fix: reformat code / code improvements

lib/models/bar_tab.dart

@@ -1,4 +1,5 @@
 import 'tab_item.dart';
+import '../utils/collection_utils.dart';
 
 class BarTab {
   final String id;
@@ -40,7 +41,7 @@ class BarTab {
           status == other.status &&
           openedAt == other.openedAt &&
           closedAt == other.closedAt &&
-          _listEquals(items, other.items);
+          listEquals(items, other.items);
 
   @override
   int get hashCode => Object.hash(
@@ -53,12 +54,4 @@ class BarTab {
       );
 }
 
-bool _listEquals<T>(List<T>? a, List<T>? b) {
+// _listEquals moved to utils/collection_utils.dart
-  if (identical(a, b)) return true;
-  if (a == null || b == null) return a == b;
-  if (a.length != b.length) return false;
-  for (int i = 0; i < a.length; i++) {
-    if (a[i] != b[i]) return false;
-  }
-  return true;
-}

lib/models/closed_tab.dart

@@ -1,16 +1,18 @@
 import 'package:intl/intl.dart';
 
 import 'closed_tab_item.dart';
+import 'payment_method.dart';
+import '../utils/collection_utils.dart';
 
 class ClosedTab {
   final String id;
   final String originalTabId;
   final String customerName;
   final DateTime closedAt;
-  final String paymentMethod;
+final PaymentMethod paymentMethod;
-  final List<ClosedTabItem> items;
 
-  ClosedTab({
+  final List<ClosedTabItem> items;
+  const ClosedTab({
     required this.id,
     required this.originalTabId,
     required this.customerName,
@@ -27,13 +29,7 @@ class ClosedTab {
   String get formattedTotal =>
       NumberFormat.simpleCurrency().format(totalInCents / 100);
 
-  String get formattedPaymentMethod {
+  String get formattedPaymentMethod => paymentMethod.label;
-    return switch (paymentMethod) {
-      'cash' => 'Cash',
-      'payconiq' => 'Payconiq',
-      _ => 'Cash',
-    };
-  }
 
   @override
   bool operator ==(Object other) =>
@@ -44,7 +40,7 @@ class ClosedTab {
           customerName == other.customerName &&
           closedAt == other.closedAt &&
           paymentMethod == other.paymentMethod &&
-          _listEquals(items, other.items);
+          listEquals(items, other.items);
 
   @override
   int get hashCode => Object.hash(
@@ -57,12 +53,4 @@ class ClosedTab {
       );
 }
 
-bool _listEquals<T>(List<T>? a, List<T>? b) {
+// _listEquals moved to utils/collection_utils.dart
-  if (identical(a, b)) return true;
-  if (a == null || b == null) return a == b;
-  if (a.length != b.length) return false;
-  for (int i = 0; i < a.length; i++) {
-    if (a[i] != b[i]) return false;
-  }
-  return true;
-}

lib/models/payment_method.dart

@@ -0,0 +1,15 @@
+enum PaymentMethod {
+  cash('cash', 'Cash', 'Cash payment'),
+  payconiq('payconiq', 'Payconiq', 'Payconiq QR payment');
+
+  final String value;
+  final String label;
+  final String description;
+
+  const PaymentMethod(this.value, this.label, this.description);
+
+  static PaymentMethod fromValue(String value) => PaymentMethod.values.firstWhere(
+        (e) => e.value == value,
+        orElse: () => PaymentMethod.cash,
+      );
+}

lib/services/bar_tab_service.dart

@@ -5,6 +5,7 @@ import '../database/app_database.dart';
 import '../models/bar_tab.dart';
 import '../models/closed_tab.dart';
 import '../models/closed_tab_item.dart';
+import '../models/payment_method.dart';
 import '../models/product.dart';
 import '../models/tab_item.dart';
 
@@ -29,7 +30,7 @@ abstract class BarTabService {
 
   /// Archives the tab's current items into history and clears them.
   /// The tab itself stays open under the same customer name.
-  Future<void> closeTab(String tabId, {String paymentMethod = 'cash'});
+  Future<void> closeTab(String tabId, {PaymentMethod paymentMethod = PaymentMethod.cash});
 
   Future<List<ClosedTab>> getClosedTabs();
 
@@ -234,7 +235,7 @@ class DriftBarTabService implements BarTabService {
   }
 
   @override
-  Future<void> closeTab(String tabId, {String paymentMethod = 'cash'}) async {
+  Future<void> closeTab(String tabId, {PaymentMethod paymentMethod = PaymentMethod.cash}) async {
     await database.transaction(() async {
       final tabQuery = database.select(database.barTabs)
         ..where((tab) => tab.id.equals(tabId));
@@ -261,7 +262,7 @@ class DriftBarTabService implements BarTabService {
               originalTabId: tabId,
               customerName: tabRow.customerName,
               closedAt: DateTime.now(),
-              paymentMethod: Value(paymentMethod),
+              paymentMethod: Value(paymentMethod.value),
             ),
           );
 
