package com.nilhcem.fakesmtp.gui.info;

 import com.nilhcem.fakesmtp.core.Configuration;

 import com.nilhcem.fakesmtp.core.I18n;

 import com.nilhcem.fakesmtp.server.MailSaver;

 import com.nilhcem.fakesmtp.server.SMTPServerHandler;

 import javax.swing.JButton;

 import javax.swing.JOptionPane;

 import java.awt.event.ActionEvent;

 import java.awt.event.ActionListener;

 import java.util.Observable;

 import java.util.Observer;

 /**

  * Button to clear all the information from the main panel.

  * <p>

  * The button will ask the user if he wants to delete the received emails or not.<br>

  * If yes, emails will be deleted from file system.

  * </p>

  *

  * @author Nilhcem

  * @since 1.0

  */

 public final class ClearAllButton extends Observable implements Observer {

         private final I18n i18n = I18n.INSTANCE;

         private final JButton button = new JButton(i18n.get("clearall.button"));

         /**

          * Creates the "clear all" button"

          * <p>

          * The button will be disabled by default, since no email is received when the application starts.<br>

          * The button will display a confirmation dialog to know if it needs to delete the received emails or not.<br>

          * If yes, emails will be deleted from the file system.

          * </p>

          */

         public ClearAllButton() {

                 button.setToolTipText(i18n.get("clearall.tooltip"));

                 button.addActionListener(new ActionListener() {

                         @Override

                         public void actionPerformed(ActionEvent e) {

                                 int answer = JOptionPane.showConfirmDialog(button.getParent(), i18n.get("clearall.delete.email"),

                                         String.format(i18n.get("clearall.title"), Configuration.INSTANCE.get("application.name")),

                                                 JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);

                                 if (answer == JOptionPane.CLOSED_OPTION) {

                                         return;

                                 }

                                 synchronized (SMTPServerHandler.INSTANCE.getMailSaver().getLock()) {

                                     // Note: Should delete emails before calling observers, since observers will clean the model.

                                         if (answer == JOptionPane.YES_OPTION) {

                                                 SMTPServerHandler.INSTANCE.getMailSaver().deleteEmails();

                                         }

                                     setChanged();

                                     notifyObservers();

                                         button.setEnabled(false);

                                 }

                         }

                 });

                 button.setEnabled(false);

         }

         /**

          * Returns the JButton object.

          *

          * @return the JButton object.

          */

         public JButton get() {

                 return button;

         }

         /**

          * Enables the button, so that the user can clear/delete emails.

          * <p>

          * This method will be called by a {@link MailSaver} object when an email will be received.

          * </p>

          */

         @Override

         public void update(Observable o, Object arg) {

                 if (o instanceof MailSaver && !button.isEnabled()) {

                         button.setEnabled(true);

                 }

         }

 }