import logging
import secrets
import time

logger = logging.getLogger("yuxi.channel.xmpp.pairing")

_PAIRING_CODES: dict[str, tuple[str, float]] = {}
_CODE_TTL_SECONDS = 300


async def generate_xmpp_pairing_code(peer_id: str) -> str:
    code = f"{secrets.randbelow(1_000_000):06d}"
    _PAIRING_CODES[peer_id] = (code, time.monotonic())
    logger.info("XMPP pairing code generated for peer %s", peer_id)
    return code


async def verify_xmpp_pairing_code(peer_id: str, code: str) -> bool:
    stored = _PAIRING_CODES.get(peer_id)
    if stored is None:
        return False
    stored_code, created_at = stored
    if time.monotonic() - created_at > _CODE_TTL_SECONDS:
        _PAIRING_CODES.pop(peer_id, None)
        return False
    if not secrets.compare_digest(stored_code, code):
        return False
    _PAIRING_CODES.pop(peer_id, None)
    logger.info("XMPP pairing code verified for peer %s", peer_id)
    return True


def normalize_xmpp_allow_entry(entry: str) -> str:
    return entry.strip().split("/")[0].lower()