import os
import logging

from fastapi import Header, HTTPException
from starlette.requests import Request

logger = logging.getLogger("stock")


def verify_webai_key(
    request: Request,
    x_webai_key: str | None = Header(default=None, alias="X-WebAI-Key"),
) -> None:
    """
    /api/webai/* 보호용 FastAPI dependency.

    - WEBAI_API_KEY env 미설정 → 503 (다른 endpoint 무영향)
    - 헤더 누락 또는 키 불일치 → 401 + logger.warning(ip)
    """
    configured = os.getenv("WEBAI_API_KEY", "").strip()
    if not configured:
        logger.error("WEBAI_API_KEY not configured — refusing /api/webai/* request")
        raise HTTPException(status_code=503, detail="webai auth not configured")

    if not x_webai_key or x_webai_key != configured:
        remote = request.client.host if request.client else "?"
        logger.warning("auth_fail path=%s remote=%s", request.url.path, remote)
        raise HTTPException(status_code=401, detail="invalid or missing X-WebAI-Key")