#pragma once

#include "ck_tile/core.hpp"
#include "ck_tile/ops/common.hpp"

namespace ck_tile {
    
template <typename Pipeline_>
struct PerTensorQuant
{
    using Pipeline = remove_cvref_t<Pipeline_>;
    using Problem  = typename Pipeline::Problem;

    using XDataType           = remove_cvref_t<typename Problem::XDataType>;
    using ScaleDataType       = remove_cvref_t<typename Problem::ScaleDataType>;
    using ComputeDataType     = remove_cvref_t<typename Problem::ComputeDataType>;
    using QXDataType          = remove_cvref_t<typename Problem::QXDataType>;

    static constexpr index_t Block_M = Problem::BlockShape::Block_M;
    static constexpr index_t Block_N = Problem::BlockShape::Block_N;
    static constexpr bool kPadM      = false; // always no need to pad along M
    static constexpr bool kPadN      = Problem::kPadN;

    static constexpr index_t ThreadPerWarp_N = Problem::BlockShape::ThreadPerWarp_N;
    static constexpr index_t Vector_N        = Problem::BlockShape::Vector_N;
    static constexpr index_t Repeat_N        = Problem::BlockShape::Repeat_N;

    struct Kargs
    {
        const void* p_x;
        void* p_scale;
        void* p_qx;

        index_t m;
        index_t n;
        index_t x_stride; // input row_stride
    };

    CK_TILE_HOST static constexpr Kargs MakeKargs(const Kargs& kargs)
    {
        return kargs;
    }

    CK_TILE_HOST static constexpr auto GridSize(const Kargs& kargs)
    {
        return dim3(integer_divide_ceil(kargs.m, Block_M));
    }

    CK_TILE_HOST static constexpr auto BlockSize() { return Problem::BlockShape::BlockSize; }

    // clang-format off
    template <typename T> struct t2s;
    template <> struct t2s<float> { static constexpr const char * name = "fp32"; };
    template <> struct t2s<ck_tile::fp16_t> { static constexpr const char * name = "fp16"; };
    template <> struct t2s<ck_tile::bf16_t> { static constexpr const char * name = "bf16"; };
    template <> struct t2s<ck_tile::fp8_t> { static constexpr const char * name = "fp8"; };
    template <> struct t2s<ck_tile::bf8_t> { static constexpr const char * name = "bf8"; };
    // clang-format on

    // in byte
    CK_TILE_HOST_DEVICE static constexpr index_t GetSmemSize() { return Pipeline::GetSmemSize(); }

    CK_TILE_HOST static std::string GetName()
    {
        // clang-format off
        using S_ = typename Problem::BlockShape;
        auto surfix = [&] () {
            std::string n;
            if (kPadN) n += "_pn";
            return n; }();

        #define _SS_  std::string
        #define _TS_  std::to_string
        return _SS_("quant_fwd_") + _SS_(t2s<XDataType>::name) + "_" +
             _TS_(S_::Block_M) + "x" + _TS_(S_::Block_N) + "_" + _TS_(S_::WarpPerBlock_M) + "x" + _TS_(S_::WarpPerBlock_N) + "_" +
             _TS_(S_::Warp_M) + "x" + _TS_(S_::Warp_N) + "_" + _TS_(S_::Vector_M) + "x" + _TS_(S_::Vector_N) + "_" +
             _SS_(Pipeline::name) + surfix;
        #undef _SS_
        #undef _TS_
        // clang-format on
    }

    CK_TILE_DEVICE void operator()(Kargs kargs) const
    {
        const auto iM = get_block_id() * Block_M;

        const auto x_window = [&]() {
            const auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                static_cast<const XDataType*>(kargs.p_x),
                make_tuple(kargs.m, kargs.n),
                make_tuple(kargs.x_stride, 1),
                number<Vector_N>{},
                number<1>{});

            const auto tmp2_ = pad_tensor_view(
                tmp_, make_tuple(number<Block_M>{}, number<Block_N>{}), sequence<kPadM, kPadN>{});
            return make_tile_window(
                tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
        }();

        auto qx_window = [&]() {
            auto tmp_ = make_naive_tensor_view<address_space_enum::global>(
                static_cast<QXDataType*>(kargs.p_qx),
                make_tuple(kargs.m, kargs.n),
                make_tuple(kargs.x_stride, 1),
                number<Vector_N>{},
                number<1>{});

            auto tmp2_ = pad_tensor_view(
                tmp_, make_tuple(number<Block_M>{}, number<Block_N>{}), sequence<kPadM, kPadN>{});
            return make_tile_window(
                tmp2_, make_tuple(number<Block_M>{}, number<Block_N>{}), {iM, 0});
        }();
        __shared__ char smem[GetSmemSize()];
        ScaleDataType* scale = static_cast<ScaleDataType*>(kargs.p_scale);
        Pipeline{}(x_window, scale, kargs.n, qx_window, smem);
    }
};
} // namespace ck_tile