// SPDX-License-Identifier: MIT
// Copyright (c) 2023-2024, Advanced Micro Devices, Inc. All rights reserved.

#include <cstdlib>
#include <iostream>
#include <numeric>
#include <type_traits>

#include "ck/ck.hpp"
#include "ck/tensor_operation/gpu/device/tensor_layout.hpp"
#include "ck/tensor_operation/gpu/element/element_wise_operation.hpp"
#include "ck/tensor_operation/gpu/device/impl/device_grouped_conv_fwd_multiple_abd_xdl_cshuffle.hpp"

#include "ck/library/utility/algorithm.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/convolution_parameter.hpp"
#include "ck/library/utility/convolution_host_tensor_descriptor_helper.hpp"
#include "ck/library/reference_tensor_operation/cpu/reference_conv_fwd.hpp"
#include "ck/library/utility/convolution_host_tensor_descriptor_helper.hpp"

constexpr ck::index_t NDimSpatial = 3;

template <ck::index_t... Is>
using S = ck::Sequence<Is...>;

using InLayout  = ck::tensor_layout::convolution::GNDHWC;
using WeiLayout = ck::tensor_layout::convolution::GKZYXC;
using OutLayout = ck::tensor_layout::convolution::GNDHWK;

using OutElementOp = ck::tensor_operation::element_wise::PassThrough;

static constexpr auto ConvSpec =
    ck::tensor_operation::device::ConvolutionForwardSpecialization::Default;

static constexpr auto GemmSpec = ck::tensor_operation::device::GemmSpecialization::MNKPadding;

template <typename DataType,
          typename AccDataType,
          typename InDataTypes,
          typename WeiDataTypes,
          typename InElementOp,
          typename WeiElementOp>
using DeviceGroupedConvNDMultiABFwdInstance =
    ck::tensor_operation::device::DeviceGroupedConvFwdMultipleABD_Xdl_CShuffle<
        NDimSpatial,
        InLayout,
        WeiLayout,
        ck::Tuple<>,
        OutLayout,
        InDataTypes,
        WeiDataTypes,
        AccDataType,
        DataType,
        ck::Tuple<>,
        DataType,
        InElementOp,
        WeiElementOp,
        OutElementOp,
        ConvSpec,    // ConvForwardSpecialization
        GemmSpec,    // GemmSpecialization
        1,           //
        256,         // BlockSize
        128,         // MPerBlock
        256,         // NPerBlock
        32,          // KPerBlock
        8,           // AK1
        8,           // BK1
        32,          // MPerXdl
        32,          // NPerXdl
        2,           // MXdlPerWave
        4,           // NXdlPerWave
        S<4, 64, 1>, // ABlockTransferThreadClusterLengths_AK0_M_AK1
        S<1, 0, 2>,  // ABlockTransferThreadClusterArrangeOrder
        S<1, 0, 2>,  // ABlockTransferSrcAccessOrder
        2,           // ABlockTransferSrcVectorDim
        8,           // ABlockTransferSrcScalarPerVector
        8,           // ABlockTransferDstScalarPerVector_AK1
        1,           // ABlockLdsExtraM
        S<4, 64, 1>, // BBlockTransferThreadClusterLengths_BK0_N_BK1
        S<1, 0, 2>,  // BBlockTransferThreadClusterArrangeOrder
        S<1, 0, 2>,  // BBlockTransferSrcAccessOrder
        2,           // BBlockTransferSrcVectorDim
        8,           // BBlockTransferSrcScalarPerVector
        8,           // BBlockTransferDstScalarPerVector_BK1
        1,           // BBlockLdsExtraN
        1,
        1,
        S<1, 32, 1, 8>,
        8>;

