package com.nilhcem.fakesmtp.gui.info;
   
   import java.awt.Font;
   import java.util.Observable;
   import java.util.Observer;
   
   import javax.swing.JLabel;
   
   import com.nilhcem.fakesmtp.model.UIModel;
  import com.nilhcem.fakesmtp.server.MailSaver;
  
  import com.apple.eawt.Application;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  /**
   * Label class to display the number of received emails.
   *
   * @author Nilhcem
   * @since 1.0
   */
  public final class NbReceivedLabel implements Observer {
  
  	private static final Logger LOGGER = LoggerFactory.getLogger(NbReceivedLabel.class);
  
  	private final JLabel nbReceived = new JLabel("0");
  
  	/**
  	 * Creates the label class (with a bold font).
  	 */
  	public NbReceivedLabel() {
  		Font boldFont = new Font(nbReceived.getFont().getName(), Font.BOLD, nbReceived.getFont().getSize());
  		nbReceived.setFont(boldFont);
  	}
  
  	/**
  	 * Returns the JLabel object.
  	 *
  	 * @return the JLabel object.
  	 */
  	public JLabel get() {
  		return nbReceived;
  	}
  
  	/**
  	 * Actions which will be done when the component will be notified by an Observable object.
  	 * <ul>
  	 *   <li>If the observable element is a {@link MailSaver} object, the method will increment
  	 *   the number of received messages and update the {@link UIModel};</li>
  	 *   <li>If the observable element is a {@link ClearAllButton}, the method will reinitialize
  	 *   the number of received messages and update the {@link UIModel};</li>
  	 *   <li>When running on OS X the method will also update the Dock Icon with the number of
  	 *   received messages.</li>
  	 * </ul>
  	 *
  	 * @param o the observable element which will notify this class.
  	 * @param arg optional parameters (not used).
  	 */
  	@Override
  	public void update(Observable o, Object arg) {
  		if (o instanceof MailSaver) {
  			UIModel model = UIModel.INSTANCE;
  			int countMsg = model.getNbMessageReceived() + 1;
  			String countMsgStr = Integer.toString(countMsg);
  
  			model.setNbMessageReceived(countMsg);
  			updateDockIconBadge(countMsgStr);
  			nbReceived.setText(countMsgStr);
  		} else if (o instanceof ClearAllButton) {
  			UIModel.INSTANCE.setNbMessageReceived(0);
  			updateDockIconBadge("");
  			nbReceived.setText("0");
  		}
  	}
  
  	private void updateDockIconBadge(String badgeValue) {
  		try {
  			Application.getApplication().setDockIconBadge(badgeValue);
  		} catch (RuntimeException e) {
  			LOGGER.debug("Error: {} - This is probably because we run on a non-Mac platform and these components are not implemented", e.getMessage());
  		} catch (Exception e) {
  			LOGGER.error("", e);
  		}
  	}
  }