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from __future__ import annotations

from cutlass_cppgen.utils.lazy_import import lazy_import
cuda = lazy_import("cuda.cuda")
import numpy as np

from cutlass_cppgen.backend.memory_manager import device_mem_alloc, todevice
from cutlass_cppgen.utils.datatypes import is_cupy_tensor, is_numpy_tensor, is_torch_tensor


class NumpyFrontend:
    """
    Frontend node for numpy
    """

    @staticmethod
    def argument(np_tensor: "np.ndarray", is_output: "bool") -> cuda.CUdeviceptr:
        """Convert the input numpy tensor to CUDA device pointer

        :param np_tensor: input numpy nd array
        :param is_output: whether the tensor is output

        :return: CUDA device pointer
        """
        # copy the data to device
        if is_output:
            return device_mem_alloc(np_tensor.size * np_tensor.itemsize)
        else:
            return todevice(np_tensor)


class TorchFrontend:
    """
    Frontend node for torch
    """

    @staticmethod
    def argument(torch_tensor: "torch.Tensor") -> cuda.CUdeviceptr:
        """Convert the input torch tensor to CUDA device pointer

        :param torch_tensor: input torch tensor
        :param is_output: whether the tensor is output

        :return: CUDA device pointer
        """

        # check the device of torch_tensor
        if not torch_tensor.is_cuda:
            torch_tensor = torch_tensor.to("cuda")

        return cuda.CUdeviceptr(torch_tensor.data_ptr())


class CupyFrontend:
    """
    Frontend node for cupy
    """

    @staticmethod
    def argument(cupy_ndarray: "cp.ndarray"):
        return cuda.CUdeviceptr(int(cupy_ndarray.data.ptr))


class TensorFrontend:
    """
    Universal Frontend for client-provide tensors
    """

    @staticmethod
    def argument(tensor, is_output=False):
        if is_numpy_tensor(tensor):
            return NumpyFrontend.argument(tensor, is_output)
        elif is_torch_tensor(tensor):
            return TorchFrontend.argument(tensor)
        elif is_cupy_tensor(tensor):
            return CupyFrontend.argument(tensor)
        else:
            raise NotImplementedError("Unknown Tensor Type")