third commit

lib/data/datasources/remote_catalogue_source.dart

@@ -36,15 +36,19 @@ class CatalogueSyncException implements Exception {
 /// The real implementation would issue an HTTP request; the contract is the
 /// same, so only this class changes.
 class RemoteCatalogueSource {
-  RemoteCatalogueSource() {
+  RemoteCatalogueSource({required this.isOffline}) {
     LocalStore.registerSeed(
       products: SeedData.products,
       customers: SeedData.customers,
     );
   }
 
-  /// Flipped from Settings to exercise the offline path.
-  bool simulateOffline = false;
+  /// Reads the Settings switch on every call.
+  ///
+  /// Deliberately a callback rather than a stored bool: a copied flag can fall
+  /// out of step with the switch, which makes the terminal behave as offline
+  /// while showing that it is not.
+  final bool Function() isOffline;
 
   /// Streams progress so the import screen can show a real bar rather than an
   /// indeterminate spinner.
@@ -62,10 +66,10 @@ class RemoteCatalogueSource {
     for (final (progress, stage) in stages) {
       await Future<void>.delayed(const Duration(milliseconds: 320));
 
-      if (simulateOffline) {
+      if (isOffline()) {
         throw const CatalogueSyncException(
-          'No connection to the catalogue server. '
-          'Check the network and try again.',
+          'Simulate offline is ON in Settings, so the catalogue pull was '
+          'failed on purpose. Turn it off to import.',
         );
       }
 
@@ -83,9 +87,9 @@ class RemoteCatalogueSource {
 
 /// Stands in for the back-office order intake API.
 class RemoteOrderSink {
-  RemoteOrderSink();
+  RemoteOrderSink({required this.isOffline});
 
-  bool simulateOffline = false;
+  final bool Function() isOffline;
 
   /// Uploads a batch of orders and returns the ids the server accepted.
   ///
@@ -96,10 +100,10 @@ class RemoteOrderSink {
       Duration(milliseconds: 400 + orders.length * 60),
     );
 
-    if (simulateOffline) {
+    if (isOffline()) {
       throw const CatalogueSyncException(
-        'Could not reach the order server. Every bill is still stored on '
-        'this terminal and will upload on the next attempt.',
+        'Simulate offline is ON in Settings, so the upload was failed on '
+        'purpose. Every bill is still stored on this terminal.',
       );
     }
 

lib/data/datasources/seed_data.dart

@@ -22,6 +22,7 @@ class SeedData {
           emoji: '🥛',
           unit: UnitOfMeasure.litre,
           gstRate: 0.05,
+          hsnCode: '0401',
           brand: 'Amul',
         ),
         Product(
@@ -35,6 +36,7 @@ class SeedData {
           stock: 30,
           emoji: '🧈',
           gstRate: 0.12,
+          hsnCode: '0405',
           brand: 'Amul',
         ),
         Product(
@@ -48,6 +50,7 @@ class SeedData {
           stock: 40,
           emoji: '🥣',
           gstRate: 0.05,
+          hsnCode: '0403',
           brand: 'Nandini',
         ),
         Product(
@@ -60,6 +63,7 @@ class SeedData {
           stock: 20,
           emoji: '🧀',
           gstRate: 0.05,
+          hsnCode: '0406',
           brand: 'Milky Mist',
         ),
         Product(
@@ -73,6 +77,7 @@ class SeedData {
           stock: 25,
           emoji: '🧀',
           gstRate: 0.12,
+          hsnCode: '0406',
           brand: 'Britannia',
         ),
 
@@ -89,6 +94,7 @@ class SeedData {
           emoji: '🍚',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0.05,
+          hsnCode: '1006',
           brand: 'India Gate',
         ),
         Product(
@@ -103,6 +109,7 @@ class SeedData {
           emoji: '🛢️',
           unit: UnitOfMeasure.litre,
           gstRate: 0.05,
+          hsnCode: '1507',
           brand: 'Fortune',
         ),
         Product(
@@ -115,6 +122,7 @@ class SeedData {
           stock: 45,
           emoji: '🫘',
           gstRate: 0.05,
+          hsnCode: '0713',
           brand: 'Tata Sampann',
         ),
         Product(
@@ -129,6 +137,7 @@ class SeedData {
           emoji: '🌾',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0.05,
+          hsnCode: '1101',
           brand: 'Aashirvaad',
         ),
         Product(
@@ -142,6 +151,7 @@ class SeedData {
           emoji: '🍬',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0.05,
+          hsnCode: '1701',
         ),
         Product(
           id: 'p015',
@@ -153,6 +163,7 @@ class SeedData {
           stock: 120,
           emoji: '🍜',
           gstRate: 0.12,
+          hsnCode: '1902',
           brand: 'Nestlé',
         ),
         Product(
@@ -166,6 +177,7 @@ class SeedData {
           emoji: '🧂',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0.05,
+          hsnCode: '2501',
           brand: 'Tata',
         ),
 
