#include "ck_tile/host.hpp"
#include "smoothquant.hpp"
#include <cstring>

// different threshold for different dtype
template <typename DataType>
auto get_elimit()
{
    double rtol = 1e-5;
    double atol = 1e-5;
    return ck_tile::make_tuple(rtol, atol);
}

template <>
auto get_elimit<ck_tile::bf16_t>()
{
    double rtol = 1e-5;
    double atol = 1e-5;
    return ck_tile::make_tuple(rtol, atol);
}

template <>
auto get_elimit<ck_tile::int8_t>()
{
    // due to rounding, int8 quantization might have 1 abs error
    double rtol = 1;
    double atol = 1;
    return ck_tile::make_tuple(rtol, atol);
}

auto create_args(int argc, char* argv[])
{
    ck_tile::ArgParser arg_parser;
    arg_parser.insert("m", "3328", "m dimension")
        .insert("n", "4096", "n dimension")
        .insert("x_stride", "-1", "input stride per row, if -1 then equal to n")
        .insert("y_stride", "-1", "output stride per row, if -1 then equal to n")
        .insert("v", "1", "cpu validation or not")
        .insert("kname", "1", "print kernel name or not")
        .insert("prec", "fp16", "precision")
        .insert("warmup", "5", "cold iter")
        .insert("repeat", "20", "hot iter");

    bool result = arg_parser.parse(argc, argv);
    return std::make_tuple(result, arg_parser);
}

template <typename DataType>
bool run(const ck_tile::ArgParser& arg_parser)
{
    ck_tile::index_t m        = arg_parser.get_int("m");
    ck_tile::index_t n        = arg_parser.get_int("n");
    ck_tile::index_t x_stride = arg_parser.get_int("x_stride");
    if(x_stride < 0)
        x_stride = n;
    ck_tile::index_t y_stride = arg_parser.get_int("y_stride");
    if(y_stride < 0)
        y_stride = n;
    std::string data_type = arg_parser.get_str("prec");
    int kname             = arg_parser.get_int("kname");
    int do_validation     = arg_parser.get_int("v");
    int warmup            = arg_parser.get_int("warmup");
    int repeat            = arg_parser.get_int("repeat");

    assert(x_stride >= n);

    using TypeConfig = SmoothquantTypeConfig<DataType>;

    using XDataType       = typename TypeConfig::XDataType;
    using XScaleDataType  = typename TypeConfig::XScaleDataType;
    using YScaleDataType  = typename TypeConfig::YScaleDataType;
    using QYDataType      = typename TypeConfig::QYDataType;
    using ComputeDataType = typename TypeConfig::ComputeDataType;

    // host verify
    ck_tile::HostTensor<XDataType> x_host({m, n}, {x_stride, 1});
    ck_tile::HostTensor<XScaleDataType> xscale_host({n});

    ck_tile::HostTensor<YScaleDataType> yscale_host_ref({m}, {1});
    ck_tile::HostTensor<YScaleDataType> yscale_host_dev({m}, {1});

    ck_tile::HostTensor<QYDataType> qy_host_ref({m, n}, {y_stride, 1});
    ck_tile::HostTensor<QYDataType> qy_host_dev({m, n}, {y_stride, 1});

    ck_tile::FillUniformDistribution<XDataType>{-.5f, .5f}(x_host);
    ck_tile::FillUniformDistribution<XScaleDataType>{1e-3, .5f}(xscale_host);

    ck_tile::DeviceMem x_buf(x_host.get_element_space_size_in_bytes());
    ck_tile::DeviceMem xscale_buf(xscale_host.get_element_space_size_in_bytes());
    ck_tile::DeviceMem yscale_buf(yscale_host_dev.get_element_space_size_in_bytes());
    ck_tile::DeviceMem qy_buf(qy_host_dev.get_element_space_size_in_bytes());

    x_buf.ToDevice(x_host.data());
    xscale_buf.ToDevice(xscale_host.data());

    std::cout << "[" << data_type << "]"
              << " m:" << m << ", n:" << n << ", x_stride:" << x_stride << ", y_stride:" << y_stride
              << std::flush;

    smoothquant_traits traits{data_type};

    smoothquant_args args{x_buf.GetDeviceBuffer(),
                          xscale_buf.GetDeviceBuffer(),
                          yscale_buf.GetDeviceBuffer(),
                          qy_buf.GetDeviceBuffer(),
                          m,
                          n,
                          x_stride,
                          y_stride};

