feat: add alot

lib/viewmodels/pin_lock_view_model.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 
+import '../models/app_error.dart';
 import '../services/pin_lock_service.dart';
 import '../services/settings_service.dart';
 
@@ -14,7 +15,7 @@ class PinLockViewModel extends ChangeNotifier {
   bool _isLoading = false;
   bool _hasLoaded = false;
   bool _pinRequired = true;
-  String? _errorMessage;
+  AppError? _error;
 
   bool get isPinSet => _isPinSet;
 
@@ -26,7 +27,7 @@ class PinLockViewModel extends ChangeNotifier {
 
   bool get pinRequired => _pinRequired;
 
-  String? get errorMessage => _errorMessage;
+  AppError? get error => _error;
 
   void setPinRequired(bool value) {
     if (_pinRequired == value) return;
@@ -45,7 +46,7 @@ class PinLockViewModel extends ChangeNotifier {
     if (_isLoading) return;
 
     _isLoading = true;
-    _errorMessage = null;
+    _error = null;
     notifyListeners();
 
     try {
@@ -58,7 +59,7 @@ class PinLockViewModel extends ChangeNotifier {
       }
     } catch (e) {
       debugPrint('PinLockViewModel: load error: $e');
-      _errorMessage = 'Could not check PIN status.';
+      _error = AppError.checkPinStatus;
     } finally {
       _hasLoaded = true;
       _isLoading = false;
@@ -67,7 +68,7 @@ class PinLockViewModel extends ChangeNotifier {
   }
 
   Future<bool> setPin(String pin) async {
-    _errorMessage = null;
+    _error = null;
 
     try {
       await pinLockService.setPin(pin);
@@ -85,14 +86,14 @@ class PinLockViewModel extends ChangeNotifier {
       return true;
     } catch (e) {
       debugPrint('PinLockViewModel: setPin error: $e');
-      _errorMessage = 'Could not save PIN.';
+      _error = AppError.savePin;
       notifyListeners();
       return false;
     }
   }
 
   Future<bool> verify(String pin) async {
-    _errorMessage = null;
+    _error = null;
 
     try {
       final matches = await pinLockService.verifyPin(pin);
@@ -103,12 +104,16 @@ class PinLockViewModel extends ChangeNotifier {
         return true;
       }
 
-      _errorMessage = 'Incorrect PIN.';
+      _error = AppError.incorrectPin;
+      notifyListeners();
+      return false;
+    } on PinLockedOutException {
+      _error = AppError.tooManyPinAttempts;
       notifyListeners();
       return false;
     } catch (e) {
       debugPrint('PinLockViewModel: verify error: $e');
-      _errorMessage = 'Could not verify PIN.';
+      _error = AppError.verifyPin;
       notifyListeners();
       return false;
     }
@@ -118,25 +123,13 @@ class PinLockViewModel extends ChangeNotifier {
     required String currentPin,
     required String newPin,
   }) async {
-    final currentMatches = await pinLockService.verifyPin(currentPin);
-
-    if (!currentMatches) {
-      _errorMessage = 'Current PIN is incorrect.';
-      notifyListeners();
-      return false;
-    }
+    if (!await _verifyCurrentPin(currentPin)) return false;
 
     return setPin(newPin);
   }
 
   Future<bool> disablePin(String currentPin) async {
-    final matches = await pinLockService.verifyPin(currentPin);
-
-    if (!matches) {
-      _errorMessage = 'Current PIN is incorrect.';
-      notifyListeners();
-      return false;
-    }
+    if (!await _verifyCurrentPin(currentPin)) return false;
 
     await pinLockService.clearPin();
     _isPinSet = false;
@@ -152,6 +145,18 @@ class PinLockViewModel extends ChangeNotifier {
     return true;
   }
 
+  Future<bool> _verifyCurrentPin(String pin) async {
+    try {
+      if (await pinLockService.verifyPin(pin)) return true;
+      _error = AppError.currentPinIncorrect;
+    } on PinLockedOutException {
+      _error = AppError.tooManyPinAttempts;
+    }
+
+    notifyListeners();
+    return false;
+  }
+
   void lock() {
     if (!_isUnlocked) return;