"""OpenFoodFacts proxy (spec §3.5). All OFF calls go through this router.

OFF etiquette (spec §8.1 rule 10): descriptive User-Agent, timeouts, and
kcal-vs-kJ normalization in exactly one module. Tests mock at the httpx
boundary — never hit the real OFF API (spec §8.4).
"""

import httpx
from fastapi import APIRouter

OFF_BASE_URL = "https://world.openfoodfacts.org"
OFF_USER_AGENT = "CalCount/0.1 (personal self-hosted calorie counter)"
OFF_TIMEOUT = 10.0

router = APIRouter(prefix="/api/off", tags=["off"])


@router.get("/product/{barcode}")
def get_product(barcode: str):
    """Proxy a product lookup by barcode. Returns raw OFF JSON for now.

    TODO: normalize to our foods schema (spec §3.5) in one shared module.
    """
    resp = httpx.get(
        f"{OFF_BASE_URL}/api/v2/product/{barcode}",
        headers={"User-Agent": OFF_USER_AGENT},
        timeout=OFF_TIMEOUT,
    )
    resp.raise_for_status()
    return resp.json()