auth verification of emptiness

client/src/tui/functions/common/login.rs

@@ -21,6 +21,20 @@ pub async fn save(
     let identifier = login_state.username.clone();
     let password = login_state.password.clone();
 
+    // --- Client-side validation ---
+    // Prevent login attempt if the identifier field is empty or whitespace.
+    if identifier.trim().is_empty() {
+        let error_message = "Username/Email cannot be empty.".to_string();
+        app_state.show_dialog(
+            "Login Failed",
+            &error_message,
+            vec!["OK".to_string()],
+            DialogPurpose::LoginFailed,
+        );
+        login_state.error_message = Some(error_message.clone());
+        return Ok(error_message);
+    }
+
     // Clear previous error/dialog state before attempting
     login_state.error_message = None;
     app_state.hide_dialog(); // Hide any previous dialog
@@ -54,6 +68,7 @@ pub async fn save(
                 DialogPurpose::LoginSuccess,
             );
             login_state.password.clear();
+            login_state.username.clear();
             login_state.current_cursor_pos = 0;
             Ok("Login successful, details shown in dialog.".to_string())
         }
@@ -67,6 +82,8 @@ pub async fn save(
             );
             login_state.error_message = Some(error_message.clone());
             login_state.set_has_unsaved_changes(true);
+            login_state.username.clear();
+            login_state.password.clear();
             Ok(format!("Login failed: {}", error_message))
         }
     }