from psycopg2.extensions import adapt, new_type, register_adapter, register_type
from ..utils import HalfVector


class HalfvecAdapter:
    def __init__(self, value):
        self._value = value

    def getquoted(self):
        return adapt(HalfVector._to_db(self._value)).getquoted()


def cast_halfvec(value, cur):
    return HalfVector._from_db(value)


def register_halfvec_info(oid, scope):
    halfvec = new_type((oid,), 'HALFVEC', cast_halfvec)
    register_type(halfvec, scope)
    register_adapter(HalfVector, HalfvecAdapter)