// SPDX-License-Identifier: MIT
// Copyright (c) 2018-2023, Advanced Micro Devices, Inc. All rights reserved.

#include <limits>
#include <iostream>
#include <vector>
#include <array>
#include <algorithm>
#include <getopt.h>

#include "ck/ck.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/host_common_util.hpp"
#include "ck/tensor_operation/gpu/element/element_wise_operation.hpp"
#include "ck/library/reference_tensor_operation/cpu/reference_batchnorm_infer.hpp"

#include "batchnorm_infer_impl.hpp"

static struct option long_options[] = {{"inOutLengths", required_argument, nullptr, 'D'},
                                       {"verify", required_argument, nullptr, 'v'},
                                       {"help", no_argument, nullptr, '?'},
                                       {nullptr, 0, nullptr, 0}};

class BatchNormInferArg
{
    private:
    int option_index = 0;

    public:
    std::vector<size_t> inOutLengths;

    bool do_verification = false;

    int data_type    = 0;
    int init_method  = 2;
    bool time_kernel = false;

    public:
    void show_usage(const char* cmd)
    {
        std::cout << "Usage of " << cmd << std::endl;
        std::cout << "--inOutLengths or -D, comma separated list of input tensor dimension "
                     "lengths, must have 4 integers for nhwc"
                  << std::endl;
        std::cout << "--verify or -v, 1/0 to indicate whether to verify the batch-normalization "
                     "result by "
                     "comparing with the host-based batch-normalization"
                  << std::endl;
        std::cout << "Arg1: data type (0: fp16, 1: fp32, 3: int8, 5: bp16, 6: fp64)" << std::endl;
        std::cout << "Arg2: init method used for bnScale and bnBias (0=no init, 1=single integer "
                     "value, 2=scope integer "
                     "value, 3=decimal value)"
                  << std::endl;
        std::cout << "Arg3: time kernel (0=no, 1=yes)" << std::endl;
    };

    int processArgs(int argc, char* argv[])
    {
        using ck::host_common::getTypeValuesFromString;

        int ch;

        while(1)
        {
            ch = getopt_long(argc, argv, "D:v:", long_options, &option_index);
            if(ch == -1)
                break;
            switch(ch)
            {
            case 'D':
                if(!optarg)
                    throw std::runtime_error("Invalid option format!");

                inOutLengths = getTypeValuesFromString<size_t>(optarg);

                if(inOutLengths.size() != 4)
                    throw std::runtime_error(
                        "NHWC tensor layout should have 4 length values specified!");
                break;
            case 'v':
                if(!optarg)
                    throw std::runtime_error("Invalid option format!");

                do_verification = static_cast<bool>(std::atoi(optarg));
                break;
            case '?':
                if(std::string(long_options[option_index].name) == "help")
                {
                    show_usage(argv[0]);
                    return (-1);
                };
                break;
            default: show_usage(argv[0]); return (-1);
            };
        };

        if(optind + 3 > argc)
            throw std::runtime_error("Invalid cmd-line arguments, more argumetns are needed!");

        data_type   = std::atoi(argv[optind++]);
        init_method = std::atoi(argv[optind++]);
        time_kernel = static_cast<bool>(std::atoi(argv[optind]));

        if(data_type != 0 && data_type != 1 && data_type != 3 && data_type != 5 && data_type != 6)
            return (-1);

        return (0);
    };
};

using namespace ck;

template <typename InOutDataType, typename AccDataType>
bool bnorm_infer_nhwc_test(bool do_verification,
                           int init_method,
                           bool time_kernel,
                           const std::vector<size_t> inOutLengths,
                           double _epsilon)
{
    // for NHWC BatchNorm calculation of mean and meansquare
    constexpr int Rank         = 4;
    constexpr int NumReduceDim = 3;

    // when using lengths[] to create a tensor, lengths[0] is the length of highest dimension
    // eg. N of NHWC, so lengths[3] is the dimension C length of NHWC
    const std::vector<size_t> scaleBiasMeanVarLengths = {inOutLengths[3]};

    // input data of the batchnorm forward algorithm
    Tensor<InOutDataType> x(inOutLengths);
    Tensor<AccDataType> bnScale(scaleBiasMeanVarLengths);
    Tensor<AccDataType> bnBias(scaleBiasMeanVarLengths);

    // output data of the batchnorm forward algorithm
    Tensor<InOutDataType> y_ref(inOutLengths);
    Tensor<InOutDataType> y(inOutLengths);

