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

#pragma once

#include "ck/ck.hpp"
#include <iomanip>
#include <iostream>
#include <typeinfo>

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

#include "ck/library/tensor_operation_instance/gpu/convolution_backward_weight.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/reference_tensor_operation/cpu/reference_conv_backward_weight.hpp"

namespace ck {
namespace profiler {

template <typename DataType>
void show_data_nhwc_layout(Tensor<DataType>& nhwc)
{
    std::cout << "[";
    for(int n = 0; n < ck::type_convert<int>(nhwc.mDesc.GetLengths()[0]); n++)
    {
        std::cout << "[";
        for(int hi = 0; hi < ck::type_convert<int>(nhwc.mDesc.GetLengths()[2]); hi++)
        {
            std::cout << "[";
            for(int wi = 0; wi < ck::type_convert<int>(nhwc.mDesc.GetLengths()[3]); wi++)
            {
                std::cout << "[";
                for(int c = 0; c < ck::type_convert<int>(nhwc.mDesc.GetLengths()[1]); c++)
                {
                    std::cout << static_cast<float>(nhwc(n, c, hi, wi)) << "  ";
                }
                std::cout << "]";
            }
            std::cout << "]";
        }
        std::cout << "]";
    }
    std::cout << "]";
}

template <ck::index_t NDimSpatial,
          typename InLayout,
          typename WeiLayout,
          typename OutLayout,
          typename InDataType,
          typename WeiDataType,
          typename OutDataType>
bool profile_conv_bwd_weight_impl(int do_verification,
                                  int init_method,
                                  bool do_log,
                                  bool time_kernel,
                                  const ck::tensor_operation::device::ConvParams& params,
                                  ck::index_t split_k)
{
    // make host tensor descritpor
    auto f_nhwc_host_tensor_descriptor =
        [](ck::index_t n, ck::index_t c, std::vector<ck::index_t> spatial_lengths) {
            std::vector<std::size_t> nhwc_lengths{static_cast<std::size_t>(n),
                                                  static_cast<std::size_t>(c)};
            nhwc_lengths.insert(
                nhwc_lengths.begin() + 1, spatial_lengths.begin(), spatial_lengths.end());

            return HostTensorDescriptor(nhwc_lengths);
        };

    auto f_nchw_host_tensor_descriptor =
        [](ck::index_t n, ck::index_t c, std::vector<ck::index_t> spatial_lengths) {
            std::vector<std::size_t> nchw_lengths{static_cast<std::size_t>(n),
                                                  static_cast<std::size_t>(c)};
            nchw_lengths.insert(nchw_lengths.end(), spatial_lengths.begin(), spatial_lengths.end());

            return HostTensorDescriptor(nchw_lengths);
        };

    HostTensorDescriptor in_desc, wei_desc, out_desc;

    // FIXME: properly implement "make host descriptor" for different layout
    if constexpr(is_same_v<InLayout, ck::tensor_layout::convolution::NWC> ||
                 is_same_v<InLayout, ck::tensor_layout::convolution::NHWC> ||
                 is_same_v<InLayout, ck::tensor_layout::convolution::NDHWC>)
    {
        in_desc =
            f_nhwc_host_tensor_descriptor(params.N_, params.C_, params.input_spatial_lengths_);
    }
    else if constexpr(is_same_v<InLayout, ck::tensor_layout::convolution::NCW> ||
                      is_same_v<InLayout, ck::tensor_layout::convolution::NCHW> ||
                      is_same_v<InLayout, ck::tensor_layout::convolution::NCDHW>)
    {
        in_desc =
            f_nchw_host_tensor_descriptor(params.N_, params.C_, params.input_spatial_lengths_);
    }

