from collections.abc import Callable


class UserInterface:
	def __init__(self):
		self.user_info_listeners: list[Callable[[str, str], None]] = []
		self.start_listeners: list[Callable[[list[str]], None]] = []

	def receive_user(self, name: str):
		pass

	def announce_recipient(self, name: str, other_info: str):
		pass

	def set_user_info(self, name: str, info_for_santa: str):
		for listener in self.user_info_listeners:
			listener(name, info_for_santa)

	def start_exchange(self, list_of_participants: list[str]):
		for listener in self.start_listeners:
			listener(list_of_participants)

	def add_user_info_listener(self, callback: Callable[[str, str], None]):
		self.user_info_listeners.append(callback)

	def add_start_listener(self, callback: Callable[[list[str]], None]):
		self.start_listeners.append(callback)