    Tensor<AccDataType> estimatedMean(scaleBiasMeanVarLengths);
    Tensor<AccDataType> estimatedVariance(scaleBiasMeanVarLengths);

    auto inOutStrides            = x.mDesc.GetStrides();
    auto scaleBiasMeanVarStrides = bnScale.mDesc.GetStrides();

    std::size_t num_thread = std::thread::hardware_concurrency();

    if constexpr(std::is_same<InOutDataType, int8_t>::value)
    {
        x.GenerateTensorValue(GeneratorTensor_2<InOutDataType>{-5, 5}, num_thread);

        const float x_mean       = 0.0f;
        const float x_stddev     = 2.5f;
        const float noise_stddev = 0.0001f;

        estimatedMean.GenerateTensorValue(GeneratorTensor_4<AccDataType>{x_mean, noise_stddev},
                                          num_thread);

        estimatedVariance.GenerateTensorValue(
            GeneratorTensor_4<AccDataType>{x_stddev * x_stddev, noise_stddev}, num_thread);
    }
    else
    {
        const float x_mean       = 0.0f;
        const float x_stddev     = 1.0f;
        const float noise_stddev = 0.0001f;

        x.GenerateTensorValue(GeneratorTensor_4<InOutDataType>{x_mean, x_stddev}, num_thread);

        // initialize the savedMean to be values with tiny variation to the mean of the x values
        estimatedMean.GenerateTensorValue(GeneratorTensor_4<AccDataType>{x_mean, noise_stddev},
                                          num_thread);

        // initialize the variance to be values with tiny variation to the variance of the x values
        estimatedVariance.GenerateTensorValue(
            GeneratorTensor_4<AccDataType>{x_stddev * x_stddev, noise_stddev}, num_thread);
    };

    if(do_verification)
    {
        switch(init_method)
        {
        case 0:
            bnScale.GenerateTensorValue(GeneratorTensor_0<AccDataType>{}, num_thread);
            bnBias.GenerateTensorValue(GeneratorTensor_0<AccDataType>{}, num_thread);
            break;
        case 1:
            bnScale.GenerateTensorValue(GeneratorTensor_1<AccDataType>{1}, num_thread);
            bnBias.GenerateTensorValue(GeneratorTensor_1<AccDataType>{0}, num_thread);
            break;
        case 2:
            bnScale.GenerateTensorValue(GeneratorTensor_2<AccDataType>{-5, 5}, num_thread);
            bnBias.GenerateTensorValue(GeneratorTensor_2<AccDataType>{-5, 5}, num_thread);
            break;
        default:
            bnScale.GenerateTensorValue(GeneratorTensor_3<AccDataType>{-5.0f, 5.0f}, num_thread);
            bnBias.GenerateTensorValue(GeneratorTensor_3<AccDataType>{-5.0f, 5.0f}, num_thread);
        }
    };

    // these buffers are usually provided by the user application
    DeviceMem x_dev(sizeof(InOutDataType) * x.mDesc.GetElementSpaceSize());
    DeviceMem y_dev(sizeof(InOutDataType) * y.mDesc.GetElementSpaceSize());
    DeviceMem bnScale_dev(sizeof(AccDataType) * bnScale.mDesc.GetElementSpaceSize());
    DeviceMem bnBias_dev(sizeof(AccDataType) * bnBias.mDesc.GetElementSpaceSize());

    // mean_dev or resultSaveMean_dev
    DeviceMem estimatedMean_dev(sizeof(AccDataType) * estimatedMean.mDesc.GetElementSpaceSize());
    // meansquare_dev or resultSaveInvVariance_dev
    DeviceMem estimatedVariance_dev(sizeof(AccDataType) *
                                    estimatedVariance.mDesc.GetElementSpaceSize());

    x_dev.ToDevice(x.mData.data());
    bnScale_dev.ToDevice(bnScale.mData.data());
    bnBias_dev.ToDevice(bnBias.mData.data());
    estimatedMean_dev.ToDevice(estimatedMean.mData.data());
    estimatedVariance_dev.ToDevice(estimatedVariance.mData.data());

    using ck::index_t;

    std::array<index_t, Rank> i_inOutLengths;
    std::array<index_t, Rank> i_inOutStrides;
    std::array<index_t, Rank - NumReduceDim> i_scaleBiasMeanVarLengths;
    std::array<index_t, Rank - NumReduceDim> i_scaleBiasMeanVarStrides;

    ck::ranges::copy(inOutLengths, i_inOutLengths.begin());
    ck::ranges::copy(inOutStrides, i_inOutStrides.begin());
    ck::ranges::copy(scaleBiasMeanVarLengths, i_scaleBiasMeanVarLengths.begin());
    ck::ranges::copy(scaleBiasMeanVarStrides, i_scaleBiasMeanVarStrides.begin());

