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#   http://www.apache.org/licenses/LICENSE-2.0
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"""Function defintiions."""
from enum import IntEnum
import tvm.runtime

from .expr import RelayExpr
from . import _ffi_api


class CallingConv(IntEnum):
    """Possible kinds of calling conventions."""

    DEFAULT = 0
    C_PACKED_FUNC = 1
    DEVICE_KERNEL_LAUNCH = 2


class BaseFunc(RelayExpr):
    """Base class of all functions."""

    @property
    def attrs(self):
        """Return the attrs member of the function."""
        return _ffi_api.BaseFunc_Attrs(self)

    def with_attr(self, attr_key_or_dict, attr_value=None):
        """Create a new copy of the function and update the attribute.

        Parameters
        ----------
        attr_key_or_dict : Union[str, dict]
            The attribute key to use or a dict containing multiple key value pairs.

        attr_value : Object
            The new attribute value.

        Returns
        -------
        func : Function
            A new copy of the function
        """
        # make sure we first copy so that we can safely do copy on write
        # for multiple updates.
        res = _ffi_api.BaseFuncCopy(self)

        if isinstance(attr_key_or_dict, dict):
            for key, val in attr_key_or_dict.items():
                res = _ffi_api.BaseFuncWithAttr(res._move(), key, tvm.runtime.convert(val))
            return res

        return _ffi_api.BaseFuncWithAttr(
            res._move(), attr_key_or_dict, tvm.runtime.convert(attr_value)
        )