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);
  		}
  	}
  }