namespace {
template <ck::index_t NDimSpatial,
          typename InDataType,
          typename WeiDataType,
          typename OutDataType,
          typename InElementOp,
          typename WeiElementOp,
          typename OutElementOp,
          typename DeviceConvNDFwdInstance>
bool run_grouped_conv(bool do_verification,
                      int init_method,
                      bool time_kernel,
                      const ck::utils::conv::ConvParam& conv_param,
                      const HostTensorDescriptor& in_g_n_c_wis_desc,
                      const HostTensorDescriptor& wei_g_k_c_xs_desc,
                      const HostTensorDescriptor& out_g_n_k_wos_desc,
                      const InElementOp& in_element_op,
                      const WeiElementOp& wei_element_op,
                      const OutElementOp& out_element_op)
{
    constexpr ck::index_t NumAs = 2;
    constexpr ck::index_t NumBs = 2;
    Tensor<InDataType> in(in_g_n_c_wis_desc);
    Tensor<InDataType> in_bias(in_g_n_c_wis_desc);
    Tensor<WeiDataType> wei(wei_g_k_c_xs_desc);
    Tensor<WeiDataType> wei_bias(wei_g_k_c_xs_desc);
    Tensor<OutDataType> out_host(out_g_n_k_wos_desc);
    Tensor<OutDataType> out_device(out_g_n_k_wos_desc);

    std::cout << "in: " << in.mDesc << std::endl;
    std::cout << "wei: " << wei.mDesc << std::endl;
    std::cout << "out: " << out_host.mDesc << std::endl;

    switch(init_method)
    {
    case 0: break;
    case 1:
        in.GenerateTensorValue(GeneratorTensor_2<InDataType>{-2, 2});
        in_bias.GenerateTensorValue(GeneratorTensor_2<InDataType>{-2, 2});
        wei.GenerateTensorValue(GeneratorTensor_2<WeiDataType>{-2, 2});
        wei_bias.GenerateTensorValue(GeneratorTensor_2<WeiDataType>{-2, 2});
        break;
    default:
        in.GenerateTensorValue(GeneratorTensor_3<InDataType>{-1.0, 1.0});
        in_bias.GenerateTensorValue(GeneratorTensor_3<InDataType>{-1.0, 1.0});
        wei.GenerateTensorValue(GeneratorTensor_3<WeiDataType>{-0.05, 0.05});
        wei_bias.GenerateTensorValue(GeneratorTensor_3<WeiDataType>{-1.0, 1.0});
    }

    DeviceMem in_device_buf(sizeof(InDataType) * in.mDesc.GetElementSpaceSize());
    DeviceMem in_bias_device_buf(sizeof(InDataType) * in_bias.mDesc.GetElementSpaceSize());
    DeviceMem wei_device_buf(sizeof(WeiDataType) * wei.mDesc.GetElementSpaceSize());
    DeviceMem wei_bias_device_buf(sizeof(WeiDataType) * wei_bias.mDesc.GetElementSpaceSize());
    DeviceMem out_device_buf(sizeof(OutDataType) * out_device.mDesc.GetElementSpaceSize());

    in_device_buf.ToDevice(in.mData.data());
    in_bias_device_buf.ToDevice(in_bias.mData.data());
    wei_device_buf.ToDevice(wei.mData.data());
    wei_bias_device_buf.ToDevice(wei_bias.mData.data());

    std::array<ck::index_t, NDimSpatial + 3> a_g_n_c_wis_lengths{};
    std::array<ck::index_t, NDimSpatial + 3> a_g_n_c_wis_strides{};
    std::array<ck::index_t, NDimSpatial + 3> b_g_k_c_xs_lengths{};
    std::array<ck::index_t, NDimSpatial + 3> b_g_k_c_xs_strides{};
    std::array<ck::index_t, NDimSpatial + 3> e_g_n_k_wos_lengths{};
    std::array<ck::index_t, NDimSpatial + 3> e_g_n_k_wos_strides{};
    std::array<ck::index_t, NDimSpatial> conv_filter_strides{};
    std::array<ck::index_t, NDimSpatial> conv_filter_dilations{};
    std::array<ck::index_t, NDimSpatial> input_left_pads{};
    std::array<ck::index_t, NDimSpatial> input_right_pads{};

    auto copy = [](const auto& x, auto& y) { ck::ranges::copy(x, y.begin()); };

