from dataclasses import dataclass
from logging import getLogger

import httpx

logger = getLogger(__name__)


class NotFound(Exception):
    pass


class ParseError(Exception):
    pass


@dataclass
class ExternalProduct:
    name: str
    kcal: float
    fat: float
    protein: float
    carb: float
    fiber: float


async def find(barcode: str) -> ExternalProduct:
    async with httpx.AsyncClient() as client:
        response = await client.get(
            f"https://world.openfoodfacts.org/api/v2/product/{barcode}.json",
            headers={"User-Agent": "fooder/1.0"},
        )

    if response.status_code == 404:
        raise NotFound()

    try:
        data = response.json()
        product_data = data["product"]
        name = product_data.get("product_name_pl") or product_data.get("product_name")
        if brands := product_data.get("brands"):
            name = f"{brands} {name}"
        n = product_data["nutriments"]
        return ExternalProduct(
            name=name,
            kcal=n.get("energy-kcal_100g") or 0.0,
            fat=n.get("fat_100g") or 0.0,
            protein=n.get("proteins_100g") or 0.0,
            carb=n.get("carbohydrates_100g") or 0.0,
            fiber=n.get("fiber_100g") or 0.0,
        )
    except (KeyError, TypeError) as e:
        logger.error("Failed to parse product %s: %s", barcode, e)
        raise ParseError() from e