// SPDX-License-Identifier: MIT
// Copyright (c) 2024-2025, Advanced Micro Devices, Inc. All rights reserved.
#pragma once

#include <sstream>
#include <gtest/gtest.h>

#include "ck_tile/core.hpp"
#include "ck_tile/host.hpp"
#include "ck_tile/host/kernel_launch.hpp"
#include "ck_tile/ops/epilogue.hpp"
#include "ck_tile/ops/gemm.hpp"

template <typename ADataType, typename BDataType, typename AccDataType, typename CDataType>
auto calculate_rtol_atol(const ck_tile::index_t K,
                         const ck_tile::index_t kbatch,
                         const float max_accumulated_value)
{
    using ComputeType =
        std::conditional_t<sizeof(ADataType) < sizeof(BDataType), ADataType, BDataType>;
    // Calculate thresholds
    const auto rtol = ck_tile::get_relative_threshold<ComputeType, CDataType, AccDataType>(
        ck_tile::integer_divide_ceil(K, kbatch));
    const auto atol = ck_tile::get_absolute_threshold<ComputeType, CDataType, AccDataType>(
        max_accumulated_value / kbatch, ck_tile::integer_divide_ceil(K, kbatch));
    // Calculate error due to split_k accumulation
    const auto rtol_split_k =
        ck_tile::get_relative_threshold<CDataType, CDataType, CDataType>(kbatch);
    const auto atol_split_k = ck_tile::get_absolute_threshold<CDataType, CDataType, CDataType>(
        max_accumulated_value, kbatch);
    // Use higher threshold
    return ck_tile::make_tuple(std::max(rtol, rtol_split_k), std::max(atol, atol_split_k));
}

enum struct GemmPipelineType
{
    Mem,
    CompV3,
    CompV4
};

template <GemmPipelineType PT, typename Problem>
struct GemmPipelineTypeSelector;

template <typename Problem>
struct GemmPipelineTypeSelector<GemmPipelineType::Mem, Problem>
{
    using base_pipeline = ck_tile::BaseGemmPipelineAgBgCrMem<Problem>;
    using pipeline      = ck_tile::GemmPipelineAgBgCrMem<Problem>;

    static constexpr auto GetName() { return "GemmPipelineAgBgCrMem"; }
};

template <typename Problem>
struct GemmPipelineTypeSelector<GemmPipelineType::CompV3, Problem>
{
    using base_pipeline = ck_tile::BaseGemmPipelineAgBgCrCompV3<Problem>;
    using pipeline      = ck_tile::GemmPipelineAgBgCrCompV3<Problem>;

    static constexpr auto GetName() { return "GemmPipelineAgBgCrCompV3"; }
};

template <typename Problem>
struct GemmPipelineTypeSelector<GemmPipelineType::CompV4, Problem>
{
    using base_pipeline = ck_tile::BaseGemmPipelineAgBgCrCompV4<Problem>;
    using pipeline      = ck_tile::GemmPipelineAgBgCrCompV4<Problem>;

    static constexpr auto GetName() { return "GemmPipelineAgBgCrCompV4"; }
};

template <typename Tuple>
class TestCkTileGemmPipeline : public ::testing::Test
{
    protected:
    using ALayout                      = std::tuple_element_t<0, Tuple>;
    using BLayout                      = std::tuple_element_t<1, Tuple>;
    using CLayout                      = std::tuple_element_t<2, Tuple>;
    using ADataType                    = std::tuple_element_t<3, Tuple>;
    using BDataType                    = std::tuple_element_t<4, Tuple>;
    using AccDataType                  = std::tuple_element_t<5, Tuple>;
    using CDataType                    = std::tuple_element_t<6, Tuple>;
    static constexpr auto Scheduler    = std::tuple_element_t<7, Tuple>::value;
    static constexpr auto PipelineType = std::tuple_element_t<8, Tuple>::value;

    using DsLayout   = ck_tile::tuple<>;
    using DsDataType = ck_tile::tuple<>;

    static constexpr bool Persistent =
        ck_tile::tuple_element_or_default_t<Tuple, 9, std::false_type>::value;
    // TODO: expose tile size through test t-param ?

