added design forgot password

lib/view_models/auth_view_model.dart

@@ -13,6 +13,9 @@ class AuthViewModel with ChangeNotifier {
     : _authRepository = authRepository {
     usernameController.addListener(_onTextChanged);
     passwordController.addListener(_onTextChanged);
+    emailController.addListener(_onTextChanged);
+    otpController.addListener(_onTextChanged);
+    newPasswordController.addListener(_onTextChanged);
     // usernameFocus.addListener(_onTextChanged);
     // passwordFocus.addListener(_onTextChanged);
   }
@@ -20,12 +23,18 @@ class AuthViewModel with ChangeNotifier {
   final TextEditingController usernameController = TextEditingController();
   final TextEditingController passwordController = TextEditingController();
   final TextEditingController emailController = TextEditingController();
+  final TextEditingController newPasswordController = TextEditingController();
+  final TextEditingController otpController = TextEditingController();
   final FocusNode usernameFocus = FocusNode();
   final FocusNode passwordFocus = FocusNode();
   final FocusNode emailFocus = FocusNode();
+  final FocusNode newPasswordFocus = FocusNode();
+  final FocusNode otpFocus = FocusNode();
 
   bool _obscurePassword = true;
   bool get obscurePassword => _obscurePassword;
+  bool _obscureForgotPassword = true;
+  bool get obscureForgotPassword => _obscureForgotPassword;
   bool get isLoginEnabled =>
       usernameController.text.isNotEmpty && passwordController.text.isNotEmpty;
 
@@ -43,6 +52,37 @@ class AuthViewModel with ChangeNotifier {
     notifyListeners();
   }
 
+  bool get isEmailValid {
+    final email = emailController.text.trim();
+    final emailRegex = RegExp(r'^[\w-\.]+@([\w-]+\.)+[\w-]{2,4}$');
+    return emailRegex.hasMatch(email);
+  }
+
+  bool get isOtpValid {
+    final otp = otpController.text.trim();
+    return otp.length == 5;
+  }
+
+  bool get canSubmitOtpPage {
+    return isEmailValid && isOtpValid;
+  }
+
+  bool get isNewPasswordValid {
+    final password = newPasswordController.text.trim();
+
+    final hasMinLength = password.length >= 5;
+    final hasUppercase = RegExp(r'[A-Z]').hasMatch(password);
+    final hasLowercase = RegExp(r'[a-z]').hasMatch(password);
+    final hasSpecialChar = RegExp(r'[!@#\$%&\*\^]').hasMatch(password);
+
+    return hasMinLength && hasUppercase && hasLowercase && hasSpecialChar;
+  }
+
+  void toggleForgotPasswordVisibility() {
+    _obscureForgotPassword = !_obscureForgotPassword;
+    notifyListeners();
+  }
+
   void _onTextChanged() {
     notifyListeners();
   }