feat: No-Barcode Products & Manual Barcode Input

Kiosk/lib/db/database_helper.dart

@@ -124,6 +124,17 @@ class DatabaseHelper {
     return maps.map((json) => Product.fromJson(json)).toList();
   }
 
+  Future<List<Product>> searchProducts(String query) async {
+    final db = await instance.database;
+    final maps = await db.query(
+      'products',
+      where: 'barcode LIKE ? OR name LIKE ?',
+      whereArgs: ['$query%', '%$query%'],
+      limit: 20,
+    );
+    return maps.map((json) => Product.fromJson(json)).toList();
+  }
+
   Future<void> clearProducts() async {
     final db = await instance.database;
     await db.delete('products');

Kiosk/lib/l10n/app_en.arb

@@ -64,6 +64,12 @@
   "searchApps": "Search apps",
   "noAppsFound": "No apps found",
   "homeAppOpenFailed": "Can't open {package}. Opening Launcher instead.",
+  "noBarcodeProductsTitle": "No Barcode Products",
+  "noBarcodeProductsEmpty": "No no-barcode products",
+  "categories": "Categories",
+  "categoryAll": "All",
+  "categoryUncategorized": "Uncategorized",
+  "searchProducts": "Search products",
   "clear": "Clear",
   "save": "Save"
 }

Kiosk/lib/l10n/app_localizations.dart

@@ -488,6 +488,42 @@ abstract class AppLocalizations {
   /// **'Can\'t open {package}. Opening Launcher instead.'**
   String homeAppOpenFailed(Object package);
 
+  /// No description provided for @noBarcodeProductsTitle.
+  ///
+  /// In en, this message translates to:
+  /// **'No Barcode Products'**
+  String get noBarcodeProductsTitle;
+
+  /// No description provided for @noBarcodeProductsEmpty.
+  ///
+  /// In en, this message translates to:
+  /// **'No no-barcode products'**
+  String get noBarcodeProductsEmpty;
+
+  /// No description provided for @categories.
+  ///
+  /// In en, this message translates to:
+  /// **'Categories'**
+  String get categories;
+
+  /// No description provided for @categoryAll.
+  ///
+  /// In en, this message translates to:
+  /// **'All'**
+  String get categoryAll;
+
+  /// No description provided for @categoryUncategorized.
+  ///
+  /// In en, this message translates to:
+  /// **'Uncategorized'**
+  String get categoryUncategorized;
+
+  /// No description provided for @searchProducts.
+  ///
+  /// In en, this message translates to:
+  /// **'Search products'**
+  String get searchProducts;
+
   /// No description provided for @clear.
   ///
   /// In en, this message translates to:

Kiosk/lib/l10n/app_localizations_en.dart

@@ -229,6 +229,24 @@ class AppLocalizationsEn extends AppLocalizations {
     return 'Can\'t open $package. Opening Launcher instead.';
   }
 
+  @override
+  String get noBarcodeProductsTitle => 'No Barcode Products';
+
+  @override
+  String get noBarcodeProductsEmpty => 'No no-barcode products';
+
+  @override
+  String get categories => 'Categories';
+
+  @override
+  String get categoryAll => 'All';
+
+  @override
+  String get categoryUncategorized => 'Uncategorized';
+
+  @override
+  String get searchProducts => 'Search products';
+
   @override
   String get clear => 'Clear';
 

Kiosk/lib/l10n/app_localizations_zh.dart

@@ -225,6 +225,24 @@ class AppLocalizationsZh extends AppLocalizations {
     return '无法打开 $package，将打开桌面启动器。';
   }
 
+  @override
+  String get noBarcodeProductsTitle => '无条码商品';
+
+  @override
+  String get noBarcodeProductsEmpty => '暂无无条码商品';
+
+  @override
+  String get categories => '分类';
+
+  @override
+  String get categoryAll => '全部';
+
+  @override
+  String get categoryUncategorized => '未分类';
+
+  @override
+  String get searchProducts => '搜索商品';
+
   @override
   String get clear => '清除';
 

Kiosk/lib/l10n/app_zh.arb

@@ -64,6 +64,12 @@
   "searchApps": "搜索应用",
   "noAppsFound": "未找到应用",
   "homeAppOpenFailed": "无法打开 {package}，将打开桌面启动器。",
+  "noBarcodeProductsTitle": "无条码商品",
+  "noBarcodeProductsEmpty": "暂无无条码商品",
+  "categories": "分类",
+  "categoryAll": "全部",
+  "categoryUncategorized": "未分类",
+  "searchProducts": "搜索商品",
   "clear": "清除",
   "save": "保存"
 }

Kiosk/lib/screens/main_screen.dart

@@ -8,6 +8,8 @@ import 'package:kiosk/db/database_helper.dart';
 import 'package:kiosk/models/product.dart';
 import 'package:kiosk/models/order.dart' as model; // Alias to avoid conflict if needed
 import 'package:kiosk/screens/payment_screen.dart';
+import 'package:kiosk/screens/manual_barcode_dialog.dart';
+import 'package:kiosk/screens/no_barcode_products_dialog.dart';
 import 'package:kiosk/screens/settings_screen.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 import 'package:kiosk/l10n/app_localizations.dart';
@@ -260,6 +262,24 @@ class _MainScreenState extends State<MainScreen> {
     );
   }
 
+  Future<void> _openNoBarcodePicker() async {
+    final l10n = AppLocalizations.of(context)!;
+    final messenger = ScaffoldMessenger.of(context);
+    await showDialog<void>(
+      context: context,
+      builder: (context) {
+        return NoBarcodeProductsDialog(
+          onAdd: (product) {
+            _addToCart(product);
+            messenger.showSnackBar(
+              SnackBar(content: Text(l10n.addedProduct(product.name))),
+            );
+          },
+        );
+      },
+    );
+  }
+
   Future<void> _handleBarcodeDetect(BarcodeCapture capture) async {
     // Only process logic if not already processing
     if (_isProcessing) return;
@@ -649,19 +669,21 @@ class _MainScreenState extends State<MainScreen> {
                     Row(
                       children: [
                         TextButton.icon(
-                          onPressed: () {
-                             // Manual barcode entry dialog
-                             // Placeholder
+                          onPressed: () async {
+                            final product = await showDialog<Product>(
+                              context: context,
+                              builder: (context) => const ManualBarcodeDialog(),
+                            );
+                            if (product != null) {
+                              _addToCart(product);
+                            }
                           },
                           icon: const Icon(Icons.keyboard, color: Colors.grey),
                           label: Text(l10n.inputBarcode, style: const TextStyle(color: Colors.grey)),
                         ),
                         const SizedBox(width: 16),
                         TextButton.icon(
-                          onPressed: () {
-                            // No barcode selection
-                            // Placeholder
-                          },
+                          onPressed: _openNoBarcodePicker,
                           icon: const Icon(Icons.grid_view, color: Colors.grey),
                           label: Text(l10n.noBarcodeItem, style: const TextStyle(color: Colors.grey)),
                         ),