import 'dart:convert';
import 'dart:io';

class FoodFactLookupClient {
  FoodFactLookupClient();

  static const String host = "world.openfoodfacts.org";
  static const String url = "https://world.openfoodfacts.org/api/v3/product/";

  String getProductUrl(String ean) {
    return "$url$ean.json";
  }

  Future<FoodFactModel> retrieveFoodInfo(String ean) async {
    HttpClient client = HttpClient();
    var request = await client.getUrl(Uri.parse(getProductUrl(ean)));
    var response = await request.close();
    var asString = await response.transform(utf8.decoder).join();
    return FoodFactModel.fromJson(jsonDecode(asString));
  }
}

class FoodFactModel {
  final String name;
  final int kcalPer100g;

  FoodFactModel({required this.name, required this.kcalPer100g});

  factory FoodFactModel.fromJson(Map<String, dynamic> json) {
    return FoodFactModel(
        name: json['product']['product_name'],
        kcalPer100g: json['product']['nutriments']['energy-kcal_100g']);
  }
}