@@ -181,6 +193,7 @@ class SeedData {
           emoji: '🥤',
           unit: UnitOfMeasure.millilitre,
           gstRate: 0.28,
+          hsnCode: '2202',
           brand: 'Coca-Cola',
         ),
         Product(
@@ -193,6 +206,7 @@ class SeedData {
           stock: 100,
           emoji: '🥭',
           gstRate: 0.12,
+          hsnCode: '2202',
           brand: 'Parle Agro',
         ),
         Product(
@@ -206,6 +220,7 @@ class SeedData {
           emoji: '💧',
           unit: UnitOfMeasure.litre,
           gstRate: 0.18,
+          hsnCode: '2201',
           brand: 'Bisleri',
         ),
         Product(
@@ -218,6 +233,7 @@ class SeedData {
           stock: 40,
           emoji: '🔋',
           gstRate: 0.28,
+          hsnCode: '2202',
           brand: 'Red Bull',
         ),
         Product(
@@ -231,6 +247,7 @@ class SeedData {
           stock: 30,
           emoji: '☕',
           gstRate: 0.18,
+          hsnCode: '2101',
           brand: 'Bru',
         ),
 
@@ -245,6 +262,7 @@ class SeedData {
           stock: 90,
           emoji: '🍪',
           gstRate: 0.18,
+          hsnCode: '1905',
           brand: 'Parle',
         ),
         Product(
@@ -257,6 +275,7 @@ class SeedData {
           stock: 110,
           emoji: '🥔',
           gstRate: 0.18,
+          hsnCode: '2005',
           brand: "Lay's",
         ),
         Product(
@@ -269,6 +288,7 @@ class SeedData {
           stock: 75,
           emoji: '🍫',
           gstRate: 0.18,
+          hsnCode: '1806',
           brand: 'Cadbury',
         ),
         Product(
@@ -281,6 +301,7 @@ class SeedData {
           stock: 85,
           emoji: '🍪',
           gstRate: 0.18,
+          hsnCode: '1905',
           brand: 'Britannia',
         ),
         Product(
@@ -293,6 +314,7 @@ class SeedData {
           stock: 60,
           emoji: '🥜',
           gstRate: 0.12,
+          hsnCode: '2106',
           brand: 'Haldiram',
         ),
 
@@ -308,6 +330,7 @@ class SeedData {
           stock: 55,
           emoji: '🪥',
           gstRate: 0.18,
+          hsnCode: '3306',
           brand: 'Colgate',
         ),
         Product(
@@ -320,6 +343,7 @@ class SeedData {
           stock: 70,
           emoji: '🧼',
           gstRate: 0.18,
+          hsnCode: '3401',
           brand: 'Dove',
         ),
         Product(
@@ -333,6 +357,7 @@ class SeedData {
           stock: 25,
           emoji: '🧴',
           gstRate: 0.18,
+          hsnCode: '3305',
           brand: 'P&G',
         ),
         Product(
@@ -345,6 +370,7 @@ class SeedData {
           stock: 30,
           emoji: '🧴',
           gstRate: 0.18,
+          hsnCode: '3304',
           brand: 'Nivea',
         ),
 
@@ -361,6 +387,7 @@ class SeedData {
           emoji: '🧺',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0.18,
+          hsnCode: '3402',
           brand: 'Surf Excel',
         ),
         Product(
@@ -373,6 +400,7 @@ class SeedData {
           stock: 90,
           emoji: '🧽',
           gstRate: 0.18,
+          hsnCode: '3401',
           brand: 'Vim',
         ),
         Product(
@@ -385,6 +413,7 @@ class SeedData {
           stock: 40,
           emoji: '🧴',
           gstRate: 0.18,
+          hsnCode: '3402',
           brand: 'Harpic',
         ),
         Product(
@@ -397,6 +426,7 @@ class SeedData {
           stock: 35,
           emoji: '🗑️',
           gstRate: 0.18,
+          hsnCode: '3923',
         ),
 
         // ----------------------------------------------------------- Fruits
@@ -411,6 +441,7 @@ class SeedData {
           emoji: '🍌',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0803',
         ),
         Product(
           id: 'p061',
@@ -423,6 +454,7 @@ class SeedData {
           emoji: '🍎',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0808',
         ),
         Product(
           id: 'p062',
@@ -435,6 +467,7 @@ class SeedData {
           emoji: '🥭',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0804',
         ),
 
         // ------------------------------------------------------- Vegetables
@@ -449,6 +482,7 @@ class SeedData {
           emoji: '🍅',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0702',
         ),
         Product(
           id: 'p071',
@@ -461,6 +495,7 @@ class SeedData {
           emoji: '🧅',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0703',
         ),
         Product(
           id: 'p072',
@@ -473,6 +508,7 @@ class SeedData {
           emoji: '🥔',
           unit: UnitOfMeasure.kilogram,
           gstRate: 0,
+          hsnCode: '0701',
         ),
         Product(
           id: 'p073',
@@ -484,6 +520,7 @@ class SeedData {
           stock: 8,
           emoji: '🥕',
           gstRate: 0,
+          hsnCode: '0706',
         ),
       ];