feat(alertController): controller for alert.

src/main/java/com/library/anishelf/controller/AlertAppController.java

@@ -0,0 +1,57 @@
+package com.library.anishelf.controller;
+
+import javafx.event.ActionEvent;
+import javafx.fxml.FXML;
+import javafx.scene.control.Button;
+import javafx.scene.control.Label;
+import javafx.stage.Stage;
+
+public class AlertAppController {
+
+    @FXML
+    private Label appAlertMessageLabel;
+
+    @FXML
+    private Button cancelAlertButton;
+
+    @FXML
+    private Button confirmAlertButton;
+
+    private boolean userAlertConfirmed = false;
+
+    @FXML
+    void handleCancelButton(ActionEvent event) {
+        closeAppAlert();
+    }
+
+    @FXML
+    void handleConfirmButton(ActionEvent event) {
+        userAlertConfirmed = true;
+        closeAppAlert();
+    }
+
+    public void setAppAlertMessage(String message) {
+        userAlertConfirmed = false;
+        appAlertMessageLabel.setText(message);
+    }
+
+    private void closeAppAlert() {
+        Stage stage = (Stage) appAlertMessageLabel.getScene().getWindow();
+        stage.close();
+    }
+
+    public boolean isUserAlertConfirmed() {
+        return userAlertConfirmed;
+    }
+
+    public void resetAlert() {
+        confirmAlertButton.setText("Xác nhận");
+        cancelAlertButton.setText("Hủy");
+        userAlertConfirmed = false; // Đặt lại xác nhận
+    }
+
+    public void setNotificationAppMode() {
+        confirmAlertButton.setText("Ok");
+        cancelAlertButton.setText("Okeee");
+    }
+}