import time
import logging

from yuxi.channel.extensions.intercom.constants import (
    INTERCOM_DEDUPE_TTL_SECONDS,
    INTERCOM_DEDUPE_MAX_SIZE,
)

logger = logging.getLogger(__name__)


class DedupeCache:
    def __init__(self, ttl_seconds: int = INTERCOM_DEDUPE_TTL_SECONDS, max_size: int = INTERCOM_DEDUPE_MAX_SIZE):
        self._ttl = ttl_seconds
        self._max_size = max_size
        self._cache: dict[str, float] = {}

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

        now = time.monotonic()

        if event_id in self._cache:
            if now - self._cache[event_id] < self._ttl:
                return True

        self._cache[event_id] = now
        self._evict_expired(now)
        return False

    def check_duplicate(self, event_id: str) -> bool:
        if not event_id:
            return False
        now = time.monotonic()
        if event_id in self._cache:
            if now - self._cache[event_id] < self._ttl:
                return True
        return False

    def mark_seen(self, event_id: str) -> None:
        if not event_id:
            return
        self._cache[event_id] = time.monotonic()
        self._evict_expired(time.monotonic())

    def reset(self) -> None:
        self._cache.clear()

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

        if len(self._cache) > self._max_size:
            sorted_keys = sorted(self._cache, key=self._cache.get)
            for k in sorted_keys[: len(self._cache) - self._max_size]:
                del self._cache[k]

    def clear(self) -> None:
        self._cache.clear()