    template <bool PadM, bool PadN, bool PadK>
    void invoke_gemm(const ck_tile::GemmHostArgs</*NumDTensor = 0*/>& args,
                     const ck_tile::stream_config& s)
    {
        // TODO: This should be parameterized in tests
        constexpr ck_tile::index_t M_Tile = 256;
        constexpr ck_tile::index_t N_Tile = 256;
        constexpr ck_tile::index_t K_Tile = (PipelineType == GemmPipelineType::CompV4) ? 32 : 64;

        constexpr ck_tile::index_t M_Warp = 2;
        constexpr ck_tile::index_t N_Warp = 2;
        constexpr ck_tile::index_t K_Warp = 1;

        constexpr ck_tile::index_t M_Warp_Tile = 32;
        constexpr ck_tile::index_t N_Warp_Tile = 32;
        constexpr ck_tile::index_t K_Warp_Tile = 16;

        constexpr bool kPadM = PadM;
        constexpr bool kPadN = PadN;
        constexpr bool kPadK = PadK;

        constexpr bool DoubleSmemBuffer = (PipelineType == GemmPipelineType::CompV4) ? true : false;

        // TODO: For now - but this should also be a test parameter
        constexpr bool TransposeC = false;

        constexpr int kBlockPerCu                         = 1;
        constexpr ck_tile::index_t TileParitionerGroupNum = 8;
        constexpr ck_tile::index_t TileParitionerM01      = 4;

        // ===============================================

        using GemmShape =
            ck_tile::TileGemmShape<ck_tile::sequence<M_Tile, N_Tile, K_Tile>,
                                   ck_tile::sequence<M_Warp, N_Warp, K_Warp>,
                                   ck_tile::sequence<M_Warp_Tile, N_Warp_Tile, K_Warp_Tile>>;
        using TilePartitioner = ck_tile::
            GemmSpatiallyLocalTilePartitioner<GemmShape, TileParitionerGroupNum, TileParitionerM01>;

        using Traits = ck_tile::TileGemmTraits<kPadM, kPadN, kPadK, ALayout, BLayout, CLayout>;
        static constexpr bool StructuredSparsity = false;
        using GemmUniversalTraits                = ck_tile::TileGemmUniversalTraits<kPadM,
                                                                     kPadN,
                                                                     kPadK,
                                                                     DoubleSmemBuffer,
                                                                     ALayout,
                                                                     BLayout,
                                                                     CLayout,
                                                                     TransposeC,
                                                                     StructuredSparsity,
                                                                     Persistent>;

        using GemmPipelineProblem =
            ck_tile::GemmPipelineProblem<ADataType, BDataType, AccDataType, GemmShape, Traits>;

        using BaseGemmPipeline =
            typename GemmPipelineTypeSelector<PipelineType, GemmPipelineProblem>::base_pipeline;

        const ck_tile::index_t k_grain     = args.k_batch * K_Tile;
        const ck_tile::index_t K_split     = (args.K + k_grain - 1) / k_grain * K_Tile;
        const ck_tile::index_t num_loop    = TilePartitioner::GetLoopNum(K_split);
        const bool has_hot_loop            = BaseGemmPipeline::BlockHasHotloop(num_loop);
        const ck_tile::TailNumber tail_num = BaseGemmPipeline::GetBlockLoopTailNum(num_loop);

        const auto Run = [&](const auto has_hot_loop_,
                             const auto tail_number_,
                             const auto memory_operation_) {
            constexpr bool has_hot_loop_v   = has_hot_loop_.value;
            constexpr auto tail_number_v    = tail_number_.value;
            constexpr auto memory_operation = memory_operation_.value;

            using UniversalGemmProblem = ck_tile::UniversalGemmPipelineProblem<ADataType,
                                                                               BDataType,
                                                                               AccDataType,
                                                                               GemmShape,
                                                                               GemmUniversalTraits,
                                                                               Scheduler,
                                                                               has_hot_loop_v,
                                                                               tail_number_v>;

