from typing import Any

import httpx

from app.config import get_settings


class OpenFoodFactsClient:
    def __init__(self) -> None:
        settings = get_settings()
        self.base_url = settings.openfoodfacts_base_url.rstrip("/")

    def search(self, query: str, limit: int = 5) -> list[dict[str, Any]]:
        with httpx.Client(timeout=20.0) as client:
            response = client.get(
                f"{self.base_url}/cgi/search.pl",
                params={
                    "search_terms": query,
                    "search_simple": 1,
                    "action": "process",
                    "json": 1,
                    "page_size": limit,
                    "lc": "ru",
                },
            )
            response.raise_for_status()
            products = response.json().get("products") or []

        out: list[dict[str, Any]] = []
        for p in products[:limit]:
            nutriments = p.get("nutriments") or {}
            out.append(
                {
                    "name": p.get("product_name") or p.get("product_name_ru") or query,
                    "brand": p.get("brands", ""),
                    "barcode": p.get("code"),
                    "calories_per_100g": nutriments.get("energy-kcal_100g"),
                    "protein_g_per_100g": nutriments.get("proteins_100g"),
                    "fat_g_per_100g": nutriments.get("fat_100g"),
                    "carbs_g_per_100g": nutriments.get("carbohydrates_100g"),
                }
            )
        return out

    def get_by_barcode(self, barcode: str) -> dict[str, Any] | None:
        with httpx.Client(timeout=20.0) as client:
            response = client.get(f"{self.base_url}/api/v2/product/{barcode}.json")
            if response.status_code == 404:
                return None
            response.raise_for_status()
            product = response.json().get("product")
            if not product:
                return None
            nutriments = product.get("nutriments") or {}
            return {
                "name": product.get("product_name") or product.get("product_name_ru"),
                "barcode": barcode,
                "calories_per_100g": nutriments.get("energy-kcal_100g"),
                "protein_g_per_100g": nutriments.get("proteins_100g"),
                "fat_g_per_100g": nutriments.get("fat_100g"),
                "carbs_g_per_100g": nutriments.get("carbohydrates_100g"),
            }