apps/backend/__tests__/off-service.test.js

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+import { transformOFFProduct, searchBabyProducts, getBabyProductDetails } from '../off-service.js';
+
+describe('transformOFFProduct', () => {
+  test('transforms a valid OFF product to unified model', () => {
+    const offProduct = {
+      _id: '12345',
+      product_name: 'Baby Rice',
+      brands: 'Nestlé',
+      image_url: 'https://example.com/image.jpg',
+      nutriscore_grade: 'a',
+      ingredients_text: 'Rice, Iron, Vitamins',
+      nova_group: 1,
+      ecoscore_grade: 'b',
+      categories_tags: ['en:baby-foods', 'en:baby-rice'],
+    };
+
+    const result = transformOFFProduct(offProduct);
+
+    expect(result).toEqual({
+      id: '12345',
+      source: 'openfoodfacts',
+      name: 'Baby Rice',
+      brand: 'Nestlé',
+      category: 'baby_food',
+      image_url: 'https://example.com/image.jpg',
+      nutriscore: 'a',
+      ingredients: 'Rice, Iron, Vitamins',
+      nova_group: 1,
+      eco_score: 'b',
+    });
+  });
+
+  test('returns null for null/undefined input', () => {
+    expect(transformOFFProduct(null)).toBeNull();
+    expect(transformOFFProduct(undefined)).toBeNull();
+  });
+
+  test('returns null when missing required fields', () => {
+    expect(transformOFFProduct({ _id: '123' })).toBeNull();
+    expect(transformOFFProduct({ product_name: 'Test' })).toBeNull();
+  });
+
+  test('sets default brand to empty string when missing', () => {
+    const result = transformOFFProduct({
+      _id: '999',
+      product_name: 'Plain Product',
+    });
+    expect(result.brand).toBe('');
+    expect(result.image_url).toBeNull();
+    expect(result.nutriscore).toBeNull();
+    expect(result.ingredients).toBeNull();
+    expect(result.nova_group).toBeNull();
+    expect(result.eco_score).toBeNull();
+  });
+
+  test('detects baby_milk category from tags', () => {
+    const result = transformOFFProduct({
+      _id: '200',
+      product_name: 'Infant Formula',
+      categories_tags: ['en:infant-milk'],
+    });
+    expect(result.category).toBe('baby_milk');
+  });
+
+  test('detects baby_cereal category from tags', () => {
+    const result = transformOFFProduct({
+      _id: '300',
+      product_name: 'Baby Cereal',
+      categories_tags: ['en:baby-cereals'],
+    });
+    expect(result.category).toBe('baby_cereal');
+  });
+});
+
+describe('searchBabyProducts', () => {
+  test('returns empty array for short query', async () => {
+    const result = await searchBabyProducts('a');
+    expect(result).toEqual([]);
+  });
+
+  test('returns empty array for null/empty query', async () => {
+    expect(await searchBabyProducts(null)).toEqual([]);
+    expect(await searchBabyProducts('')).toEqual([]);
+  });
+});
+
+describe('getBabyProductDetails', () => {
+  test('returns null for null barcode', async () => {
+    const result = await getBabyProductDetails(null);
+    expect(result).toBeNull();
+  });
+});

apps/backend/off-service.js

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+import axios from 'axios';
+import redisClient from './redis-client.js';
+
+const OFF_API_BASE = 'https://world.openfoodfacts.org/api/v2';
+const CACHE_TTL = 3600;
+
+const BABY_CATEGORIES = {
+  'baby food': 'baby_food',
+  'baby milk': 'baby_milk',
+  'baby cereal': 'baby_cereal',
+};
+
+export function transformOFFProduct(offProduct) {
+  if (!offProduct || !offProduct._id || !offProduct.product_name) {
+    return null;
+  }
+
+  const categoriesTags = offProduct.categories_tags || [];
+  let category = 'baby_food';
+  for (const tag of categoriesTags) {
+    const lower = tag.toLowerCase();
+    if (lower.includes('baby-milk') || lower.includes('infant-milk')) {
+      category = 'baby_milk';
+      break;
+    }
+    if (lower.includes('baby-cereal') || lower.includes('infant-cereal')) {
+      category = 'baby_cereal';
+      break;
+    }
+  }
+
+  return {
+    id: offProduct._id,
+    source: 'openfoodfacts',
+    name: offProduct.product_name,
+    brand: offProduct.brands || '',
+    category,
+    image_url: offProduct.image_url || null,
+    nutriscore: offProduct.nutriscore_grade || null,
+    ingredients: offProduct.ingredients_text || null,
+    nova_group: offProduct.nova_group || null,
+    eco_score: offProduct.ecoscore_grade || null,
+  };
+}
+
+export async function searchBabyProducts(query) {
+  if (!query || query.trim().length < 2) {
+    return [];
+  }
+
+  const searchTerm = query.trim().toLowerCase();
+  const cacheKey = `off:baby:${searchTerm}`;
+
+  try {
+    const cachedData = await redisClient.get(cacheKey);
+    if (cachedData) {
+      console.log(`📦 Cache hit for OFF search: ${searchTerm}`);
+      return JSON.parse(cachedData);
+    }
+
+    console.log(`🌐 Fetching from OFF API: ${searchTerm}`);
+    const response = await axios.get(`${OFF_API_BASE}/search`, {
+      params: {
+        categories_tags: 'baby-food',
+        search_terms: searchTerm,
+        json: true,
+        fields: 'product_name,brands,image_url,nutriscore_grade,ingredients_text,nova_group,ecoscore_grade,categories_tags',
+        page_size: 20,
+      },
+      timeout: 5000,
+    });
+
+    if (response.data && response.data.products) {
+      const products = response.data.products
+        .map(transformOFFProduct)
+        .filter(Boolean);
+
+      await redisClient.setEx(cacheKey, CACHE_TTL, JSON.stringify(products));
+      console.log(`✅ Cached ${products.length} OFF products for: ${searchTerm}`);
+      return products;
+    }
+
+    return [];
+  } catch (error) {
+    console.error('Error searching baby products from OFF:', error.message);
+    return [];
+  }
+}
+
+export async function getBabyProductDetails(barcode) {
+  if (!barcode) {
+    return null;
+  }
+
+  const cacheKey = `off:product:${barcode}`;
+
+  try {
+    const cachedData = await redisClient.get(cacheKey);
+    if (cachedData) {
+      console.log(`📦 Cache hit for OFF product: ${barcode}`);
+      return JSON.parse(cachedData);
+    }
+
+    console.log(`🌐 Fetching OFF product details: ${barcode}`);
+    const response = await axios.get(`${OFF_API_BASE}/product/${barcode}.json`, {
+      timeout: 5000,
+    });
+
+    if (response.data && response.data.product) {
+      const product = transformOFFProduct(response.data.product);
+
+      if (product) {
+        await redisClient.setEx(cacheKey, CACHE_TTL, JSON.stringify(product));
+        console.log(`✅ Cached OFF product: ${barcode}`);
+        return product;
+      }
+    }
+
+    return null;
+  } catch (error) {
+    console.error(`Error fetching OFF product ${barcode}:`, error.message);
+    return null;
+  }
+}
+
+export async function clearCache(pattern = 'off:*') {
+  try {
+    const keys = await redisClient.keys(pattern);
+    if (keys.length > 0) {
+      await redisClient.del(keys);
+      console.log(`🗑️ Cleared ${keys.length} OFF cache entries`);
+      return keys.length;
+    }
+    return 0;
+  } catch (error) {
+    console.error('Error clearing OFF cache:', error);
+    return 0;
+  }
+}