    copy(in_g_n_c_wis_desc.GetLengths(), a_g_n_c_wis_lengths);
    copy(in_g_n_c_wis_desc.GetStrides(), a_g_n_c_wis_strides);
    copy(wei_g_k_c_xs_desc.GetLengths(), b_g_k_c_xs_lengths);
    copy(wei_g_k_c_xs_desc.GetStrides(), b_g_k_c_xs_strides);
    copy(out_g_n_k_wos_desc.GetLengths(), e_g_n_k_wos_lengths);
    copy(out_g_n_k_wos_desc.GetStrides(), e_g_n_k_wos_strides);
    copy(conv_param.conv_filter_strides_, conv_filter_strides);
    copy(conv_param.conv_filter_dilations_, conv_filter_dilations);
    copy(conv_param.input_left_pads_, input_left_pads);
    copy(conv_param.input_right_pads_, input_right_pads);

    std::array<const void*, NumAs> as{in_device_buf.GetDeviceBuffer(),
                                      in_bias_device_buf.GetDeviceBuffer()};
    std::array<const void*, NumBs> bs{wei_device_buf.GetDeviceBuffer(),
                                      wei_bias_device_buf.GetDeviceBuffer()};
    std::array<const void*, 0> ds{};

    // do Conv
    auto conv     = DeviceConvNDFwdInstance{};
    auto invoker  = conv.MakeInvoker();
    auto argument = conv.MakeArgument(as,
                                      bs,
                                      ds,
                                      out_device_buf.GetDeviceBuffer(),
                                      a_g_n_c_wis_lengths,
                                      a_g_n_c_wis_strides,
                                      b_g_k_c_xs_lengths,
                                      b_g_k_c_xs_strides,
                                      {},
                                      {},
                                      e_g_n_k_wos_lengths,
                                      e_g_n_k_wos_strides,
                                      conv_filter_strides,
                                      conv_filter_dilations,
                                      input_left_pads,
                                      input_right_pads,
                                      in_element_op,
                                      wei_element_op,
                                      out_element_op);

    if(!conv.IsSupportedArgument(argument))
    {
        throw std::runtime_error(
            "wrong! device_conv with the specified compilation parameters does "
            "not support this Conv problem");
    }

    float avg_time = invoker.Run(argument, StreamConfig{nullptr, time_kernel});

    std::size_t flop = conv_param.GetFlops() +
                       2 * conv_param.GetOutputByte<InDataType>() / sizeof(InDataType) +
                       2 * conv_param.GetOutputByte<WeiDataType>() / sizeof(WeiDataType);
    std::size_t num_btype = conv_param.GetByte<InDataType, WeiDataType, OutDataType>() +
                            conv_param.GetInputByte<InDataType>() +
                            conv_param.GetWeightByte<WeiDataType>();

    float tflops     = static_cast<float>(flop) / 1.E9 / avg_time;
    float gb_per_sec = num_btype / 1.E6 / avg_time;
    std::cout << "Perf: " << avg_time << " ms, " << tflops << " TFlops, " << gb_per_sec << " GB/s, "
              << conv.GetTypeString() << std::endl;

    if(do_verification)
    {
        const std::array<Tensor<InDataType>, NumAs - 1> elementwise_a_tensors  = {in_bias};
        const std::array<Tensor<WeiDataType>, NumBs - 1> elementwise_b_tensors = {wei_bias};
        auto ref_conv = ck::tensor_operation::host::ReferenceConvFwd<NDimSpatial,
                                                                     InDataType,
                                                                     WeiDataType,
                                                                     OutDataType,
                                                                     InElementOp,
                                                                     WeiElementOp,
                                                                     OutElementOp,
                                                                     NumAs - 1,
                                                                     NumBs - 1>();

        auto ref_invoker  = ref_conv.MakeInvoker();
        auto ref_argument = ref_conv.MakeArgument(in,
                                                  wei,
                                                  out_host,
                                                  conv_param.conv_filter_strides_,
                                                  conv_param.conv_filter_dilations_,
                                                  conv_param.input_left_pads_,
                                                  conv_param.input_right_pads_,
                                                  in_element_op,
                                                  wei_element_op,
                                                  out_element_op,
                                                  elementwise_a_tensors,
                                                  elementwise_b_tensors);

        ref_invoker.Run(ref_argument);

        out_device_buf.FromDevice(out_device.mData.data());

        return ck::utils::check_err(out_device, out_host, "Error: incorrect results!");
    }

    return true;
}

} // namespace