    float ave_time = smoothquant(
        traits, args, ck_tile::stream_config{nullptr, true, kname ? 1 : 0, warmup, repeat});

    std::size_t num_byte = sizeof(XDataType) * m * n + sizeof(XScaleDataType) * n +
                           sizeof(YScaleDataType) * m + sizeof(QYDataType) * m * n;

    float gb_per_sec = num_byte / 1.E6 / ave_time;
    std::cout << ", " << ave_time * 1.E3 << " us, " << gb_per_sec << " GB/s" << std::flush;

    bool pass = true;

    if(do_validation)
    {
        using YDataType = ComputeDataType;
        ck_tile::HostTensor<ComputeDataType> y_host({m, n}, {y_stride, 1});
        // smooth outlier
        {
            auto f = [&](auto n_) {
                auto v_xscale = ck_tile::type_convert<ComputeDataType>(xscale_host(n_));

                for(int m_ = 0; m_ < m; ++m_)
                {
                    auto v_x       = ck_tile::type_convert<ComputeDataType>(x_host(m_, n_));
                    y_host(m_, n_) = v_x * v_xscale;
                }
            };

            ck_tile::make_ParallelTensorFunctor(f, xscale_host.get_element_space_size())(
                std::thread::hardware_concurrency());
        }

        // yscale
        {
            ck_tile::HostTensor<YDataType> y_rowwise_amax_host({m});

            using ReduceAmax = ck_tile::ReduceOp::AbsMax;
            ck_tile::reference_reduce<ComputeDataType, ComputeDataType, YDataType>(
                y_host, y_rowwise_amax_host, ReduceAmax{});

            auto op = [](const auto& v0) {
                return v0 /
                       ck_tile::type_convert<ComputeDataType>(ck_tile::numeric<QYDataType>::max());
            };
            ck_tile::reference_unary_elementwise<YDataType, YScaleDataType, ComputeDataType>(
                y_rowwise_amax_host, yscale_host_ref, op);

            yscale_buf.FromDevice(yscale_host_dev.mData.data());

            auto [rtol, atol] = get_elimit<YScaleDataType>();
            pass &= ck_tile::check_err(yscale_host_dev,
                                       yscale_host_ref,
                                       std::string("yscale Error: Incorrect results!"),
                                       rtol,
                                       atol);
        }

        // rowwise quantization
        {
            ck_tile::reference_rowwise_quantization2d<YDataType, YScaleDataType, QYDataType>(
                y_host, yscale_host_ref, qy_host_ref);

            qy_buf.FromDevice(qy_host_dev.data());
            auto [rtol, atol] = get_elimit<QYDataType>();

            if(y_stride == n)
            {
                pass = ck_tile::check_err(qy_host_dev,
                                          qy_host_ref,
                                          std::string("qy Error: Incorrect results!"),
                                          rtol,
                                          atol);
            }
            else
            {
                for(int i_r = 0; i_r < m; i_r++)
                {
                    std::vector<QYDataType> qy_host_dev_row(qy_host_dev.begin() + i_r * y_stride,
                                                            qy_host_dev.begin() + i_r * y_stride +
                                                                n);
                    std::vector<QYDataType> qy_host_ref_row(qy_host_ref.begin() + i_r * y_stride,
                                                            qy_host_ref.begin() + i_r * y_stride +
                                                                n);
                    pass &= ck_tile::check_err(qy_host_dev_row,
                                               qy_host_ref_row,
                                               std::string("qy[") + std::to_string(i_r) +
                                                   std::string("] Error: Incorrect results!"),
                                               rtol,
                                               atol);
                }
            }
        }

        std::cout << ", valid:" << (pass ? "y" : "n") << std::flush << std::endl;
    }

    return pass;
}

int main(int argc, char* argv[])
{
    auto [result, arg_parser] = create_args(argc, argv);
    if(!result)
        return -1;

    const std::string data_type = arg_parser.get_str("prec");
    if(data_type == "fp16")
    {
        return run<ck_tile::half_t>(arg_parser) ? 0 : -2;
    }
    else if(data_type == "bf16")
    {
        return run<ck_tile::bf16_t>(arg_parser) ? 0 : -2;
    }

    return -3;
}