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from numba.core.imputils import lower_constant
from numba.core import cgutils

from .types import SeriesType


@lower_constant(SeriesType)
def constant_Series(context, builder, ty, pyval):
    """
    Create a constant Series.

    See @unbox(SeriesType)
    """
    series = cgutils.create_struct_proxy(ty)(context, builder)
    series.data = _constant_Series_data(context, builder, ty, pyval)
    # TODO: index and name
    return series._getvalue()


def _constant_Series_data(context, builder, ty, pyval):
    """
    Create a constant for Series data.

    Mostly reuses constant creation for pandas arrays.
    """

    from ..categorical.types import CategoricalDtypeType

    if isinstance(ty.dtype, CategoricalDtypeType):
        from ..categorical.boxing import constant_Categorical
        return constant_Categorical(context, builder, ty.data, pyval.array)

    raise NotImplementedError()
