// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2022, Advanced Micro Devices, Inc. All rights reserved.

#include <iostream>
#include <cstdlib>

#include "ck/ck.hpp"
#include "ck/tensor_operation/gpu/element/binary_element_wise_operation.hpp"
#include "ck/tensor_operation/gpu/device/impl/device_elementwise_impl.hpp"

#include "ck/library/utility/check_err.hpp"
#include "ck/library/utility/device_memory.hpp"
#include "ck/library/utility/host_tensor.hpp"
#include "ck/library/utility/host_tensor_generator.hpp"
#include "ck/library/utility/literals.hpp"

using F16 = ck::half_t;
using F32 = float;

using ABDataType = F16;
using CDataType  = F16;

using Add = ck::tensor_operation::element_wise::Add;

using DeviceElementwiseAddInstance =
    ck::tensor_operation::device::DeviceElementwiseImpl<ck::Tuple<ABDataType, ABDataType>,
                                                        ck::Tuple<CDataType>,
                                                        Add,
                                                        2,
                                                        8,
                                                        ck::Sequence<8, 8>,
                                                        ck::Sequence<8>>;

template <typename HostTensorA,
          typename HostTensorB,
          typename HostTensorC,
          typename Functor,
          int broadcastDim>
void host_broadcast2D(
    HostTensorC& C, const HostTensorA& A, const HostTensorB& B, int M, int N, Functor functor)
{
    using ctype = ck::remove_reference_t<decltype(C(0, 0))>;

    for(int m = 0; m < M; ++m)
    {
        for(int n = 0; n < N; ++n)
        {
            auto Amn  = A(m, n);
            ctype Cmn = 0;
            if constexpr(broadcastDim == 0)
            {
                auto Bn = B(n);
                functor(Cmn, Amn, Bn);
            }
            else
            {
                auto Bm = B(m);
                functor(Cmn, Amn, Bm);
            }
            C(m, n) = Cmn;
        }
    }
}

int main()
{
    bool do_verification = true;
    bool time_kernel     = false;

    ck::index_t M      = 1024;
    ck::index_t N      = 1024;
    ck::index_t Stride = 1024;

    auto f_host_tensor_descriptor1d = [](std::size_t len, std::size_t stride) {
        return HostTensorDescriptor({len}, {stride});
    };

    auto f_host_tensor_descriptor2d = [](std::size_t row, std::size_t col, std::size_t stride) {
        using namespace ck::literals;

        return HostTensorDescriptor({row, col}, {stride, 1_uz});
    };

    Tensor<ABDataType> a_m_n(f_host_tensor_descriptor2d(M, N, Stride));
    Tensor<ABDataType> b_n(f_host_tensor_descriptor1d(N, 1));
    Tensor<CDataType> c_m_n(f_host_tensor_descriptor2d(M, N, Stride));

    a_m_n.GenerateTensorValue(GeneratorTensor_3<ABDataType>{0.0, 1.0});
    b_n.GenerateTensorValue(GeneratorTensor_3<ABDataType>{0.0, 1.0});

    DeviceMem a_m_n_device_buf(sizeof(ABDataType) * a_m_n.mDesc.GetElementSpaceSize());
    DeviceMem b_n_device_buf(sizeof(ABDataType) * b_n.mDesc.GetElementSpaceSize());
    DeviceMem c_m_n_device_buf(sizeof(CDataType) * c_m_n.mDesc.GetElementSpaceSize());

    a_m_n_device_buf.ToDevice(a_m_n.mData.data());
    b_n_device_buf.ToDevice(b_n.mData.data());

    std::array<const void*, 2> input = {a_m_n_device_buf.GetDeviceBuffer(),
                                        b_n_device_buf.GetDeviceBuffer()};
    std::array<void*, 1> output      = {c_m_n_device_buf.GetDeviceBuffer()};

    std::array<ck::index_t, 2> abc_lengths = {M, N};
    std::array<ck::index_t, 2> a_strides   = {Stride, 1};
    std::array<ck::index_t, 2> b_strides   = {0, 1};
    std::array<ck::index_t, 2> c_strides   = {Stride, 1};

    auto broadcastAdd = DeviceElementwiseAddInstance{};
    auto argument     = broadcastAdd.MakeArgumentPointer(
        abc_lengths, {a_strides, b_strides}, {c_strides}, input, output, Add{});

    if(!broadcastAdd.IsSupportedArgument(argument.get()))
    {
        throw std::runtime_error(
            "The runtime parameters seems not supported by the device instance, exiting!");
    };

    auto broadcastAdd_invoker_ptr = broadcastAdd.MakeInvokerPointer();
    float ave_time =
        broadcastAdd_invoker_ptr->Run(argument.get(), StreamConfig{nullptr, time_kernel});

    std::cout << "Perf: " << ave_time << " ms" << std::endl;

    bool pass = true;
    if(do_verification)
    {
        c_m_n_device_buf.FromDevice(c_m_n.mData.data());
        Tensor<CDataType> host_c_m_n(f_host_tensor_descriptor2d(M, N, Stride));

        host_broadcast2D<Tensor<ABDataType>, Tensor<ABDataType>, Tensor<CDataType>, Add, 0>(
            host_c_m_n, a_m_n, b_n, M, N, Add{});

        pass &= ck::utils::check_err(c_m_n, host_c_m_n, "Error: Incorrect results c", 1e-3, 1e-3);
    }

    return pass ? 0 : 1;
}
