chnages has been made

lib/presentation/screens/face_screen2.dart

@@ -12,10 +12,11 @@ import 'package:google_mlkit_face_detection/google_mlkit_face_detection.dart';
 
 import '../../core/error/exceptions.dart';
 import '../face/face_feedback.dart';
+import 'package:local_auth/local_auth.dart';
 
 class OvalCameraCapturePage extends StatefulWidget {
   final bool isLogin;
-  final Future<void> Function(File image) onCapture;
+  final Future<void> Function(File image, {required bool localAuth}) onCapture;
 
   const OvalCameraCapturePage({
     super.key,
@@ -37,6 +38,13 @@ class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
   bool _isSubmitting = false;
   bool _isStreaming = false;
 
+  //to handel the state of auth when it gives 422 status code
+
+  final LocalAuthentication _localAuth = LocalAuthentication();
+
+  bool _handlingAuth422 = false; // prevents multiple dialogs/auth prompts
+  File? _lastCapturedFile; // keep the same image for retry
+
   // Smart feedback
   FaceFeedback _feedback = FaceFeedback(
     type: FaceHintType.noFace,
@@ -252,6 +260,49 @@ class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
     }
   }
 
+  Future<bool?> _showLocalAuthDialog() {
+    return showDialog<bool>(
+      context: context,
+      barrierDismissible: false,
+      builder:
+          (_) => AlertDialog(
+            title: const Text('فشل التحقق بالوجه', textAlign: TextAlign.center),
+            content: const Text(
+              'لم يتم التعرف على الوجه.\n\nيرجى استخدام بصمة الإصبع أو رمز القفل (PIN/النمط) للمتابعة.',
+              textAlign: TextAlign.center,
+            ),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.pop(context, false),
+                child: const Text('إلغاء'),
+              ),
+              ElevatedButton(
+                onPressed: () => Navigator.pop(context, true),
+                child: const Text('استخدام البصمة / رمز القفل'),
+              ),
+            ],
+          ),
+    );
+  }
+
+  Future<bool> _authenticateLocally() async {
+    try {
+      final isSupported = await _localAuth.isDeviceSupported();
+      if (!isSupported) return false;
+
+      return await _localAuth.authenticate(
+        localizedReason: 'تأكيد هويتك لإكمال تسجيل الحضور.',
+        options: const AuthenticationOptions(
+          biometricOnly: false, // ✅ allows PIN/pattern fallback
+          stickyAuth: true,
+          useErrorDialogs: true,
+        ),
+      );
+    } catch (_) {
+      return false;
+    }
+  }
+
   Future<void> _stopImageStream() async {
     if (!_isStreaming || _cameraController == null) return;
     try {
@@ -408,7 +459,9 @@ class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
       final xFile = await _cameraController!.takePicture();
       final file = File(xFile.path);
 
-      await widget.onCapture(file);
+      _lastCapturedFile = file;
+
+      await widget.onCapture(file, localAuth: false);
 
       if (mounted) {
         setState(() {
@@ -423,8 +476,13 @@ class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
         });
       }
     } on ServerException catch (e) {
-      // Check if this is an "already logged in" error from the API
       final msg = e.message.toLowerCase();
+      // If your ServerException has statusCode, prefer that:
+      if (e.statusCode == 422 || msg.contains('face verification failed')) {
+        await _handleFaceVerificationFailed422(e);
+        return;
+      }
+
       if (msg.contains('already logged in') ||
           msg.contains('مسجل دخول بالفعل')) {
         // Stop camera and go back with a dialog
@@ -545,6 +603,86 @@ class _OvalCameraCapturePageState extends State<OvalCameraCapturePage> {
     return null;
   }
 
+  Future<void> _handleFaceVerificationFailed422(ServerException e) async {
+    if (!mounted) return;
+    if (_handlingAuth422) return;
+
+    _handlingAuth422 = true;
+
+    // stop everything so camera doesn’t keep scanning
+    await _stopImageStream();
+
+    setState(() {
+      _isSubmitting = false;
+      _errorMessage = null;
+      _debugInfo = "Face verification failed (422) → Local Auth...";
+    });
+
+    final proceed = await _showLocalAuthDialog();
+    if (proceed != true) {
+      _handlingAuth422 = false;
+      _stopCameraCompletely();
+      if (!mounted) return;
+
+      // Go back to attendance + show message there
+      Navigator.of(context).pop(false);
+      // If you prefer to show inside this screen before pop:
+      // ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('تم الإلغاء.')));
+      return;
+    }
+
+    final ok = await _authenticateLocally();
+    if (!ok) {
+      _handlingAuth422 = false;
+      _stopCameraCompletely();
+      if (!mounted) return;
+
+      // Return to attendance; attendance screen should show snack "failed fingerprint/pattern"
+      Navigator.of(context).pop("local_auth_failed");
+      return;
+    }
+
+    // Local auth success → retry SAME image with localAuth=true
+    final file = _lastCapturedFile;
+    if (file == null) {
+      _handlingAuth422 = false;
+      _stopCameraCompletely();
+      if (!mounted) return;
+      Navigator.of(context).pop("retry_missing_file");
+      return;
+    }
+
+    setState(() {
+      _isSubmitting = true;
+      _debugInfo = "Local auth success → retrying with localAuth=true...";
+    });
+
+    try {
+      await widget.onCapture(file, localAuth: true);
+
+      if (!mounted) return;
+      setState(() {
+        _isSuccess = true;
+        _isSubmitting = false;
+      });
+
+      Future.delayed(const Duration(seconds: 1), () {
+        if (mounted) Navigator.of(context).pop(true);
+      });
+    } on ServerException catch (e2) {
+      _handlingAuth422 = false;
+      _stopCameraCompletely();
+      if (!mounted) return;
+      // Retry failed → go back to attendance
+      Navigator.of(context).pop("retry_failed");
+    } catch (_) {
+      _handlingAuth422 = false;
+      _stopCameraCompletely();
+      if (!mounted) return;
+      Navigator.of(context).pop("retry_failed");
+    }
+  }
+
   Uint8List _convertYUV420ToNV21(CameraImage image) {
     final int width = image.width;
     final int height = image.height;