from enum import Enum, auto

class EventType(Enum):
    SESSION_PROFILE_ENABLE = auto()
    SESSION_PROFILE_DISABLE = auto()
    SYSTEM_ENABLE = auto()
    SYSTEM_DISABLE = auto()
    PROFILE_CREATED = auto()
    PROFILE_DELETED = auto()

class Notifications:
    _subscribers = {}

    @classmethod
    def subscribe(cls, event_type: EventType, callback):
        if event_type not in cls._subscribers:
            cls._subscribers[event_type] = []
        cls._subscribers[event_type].append(callback)

    @classmethod
    def emit(cls, event_type: EventType, data=None):
        for callback in cls._subscribers.get(event_type, []):
            callback(data)