# бла-бла
# Программа имитирует отношения пульта дистанционного
# управления, телевизора, и переключателей каналов со звуком.
from abc import ABCMeta, abstractmethod
from enum import Enum
class Observer:
    def __init__(self):
        self.__observer = None
    def set_observer(self, observer):
        self.__observer = observer
    def observer_notify(self):
        self.__observer.update(self)
class Remote(Observer):
    def __init__(self):
        super().__init__()
        self.way_of_change = None
        self.changeable_property = None
    def reduces(self, a_property: "Property"):
        self.changeable_property = a_property
        self.way_of_change = WayOfChange.REDUCE
        print(a_property.value)
        self.observer_notify()
    def increases(self, a_property: "Property"):
        self.changeable_property = a_property
        self.way_of_change = WayOfChange.INCREASE
        self.observer_notify()
class TV:
    def __init__(self):
        self.__properties = []
        self.__switches = []
    def update(self, remote: "Remote"):
        print(self.__class__.__name__, "принял оповещение от",
              remote.__class__.__name__)
        if not isinstance(remote, Remote):
            print("это не пульт")
            return
        for switch in self.switches__cl:
            if switch.controlled_property.equal(
                    remote.changeable_property):
                if remote.way_of_change is WayOfChange.INCREASE:
                    switch.increment_value()
                elif remote.way_of_change is WayOfChange.REDUCE:
                    switch.decrement_value()
            else:
                pass
    @property
    def switches__cl(self):
        return self.__switches[:]
    def adds_switches(self, *switches: "Switch"):
        for switch in switches:
            if isinstance(switch, Switch):
                self.__switches.append(switch)
    def adds_new_properties(self, *properties: "PropertyOfTV"):
        for a_property in properties:
            if isinstance(a_property, PropertyOfTV):
                self.__properties.append(a_property)
    def watch(self):
        pass
    def turn_on(self):
        pass
class WayOfChange(Enum):
    INCREASE = "+"
    REDUCE = "-"
class Property(Enum):
    SOUND = "sound"
    CHANNELS = "channels"
class PropertyOfTV(metaclass=ABCMeta):
    def __init__(self, a_property: "Property",
                 *,
                 max_value=10,
                 min_value=0
                 ):
        self.__min_value = min_value
        self.__max_value = max_value
        self.__property = a_property
        self.__value = self.__min_value
    @property
    def value(self):
        return self.__value
    @value.setter
    def value(self, new_value):
        # Если изменения выходят за диапазон, то не вносятся
        if not self.__is_value_error(new_value):
            self.__value = new_value
            print("было изменено ", end="")
        elif self.max_value < new_value \
                or new_value < self.min_value:
            print("не изменилось.")
            pass
        print("и равно теперь", self.value)
    @property
    def property_tv(self):
        return self.__property
    @property
    def min_value(self):
        return self.__min_value
    @property
    def max_value(self):
        return self.__max_value
    def equal(self, a_property: "Property"):
        if self.property_tv is a_property:
            return True
        else:
            return False
    def __is_value_error(self, new_value):
        if self.min_value > new_value < self.__max_value:
            return True
        else:
            return False
class Switch(metaclass=ABCMeta):
    def __init__(self, controlled_property: "PropertyOfTV",
                 *, change_step):
        self.__controlled_property = controlled_property
        self.__change_step = change_step
    @property
    def controlled_property(self):
        return self.__controlled_property
    @property
    def change_step(self):
        return self.__change_step
    def increment_value(self):
        new_value = \
            self.controlled_property.value + self.change_step
        self.__change_controlled_property_value(new_value)
    def decrement_value(self):
        new_value = \
            self.controlled_property.value - self.change_step
        self.__change_controlled_property_value(new_value)
    @abstractmethod
    def _interaction_with_limits_of_boundary_values(сам, new_value):
        pass
    def __change_controlled_property_value(self, new_value):
        print(self.__class__.__name__, "переключает",
              self.controlled_property.property_tv.value, "и оно", end="")
        if self.__is_value_in_the_admissible_range(new_value):
            self.controlled_property.value = new_value
        else:
            self._interaction_with_limits_of_boundary_values(new_value)
    def __is_value_in_the_admissible_range(self, num):
        if self.controlled_property.min_value \
                <= num \
                <= self.controlled_property.max_value:
            return True
        else:
            return False
class LinearSwitcher(Switch):
    """При достижении крайних значений - останавливается"""
    def _interaction_with_limits_of_boundary_values(self, new_value):
        if new_value > self.controlled_property.max_value:
            self.controlled_property.value = \
                self.controlled_property.max_value
        elif new_value < self.controlled_property.min_value:
            self.controlled_property.value = \
                self.controlled_property.min_value
        else:
            print("Но оно не изменилось.")
class CircleSwitcher(Switch):
    """При достижении крайнего значения, переключается на противоположное."""
    def _interaction_with_limits_of_boundary_values(self, new_value):
        if new_value > self.controlled_property.max_value:
            normalized_value = \
                self.__normalizes_value(
                    self.controlled_property.max_value
                )
            self.controlled_property.value = \
                new_value - normalized_value
        elif new_value < self.controlled_property.min_value:
            normalized_value = \
                self.__normalizes_value(new_value)
            self.controlled_property.value = \
                self.controlled_property.max_value - \
                normalized_value
    def __normalizes_value(self, num_for_normalize):
        normalized_value = \
            num_for_normalize - self.controlled_property.min_value
        return normalized_value
if __name__ == "__main__":
    def testing():
        print("Тестовая программа запущена.")
        property1 = PropertyOfTV(
            Property.CHANNELS,
            max_value=50,
            min_value=20,
        )
        property2 = PropertyOfTV(
            Property.SOUND,
            max_value=10,
            min_value=0,
        )
        tv = TV()
        tv.adds_new_properties(property1, property2)
        tv.adds_switches(
            LinearSwitcher(property2, change_step=1),
            CircleSwitcher(property1, change_step=1)
        )
        remote = Remote()
        remote.set_observer(tv)
        def to_increase(a_property, val):
            for _ in range(val):
                print("Кто-то нажал на кнопку увеличивая",
                      a_property.value)
                remote.increases(a_property)
        def to_decrease(a_property, val):
            for _ in range(val):
                print("Кто-то нажал на кнопку увеличивая",
                      a_property.value)
                remote.reduces(a_property)
        to_increase(Property.SOUND, 12)
        to_decrease(Property.SOUND, 15)
        to_increase(Property.CHANNELS, 40)
        to_decrease(Property.CHANNELS, 50)
    testing()

if self.controlled_property.min_value \
                <= num \
                <= self.controlled_property.max_value:
            return True
        else:
            return False

    @property
    def property_tv(self):
        return self.__property
    @property
    def min_value(self):
        return self.__min_value
    @property
    def max_value(self):
        return self.__max_value

return self.controlled_property.min_value  <= num <= self.controlled_property.max_value

return self.controlled_property.min_value \
       <= num \
       <= self.controlled_property.max_value

return self.controlled_property.min_value <= num <= self.controlled_property.max_value

return self.controlled_property.min_value <= num <= self.controlled_property.max_value