add username validation

Frontend/patient_manager/lib/components/myTextInput.dart

@@ -33,17 +33,36 @@ class _MyTextFieldState extends State<MyTextField> {
 
   String? get _errorText {
     final text = widget.controller.text;
+    String _errorMessage = '';
     if (startup) {
       return null;
-    } else if (!widget.required) {
-      return null;
-    } else if (text.isEmpty) {
-      return "${widget.hintText} is required";
-    } else if (widget.hintText == "Email" && !isEmailValid(text)) {
-      return "Enter a valid email address";
     }
+    if (!widget.required) {
       return null;
     }
+    if (text.isEmpty) {
+      return "${widget.hintText} is required";
+    }
+    if (widget.hintText == "Email" && !isEmailValid(text)) {
+      _errorMessage += "Enter a valid email address\n";
+    }
+    if (widget.hintText == "Username" && text.length < 8) {
+      _errorMessage += "• Username must contain at least 8 characters.\n";
+    }
+    if (widget.hintText == "Username" && !isUsernameValid(text)) {
+      _errorMessage += "• Username can only contain '_' special Chracters.\n";
+    }
+    if (_errorMessage.isEmpty) {
+      return null;
+    }
+    // If there are no error messages, the password is valid
+    return _errorMessage;
+  }
+
+  bool isUsernameValid(String Username) {
+    return RegExp(r'^(?=[a-zA-Z0-9._]{8,20}$)(?!.*[_.]{2})[^_.].*[^_.]$')
+        .hasMatch(Username);
+  }
 
   bool isEmailValid(String email) {
     return RegExp(r'^[\w-\.]+@[a-zA-Z]+\.[a-zA-Z]{2,}$').hasMatch(email);

Frontend/patient_manager/lib/components/profileUserUpdate.dart

@@ -1,6 +1,7 @@
 import 'dart:convert';
 
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:patient_manager/components/myErrorMessage.dart';
 import 'package:patient_manager/components/mySuccessMessage.dart';
 import 'package:patient_manager/components/myTextInput.dart';
@@ -27,6 +28,7 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
   final fnameController = TextEditingController();
   final lnameController = TextEditingController();
   late bool businessUser;
+  final FocusNode _focusNode = FocusNode();
 
   bool isFieldsFilled() {
     if (fnameController.text.isEmpty ||
@@ -52,7 +54,10 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
     } else {
       profileType = "personal";
     }
-
+    print("is username valid ${isUsernameValid(usernameController.text)}");
+    if (isUsernameValid(usernameController.text) == false) {
+      usernamePopUp();
+    } else {
       var response = await http.put(
         Uri.parse("${AppEnviroment.baseApiUrl}/user/update/"),
         headers: <String, String>{
@@ -78,6 +83,7 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
         internetConnectionPopUp();
       }
     }
+  }
 
   bool isBusinessUser() {
     if (widget.signedInUser.type == "personal") {
@@ -108,6 +114,33 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
     );
   }
 
+  void usernamePopUp() {
+    showDialog(
+      context: context,
+      builder: (context) {
+        return const MyErrorMessage(errorType: "Invalid Username");
+      },
+    );
+  }
+
+  bool isUsernameValid(String username) {
+    return RegExp(r'^(?=[a-zA-Z0-9._]{8,20}$)(?!.*[_.]{2})[^_.].*[^_.]$')
+        .hasMatch(username);
+  }
+
+  void submitForm() {
+    if (isFieldsFilled()) {
+      updateUserApiCall();
+    } else {
+      showDialog(
+        context: context,
+        builder: (context) {
+          return const MyErrorMessage(errorType: "Input Error");
+        },
+      );
+    }
+  }
+
   @override
   void initState() {
     setState(() {
@@ -122,7 +155,16 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
 
   @override
   Widget build(BuildContext context) {
-    return Column(
+    return KeyboardListener(
+      focusNode: _focusNode,
+      autofocus: true,
+      onKeyEvent: (event) async {
+        if (event is KeyDownEvent &&
+            event.logicalKey == LogicalKeyboardKey.enter) {
+          submitForm();
+        }
+      },
+      child: Column(
         children: [
           const Text(
             "Personal profile:",
@@ -158,7 +200,7 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
             crossAxisAlignment: CrossAxisAlignment.center,
             children: [
               const Text(
-              "Activate Business",
+                "Activate Business Account",
                 style: TextStyle(
                   fontWeight: FontWeight.bold,
                   fontSize: 20,
@@ -187,20 +229,12 @@ class _ProfileUserUpdateState extends State<ProfileUserUpdate> {
                   MzanziInnovationHub.of(context)!.theme.secondaryColor(),
               textColor: MzanziInnovationHub.of(context)!.theme.primaryColor(),
               onTap: () {
-              if (isFieldsFilled()) {
-                updateUserApiCall();
-              } else {
-                showDialog(
-                  context: context,
-                  builder: (context) {
-                    return const MyErrorMessage(errorType: "Input Error");
-                  },
-                );
-              }
+                submitForm();
               },
             ),
           ),
         ],
+      ),
     );
   }
 }