            using GemmPipeline =
                typename GemmPipelineTypeSelector<PipelineType, UniversalGemmProblem>::pipeline;

            using GemmEpilogue = ck_tile::CShuffleEpilogue<
                ck_tile::CShuffleEpilogueProblem<ADataType,
                                                 BDataType,
                                                 DsDataType,
                                                 AccDataType,
                                                 CDataType,
                                                 DsLayout,
                                                 CLayout,
                                                 ck_tile::element_wise::PassThrough,
                                                 GemmPipeline::BlockSize,
                                                 TilePartitioner::MPerBlock,
                                                 TilePartitioner::NPerBlock,
                                                 M_Warp,
                                                 N_Warp,
                                                 M_Warp_Tile,
                                                 N_Warp_Tile,
                                                 K_Warp_Tile,
                                                 UniversalGemmProblem::TransposeC,
                                                 memory_operation>>;

            using Kernel = ck_tile::GemmKernel<TilePartitioner, GemmPipeline, GemmEpilogue>;
            auto kargs   = Kernel::MakeKernelArgs(args);

            dim3 grids;
            if constexpr(Persistent)
            {
                grids = Kernel::MaxOccupancyGridSize(s);
            }
            else
            {
                grids = Kernel::GridSize(args.M, args.N, args.k_batch);
            }
            constexpr dim3 blocks = Kernel::BlockSize();

            if(!Kernel::IsSupportedArgument(kargs))
            {
                throw std::runtime_error("Wrong! Arguments not supported! Skipping gemm!\n");
            }

            if(s.log_level_ > 0)
            {
                std::cout << "Launching kernel with args:"
                          << " grid: {" << grids.x << ", " << grids.y << ", " << grids.z << "}"
                          << ", blocks: {" << blocks.x << ", " << blocks.y << ", " << blocks.z
                          << "}" << std::endl;
            }

            ck_tile::launch_kernel(
                s, ck_tile::make_kernel<blocks.x, kBlockPerCu>(Kernel{}, grids, blocks, 0, kargs));
        };

        const auto RunSplitk = [&](const auto has_hot_loop_, const auto tail_number_) {
            if(args.k_batch == 1)
            {
                Run(has_hot_loop_,
                    tail_number_,
                    ck_tile::integral_constant<ck_tile::memory_operation_enum,
                                               ck_tile::memory_operation_enum::set>{});
            }
            else
            {
                Run(has_hot_loop_,
                    tail_number_,
                    ck_tile::integral_constant<ck_tile::memory_operation_enum,
                                               ck_tile::memory_operation_enum::atomic_add>{});
            }
        };

        BaseGemmPipeline::TailHandler(RunSplitk, has_hot_loop, tail_num);
    }

    public:
    std::vector<int> k_batches_;

    void SetUp() override
    {
        if constexpr(PipelineType == GemmPipelineType::CompV4)
        {
            // Only do k_batch = 1 when pipeline is CompV4
            k_batches_ = {1};
        }
        else
        {
            // Otherwise, use k_batch = 1 and 2
            k_batches_ = {1, 2};
        }
    }

    template <bool PadM = true, bool PadN = true, bool PadK = true>
    void Run(const int M,
             const int N,
             const int K,
             const int StrideA = 0,
             const int StrideB = 0,
             const int StrideC = 0)
    {
        for(auto kb : k_batches_)
        {
            RunSingle<PadM, PadN, PadK>(M, N, K, StrideA, StrideB, StrideC, kb);
        }
    }

    template <bool PadM, bool PadN, bool PadK>
    void RunSingle(const int M,
                   const int N,
                   const int K,
                   const int StrideA,
                   const int StrideB,
                   const int StrideC,
                   int kbatch = 1)
    {
        using namespace ck_tile::literals;

