import time
from threading import Event, Thread
from typing import Callable, Optional


class CountdownTimer(Thread):
    def __init__(
        self, seconds: int, callback: Optional[Callable[[], None]] = None
    ) -> None:
        self.seconds = seconds
        self.stop_event = Event()
        self.callback = callback
        super().__init__(daemon=True)

    def run(self) -> None:
        cnt = self.seconds
        while cnt and not self.stop_event.is_set():
            cnt -= 1
            time.sleep(1)

        if cnt == 0 and self.callback:
            self.callback()

    def stop(self) -> None:
        self.stop_event.set()