@@ -326,7 +327,7 @@ class DriftBarTabService implements BarTabService {
           originalTabId: row.originalTabId,
           customerName: row.customerName,
           closedAt: row.closedAt,
-          paymentMethod: row.paymentMethod,
+          paymentMethod: PaymentMethod.fromValue(row.paymentMethod),
           items: itemRows.map<ClosedTabItem>(_mapClosedItemRow).toList(),
         ),
       );

lib/utils/app_update_util.dart

@@ -83,101 +83,4 @@ class AppUpdateUtil {
 
     return UpdateInfo.fromJson(data);
   }
-
-  // /// Downloads the APK
-  // Future<File> downloadApk(
-  //   UpdateInfo update, {
-  //
-  //   Function(double progress)? onProgress,
-  // }) async {
-  //   final url = update.download.startsWith("http")
-  //       ? update.download
-  //       : "$serverUrl${update.download}";
-  //
-  //   final request = http.Request("GET", Uri.parse(url));
-  //
-  //   final response = await request.send();
-  //
-  //   if (response.statusCode != 200) {
-  //     throw Exception("APK download failed");
-  //   }
-  //
-  //   final total = response.contentLength ?? 0;
-  //
-  //   int received = 0;
-  //
-  //   final directory = await getTemporaryDirectory();
-  //
-  //   final file = File("${directory.path}/update.apk");
-  //
-  //   final sink = file.openWrite();
-  //
-  //   await for (final chunk in response.stream) {
-  //     sink.add(chunk);
-  //
-  //     received += chunk.length;
-  //
-  //     if (total > 0 && onProgress != null) {
-  //       onProgress(received / total);
-  //     }
-  //   }
-  //
-  //   await sink.close();
-  //
-  //   return file;
-  // }
-  //
-  // /// Verifies APK checksum
-  // Future<bool> verifySha256(File file, String expectedHash) async {
-  //   final bytes = await file.readAsBytes();
-  //
-  //   final digest = sha256.convert(bytes);
-  //
-  //   return digest.toString().toLowerCase() == expectedHash.toLowerCase();
-  // }
-  //
-  // /// Opens Android APK installer
-  // Future<void> installApk(File file) async {
-  //   final result =
-  //   await OpenFilex.open(
-  //     file.path,
-  //   );
-  //
-  //   if(result.type == ResultType.done) {
-  //     debugPrint("APK installer opened successfully");
-  //   }
-  //
-  //
-  //   if (result.type != ResultType.done) {
-  //     throw Exception(
-  //       "Could not open APK installer",
-  //     );
-  //   }
-  // }
-  //
-  // /// Full update flow
-  // ///
-  // /// Returns:
-  // /// - null if no update exists
-  // /// - UpdateInfo if update is available
-  // ///
-  // Future<UpdateInfo?> update({Function(double progress)? onProgress}) async {
-  //   final info = await checkForUpdate();
-  //
-  //   if (info == null) {
-  //     return null;
-  //   }
-  //
-  //   final apk = await downloadApk(info, onProgress: onProgress);
-  //
-  //   final valid = await verifySha256(apk, info.sha256);
-  //
-  //   if (!valid) {
-  //     throw Exception("APK checksum mismatch");
-  //   }
-  //
-  //   await installApk(apk);
-  //
-  //   return info;
-  // }
 }

lib/utils/collection_utils.dart

@@ -0,0 +1,9 @@
+bool listEquals<T>(List<T>? a, List<T>? b) {
+  if (identical(a, b)) return true;
+  if (a == null || b == null) return a == b;
+  if (a.length != b.length) return false;
+  for (int i = 0; i < a.length; i++) {
+    if (a[i] != b[i]) return false;
+  }
+  return true;
+}

lib/viewmodels/bar_screen_view_model.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 
+import '../models/payment_method.dart';
 import '../models/bar_tab.dart';
 import '../models/product.dart';
 import '../models/tab_item.dart';
@@ -33,7 +34,8 @@ class BarScreenViewModel extends ChangeNotifier {
 
     try {
       return _tabs.firstWhere((tab) => tab.id == _selectedTabId);
-    } catch (_) {
+    } catch (e) {
+      debugPrint('BarScreenViewModel: error finding selected tab: $e');
       return null;
     }
   }
@@ -58,7 +60,8 @@ class BarScreenViewModel extends ChangeNotifier {
           !_tabs.any((tab) => tab.id == _selectedTabId)) {
         _selectedTabId = _tabs.isEmpty ? null : _tabs.first.id;
       }
-    } catch (_) {
+    } catch (e) {
+      debugPrint('BarScreenViewModel: load error: $e');
       _errorMessage = 'Could not load bar screen.';
     } finally {
       _hasLoaded = true;
@@ -115,7 +118,7 @@ class BarScreenViewModel extends ChangeNotifier {
     await _reloadTabs();
   }
 
