from __future__ import annotations

import time
from collections import OrderedDict


class AliyunSmsDeduplicator:
    def __init__(self, max_size: int = 10000, ttl: int = 86400):
        self._cache: OrderedDict[str, float] = OrderedDict()
        self._max_size = max_size
        self._ttl = ttl

    @property
    def ttl_seconds(self) -> int:
        return self._ttl

    @property
    def max_entries(self) -> int:
        return self._max_size

    def is_duplicate(self, key: str) -> bool:
        if not key:
            return False

        self._gc()
        return key in self._cache

    def mark_seen(self, key: str):
        if not key:
            return

        self._gc()
        self._cache[key] = time.time()
        self._evict_oldest()

    def reset(self):
        self._cache.clear()

    def _gc(self):
        now = time.time()
        expired = [k for k, ts in self._cache.items() if now - ts > self._ttl]
        for k in expired:
            del self._cache[k]

    def _evict_oldest(self):
        while len(self._cache) > self._max_size:
            self._cache.popitem(last=False)