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

#pragma once

#ifndef NUM_ELEMS_IN_BUNDLE
#define NUM_ELEMS_IN_BUNDLE 1
#endif

bool run_permute(const ExecutionConfig& config, const Problem& problem)
{
#if 1 < NUM_ELEMS_IN_BUNDLE
    static_assert(std::is_same_v<ADataType, BDataType> &&
                  (sizeof(ADataType) % NUM_ELEMS_IN_BUNDLE == 0));
#endif

    using std::begin, std::end;

    const auto& shape = problem.shape;
    ck::remove_cvref_t<decltype(shape)> transposed_shape;
    transpose_shape(problem.shape, problem.axes, begin(transposed_shape));

    Tensor<ADataType> a(shape);
    Tensor<BDataType> b(transposed_shape);

    using std::data, std::size;
    {
        auto* const elems =
            reinterpret_cast<detail::get_bundled_t<ADataType, NUM_ELEMS_IN_BUNDLE>*>(data(a.mData));
        std::iota(elems, elems + (size(a.mData) * NUM_ELEMS_IN_BUNDLE), 1);
    }

    DeviceMem a_device_buf(sizeof(ADataType) * a.mDesc.GetElementSpaceSize());
    DeviceMem b_device_buf(sizeof(BDataType) * b.mDesc.GetElementSpaceSize());

    a_device_buf.ToDevice(data(a.mData));

    std::array<ck::index_t, 3> a_lengths, b_lengths;
    std::array<ck::index_t, 3> a_strides, b_strides;

    const void* input = a_device_buf.GetDeviceBuffer();
    void* output      = b_device_buf.GetDeviceBuffer();

    std::copy(begin(shape), end(shape), begin(a_lengths));
    std::copy(begin(a.mDesc.GetStrides()), end(a.mDesc.GetStrides()), begin(a_strides));
    std::copy(begin(transposed_shape), end(transposed_shape), begin(b_lengths));
    std::copy(begin(b.mDesc.GetStrides()), end(b.mDesc.GetStrides()), begin(b_strides));

    static_assert(std::is_default_constructible_v<DevicePermuteInstance>);

    auto permute  = DevicePermuteInstance{};
    auto argument = permute.MakeArgument(
        a_lengths, a_strides, b_lengths, b_strides, input, output, PassThrough{});

    if(!permute.IsSupportedArgument(argument))
    {
        std::cerr << "The runtime parameters seems not supported by the device instance, exiting!"
                  << std::endl;
        return false;
    };

    auto invoker   = permute.MakeInvoker();
    float ave_time = invoker.Run(argument, StreamConfig{nullptr, config.time_kernel});

    std::cout << "Perf: " << ave_time << " ms" << std::endl;

    if(config.do_verification)
    {
        b_device_buf.FromDevice(data(b.mData));

#if NUM_ELEMS_IN_BUNDLE == 1
        Tensor<BDataType> host_b(transposed_shape);
        if(!host_permute(a, problem.axes, PassThrough{}, host_b))
        {
            return false;
        }

        return ck::utils::check_err(
            b.mData, host_b.mData, "Error: incorrect results in output tensor", 1e-10, 1e-10);
#else
        // extend tensor shape from [N, H, W] to [N, H, W, NUM_ELEMS_IN_BUNDLE]
        using DataType = detail::get_bundled_t<ADataType, NUM_ELEMS_IN_BUNDLE>;

        const auto extended_shape = extend_shape(shape, NUM_ELEMS_IN_BUNDLE);
        const auto extended_axes  = extend_axes(problem.axes);

        ck::remove_cvref_t<decltype(extended_shape)> transposed_extended_shape;
        transpose_shape(extended_shape, extended_axes, begin(transposed_extended_shape));

        Tensor<DataType> extended_a(extended_shape);
        std::memcpy(data(extended_a.mData),
                    data(a.mData),
                    sizeof(ADataType) * a.mDesc.GetElementSpaceSize());

        Tensor<DataType> extended_host_b(transposed_extended_shape);
        if(!host_permute(extended_a, extended_axes, PassThrough{}, extended_host_b))
        {
            return false;
        }

        return ck::utils::check_err(
            ck::span<const DataType>{reinterpret_cast<DataType*>(data(b.mData)),
                                     b.mDesc.GetElementSpaceSize() * NUM_ELEMS_IN_BUNDLE},
            ck::span<const DataType>{extended_host_b.mData},
            "Error: incorrect results in output tensor",
            1e-10,
            1e-10);
#endif
    }

    return true;
}

bool run_permute_example(int argc,
                         char* argv[],
                         const Problem::Shape& default_shape,
                         const Problem::Axes& default_axes)
{
    ExecutionConfig config;
    Problem problem(default_shape, default_axes);

    return parse_cmd_args(argc, argv, config, problem) && run_permute(config, problem);
}