        auto f_host_tensor_descriptor = [](std::size_t row,
                                           std::size_t col,
                                           std::size_t stride,
                                           auto layout) {
            if constexpr(std::is_same_v<decltype(layout), ck_tile::tensor_layout::gemm::RowMajor>)
            {
                return ck_tile::HostTensorDescriptor({row, col}, {stride, 1_uz});
            }
            else
            {
                return ck_tile::HostTensorDescriptor({row, col}, {1_uz, stride});
            }
        };

        auto f_get_default_stride =
            [](std::size_t row, std::size_t col, std::size_t stride, auto layout) {
                if(stride == 0)
                {
                    // give a chance if stride is zero, return a default packed stride
                    if constexpr(std::is_same_v<decltype(layout),
                                                ck_tile::tensor_layout::gemm::RowMajor>)
                    {
                        return col;
                    }
                    else
                    {
                        return row;
                    }
                }
                else
                    return stride;
            };

        std::size_t stride_A = f_get_default_stride(M, K, StrideA, ALayout{});
        std::size_t stride_B = f_get_default_stride(K, N, StrideB, BLayout{});
        std::size_t stride_C = f_get_default_stride(M, N, StrideC, CLayout{});

        ck_tile::HostTensor<ADataType> a_m_k(f_host_tensor_descriptor(M, K, stride_A, ALayout{}));
        ck_tile::HostTensor<BDataType> b_k_n(f_host_tensor_descriptor(K, N, stride_B, BLayout{}));
        ck_tile::HostTensor<CDataType> c_m_n_dev_result(
            f_host_tensor_descriptor(M, N, stride_C, CLayout{}));

        ck_tile::FillUniformDistributionIntegerValue<ADataType>{-5, 5}(a_m_k);
        ck_tile::FillUniformDistributionIntegerValue<BDataType>{-5, 5}(b_k_n);

        ck_tile::DeviceMem a_m_k_dev_buf(a_m_k.get_element_space_size_in_bytes());
        ck_tile::DeviceMem b_k_n_dev_buf(b_k_n.get_element_space_size_in_bytes());
        ck_tile::DeviceMem c_m_n_dev_buf(c_m_n_dev_result.get_element_space_size_in_bytes());

        a_m_k_dev_buf.ToDevice(a_m_k.data());
        b_k_n_dev_buf.ToDevice(b_k_n.data());
        c_m_n_dev_buf.SetZero();
        c_m_n_dev_result.SetZero();

        ck_tile::GemmHostArgs</*NumDTensor = 0*/> args;
        args.a_ptr    = a_m_k_dev_buf.GetDeviceBuffer();
        args.b_ptr    = b_k_n_dev_buf.GetDeviceBuffer();
        args.e_ptr    = c_m_n_dev_buf.GetDeviceBuffer();
        args.k_batch  = kbatch;
        args.M        = M;
        args.N        = N;
        args.K        = K;
        args.stride_A = stride_A;
        args.stride_B = stride_B;
        args.stride_E = stride_C;

        invoke_gemm<PadM, PadN, PadK>(args, ck_tile::stream_config{nullptr, false});

        c_m_n_dev_buf.FromDevice(c_m_n_dev_result.data());
        bool pass = true;

        ck_tile::HostTensor<CDataType> c_m_n_host_ref(
            f_host_tensor_descriptor(M, N, stride_C, CLayout{}));
        c_m_n_host_ref.SetZero();

        ck_tile::reference_gemm<ADataType, BDataType, AccDataType, CDataType>(
            a_m_k, b_k_n, c_m_n_host_ref);

        const float max_accumulated_value =
            *std::max_element(c_m_n_host_ref.mData.begin(), c_m_n_host_ref.mData.end());
        const auto rtol_atol = calculate_rtol_atol<ADataType, BDataType, AccDataType, CDataType>(
            K, kbatch, max_accumulated_value);
        pass = ck_tile::check_err(c_m_n_dev_result,
                                  c_m_n_host_ref,
                                  "Error: Incorrect results!",
                                  rtol_atol.at(ck_tile::number<0>{}),
                                  rtol_atol.at(ck_tile::number<1>{}));
        EXPECT_TRUE(pass);
    }
};
