Implement auto-update checking logic and dashboard banner UI

Author: byteWizard-zero

lib/controllers/billing_controller.dart

@@ -38,6 +38,7 @@ class BillingController extends ChangeNotifier {
   BillingController() {
     _initDatabase();
     _checkPrinterStatus();
+    checkForUpdates();
   }
 
   Future<void> _initDatabase() async {
@@ -454,4 +455,96 @@ class BillingController extends ChangeNotifier {
       ),
     ) ?? false;
   }
+
+  // 🚀 Auto-Update Feature Variables
+  static const String appVersion = "1.2.0"; // Current App Version
+  
+  bool _hasUpdate = false;
+  bool get hasUpdate => _hasUpdate;
+  
+  bool _isCheckingUpdate = false;
+  bool get isCheckingUpdate => _isCheckingUpdate;
+  
+  String _latestVersion = "";
+  String get latestVersion => _latestVersion;
+  
+  String _updateDownloadUrl = "";
+  String get updateDownloadUrl => _updateDownloadUrl;
+  
+  String _updateReleaseNotes = "";
+  String get updateReleaseNotes => _updateReleaseNotes;
+
+  Future<void> checkForUpdates() async {
+    _isCheckingUpdate = true;
+    notifyListeners();
+
+    try {
+      // First try cartsnap repository URL
+      var response = await http.get(
+        Uri.parse('https://api.github.com/repos/1bitVscoder/cartsnap/releases/latest'),
+      ).timeout(const Duration(seconds: 5));
+
+      // Fallback to old smart_billing_app URL if cartsnap repository doesn't exist yet
+      if (response.statusCode == 404) {
+        response = await http.get(
+          Uri.parse('https://api.github.com/repos/1bitVscoder/smart_billing_app/releases/latest'),
+        ).timeout(const Duration(seconds: 5));
+      }
+
+      if (response.statusCode == 200) {
+        final data = jsonDecode(response.body);
+        final String tag = data['tag_name'] ?? "";
+        
+        if (tag.isNotEmpty && _isNewerVersion(tag, appVersion)) {
+          _hasUpdate = true;
+          _latestVersion = tag;
+          _updateReleaseNotes = data['body'] ?? "No release notes provided.";
+          
+          // Try to find apk asset in the assets list
+          final assets = data['assets'] as List?;
+          if (assets != null && assets.isNotEmpty) {
+            final apkAsset = assets.firstWhere(
+              (asset) => asset['name'].toString().toLowerCase().endsWith('.apk'),
+              orElse: () => null,
+            );
+            if (apkAsset != null) {
+              _updateDownloadUrl = apkAsset['browser_download_url'] ?? "";
+            }
+          }
+          
+          // If no specific APK found, fall back to the release HTML page
+          if (_updateDownloadUrl.isEmpty) {
+            _updateDownloadUrl = data['html_url'] ?? "";
+          }
+        }
+      }
+    } catch (e) {
+      debugPrint("Auto-update check exception: $e");
+    } finally {
+      _isCheckingUpdate = false;
+      notifyListeners();
+    }
+  }
+
+  bool _isNewerVersion(String latest, String current) {
+    final cleanLatest = latest.replaceAll(RegExp(r'[a-zA-Z]'), '').trim();
+    final cleanCurrent = current.replaceAll(RegExp(r'[a-zA-Z]'), '').trim();
+    
+    List<int> latestParts = cleanLatest.split('.').map((e) => int.tryParse(e) ?? 0).toList();
+    List<int> currentParts = cleanCurrent.split('.').map((e) => int.tryParse(e) ?? 0).toList();
+    
+    int maxLength = latestParts.length > currentParts.length ? latestParts.length : currentParts.length;
+    for (int i = 0; i < maxLength; i++) {
+      int latestVal = i < latestParts.length ? latestParts[i] : 0;
+      int currentVal = i < currentParts.length ? currentParts[i] : 0;
+      if (latestVal > currentVal) return true;
+      if (latestVal < currentVal) return false;
+    }
+    return false;
+  }
+  
+  void dismissUpdateNotification() {
+    _hasUpdate = false;
+    notifyListeners();
+  }
 }

lib/views/dashboard_view.dart

@@ -115,7 +115,9 @@ class _DashboardViewState extends State<DashboardView> with SingleTickerProvider
                     'What are we\nselling today?',
                     style: TextStyle(fontSize: 32, fontWeight: FontWeight.bold, height: 1.2, letterSpacing: -1),
                   ),
-                  const SizedBox(height: 32),
+                  const SizedBox(height: 16),
+                  _buildUpdateBanner(billingController),
+                  const SizedBox(height: 16),
 
                   Expanded(
                     child: GridView.count(
@@ -480,6 +482,67 @@ class _DashboardViewState extends State<DashboardView> with SingleTickerProvider
     );
   }
 
+  Widget _buildUpdateBanner(BillingController controller) {
+    if (!controller.hasUpdate) return const SizedBox.shrink();
+
+    return Container(
+      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
+      decoration: BoxDecoration(
+        gradient: const LinearGradient(
+          colors: [Color(0xFF2F80ED), Color(0xFF56CCF2)],
+          begin: Alignment.topLeft,
+          end: Alignment.bottomRight,
+        ),
+        borderRadius: BorderRadius.circular(20),
+        boxShadow: [
+          BoxShadow(
+            color: const Color(0xFF2F80ED).withOpacity(0.3),
+            blurRadius: 10,
+            offset: const Offset(0, 4),
+          ),
+        ],
+      ),
+      child: Row(
+        children: [
+          const Icon(Icons.rocket_launch_rounded, color: Colors.white, size: 24),
+          const SizedBox(width: 12),
+          Expanded(
+            child: Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(
+                  "Update Available! (${controller.latestVersion})",
+                  style: const TextStyle(color: Colors.white, fontWeight: FontWeight.bold, fontSize: 14),
+                ),
+                const SizedBox(height: 2),
+                Text(
+                  "New features are ready. Tap to download.",
+                  style: TextStyle(color: Colors.white.withOpacity(0.9), fontSize: 11),
+                ),
+              ],
+            ),
+          ),
+          ElevatedButton(
+            onPressed: () => _redirectToPlatform(controller.updateDownloadUrl),
+            style: ElevatedButton.styleFrom(
+              backgroundColor: Colors.white,
+              foregroundColor: const Color(0xFF2F80ED),
+              elevation: 0,
+              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 8),
+              shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+            ),
+            child: const Text("Get", style: TextStyle(fontWeight: FontWeight.bold, fontSize: 12)),
+          ),
+          const SizedBox(width: 4),
+          IconButton(
+            icon: const Icon(Icons.close_rounded, color: Colors.white70, size: 20),
+            onPressed: () => controller.dismissUpdateNotification(),
+          ),
+        ],
+      ),
+    );
+  }
+
   Widget _buildBentoCard({
     required String title,
     required String value,