# -*- coding: utf-8 -*-
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from numba import types
from numba.extending import (
    models,
    register_model,
    make_attribute_wrapper
)


class EmptyIndexType(types.Type):

    # this index represents special case of pd.Index([]) with dtype='object'
    # for overload typing functions assume it has following dtype
    dtype = types.pyobject

    def __init__(self, is_named=False):
        self.is_named = is_named
        super(EmptyIndexType, self).__init__(
            name='EmptyIndexType({})'.format(is_named))


@register_model(EmptyIndexType)
class EmptyIndexModel(models.StructModel):
    def __init__(self, dmm, fe_type):

        name_type = types.unicode_type if fe_type.is_named else types.none
        members = [
            ('name', name_type),
        ]
        models.StructModel.__init__(self, dmm, fe_type, members)


# FIXME_Numba#3372: add into numba.types to allow returning from objmode
types.EmptyIndexType = EmptyIndexType


make_attribute_wrapper(EmptyIndexType, 'name', '_name')
