// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2022, 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/device/device_convnd_fwd_nwc_kxc_nwk_xdl.hpp"
#include "ck/tensor_operation/gpu/element/element_wise_operation.hpp"

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

#include "ck/library/utility/convolution_parameter.hpp"

ck::tensor_operation::device::ConvParams
parse_conv_params(int num_dim_spatial, int arg_idx, char* const argv[])
{
    ck::tensor_operation::device::ConvParams params;

    params.num_dim_spatial_ = num_dim_spatial;
    params.N_               = std::stoi(argv[arg_idx++]);
    params.K_               = std::stoi(argv[arg_idx++]);
    params.C_               = std::stoi(argv[arg_idx++]);

    params.filter_spatial_lengths_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.filter_spatial_lengths_[i] = std::stoi(argv[arg_idx++]);
    }
    params.input_spatial_lengths_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.input_spatial_lengths_[i] = std::stoi(argv[arg_idx++]);
    }
    params.conv_filter_strides_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.conv_filter_strides_[i] = std::stoi(argv[arg_idx++]);
    }
    params.conv_filter_dilations_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.conv_filter_dilations_[i] = std::stoi(argv[arg_idx++]);
    }
    params.input_left_pads_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.input_left_pads_[i] = std::stoi(argv[arg_idx++]);
    }
    params.input_right_pads_.resize(num_dim_spatial);
    for(int i = 0; i < num_dim_spatial; ++i)
    {
        params.input_right_pads_[i] = std::stoi(argv[arg_idx++]);
    }

    return params;
}

void print_helper_msg()
{
    std::cout << "arg1: verification (0=no, 1=yes)\n"
              << "arg2: initialization (0=no init, 1=integer value, 2=decimal value)\n"
              << "arg3: time kernel (0=n0, 1=yes)\n"
              << "arg4: N spatial dimensions (default 2)\n"
              << "Following arguments (depending on number of spatial dims):\n"
              << " N, K, C, \n"
              << " <filter spatial dimensions>, (ie Y, X for 2D)\n"
              << " <input image spatial dimensions>, (ie Hi, Wi for 2D)\n"
              << " <strides>, (ie Sy, Sx for 2D)\n"
              << " <dilations>, (ie Dy, Dx for 2D)\n"
              << " <left padding>, (ie LeftPy, LeftPx for 2D)\n"
              << " <right padding>, (ie RightPy, RightPx for 2D)\n"
              << std::endl;
}

template <ck::index_t NDimSpatial,
          typename InDataType,
          typename WeiDataType,
          typename OutDataType,
          typename AccDataType,
          typename InElementOp,
          typename WeiElementOp,
          typename OutElementOp,
          typename DeviceConvNDFwdInstance,
          typename ReferenceConvNDFwdInstance>
int run_conv_fwd(const ck::tensor_operation::device::ConvParams& params,
                 bool do_verification,
                 int init_method,
                 bool time_kernel)
{
    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> 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 transpose_host_tensor_descriptor_given_new2old(
                HostTensorDescriptor(nhwc_lengths), std::vector<std::size_t>({0, 3, 1, 2}));
        };

    Tensor<InDataType> input(
        f_nchw_host_tensor_descriptor(params.N_, params.C_, params.input_spatial_lengths_));
    Tensor<InDataType> weights(
        f_nchw_host_tensor_descriptor(params.K_, params.C_, params.filter_spatial_lengths_));
    Tensor<InDataType> host_output(
        f_nchw_host_tensor_descriptor(params.N_, params.K_, params.GetOutputSpatialLengths()));
    Tensor<InDataType> device_output(
        f_nchw_host_tensor_descriptor(params.N_, params.K_, params.GetOutputSpatialLengths()));

    std::cout << "input: " << input.mDesc << std::endl;
    std::cout << "weights: " << weights.mDesc << std::endl;
    std::cout << "output: " << host_output.mDesc << std::endl;

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

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

    in_device_buf.ToDevice(input.mData.data());
    wei_device_buf.ToDevice(weights.mData.data());

    // do GEMM
    auto conv     = DeviceConvNDFwdInstance{};
    auto invoker  = conv.MakeInvoker();
    auto argument = conv.MakeArgument(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.GetOutputSpatialLengths(),
                                      params.conv_filter_strides_,
                                      params.conv_filter_dilations_,
                                      params.input_left_pads_,
                                      params.input_right_pads_,
                                      InElementOp{},
                                      WeiElementOp{},
                                      OutElementOp{});

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

    float ave_time = invoker.Run(argument, 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 / ave_time;
    float gb_per_sec = num_btype / 1.E6 / ave_time;
    std::cout << "Perf: " << ave_time << " ms, " << tflops << " TFlops, " << gb_per_sec << " GB/s, "
              << conv.GetTypeString() << std::endl;

    if(do_verification)
    {
        auto ref_conv = ReferenceConvNDFwdInstance();

        auto ref_invoker  = ref_conv.MakeInvoker();
        auto ref_argument = ref_conv.MakeArgument(input,
                                                  weights,
                                                  host_output,
                                                  params.conv_filter_strides_,
                                                  params.conv_filter_dilations_,
                                                  params.input_left_pads_,
                                                  params.input_right_pads_,
                                                  InElementOp{},
                                                  WeiElementOp{},
                                                  OutElementOp{});

        ref_invoker.Run(ref_argument);

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

        return ck::utils::check_err(host_output.mData,
                                    device_output.mData,
                                    "Error: incorrect results!",
                                    1e-5f,
                                    1e-4f)
                   ? 0
                   : 1;
    }

    return 0;
}
