feat: auto-updater

lib/views/bar_screen_view.dart

@@ -11,11 +11,26 @@ import 'package:flutter_slidable/flutter_slidable.dart';
 import '../models/bar_tab.dart';
 import '../models/product.dart';
 import '../models/tab_item.dart';
+import '../utils/app_updater.dart';
 import '../viewmodels/bar_screen_view_model.dart';
 
-class BarScreenView extends StatelessWidget {
+class BarScreenView extends StatefulWidget {
   const BarScreenView({super.key});
 
+  @override
+  State<BarScreenView> createState() => _BarScreenViewState();
+}
+
+class _BarScreenViewState extends State<BarScreenView> {
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) {
+      UpdateChecker.check(context);
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
     final viewModel = context.watch<BarScreenViewModel>();

lib/views/settings_view.dart

@@ -3,6 +3,7 @@ import 'package:go_router/go_router.dart';
 import 'package:provider/provider.dart';
 
 import '../models/settings.dart';
+import '../utils/app_update_util.dart';
 import '../viewmodels/pin_lock_view_model.dart';
 import '../viewmodels/settings_view_model.dart';
 
@@ -213,12 +214,102 @@ class _SettingsScreenViewState extends State<SettingsScreenView> {
                   ),
                 ],
               ),
+              _SettingsSection(
+                title: 'Updates',
+                children: [
+                  _SettingsTile(
+                    icon: Icons.system_update_alt_rounded,
+                    title: settingsViewModel.checkingForUpdates
+                        ? 'Checking for updates...'
+                        : 'Check for updates',
+                    onTap: settingsViewModel.checkingForUpdates
+                        ? null
+                        : _checkForUpdates,
+                  ),
+                ],
+              ),
             ],
           );
         },
       ),
     );
   }
+
+  Future<void> _checkForUpdates() async {
+    final vm = context.read<SettingsViewModel>();
+
+    try {
+      final update = await vm.checkForUpdates();
+
+      if (!mounted) return;
+
+      if (update == null) {
+        ScaffoldMessenger.of(context).showSnackBar(
+          const SnackBar(
+            content: Text('You are already on the latest version.'),
+          ),
+        );
+        return;
+      }
+
+      _showUpdateDialog(update);
+    } catch (e) {
+      if (!mounted) return;
+
+      ScaffoldMessenger.of(context).showSnackBar(
+        SnackBar(content: Text('Update check failed: $e')),
+      );
+    }
+  }
+
+  void _showUpdateDialog(UpdateInfo update) {
+    showDialog(
+      context: context,
+      barrierDismissible: !update.mandatory,
+      builder: (context) => AlertDialog(
+        title: const Text("Update available"),
+        content: Column(
+          mainAxisSize: MainAxisSize.min,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Text("Version ${update.version} is available."),
+            const SizedBox(height: 12),
+            Text(update.notes),
+          ],
+        ),
+        actions: [
+          if (!update.mandatory)
+            TextButton(
+              onPressed: () => Navigator.pop(context),
+              child: const Text("Later"),
+            ),
+          FilledButton(
+            onPressed: () async {
+              Navigator.pop(context);
+
+              try {
+                await context.read<SettingsViewModel>().installUpdate(
+                  update,
+                  onProgress: (progress) {
+                    debugPrint(
+                      "Download ${(progress * 100).toStringAsFixed(0)}%",
+                    );
+                  },
+                );
+              } catch (e) {
+                if (!mounted) return;
+
+                ScaffoldMessenger.of(context).showSnackBar(
+                  SnackBar(content: Text("Update failed: $e")),
+                );
+              }
+            },
+            child: const Text("Update"),
+          ),
+        ],
+      ),
+    );
+  }
 }
 
 class _SettingsSection extends StatelessWidget {