    // FIXME: properly implement "make host descriptor" for different layout
    if constexpr(is_same_v<WeiLayout, ck::tensor_layout::convolution::KXC> ||
                 is_same_v<WeiLayout, ck::tensor_layout::convolution::KYXC> ||
                 is_same_v<WeiLayout, ck::tensor_layout::convolution::KZYXC>)
    {
        wei_desc =
            f_nhwc_host_tensor_descriptor(params.K_, params.C_, params.filter_spatial_lengths_);
    }
    else if constexpr(is_same_v<WeiLayout, ck::tensor_layout::convolution::KCX> ||
                      is_same_v<WeiLayout, ck::tensor_layout::convolution::KCYX> ||
                      is_same_v<WeiLayout, ck::tensor_layout::convolution::KCZYX>)
    {
        wei_desc =
            f_nchw_host_tensor_descriptor(params.K_, params.C_, params.filter_spatial_lengths_);
    }

    // FIXME: properly implement "make host descriptor" for different layout
    if constexpr(is_same_v<OutLayout, ck::tensor_layout::convolution::NWK> ||
                 is_same_v<OutLayout, ck::tensor_layout::convolution::NHWK> ||
                 is_same_v<OutLayout, ck::tensor_layout::convolution::NDHWK>)
    {
        out_desc =
            f_nhwc_host_tensor_descriptor(params.N_, params.K_, params.GetOutputSpatialLengths());
    }
    else if constexpr(is_same_v<OutLayout, ck::tensor_layout::convolution::NKW> ||
                      is_same_v<OutLayout, ck::tensor_layout::convolution::NKHW> ||
                      is_same_v<OutLayout, ck::tensor_layout::convolution::NKDHW>)
    {
        out_desc =
            f_nchw_host_tensor_descriptor(params.N_, params.K_, params.GetOutputSpatialLengths());
    }

    Tensor<InDataType> input(in_desc);
    Tensor<WeiDataType> weight_host_result(wei_desc);
    Tensor<WeiDataType> weight_device_result(wei_desc);
    Tensor<OutDataType> output(out_desc);

    std::cout << "input: " << input.mDesc << std::endl;
    std::cout << "weight: " << weight_host_result.mDesc << std::endl;
    std::cout << "output: " << output.mDesc << std::endl;

    switch(init_method)
    {
    case 0: break;
    case 1:
        input.GenerateTensorValue(GeneratorTensor_2<OutDataType>{-2, 2});
        output.GenerateTensorValue(GeneratorTensor_2<WeiDataType>{-2, 2});
        break;
    default:
        input.GenerateTensorValue(GeneratorTensor_1<OutDataType>{1});
        output.GenerateTensorValue(GeneratorTensor_1<WeiDataType>{1});
    }

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

    const auto in_element_op  = InElementOp{};
    const auto wei_element_op = WeiElementOp{};
    const auto out_element_op = OutElementOp{};

    DeviceMem in_device_buf(sizeof(InDataType) * input.mDesc.GetElementSpace());
    DeviceMem wei_device_buf(sizeof(WeiDataType) * weight_device_result.mDesc.GetElementSpace());
    DeviceMem out_device_buf(sizeof(OutDataType) * output.mDesc.GetElementSpace());

    in_device_buf.ToDevice(input.mData.data());
    out_device_buf.ToDevice(output.mData.data());

    if(do_verification)
    {
        auto ref_conv = ck::tensor_operation::host::ReferenceConvBwdWeight<NDimSpatial,
                                                                           InLayout,
                                                                           WeiLayout,
                                                                           OutLayout,
                                                                           InDataType,
                                                                           WeiDataType,
                                                                           OutDataType,
                                                                           InElementOp,
                                                                           WeiElementOp,
                                                                           OutElementOp>{};

        auto ref_invoker = ref_conv.MakeInvoker();

        auto ref_argument = ref_conv.MakeArgument(input,
                                                  weight_host_result,
                                                  output,
                                                  params.conv_filter_strides_,
                                                  params.conv_filter_dilations_,
                                                  params.input_left_pads_,
                                                  params.input_right_pads_,
                                                  in_element_op,
                                                  wei_element_op,
                                                  out_element_op);

        ref_invoker.Run(ref_argument);
    }

    using DeviceOp = ck::tensor_operation::device::DeviceConvBwdWeight<NDimSpatial,
                                                                       InLayout,
                                                                       WeiLayout,
                                                                       OutLayout,
                                                                       InDataType,
                                                                       WeiDataType,
                                                                       OutDataType,
                                                                       InElementOp,
                                                                       WeiElementOp,
                                                                       OutElementOp>;

