import builtins

from core import get_logger


class EventsSystem:

    def __init__(self):
        self.__events = {
            "on_started": [self.on_started],
            "on_stop": [self.on_stop],
            "on_auth": [self.on_auth]
        }
        self.log = get_logger("EventsSystem")

    def builtins_hook(self):
        self.log.debug("used builtins_hook")
        builtins.ev = self

    def register_event(self, event_name, event_func):
        self.log.debug(f"register_event({event_name}, {event_func}):")
        if not callable(event_func):
            self.log.error(f"Cannot add event '{event_name}'. "
                           f"Use `KuiToi.add_event({event_name}', function)` instead. Skipping it...")
            return
        if event_name not in self.__events:
            self.__events.update({str(event_name): [event_func]})
        else:
            self.__events[event_name].append(event_func)

    def call_event(self, event_name, *data):
        self.log.debug(f"Using event '{event_name}'")
        if event_name in self.__events.keys():
            for event in self.__events[event_name]:
                event(*data)
        else:
            self.log.warning(f"Event {event_name} does not exist. Just skipping it...")

    def on_started(self):
        pass

    def on_stop(self):
        pass

    def on_auth(self, client):
        pass