from fastapi import HTTPException, Query
from fastapi.responses import PlainTextResponse
import logging

logger = logging.getLogger(__name__)


async def verify_webhook_challenge(
    hub_mode: str = Query(None, alias="hub.mode"),
    hub_challenge: str = Query(None, alias="hub.challenge"),
    hub_verify_token: str = Query(None, alias="hub.verify_token"),
    expected_verify_token: str = "",
):
    if hub_mode != "subscribe":
        raise HTTPException(status_code=400, detail="Invalid hub.mode")

    if not expected_verify_token or hub_verify_token != expected_verify_token:
        logger.warning("Webhook verify_token mismatch")
        raise HTTPException(status_code=403, detail="Verify token mismatch")

    logger.info("Webhook verified successfully")
    return PlainTextResponse(hub_challenge or "", status_code=200)