from typing import Union, Optional

from cpl.dependency_injection.service_lifetime_enum import ServiceLifetimeEnum


class ServiceDescriptor:

    def __init__(self, implementation: Union[type, Optional[object]], lifetime: ServiceLifetimeEnum):

        self._service_type = implementation
        self._implementation = implementation
        self._lifetime = lifetime

        if not isinstance(implementation, type):
            self._service_type = type(implementation)
        else:
            self._implementation = None

    @property
    def service_type(self) -> type:
        return self._service_type

    @property
    def implementation(self) -> Union[type, Optional[object]]:
        return self._implementation

    @implementation.setter
    def implementation(self, implementation: Union[type, Optional[object]]):
        self._implementation = implementation

    @property
    def lifetime(self) -> ServiceLifetimeEnum:
        return self._lifetime