/* ************************************************************************
 * Copyright 2016 Advanced Micro Devices, Inc.
 *
 * ************************************************************************ */

#include <stdio.h>
#include <stdlib.h>
#include <vector>

#include "cblas_interface.h"
#include "hipblas.hpp"
#include "norm.h"
#include "unit.h"
#include "utility.h"
#include <complex.h>

using namespace std;

/* ============================================================================================ */

// Tolerance of 100 fails for complex,
// TODO: something better than arbitrary tolerance.
template <typename T>
constexpr double nrm2_strided_batched_tolerance_multiplier = 100;
template <>
constexpr double nrm2_strided_batched_tolerance_multiplier<hipComplex> = 110;
template <>
constexpr double nrm2_strided_batched_tolerance_multiplier<hipDoubleComplex> = 110;

template <typename T1, typename T2>
hipblasStatus_t testing_nrm2_strided_batched(Arguments argus)
{
    int    N            = argus.N;
    int    incx         = argus.incx;
    double stride_scale = argus.stride_scale;
    int    batch_count  = argus.batch_count;

    int stridex = N * incx * stride_scale;
    int sizeX   = stridex * batch_count;

    hipblasStatus_t status_1 = HIPBLAS_STATUS_SUCCESS;
    hipblasStatus_t status_2 = HIPBLAS_STATUS_SUCCESS;
    hipblasStatus_t status_3 = HIPBLAS_STATUS_SUCCESS;
    hipblasStatus_t status_4 = HIPBLAS_STATUS_SUCCESS;

    // check to prevent undefined memory allocation error
    if(N < 0 || incx < 0 || batch_count < 0)
    {
        return HIPBLAS_STATUS_INVALID_VALUE;
    }
    if(batch_count == 0)
    {
        return HIPBLAS_STATUS_SUCCESS;
    }

    // Naming: dX is in GPU (device) memory. hK is in CPU (host) memory, plz follow this practice
    host_vector<T1> hx(sizeX);
    host_vector<T2> h_rocblas_result_1(batch_count);
    host_vector<T2> h_rocblas_result_2(batch_count);
    host_vector<T2> h_cpu_result(batch_count);

    device_vector<T1> dx(sizeX);
    device_vector<T2> d_rocblas_result(batch_count);

    double gpu_time_used, cpu_time_used;
    double rocblas_error;

    hipblasHandle_t handle;
    hipblasCreate(&handle);

    // Initial Data on CPU
    srand(1);
    hipblas_init<T1>(hx, 1, N, incx, stridex, batch_count);

    // copy data from CPU to device, does not work for incx != 1
    CHECK_HIP_ERROR(hipMemcpy(dx, hx.data(), sizeof(T1) * sizeX, hipMemcpyHostToDevice));

    // hipblasNrm2 accept both dev/host pointer for the scalar

    status_1 = hipblasSetPointerMode(handle, HIPBLAS_POINTER_MODE_DEVICE);
    status_2 = hipblasNrm2StridedBatched<T1, T2>(
        handle, N, dx, incx, stridex, batch_count, d_rocblas_result);

    status_3 = hipblasSetPointerMode(handle, HIPBLAS_POINTER_MODE_HOST);
    status_4 = hipblasNrm2StridedBatched<T1, T2>(
        handle, N, dx, incx, stridex, batch_count, h_rocblas_result_1);

    if((status_1 != HIPBLAS_STATUS_SUCCESS) || (status_2 != HIPBLAS_STATUS_SUCCESS)
       || (status_3 != HIPBLAS_STATUS_SUCCESS) || (status_4 != HIPBLAS_STATUS_SUCCESS))
    {
        hipblasDestroy(handle);
        if(status_1 != HIPBLAS_STATUS_SUCCESS)
            return status_1;
        if(status_2 != HIPBLAS_STATUS_SUCCESS)
            return status_2;
        if(status_3 != HIPBLAS_STATUS_SUCCESS)
            return status_3;
        if(status_4 != HIPBLAS_STATUS_SUCCESS)
            return status_4;
    }

    CHECK_HIP_ERROR(hipMemcpy(
        h_rocblas_result_2, d_rocblas_result, sizeof(T2) * batch_count, hipMemcpyDeviceToHost));

    if(argus.unit_check || argus.norm_check)
    {
        /* =====================================================================
                    CPU BLAS
        =================================================================== */
        for(int b = 0; b < batch_count; b++)
        {
            cblas_nrm2<T1, T2>(N, hx.data() + b * stridex, incx, &(h_cpu_result[b]));
        }

        if(argus.unit_check)
        {
            T2 tolerance = nrm2_tolerance_multiplier<T1>;
            for(int b = 0; b < batch_count; b++)
            {
                unit_check_nrm2<T2>(h_cpu_result[b], h_rocblas_result_1[b], tolerance);
                unit_check_nrm2<T2>(h_cpu_result[b], h_rocblas_result_2[b], tolerance);
            }
        }

    } // end of if unit/norm check

    //  BLAS_1_RESULT_PRINT

    hipblasDestroy(handle);
    return HIPBLAS_STATUS_SUCCESS;
}