"""Minimal in-process sliding-window rate limiter. Production should use Redis (INCR+EXPIRE)

so limits hold across workers; this keeps the dev stack dependency-free."""

from __future__ import annotations

import time

from collections import defaultdict, deque

class RateLimiter:

    def __init__(self, per_minute: int):

        self.per_minute = per_minute

        self._hits: dict[str, deque[float]] = defaultdict(deque)

    def allow(self, key: str) -> bool:

        now = time.monotonic()

        window = self._hits[key]

        while window and now - window[0] > 60.0:

            window.popleft()

        if len(window) >= self.per_minute:

            return False

        window.append(now)

        return True