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import pandas

from numba import types
from numba.core import cgutils
from numba.extending import (models, overload, register_model, make_attribute_wrapper, intrinsic)
from numba.core.datamodel import (register_default, StructModel)
from numba.core.typing.templates import signature
from sdc.hiframes.pd_series_type import SeriesType


class SeriesGetitemAccessorType(types.Type):
    def __init__(self, series, accessor):
        self.series = series
        self.accessor = accessor
        super(SeriesGetitemAccessorType, self).__init__('SeriesGetitemAccessorType({}, {})\
            '.format(series, accessor))


@register_model(SeriesGetitemAccessorType)
class SeriesGetitemAccessorTypeModel(StructModel):
    def __init__(self, dmm, fe_type):
        members = [
            ('series', fe_type.series),
        ]
        models.StructModel.__init__(self, dmm, fe_type, members)


make_attribute_wrapper(SeriesGetitemAccessorType, 'series', '_series')


@intrinsic
def series_getitem_accessor_init(typingctx, series, accessor):

    if not (isinstance(series, SeriesType)
            and isinstance(accessor, types.StringLiteral)):
        return None, None

    def series_getitem_accessor_init_codegen(context, builder, signature, args):
        series_val, accessor_val = args
        getitem_accessor = cgutils.create_struct_proxy(
            signature.return_type)(context, builder)
        getitem_accessor.series = series_val

        if context.enable_nrt:
            context.nrt.incref(builder, signature.args[0], series_val)

        return getitem_accessor._getvalue()

    ret_typ = SeriesGetitemAccessorType(series, accessor)
    sig = signature(ret_typ, series, accessor)

    return sig, series_getitem_accessor_init_codegen