    int result = 0;

    result = bnorm_infer<InOutDataType,
                         InOutDataType,
                         AccDataType,
                         AccDataType,
                         AccDataType,
                         AccDataType,
                         Rank,
                         NumReduceDim,
                         false>(time_kernel,
                                {0, 1, 2},
                                i_inOutLengths,
                                i_inOutStrides,
                                i_inOutStrides,
                                i_scaleBiasMeanVarLengths,
                                i_scaleBiasMeanVarStrides,
                                i_scaleBiasMeanVarStrides,
                                i_scaleBiasMeanVarStrides,
                                x_dev.GetDeviceBuffer(),
                                bnScale_dev.GetDeviceBuffer(),
                                bnBias_dev.GetDeviceBuffer(),
                                _epsilon,
                                estimatedMean_dev.GetDeviceBuffer(),
                                estimatedVariance_dev.GetDeviceBuffer(),
                                y_dev.GetDeviceBuffer());

    if(result < 0)
        return (false);

    bool pass = true;

    if(do_verification)
    {
        using PassThroughOp = ck::tensor_operation::element_wise::PassThrough;

        using ReferenceBatchNormInferInstance =
            ck::tensor_operation::host::ReferenceBatchNormInfer<InOutDataType,
                                                                InOutDataType,
                                                                AccDataType,
                                                                AccDataType,
                                                                AccDataType,
                                                                AccDataType,
                                                                PassThroughOp,
                                                                Rank,
                                                                NumReduceDim>;
        auto batchNormInfer_ref = ReferenceBatchNormInferInstance{};

        auto argument_ptr_ref =
            batchNormInfer_ref.MakeArgumentPointer(i_inOutLengths,
                                                   i_inOutStrides,
                                                   i_inOutStrides,
                                                   {0, 1, 2},
                                                   i_scaleBiasMeanVarLengths,
                                                   i_scaleBiasMeanVarStrides,
                                                   i_scaleBiasMeanVarStrides,
                                                   i_scaleBiasMeanVarStrides,
                                                   x.mData.data(),
                                                   bnScale.mData.data(),
                                                   bnBias.mData.data(),
                                                   _epsilon,
                                                   PassThroughOp{},
                                                   estimatedMean.mData.data(),
                                                   estimatedVariance.mData.data(),
                                                   y_ref.mData.data());

        if(!batchNormInfer_ref.IsSupportedArgument(argument_ptr_ref.get()))
        {
            std::cout
                << "The runtime parameters seems not supported by the BatchNorm instance, exiting!"
                << std::endl;
            return (-2);
        };

        auto invoker_ptr_ref = batchNormInfer_ref.MakeInvokerPointer();

        (void)invoker_ptr_ref->Run(argument_ptr_ref.get());

        y_dev.FromDevice(y.mData.data());
        pass = pass && ck::utils::check_err(y, y_ref);
    };

    return (pass);
};

static const double epsilon = std::numeric_limits<float>::epsilon();

int main(int argc, char* argv[])
{
    bool pass = true;

    if(argc > 1)
    {
        BatchNormInferArg arg;

        if(arg.processArgs(argc, argv) < 0)
            return (-1);

        if(arg.data_type == 0)
        {
            pass = bnorm_infer_nhwc_test<ck::half_t, float>(
                arg.do_verification, arg.init_method, arg.time_kernel, arg.inOutLengths, epsilon);
        }
        else if(arg.data_type == 1)
        {
            pass = bnorm_infer_nhwc_test<float, float>(
                arg.do_verification, arg.init_method, arg.time_kernel, arg.inOutLengths, epsilon);
        }
        else if(arg.data_type == 3)
        {
            pass = bnorm_infer_nhwc_test<int8_t, float>(
                arg.do_verification, arg.init_method, arg.time_kernel, arg.inOutLengths, epsilon);
        }
        else if(arg.data_type == 5)
        {
            pass = bnorm_infer_nhwc_test<ck::bhalf_t, float>(
                arg.do_verification, arg.init_method, arg.time_kernel, arg.inOutLengths, epsilon);
        }
        else if(arg.data_type == 6)
        {
            pass = bnorm_infer_nhwc_test<double, double>(
                arg.do_verification, arg.init_method, arg.time_kernel, arg.inOutLengths, epsilon);
        };
    }
    else
    {
        pass = bnorm_infer_nhwc_test<ck::half_t, float>(true,
                                                        2,
                                                        false, // don't time kernel
                                                        {128, 16, 16, 1024},
                                                        epsilon);
    };

    return (pass ? 0 : 1);
}
