from sqlalchemy import Integer
from sqlalchemy.dialects.mysql import BIT
from sqlalchemy.types import TypeDecorator


__all__ = ["BooleanBit", "IntEnum"]


class BooleanBit(TypeDecorator):
    impl = BIT
    cache_ok = True

    def __init__(self, *args, **kwargs):
        super().__init__(length=1)

    def process_bind_param(self, value, dialect):
        if value is None:
            return None

        return int(value)

    def process_result_value(self, value, dialect):
        if value is None:
            return None

        return bool(value)


class IntEnum(TypeDecorator):
    impl = Integer
    cache_ok = True

    def __init__(self, enumtype, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self._enumtype = enumtype

    def process_bind_param(self, value, dialect):
        if value is None:
            return None

        return value.value

    def process_result_value(self, value, dialect):
        if value is None:
            return None

        return self._enumtype(value)