Implement scan MVP flow

src/services/productApi.js

@@ -0,0 +1,52 @@
+import { mockProducts } from '../data/mockProducts';
+
+function delay(ms = 250) {
+  return new Promise((resolve) => setTimeout(resolve, ms));
+}
+
+export async function lookupProductByBarcode(barcode, productCache = {}, offlineModeEnabled = false) {
+  await delay();
+
+  const cachedProduct = productCache[barcode];
+  if (cachedProduct) {
+    return { status: 'found', product: cachedProduct, source: 'cache' };
+  }
+
+  if (offlineModeEnabled) {
+    return {
+      status: 'error',
+      errorMessage: 'Offline-Modus aktiv: Dieses Produkt ist noch nicht im lokalen Cache.'
+    };
+  }
+
+  const product = mockProducts.find((item) => item.barcode === barcode);
+  if (!product) {
+    return { status: 'notFound', errorMessage: 'Kein Produkt zu diesem Barcode gefunden.' };
+  }
+
+  return { status: 'found', product, source: 'mock-api' };
+}
+
+export async function searchProducts(query, productCache = {}, offlineModeEnabled = false) {
+  await delay();
+
+  const normalizedQuery = query.trim().toLowerCase();
+  const cachedProducts = Object.values(productCache);
+  const sourceProducts = offlineModeEnabled ? cachedProducts : [...mockProducts, ...cachedProducts];
+  const uniqueProducts = Array.from(new Map(sourceProducts.map((product) => [product.id, product])).values());
+
+  if (!normalizedQuery) {
+    return [];
+  }
+
+  return uniqueProducts.filter((product) => {
+    const haystack = [
+      product.name,
+      product.brand,
+      product.category,
+      product.barcode
+    ].filter(Boolean).join(' ').toLowerCase();
+
+    return haystack.includes(normalizedQuery);
+  });
+}