import torch
from torch._inductor.codegen.rocm.rocm_template import ROCmTemplate
from torch._inductor.ir import IRNode
from torch._inductor.utils import IndentedBuffer


class CKTemplate(ROCmTemplate):
    """
    Base class for generating CK templates, has common, i.e. non-gemm-specific, code generation logic
    """

    _TORCH_DTYPE_TO_CK = {
        torch.float32: "F32",
        torch.float64: "F64",
        torch.float16: "F16",
        torch.bfloat16: "BF16",
        torch.int32: "I32",
        torch.int8: "I8",
        torch.float8_e4m3fnuz: "F8",
        torch.float8_e5m2fnuz: "BF8",
    }

    def header(self) -> IndentedBuffer:
        res = super().header()
        res.splice(
            """
                // CK headers

                #ifdef DEBUG_LOG
                #define DEBUG_LOG_TMP DEBUG_LOG
                #undef DEBUG_LOG
                #else
                #define DEBUG_LOG_TMP 0
                #endif
                #include "ck/ck.hpp"
                #undef DEBUG_LOG
                #define DEBUG_LOG DEBUG_LOG_TMP

                #include "ck/utility/data_type.hpp"
                #include "ck/library/utility/check_err.hpp"
                #include "ck/library/utility/device_memory.hpp"
                #include "ck/library/utility/fill.hpp"
                #include "ck/library/utility/host_tensor.hpp"
                #include "ck/library/utility/host_tensor_generator.hpp"
                #include "ck/library/utility/literals.hpp"
            """
        )
        return res

    def globals(self) -> IndentedBuffer:
        res = super().globals()
        res.splice(
            """
                // CK globals

                template <ck::index_t... Is>
                using S = ck::Sequence<Is...>;

                template<typename... Ts>
                using Tuple = ck::Tuple<Ts...>;

                using PassThrough = ck::tensor_operation::element_wise::PassThrough;
                using Bilinear = ck::tensor_operation::element_wise::Bilinear;
                using Scale = ck::tensor_operation::element_wise::Scale;
                using ScaleAdd = ck::tensor_operation::element_wise::ScaleAdd;
                using MultiplyMultiply = ck::tensor_operation::element_wise::MultiplyMultiply;

                // see "composable_kernel/include/ck/utility/data_type.hpp"
                using F8  = ck::f8_t;
                using BF8 = ck::bf8_t;
                using F16 = ck::half_t;
                using F32 = float;
                // using F64 = double;
                using BF16 = ck::bhalf_t;
                // using I32 = int32_t;
                // using I8 = int8_t;
                // using I4 = ck::int4_t;

                #if DEBUG_LOG
                static constexpr auto kDEBUG_LOG = 1;
                #else
                static constexpr auto kDEBUG_LOG = 0;
                #endif
            """
        )
        return res

    def torch_type_to_ck(self, node: IRNode, ptr: str) -> str:
        if node is None:
            return ptr
        else:
            return f"({self._TORCH_DTYPE_TO_CK.get(node.get_dtype())}*)({ptr})"