    // get device op instances
    const auto op_ptrs = ck::tensor_operation::device::instance::DeviceOperationInstanceFactory<
        DeviceOp>::GetInstances();

    std::cout << "found " << op_ptrs.size() << " instances" << std::endl;

    std::string best_op_name;
    float best_avg_time   = 0;
    float best_tflops     = 0;
    float best_gb_per_sec = 0;

    // profile device Conv instances
    bool pass = true;

    for(auto& op_ptr : op_ptrs)
    {
        // using atomic, so need to reset input, setzero is done in invoker
        wei_device_buf.SetZero();

        auto argument_ptr =
            op_ptr->MakeArgumentPointer(static_cast<InDataType*>(in_device_buf.GetDeviceBuffer()),
                                        static_cast<WeiDataType*>(wei_device_buf.GetDeviceBuffer()),
                                        static_cast<OutDataType*>(out_device_buf.GetDeviceBuffer()),
                                        params.N_,
                                        params.K_,
                                        params.C_,
                                        params.input_spatial_lengths_,
                                        params.filter_spatial_lengths_,
                                        params.output_spatial_lengths_,
                                        params.conv_filter_strides_,
                                        params.conv_filter_dilations_,
                                        params.input_left_pads_,
                                        params.input_right_pads_,
                                        in_element_op,
                                        wei_element_op,
                                        out_element_op,
                                        split_k);

        if(op_ptr->IsSupportedArgument(argument_ptr.get()))
        {
            std::string op_name = op_ptr->GetTypeString();

            auto invoker_ptr = op_ptr->MakeInvokerPointer();

            float avg_time =
                invoker_ptr->Run(argument_ptr.get(), StreamConfig{nullptr, time_kernel});

            std::size_t flop      = params.GetFlops();
            std::size_t num_btype = params.GetByte<InDataType, WeiDataType, OutDataType>();

            float tflops     = static_cast<float>(flop) / 1.E9 / avg_time;
            float gb_per_sec = num_btype / 1.E6 / avg_time;

            std::cout << "Perf: " << std::setw(10) << avg_time << " ms, " << tflops << " TFlops, "
                      << gb_per_sec << " GB/s, " << op_name << std::endl;

            if(tflops > best_tflops)
            {
                best_op_name    = op_name;
                best_tflops     = tflops;
                best_avg_time   = avg_time;
                best_gb_per_sec = gb_per_sec;
            }

            if(do_verification)
            {
                wei_device_buf.FromDevice(weight_device_result.mData.data());

                pass = pass &
                       ck::utils::check_err(weight_device_result.mData, weight_host_result.mData);

                if(do_log)
                {
                    std::cout << "in : ";
                    show_data_nhwc_layout(output);
                    std::cout << std::endl;

                    std::cout << "wei: ";
                    show_data_nhwc_layout(weight_host_result);
                    std::cout << std::endl;

                    std::cout << "out  : ";
                    show_data_nhwc_layout(input);
                    std::cout << std::endl;

                    std::cout << "wei_device: ";
                    show_data_nhwc_layout(weight_device_result);
                    std::cout << std::endl;
                }
            }
        }
        else
        {
            std::cout << op_ptr->GetTypeString() << " does not support this problem" << std::endl;
        }
    }

    std::cout << "Best configuration parameters:"
              << "\nname: " << best_op_name << "\navg_time: " << best_avg_time
              << "\ntflops: " << best_tflops << "\nGB/s: " << best_gb_per_sec << std::endl;

    return pass;
}

} // namespace profiler
} // namespace ck