import time
from collections import defaultdict
from typing import Callable

MAX_FAILURES = 5
WINDOW_SECONDS = 300.0


class FailureLimiter:
    def __init__(self, max_failures: int = MAX_FAILURES, window: float = WINDOW_SECONDS,
                 clock: Callable[[], float] = time.monotonic):
        self._max = max_failures
        self._window = window
        self._clock = clock
        self._hits: dict[str, list[float]] = defaultdict(list)

    def _prune(self, key: str) -> list[float]:
        cutoff = self._clock() - self._window
        hits = [t for t in self._hits[key] if t > cutoff]
        if hits:
            self._hits[key] = hits
        else:
            self._hits.pop(key, None)
        return hits

    def blocked(self, key: str) -> bool:
        return len(self._prune(key)) >= self._max

    def record(self, key: str) -> None:
        self._prune(key)
        self._hits[key].append(self._clock())

    def reset(self, key: str) -> None:
        self._hits.pop(key, None)