from threading import Lock


class TrafficLight:
    def __init__(self):
        self.lock = Lock()
        self.road = 1

    def carArrived(
        self,
        carId: int,  # ID of the car
        # ID of the road the car travels on. Can be 1 (road A) or 2 (road B)
        roadId: int,
        direction: int,  # Direction of the car
        # Use turnGreen() to turn light to green on current road
        turnGreen: 'Callable[[], None]',
        # Use crossCar() to make car cross the intersection
        crossCar: 'Callable[[], None]',
    ) -> None:
        self.lock.acquire()
        if self.road != roadId:
            self.road = roadId
            turnGreen()
        crossCar()
        self.lock.release()
