/* ************************************************************************
 * Copyright 2018-2022 Advanced Micro Devices, Inc.
 * ************************************************************************ */

#pragma once

#include "cblas_interface.hpp"
#include "norm.hpp"
#include "rocblas.hpp"
#include "rocblas_iamax_iamin_ref.hpp"
#include "rocblas_init.hpp"
#include "rocblas_math.hpp"
#include "rocblas_random.hpp"
#include "rocblas_test.hpp"
#include "rocblas_vector.hpp"
#include "unit.hpp"
#include "utility.hpp"

template <typename T>
void testing_iamax_iamin_bad_arg(const Arguments& arg, rocblas_iamax_iamin_t<T> func)
{
    rocblas_int         N         = 100;
    rocblas_int         incx      = 1;
    static const size_t safe_size = 100;

    rocblas_local_handle handle{arg};
    device_vector<T>     dx(safe_size);
    CHECK_DEVICE_ALLOCATION(dx.memcheck());

    rocblas_int h_rocblas_result;

    EXPECT_ROCBLAS_STATUS(func(handle, N, nullptr, incx, &h_rocblas_result),
                          rocblas_status_invalid_pointer);
    EXPECT_ROCBLAS_STATUS(func(handle, N, dx, incx, nullptr), rocblas_status_invalid_pointer);
    EXPECT_ROCBLAS_STATUS(func(nullptr, N, dx, incx, &h_rocblas_result),
                          rocblas_status_invalid_handle);
}

template <typename T>
void testing_iamax_bad_arg(const Arguments& arg)
{
    const bool FORTRAN          = arg.fortran;
    auto       rocblas_iamax_fn = FORTRAN ? rocblas_iamax<T, true> : rocblas_iamax<T, false>;
    testing_iamax_iamin_bad_arg<T>(arg, rocblas_iamax_fn);
}

template <typename T>
void testing_iamin_bad_arg(const Arguments& arg)
{
    const bool FORTRAN          = arg.fortran;
    auto       rocblas_iamin_fn = FORTRAN ? rocblas_iamin<T, true> : rocblas_iamin<T, false>;
    testing_iamax_iamin_bad_arg<T>(arg, rocblas_iamin_fn);
}

template <typename T, void REFBLAS_FUNC(rocblas_int, const T*, rocblas_int, rocblas_int*)>
void testing_iamax_iamin(const Arguments& arg, rocblas_iamax_iamin_t<T> func)
{
    rocblas_int N    = arg.N;
    rocblas_int incx = arg.incx;

    rocblas_int h_rocblas_result_1;
    rocblas_int h_rocblas_result_2;

    rocblas_int rocblas_error_1;
    rocblas_int rocblas_error_2;

    rocblas_local_handle handle{arg};

    // check to prevent undefined memory allocation error
    if(N <= 0 || incx <= 0)
    {
        using R = rocblas_int;
        device_vector<R> d_rocblas_result(1);
        CHECK_DEVICE_ALLOCATION(d_rocblas_result.memcheck());

        host_vector<R> h_rocblas_result(1);
        CHECK_HIP_ERROR(h_rocblas_result.memcheck());

        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_device));
        CHECK_ROCBLAS_ERROR(func(handle, N, nullptr, incx, d_rocblas_result));

        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_host));
        CHECK_ROCBLAS_ERROR(func(handle, N, nullptr, incx, h_rocblas_result));

        R cpu_0 = R(0);
        R gpu_0, gpu_1;
        CHECK_HIP_ERROR(hipMemcpy(&gpu_0, d_rocblas_result, sizeof(T), hipMemcpyDeviceToHost));
        gpu_1 = h_rocblas_result[0];
        unit_check_general<R>(1, 1, 1, &cpu_0, &gpu_0);
        unit_check_general<R>(1, 1, 1, &cpu_0, &gpu_1);

        return;
    }

    size_t size_x = size_t(N) * incx;

    // allocate memory on device
    device_vector<T>           dx(size_x);
    device_vector<rocblas_int> d_rocblas_result(1);
    CHECK_DEVICE_ALLOCATION(dx.memcheck());
    CHECK_DEVICE_ALLOCATION(d_rocblas_result.memcheck());

