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lib/core/services/print_service.dart

@@ -21,16 +21,25 @@ class PrintService {
     String? responsibleName,
     String? barcodeData,
   }) async {
+    // Load Vietnamese-compatible fonts using PdfGoogleFonts
+    // Noto Sans has excellent Vietnamese character support
+    final fontRegular = await PdfGoogleFonts.notoSansRegular();
+    final fontBold = await PdfGoogleFonts.notoSansBold();
+
     final pdf = pw.Document();
 
     // Format current date
     final dt = DateFormat('dd/MM/yyyy HH:mm').format(DateTime.now());
 
-    // Add page to PDF
+    // Add page to PDF with theme for Vietnamese font support
     pdf.addPage(
       pw.Page(
         pageFormat: PdfPageFormat.a4,
         margin: const pw.EdgeInsets.all(12),
+        theme: pw.ThemeData.withFont(
+          base: fontRegular,
+          bold: fontBold,
+        ),
         build: (pw.Context pdfContext) {
           return pw.Container(
             padding: const pw.EdgeInsets.all(12),

lib/features/products/presentation/pages/product_detail_page.dart

@@ -362,12 +362,7 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
                           title: 'Thêm số lượng mới',
                           icon: Icons.add_circle_outline,
                           children: [
-                            _buildTextField(
-                              label: 'Số lượng đạt',
-                              controller: _passedQuantityController,
-                              keyboardType: TextInputType.number,
-                              theme: theme,
-                            ),
+
                             _buildTextField(
                               label: 'Khối lượng đạt (kg)',
                               controller: _passedWeightController,
@@ -375,8 +370,8 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
                               theme: theme,
                             ),
                             _buildTextField(
-                              label: 'Số lượng lỗi',
-                              controller: _issuedQuantityController,
+                              label: 'Số lượng đạt',
+                              controller: _passedQuantityController,
                               keyboardType: TextInputType.number,
                               theme: theme,
                             ),
@@ -386,13 +381,20 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
                               keyboardType: const TextInputType.numberWithOptions(decimal: true),
                               theme: theme,
                             ),
+                            _buildTextField(
+                              label: 'Số lượng lỗi',
+                              controller: _issuedQuantityController,
+                              keyboardType: TextInputType.number,
+                              theme: theme,
+                            ),
+
                           ],
                         ),
 
                         _buildSectionCard(theme: theme, title: "Nhân viên", icon: Icons.people, children: [
-                          // Warehouse User Dropdown
+                          // Warehouse User Dropdown (Required)
                           _buildUserDropdown(
-                            label: 'Người dùng kho',
+                            label: 'Người dùng kho *',
                             value: _selectedWarehouseUser,
                             users: ref.watch(usersListProvider)
                                 .where((user) => user.isWareHouseUser)
@@ -405,9 +407,9 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
                             theme: theme,
                           ),
                           const SizedBox(height: 8),
-                          // All Employees Dropdown
+                          // All Employees Dropdown (Required)
                           _buildUserDropdown(
-                            label: 'Nhân viên',
+                            label: 'Nhân viên *',
                             value: _selectedEmployee,
                             users: ref.watch(usersListProvider),
                             onChanged: (user) {
@@ -448,6 +450,18 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
   }
 
   Future<void> _printQuantities(ProductStageEntity stage) async {
+    // Validate that both users are selected
+    if (_selectedEmployee == null || _selectedWarehouseUser == null) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Vui lòng chọn cả Nhân viên và Người dùng kho trước khi in'),
+          backgroundColor: Colors.orange,
+          duration: Duration(seconds: 3),
+        ),
+      );
+      return;
+    }
+
     // Get the current quantity values (entered by user or use current values)
     final passedQuantity = int.tryParse(_passedQuantityController.text) ?? 0;
     final passedWeight = double.tryParse(_passedWeightController.text) ?? 0.0;
@@ -461,9 +475,7 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
     final finalIssuedKg = issuedWeight > 0.0 ? issuedWeight : stage.issuedQuantityWeight;
 
     // Get responsible user name
-    final responsibleName = _selectedWarehouseUser != null
-        ? '${_selectedWarehouseUser!.name} ${_selectedWarehouseUser!.firstName}'
-        : null;
+    final responsibleName = '${_selectedWarehouseUser!.name} ${_selectedWarehouseUser!.firstName}';
 
     // Generate barcode data (using product code or product ID)
     final barcodeData = stage.productCode.isNotEmpty
@@ -521,8 +533,9 @@ class _ProductDetailPageState extends ConsumerState<ProductDetailPage> {
     if (_selectedEmployee == null || _selectedWarehouseUser == null) {
       ScaffoldMessenger.of(context).showSnackBar(
         const SnackBar(
-          content: Text('Vui lòng chọn cả Nhân viên và Người dùng kho'),
+          content: Text('Vui lòng chọn cả Nhân viên và Người dùng kho trước khi lưu'),
           backgroundColor: Colors.orange,
+          duration: Duration(seconds: 3),
         ),
       );
       return;