-  Future<void> closeSelectedTab({String paymentMethod = 'cash'}) async {
+  Future<void> closeSelectedTab({PaymentMethod paymentMethod = PaymentMethod.cash}) async {
     final tab = selectedTab;
 
     if (tab == null) return;
@@ -125,7 +128,7 @@ class BarScreenViewModel extends ChangeNotifier {
     await _reloadTabs();
   }
 
-  Future<void> closeTab(String tabId, {String paymentMethod = 'cash'}) async {
+  Future<void> closeTab(String tabId, {PaymentMethod paymentMethod = PaymentMethod.cash}) async {
     await barTabService.closeTab(tabId, paymentMethod: paymentMethod);
 
     await _reloadTabs();

lib/viewmodels/dev_menu_view_model.dart

@@ -2,6 +2,7 @@ import 'package:flutter/foundation.dart';
 import 'package:drift/drift.dart';
 import 'package:kooltab2/database/app_database.dart';
 import 'package:kooltab2/services/bar_tab_service.dart';
+import 'package:kooltab2/models/payment_method.dart';
 import 'package:kooltab2/services/pin_lock_service.dart';
 import 'package:kooltab2/services/product_service.dart';
 import 'package:kooltab2/services/settings_service.dart';
@@ -275,7 +276,7 @@ class DevMenuViewModel extends ChangeNotifier {
         'Sam', 'Tina', 'Umar', 'Vera', 'Wes', 'Xena',
         'Yves', 'Zara',
       ];
-      const paymentMethods = ['cash', 'payconiq'];
+      const paymentMethods = [PaymentMethod.cash, PaymentMethod.payconiq];
 
       await database.transaction(() async {
         for (var i = 0; i < count; i++) {
@@ -297,7 +298,7 @@ class DevMenuViewModel extends ChangeNotifier {
               originalTabId: uuid.v4(),
               customerName: customer,
               closedAt: closedAt,
-              paymentMethod: Value(paymentMethods[(i * 3) % paymentMethods.length]),
+              paymentMethod: Value(paymentMethods[(i * 3) % paymentMethods.length].value),
             ),
           );
 

lib/viewmodels/history_view_model.dart

@@ -73,7 +73,8 @@ class HistoryViewModel extends ChangeNotifier {
       _totalCount = results[1] as int;
       _customerNames = results[2] as List<String>;
       _offset = _closedTabs.length;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('HistoryViewModel: load error: $e');
       _errorMessage = 'Could not load tab history.';
     } finally {
       _hasLoaded = true;
@@ -92,7 +93,8 @@ class HistoryViewModel extends ChangeNotifier {
       final more = await _fetchPage(offset: _offset);
       _closedTabs = [..._closedTabs, ...more];
       _offset = _closedTabs.length;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('HistoryViewModel: loadMore error: $e');
       _errorMessage = 'Could not load more tabs.';
     } finally {
       _isLoadingMore = false;

lib/viewmodels/pin_lock_view_model.dart

@@ -56,7 +56,8 @@ class PinLockViewModel extends ChangeNotifier {
         final settings = await svc.getSettings();
         _pinRequired = settings.pinRequired;
       }
-    } catch (_) {
+    } catch (e) {
+      debugPrint('PinLockViewModel: load error: $e');
       _errorMessage = 'Could not check PIN status.';
     } finally {
       _hasLoaded = true;
@@ -85,7 +86,8 @@ class PinLockViewModel extends ChangeNotifier {
 
       notifyListeners();
       return true;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('PinLockViewModel: setPin error: $e');
       _errorMessage = 'Could not save PIN.';
       notifyListeners();
       return false;
@@ -108,7 +110,8 @@ class PinLockViewModel extends ChangeNotifier {
       _errorMessage = 'Incorrect PIN.';
       notifyListeners();
       return false;
-    } catch (_) {
+    } catch (e) {
+      debugPrint('PinLockViewModel: verify error: $e');
       _errorMessage = 'Could not verify PIN.';
       notifyListeners();
       return false;

