// SPDX-FileCopyrightText: Copyright 2025 Arm Limited and/or its affiliates <open-source-office@arm.com>
// SPDX-License-Identifier: MIT
//

#pragma once

#include <functional>
#include <variant>
#include "ggml.h"

enum cpu_feature {
    CPU_FEATURE_NONE    = 0,
    CPU_FEATURE_DOTPROD = 1,
    CPU_FEATURE_I8MM    = 2,
    CPU_FEATURE_SVE     = 4,
    CPU_FEATURE_SME     = 8
};
inline cpu_feature& operator|=(cpu_feature& lhs, cpu_feature rhs) {
    lhs = static_cast<cpu_feature>(lhs | rhs);
    return lhs;
}
inline cpu_feature operator|(cpu_feature lhs, cpu_feature rhs) {
    return static_cast<cpu_feature>(static_cast<int>(lhs) | static_cast<int>(rhs));
}

struct kernel_info {
    size_t (*get_m_step)(void);
    size_t (*get_n_step)(void);
    size_t (*get_mr)(void);
    size_t (*get_nr)(void);
    size_t (*get_kr)(void);
    size_t (*get_sr)(void);
    std::variant<
        std::function<size_t(size_t n_idx, size_t k, size_t bl)>,
        std::function<size_t(size_t m_idx, size_t k)>
    > get_lhs_offset;
    std::variant<
        std::function<size_t(size_t n_idx, size_t k, size_t bl)>,
        std::function<size_t(size_t n_idx, size_t k)>
    > get_rhs_packed_offset;
    size_t (*get_dst_offset)(size_t m_idx, size_t n_idx, size_t stride);
    size_t (*get_dst_size)(size_t m, size_t n);
    std::variant<
        std::function<void(size_t m, size_t n, size_t k, size_t bl, const void* lhs_packed, const void* rhs_packed,
            float* dst, size_t dst_stride_row, size_t dst_stride_col, float scalar_min, float scalar_max)>,
        std::function<void(size_t m, size_t n, size_t k, const void* lhs_packed, const void* rhs_packed, void* dst, size_t dst_stride_row,
            size_t dst_stride_col, float clamp_min, float clamp_max)>
    > run_kernel;
};

struct lhs_packing_info {
    size_t (*get_offset)(size_t m_idx, size_t lhs_stride);
    std::variant<
        std::function<size_t(size_t m_idx, size_t k, size_t bl, size_t mr, size_t kr, size_t sr)>,
        std::function<size_t(size_t m_idx, size_t k, size_t mr, size_t kr, size_t sr)>
    > get_packed_offset;
    std::variant<
        std::function<size_t(size_t m_idx, size_t k, size_t bl, size_t mr, size_t kr, size_t sr)>,
        std::function<size_t(size_t m, size_t k, size_t mr, size_t kr, size_t sr)>
    > packed_size;
    std::variant<
        std::function<void(size_t m, size_t k, size_t bl, size_t mr, size_t kr, size_t sr, size_t m_idx_start, const float* lhs,
            size_t lhs_stride, void* lhs_packed)>,
        std::function<void(size_t m, size_t k, size_t mr, size_t kr, size_t sr, size_t m_idx_start, const void* lhs, size_t lhs_stride,
        void* lhs_packed)>
    > pack_func;
};

struct rhs_packing_info {
    std::variant<
        std::function<size_t(size_t n, size_t k, size_t nr, size_t kr, size_t bl)>,
        std::function<size_t(size_t n, size_t k)>
    > packed_size;
    size_t (*packed_stride)(size_t k, size_t nr, size_t kr, size_t bl);
    std::variant<
        std::function<void(size_t num_groups, size_t n, size_t k, size_t nr, size_t kr, size_t sr, size_t bl, const uint8_t* rhs,
            const float* bias, void* rhs_packed, size_t extra_bytes, const struct kai_rhs_pack_qs4cxs1s0_param* params)>,
        std::function<void(size_t num_groups, size_t n, size_t k, size_t nr, size_t kr, size_t sr, size_t rhs_stride, const void* rhs,
            const void* bias, const void* scale, void* rhs_packed, size_t extra_bytes, const void* params)>
    > pack_func;
    void (*to_float)(const void *packed_data, int32_t row_idx, int64_t nc, float *out, size_t nr_pack, size_t packed_row_stride,
          size_t kr, size_t bl, size_t num_bytes_multiplier);
};

struct ggml_kleidiai_kernels {
    kernel_info gemm;
    kernel_info gemv;
    lhs_packing_info lhs_info;
    rhs_packing_info rhs_info;

    cpu_feature required_cpu;
    ggml_type lhs_type;
    ggml_type rhs_type;
    ggml_type op_type;
};

ggml_kleidiai_kernels * ggml_kleidiai_select_kernels(cpu_feature cpu_features, const ggml_tensor * tensor);
ggml_kleidiai_kernels * ggml_kleidiai_select_kernels_q4_0(cpu_feature features);