    // Naming: dx is in GPU (device) memory. hx is in CPU (host) memory, plz
    // follow this practice
    host_vector<T> hx(size_x);

    // Initial Data on CPU
    rocblas_init_vector(hx, arg, N, incx, 0, 1, rocblas_client_alpha_sets_nan, true);

    // copy data from CPU to device
    CHECK_HIP_ERROR(hipMemcpy(dx, hx, sizeof(T) * size_x, hipMemcpyHostToDevice));

    double gpu_time_used, cpu_time_used;

    if(arg.unit_check || arg.norm_check)
    {
        // GPU BLAS rocblas_pointer_mode_host
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_host));
        CHECK_ROCBLAS_ERROR(func(handle, N, dx, incx, &h_rocblas_result_1));

        // GPU BLAS, rocblas_pointer_mode_device
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_device));
        CHECK_ROCBLAS_ERROR(func(handle, N, dx, incx, d_rocblas_result));
        CHECK_HIP_ERROR(hipMemcpy(
            &h_rocblas_result_2, d_rocblas_result, sizeof(rocblas_int), hipMemcpyDeviceToHost));

        // CPU BLAS
        cpu_time_used = get_time_us_no_sync();
        rocblas_int cpu_result;
        REFBLAS_FUNC(N, hx, incx, &cpu_result);
        cpu_time_used = get_time_us_no_sync() - cpu_time_used;

        if(arg.unit_check)
        {
            unit_check_general<rocblas_int>(1, 1, 1, &cpu_result, &h_rocblas_result_1);
            unit_check_general<rocblas_int>(1, 1, 1, &cpu_result, &h_rocblas_result_2);
        }

        if(arg.norm_check)
        {
            rocblas_error_1 = h_rocblas_result_1 - cpu_result;
            rocblas_error_2 = h_rocblas_result_2 - cpu_result;
        }
    }

    if(arg.timing)
    {
        int number_cold_calls = arg.cold_iters;
        int number_hot_calls  = arg.iters;
        CHECK_ROCBLAS_ERROR(rocblas_set_pointer_mode(handle, rocblas_pointer_mode_device));

        for(int iter = 0; iter < number_cold_calls; iter++)
        {
            func(handle, N, dx, incx, d_rocblas_result);
        }

        hipStream_t stream;
        CHECK_ROCBLAS_ERROR(rocblas_get_stream(handle, &stream));
        gpu_time_used = get_time_us_sync(stream); // in microseconds

        for(int iter = 0; iter < number_hot_calls; iter++)
        {
            func(handle, N, dx, incx, d_rocblas_result);
        }

        gpu_time_used = (get_time_us_sync(stream) - gpu_time_used) / number_hot_calls;

        rocblas_cout << "N,incx,rocblas-us";

        if(arg.norm_check)
            rocblas_cout << ",cpu_time_used,rocblas_error_host_ptr,rocblas_error_dev_ptr";

        rocblas_cout << std::endl;

        rocblas_cout << (int)N << "," << incx << "," << gpu_time_used;

        if(arg.norm_check)
            rocblas_cout << "," << cpu_time_used << "," << rocblas_error_1 << ","
                         << rocblas_error_2;

        rocblas_cout << std::endl;
    }
}

template <typename T>
void testing_iamax(const Arguments& arg)
{
    const bool FORTRAN          = arg.fortran;
    auto       rocblas_iamax_fn = FORTRAN ? rocblas_iamax<T, true> : rocblas_iamax<T, false>;
    testing_iamax_iamin<T, rocblas_iamax_iamin_ref::iamax<T>>(arg, rocblas_iamax_fn);
}

template <typename T>
void testing_iamin(const Arguments& arg)
{
    const bool FORTRAN          = arg.fortran;
    auto       rocblas_iamin_fn = FORTRAN ? rocblas_iamin<T, true> : rocblas_iamin<T, false>;
    testing_iamax_iamin<T, rocblas_iamax_iamin_ref::iamin<T>>(arg, rocblas_iamin_fn);
}