lib/viewmodels/product_list_view_model.dart

@@ -48,27 +48,14 @@ class ProductListViewModel extends ChangeNotifier {
 
     try {
       await inventory.load();
-    } catch (_) {
+    } catch (e) {
+      debugPrint('ProductListViewModel: load error: $e');
       _errorMessage = 'Could not load products.';
     } finally {
       _hasLoaded = true;
       _isLoading = false;
       notifyListeners();
     }
-
-    // try {
-    //   _products = await productService.getProducts();
-    //
-    //   debugPrint(
-    //     _products.map((p) => '${p.name}: ${p.stockQuantity}').join('\n'),
-    //   );
-    // } catch (_) {
-    //   _errorMessage = 'Could not load products.';
-    // } finally {
-    //   _hasLoaded = true;
-    //   _isLoading = false;
-    //   notifyListeners();
-    // }
   }
 
   Future<void> addProduct({

lib/viewmodels/settings_view_model.dart

@@ -44,7 +44,8 @@ class SettingsViewModel extends ChangeNotifier {
 
     try {
       _settings = await settingsService.getSettings();
-    } catch (_) {
+    } catch (e) {
+      debugPrint('SettingsViewModel: load error: $e');
       _errorMessage = 'Could not load settings.';
     } finally {
       _hasLoaded = true;
@@ -118,7 +119,8 @@ class SettingsViewModel extends ChangeNotifier {
 
     try {
       await settingsService.saveSettings(updated);
-    } catch (_) {
+    } catch (e) {
+      debugPrint('SettingsViewModel: save error: $e');
       _settings = previous;
       _errorMessage = 'Could not save settings.';
       notifyListeners();

lib/views/bar_screen_view.dart

@@ -125,7 +125,14 @@ class _BarScreenViewState extends State<BarScreenView> {
                       return;
                     }
 
+                    try {
                       await viewModel.addProductToSelectedTab(product);
+                    } catch (e) {
+                      if (!context.mounted) return;
+                      ScaffoldMessenger.of(context).showSnackBar(
+                        SnackBar(content: Text('$e')),
+                      );
+                    }
                   },
                 ),
               ),

lib/views/dialogs/close_tab_dialog.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:flutter_svg/svg.dart';
 import 'package:provider/provider.dart';
 
+import '../../models/payment_method.dart';
 import '../../viewmodels/bar_screen_view_model.dart';
 import '../widgets/slide_confirm.dart';
 
@@ -11,7 +12,7 @@ Future<void> confirmCloseTab(BuildContext context) async {
 
   if (tab == null) return;
 
-  String paymentMethod = 'cash';
+  PaymentMethod paymentMethod = PaymentMethod.cash;
 
   final confirmed = await showDialog<bool>(
     context: context,
@@ -66,8 +67,8 @@ Future<void> confirmCloseTab(BuildContext context) async {
 }
 
 class _PaymentPicker extends StatelessWidget {
-  final String selected;
+  final PaymentMethod selected;
-  final ValueChanged<String> onChanged;
+  final ValueChanged<PaymentMethod> onChanged;
 
   const _PaymentPicker({
     required this.selected,
@@ -75,8 +76,8 @@ class _PaymentPicker extends StatelessWidget {
   });
 
   static const _options = [
-    ('cash', 'Cash'),
+    (PaymentMethod.cash, 'Cash'),
-    ('payconiq', 'Payconiq'),
+    (PaymentMethod.payconiq, 'Payconiq'),
   ];
 
   @override
@@ -96,7 +97,7 @@ class _PaymentPicker extends StatelessWidget {
             label: Row(
               mainAxisSize: MainAxisSize.min,
               children: [
-                if (value == 'cash')
+                if (value == PaymentMethod.cash)
                   const Icon(
                     Icons.attach_money,
                     size: 16,

lib/views/widgets/closed_tab_card.dart

@@ -2,6 +2,7 @@ import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 import 'package:kooltab2/models/closed_tab.dart';
 import 'package:kooltab2/models/closed_tab_item.dart';
+import 'package:kooltab2/models/payment_method.dart';
 
 class ClosedTabCard extends StatefulWidget {
   final ClosedTab closedTab;
@@ -15,10 +16,10 @@ class ClosedTabCard extends StatefulWidget {
 class _ClosedTabCardState extends State<ClosedTabCard> {
   bool _expanded = false;
 
-  IconData _paymentIcon(String method) {
+  IconData _paymentIcon(PaymentMethod method) {
     return switch (method) {
-      'payconiq' => Icons.qr_code_rounded,
+      PaymentMethod.payconiq => Icons.qr_code_rounded,
-      _ => Icons.money_rounded,
+      PaymentMethod.cash => Icons.money_rounded,
     };
   }