package com.nilhcem.fakesmtp.gui.info;
   
   import com.nilhcem.fakesmtp.model.UIModel;
   import com.nilhcem.fakesmtp.server.MailSaver;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import javax.swing.*;
   import java.awt.*;
  import java.util.Observable;
  import java.util.Observer;
  
  /**
   * 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) {
  		// No-op in headless or unsupported environments
  		if (GraphicsEnvironment.isHeadless() || !Taskbar.isTaskbarSupported()) {
  			return;
  		}
  
  		Taskbar taskbar = Taskbar.getTaskbar();
  		try {
  			// Prefer text badges when supported; pass null to clear the badge
  			if (taskbar.isSupported(Taskbar.Feature.ICON_BADGE_TEXT)) {
  				taskbar.setIconBadge(badgeValue);
  			} else if (taskbar.isSupported(Taskbar.Feature.ICON_BADGE_NUMBER)) {
  				// Some platforms accept only numbers: pass a numeric string or null
  				String numeric = (badgeValue != null && badgeValue.matches("\\d+")) ? badgeValue : null;
  				taskbar.setIconBadge(numeric);
  			}
  		} catch (UnsupportedOperationException | SecurityException e) {
  			LOGGER.debug("Dock badging not supported/allowed: {}", e.getMessage());
  		} catch (Exception e) {
  			LOGGER.error("Failed to set dock badge", e);
  		}
  	}
  }