from common.global_symbols import NotFound
from common.utils import sheerka_deepcopy
from core.Sheerka import Sheerka


class BaseService:
    """
    Base class for services
    """

    def __init__(self, sheerka: Sheerka, order=999):
        self.sheerka = sheerka
        self.order = order  # initialisation order. The lowest is initialized first

    def initialize(self):
        """
        Adds cache or bind methods
        :return:
        """
        pass

    def state_properties(self):
        pass

    def push_state(self, context):
        """
        Use variable Manager to store the state of the service
        """
        args = self.state_properties()
        if args:
            for prop_name in args:
                self.sheerka.record_var(context, self.NAME, prop_name, sheerka_deepcopy(getattr(self, prop_name)))

    def pop_state(self):
        """
        Use Variable Manager to restore the state of a service
        :return:
        """
        args = self.state_properties()
        if args:
            for prop_name in args:
                if (value := self.sheerka.load_var(self.NAME, prop_name)) is not NotFound:
                    setattr(self, prop_name, value)

    def store_var(self, context, var_name):
        """
        Store/record the value of an attribute
        """
        self.sheerka.record_var(context, self.NAME, var_name, getattr(self, var_name))