitute
        // with --a_type and --b_type (?)
        // ANSWER: -r is syntatic sugar; the types can be specified separately
        if(layer_mode & rocblas_layer_mode_log_bench)
        {
            log_bench(handle,
                      "./rocblas-bench -f scal --a_type",
                      rocblas_precision_string<T>,
                      "--b_type",
                      rocblas_precision_string<U>,
                      "-n",
                      n,
                      LOG_BENCH_SCALAR_VALUE(handle, alpha),
                      "--incx",
                      incx);
        }

        if(layer_mode & rocblas_layer_mode_log_profile)
            log_profile(handle, rocblas_scal_name<T, U>, "N", n, "incx", incx);

        if(n <= 0 || incx <= 0)
            return rocblas_status_success;
        if(!x || !alpha)
            return rocblas_status_invalid_pointer;

        RETURN_ZERO_DEVICE_MEMORY_SIZE_IF_QUERIED(handle);

        if(check_numerics)
        {
            bool           is_input              = true;
            rocblas_status check_numerics_status = rocblas_internal_check_numerics_vector_template(
                rocblas_scal_name<T>, handle, n, x, 0, incx, 0, 1, check_numerics, is_input);
            if(check_numerics_status != rocblas_status_success)
                return check_numerics_status;
        }

        rocblas_status status
            = rocblas_internal_scal_template<NB, T>(handle, n, alpha, 0, x, 0, incx, 0, 1);
        if(status != rocblas_status_success)
            return status;

        if(check_numerics)
        {
            bool           is_input              = false;
            rocblas_status check_numerics_status = rocblas_internal_check_numerics_vector_template(
                rocblas_scal_name<T>, handle, n, x, 0, incx, 0, 1, check_numerics, is_input);
            if(check_numerics_status != rocblas_status_success)
                return check_numerics_status;
        }

        return status;
    }
}

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

extern "C" {

rocblas_status rocblas_sscal(
    rocblas_handle handle, rocblas_int n, const float* alpha, float* x, rocblas_int incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

rocblas_status rocblas_dscal(
    rocblas_handle handle, rocblas_int n, const double* alpha, double* x, rocblas_int incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

rocblas_status rocblas_cscal(rocblas_handle               handle,
                             rocblas_int                  n,
                             const rocblas_float_complex* alpha,
                             rocblas_float_complex*       x,
                             rocblas_int                  incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

rocblas_status rocblas_zscal(rocblas_handle                handle,
                             rocblas_int                   n,
                             const rocblas_double_complex* alpha,
                             rocblas_double_complex*       x,
                             rocblas_int                   incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

// Scal with a real alpha & complex vector
rocblas_status rocblas_csscal(rocblas_handle         handle,
                              rocblas_int            n,
                              const float*           alpha,
                              rocblas_float_complex* x,
                              rocblas_int            incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

rocblas_status rocblas_zdscal(rocblas_handle          handle,
                              rocblas_int             n,
                              const double*           alpha,
                              rocblas_double_complex* x,
                              rocblas_int             incx)
try
{
    constexpr rocblas_int NB = 256;
    return rocblas_scal_impl<NB>(handle, n, alpha, x, incx);
}
catch(...)
{
    return exception_to_rocblas_status();
}

} // extern "C"