Fix: login button doesn't allow multiple connection

src/main/java/it/polimi/ingsw/gc14/View/GUI/LoginFXMLController.java

@@ -95,6 +95,7 @@ public class LoginFXMLController {
             return;
         }
 
+        updateLoginButton(false);
         controller.setMyUsername(nome);
 
         new Thread(() -> {
@@ -103,11 +104,26 @@ public class LoginFXMLController {
                 System.setProperty("java.rmi.server.hostname", localInterface);
                 connect(nome, ip, numPlayers, localInterface);
             } catch (Exception ex) {
-                Platform.runLater(() -> showError("Network error: " + ex.getMessage()));
+                Platform.runLater(() -> {
+                    showError("Network error: " + ex.getMessage());
+                    updateLoginButton(true);
+                });
             }
         }).start();
     }
 
+    private void updateLoginButton(boolean enabled) {
+        btnAccedi.setDisable(!enabled);
+        btnAccedi.setStyle(
+                "-fx-font-family: 'Cinzel'; -fx-font-size: 12; -fx-font-weight: bold;" +
+                "-fx-letter-spacing: 4; -fx-text-fill: #0c0601;" +
+                "-fx-background-color: linear-gradient(to right, #f4c05a, #c8791a, #f4c05a);" +
+                "-fx-padding: 13 48 13 48; -fx-background-radius: 2;" +
+                "-fx-opacity: " + (enabled ? "1.0" : "0.3") + ";" +
+                "-fx-cursor: " + (enabled ? "hand" : "default") + ";"
+        );
+    }
+
     private String resolveLocalInterface(String serverIp) throws Exception {
         if (serverIp.equalsIgnoreCase("localhost") || serverIp.startsWith("127.") || serverIp.isEmpty()) {
             return "127.0.0.1";
@@ -159,7 +175,10 @@ public class LoginFXMLController {
                 controller.setClient(client);
                 Platform.runLater(() -> showSuccess("Connected! Waiting for other players…"));
             } else {
-                Platform.runLater(() -> showError(serverResponse));
+                Platform.runLater(() -> {
+                    showError(serverResponse);
+                    updateLoginButton(true);
+                });
             }
         } else {
             TCPClient client = new TCPClient(controller, ip, 8080, 8081);
@@ -168,7 +187,10 @@ public class LoginFXMLController {
                 controller.setClient(client);
                 Platform.runLater(() -> showSuccess("Connected! Waiting for other players…"));
             } else {
-                Platform.runLater(() -> showError(serverResponse));
+                Platform.runLater(() -> {
+                    showError(serverResponse);
+                    updateLoginButton(true);
+                });
             }
         }
     }