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

#pragma once

#include "ck_tile/ops/gemm/pipeline/gemm_universal_pipeline_ag_bg_cr_policy.hpp"
#include "gemm_group_quant_utils.hpp"

namespace ck_tile {

struct GemmBQuantPipelineAgBgCrDefaultPolicy : public UniversalGemmPipelineAgBgCrPolicy
{
    using Base = UniversalGemmPipelineAgBgCrPolicy;
    using Base::I0;
    using Base::I1;
    using Base::I2;

    template <typename Problem>
    CK_TILE_HOST_DEVICE static constexpr auto GetVectorSizeBQ()
    {
        using BQLayout                = remove_cvref_t<typename Problem::BQLayout>;
        using BQDataType              = remove_cvref_t<typename Problem::BQDataType>;
        constexpr index_t NPerBlock   = Problem::BlockGemmShape::kN;
        constexpr index_t KPerBlock   = Problem::BlockGemmShape::kK;
        constexpr index_t KPerBlockBQ = KPerBlock / Problem::kQuantGroupSize;

        static_assert(std::is_same_v<BQLayout, ck_tile::tensor_layout::gemm::ColumnMajor>);
        return GetABQGlobalVectorLoadSize<Problem, BQDataType, NPerBlock, KPerBlockBQ>();
    }

    template <typename Problem>
    CK_TILE_HOST_DEVICE static constexpr auto MakeBQDramTileDistribution()
    {
        using BQLayout       = remove_cvref_t<typename Problem::BQLayout>;
        using BlockGemmShape = typename Problem::BlockGemmShape;

        constexpr index_t BlockSize   = Problem::kBlockSize;
        constexpr index_t NPerBlock   = Problem::BlockGemmShape::kN;
        constexpr index_t KPerBlock   = Problem::BlockGemmShape::kK;
        constexpr index_t KPerBlockBQ = KPerBlock / Problem::kQuantGroupSize;
        constexpr index_t VecLoadSize = GetVectorSizeBQ<Problem>();
        using WarpTile                = typename Problem::BlockGemmShape::WarpTile;
        using WarpGemm                = WarpGemmDispatcher<typename Problem::ComputeDataType,
                                                           typename Problem::ComputeDataType,
                                                           typename Problem::CDataType,
                                                           WarpTile::at(I0),
                                                           WarpTile::at(I1),
                                                           WarpTile::at(I2),
                                                           Problem::TransposeC>;

        static_assert(std::is_same_v<BQLayout, tensor_layout::gemm::ColumnMajor>);
        using TileEncodingPattern = tile_distribution_encoding_pattern_bq<BlockGemmShape,
                                                                          WarpGemm,
                                                                          BlockSize,
                                                                          NPerBlock,
                                                                          KPerBlockBQ,
                                                                          VecLoadSize>;

        return TileEncodingPattern::make_2d_static_tile_distribution();
    }

    template <typename Problem>
    CK_TILE_HOST_DEVICE static constexpr auto GetBlockGemm()
    {
        using BlockWarps = typename Problem::BlockGemmShape::BlockWarps;
        using WarpTile   = typename Problem::BlockGemmShape::WarpTile;

        static_assert(Problem::kQuantGroupSize % WarpTile::at(I2) == 0,
                      "KPerWarpGemm must be a multiple of kQuantGroupSize!");

        using WarpGemm = WarpGemmDispatcher<typename Problem::ComputeDataType,
                                            typename Problem::ComputeDataType,
                                            typename Problem::CDataType,
                                            WarpTile::at(I0),
                                            WarpTile::at(I1),
                                            WarpTile::at(I2),
                                            Problem::TransposeC>;
        static_assert(std::is_same_v<typename Problem::ComputeDataType, fp8_t> ||
                      std::is_same_v<typename Problem::ComputeDataType, bf8_t>);
        static_assert(std::is_same_v<typename Problem::CDataType, float>);
        using BlockGemmPolicy = BlockGemmASmemBSmemCRegV1CustomPolicy<typename Problem::ADataType,
                                                                      typename Problem::BDataType,
                                                                      typename Problem::CDataType,
                                                                      BlockWarps,
                                                                      WarpGemm>;
        return BQuantBlockUniversalGemmAsBsCr<Problem, BlockGemmPolicy>{};
    }
};

} // namespace ck_tile
