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

#pragma once

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

#include "ck/library/tensor_operation_instance/gpu/convolution_backward_data.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_bwd_data.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_data_impl(int do_verification,
                                int init_method,
                                bool do_log,
                                bool time_kernel,
                                const ck::utils::conv::ConvParam& conv_param)
{
    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{};

    const auto in_g_n_c_wis_desc =
        ck::utils::conv::make_input_host_tensor_descriptor_g_n_c_wis_packed<InLayout>(conv_param);

    const auto wei_g_k_c_xs_desc =
        ck::utils::conv::make_weight_host_tensor_descriptor_g_k_c_xs_packed<WeiLayout>(conv_param);

    const auto out_g_n_k_wos_desc =
        ck::utils::conv::make_output_host_tensor_descriptor_g_n_k_wos_packed<OutLayout>(conv_param);

    Tensor<InDataType> input_host_result(in_g_n_c_wis_desc);
    Tensor<InDataType> input_device_result(in_g_n_c_wis_desc);
    Tensor<WeiDataType> weight(wei_g_k_c_xs_desc);
    Tensor<OutDataType> output(out_g_n_k_wos_desc);

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

    switch(init_method)
    {
    case 0: break;
    case 1:
        output.GenerateTensorValue(GeneratorTensor_2<OutDataType>{-5, 5});
        weight.GenerateTensorValue(GeneratorTensor_2<WeiDataType>{-5, 5});
        break;
    default:
        output.GenerateTensorValue(GeneratorTensor_3<OutDataType>{0.0, 1.0});
        weight.GenerateTensorValue(GeneratorTensor_3<WeiDataType>{-0.5, 0.5});
    }

    DeviceMem in_device_buf(sizeof(InDataType) * input_device_result.mDesc.GetElementSpaceSize());
    DeviceMem wei_device_buf(sizeof(WeiDataType) * weight.mDesc.GetElementSpaceSize());
    DeviceMem out_device_buf(sizeof(OutDataType) * output.mDesc.GetElementSpaceSize());

    out_device_buf.ToDevice(output.mData.data());
    wei_device_buf.ToDevice(weight.mData.data());

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

        auto ref_invoker = ref_conv.MakeInvoker();

        auto ref_argument = ref_conv.MakeArgument(input_host_result,
                                                  weight,
                                                  output,
                                                  conv_param.conv_filter_strides_,
                                                  conv_param.conv_filter_dilations_,
                                                  conv_param.input_left_pads_,
                                                  conv_param.input_right_pads_,
                                                  InElementOp{},
                                                  WeiElementOp{},
                                                  OutElementOp{});
        ref_invoker.Run(ref_argument);
    }

    using DeviceOp = ck::tensor_operation::device::DeviceConvBwdData<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)
    {
        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()),
                                        conv_param.N_,
                                        conv_param.K_,
                                        conv_param.C_,
                                        conv_param.input_spatial_lengths_,
                                        conv_param.filter_spatial_lengths_,
                                        conv_param.output_spatial_lengths_,
                                        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);

        if(op_ptr->IsSupportedArgument(argument_ptr.get()))
        {
            // for conv bwd data, some input tensor element are zero, but not written by kernel,
            // need to set zero
            in_device_buf.SetZero();

            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      = conv_param.GetFlops();
            std::size_t num_btype = conv_param.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: " << avg_time << " ms, " << tflops << " TFlops, " << gb_per_sec
                      << " GB/s" << 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)
            {
                in_device_buf.FromDevice(input_device_result.mData.data());

                pass =
                    pass & ck::utils::check_err(input_device_result.mData, input_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);
                    std::cout << std::endl;

                    std::cout << "out_host  : ";
                    show_data_nhwc_layout(input_host_result);
                    std::cout << std::endl;

                    std::cout << "out_device: ";
                    show_data_nhwc_layout(input_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