from collections import OrderedDict
import time
import logging

logger = logging.getLogger(__name__)

DEDUPE_TTL_SECONDS = 3600
DEDUPE_MAX_ENTRIES = 1000


class ZoomMessageDeduplicator:
    def __init__(self, ttl: int = DEDUPE_TTL_SECONDS, max_entries: int = DEDUPE_MAX_ENTRIES):
        self._ttl = ttl
        self._max = max_entries
        self._seen: OrderedDict[str, float] = OrderedDict()

    def is_duplicate(self, event_ts: int, message_id: str) -> bool:
        key = f"{event_ts}:{message_id}"
        self._cleanup()

        if key in self._seen:
            logger.debug("Zoom webhook duplicate event: %s", key)
            return True

        self._seen[key] = time.time()
        while len(self._seen) > self._max:
            self._seen.popitem(last=False)
        return False

    def _cleanup(self):
        now = time.time()
        expired = [k for k, v in self._seen.items() if now - v > self._ttl]
        for k in expired:
            self._seen.pop(k, None)