from __future__ import annotations

import time
from collections import OrderedDict


class IrcDedupeCache:

    def __init__(self, maxsize: int = 5000, ttl_seconds: int = 300):
        self._maxsize = maxsize
        self._ttl = ttl_seconds
        self._cache: OrderedDict[str, float] = OrderedDict()

    def __contains__(self, key: str) -> bool:
        now = time.monotonic()
        if key in self._cache:
            if now - self._cache[key] < self._ttl:
                self._cache.move_to_end(key)
                return True
            del self._cache[key]
        return False

    def add(self, key: str) -> None:
        now = time.monotonic()
        self._evict_expired(now)
        self._cache[key] = now
        self._cache.move_to_end(key)
        if len(self._cache) > self._maxsize:
            self._cache.popitem(last=False)

    def _evict_expired(self, now: float) -> None:
        expired = [k for k, ts in self._cache.items() if now - ts >= self._ttl]
        for k in expired:
            del self._cache[k]

    def __len__(self) -> int:
        return len(self._cache)