"""Tiny TTL cache (in-memory). Redis can replace it via REDIS_URL later."""

from __future__ import annotations

import time
from typing import Any


class TTLCache:
    def __init__(self) -> None:
        self._data: dict[str, tuple[float, Any]] = {}

    def get(self, key: str) -> Any | None:
        item = self._data.get(key)
        if not item:
            return None
        exp, value = item
        if exp < time.time():
            self._data.pop(key, None)
            return None
        return value

    def set(self, key: str, value: Any, ttl_s: int) -> None:
        if len(self._data) > 5000:
            now = time.time()
            for k in [k for k, (e, _) in self._data.items() if e < now]:
                self._data.pop(k, None)
        self._data[key] = (time.time() + ttl_s, value)


cache = TTLCache()