package com.nilhcem.fakesmtp.gui.tab;
   
   import com.nilhcem.fakesmtp.gui.info.ClearAllButton;
   import com.nilhcem.fakesmtp.model.EmailModel;
   import com.nilhcem.fakesmtp.server.MailSaver;
   
   import javax.swing.JScrollPane;
   import javax.swing.JTextArea;
   import java.util.Observable;
  import java.util.Observer;
  
  /**
   * Scrolled text area where will be displayed the last received email.
   *
   * @author Nilhcem
   * @since 1.0
   */
  public final class LastMailPane implements Observer {
  
  	private final JScrollPane lastMailPane = new JScrollPane();
  	private final JTextArea lastMailArea = new JTextArea();
  
  	/**
  	 * Creates the text area and disables the possibility to edit it.
  	 */
  	public LastMailPane() {
  		lastMailArea.setEditable(false);
  		lastMailPane.getViewport().add(lastMailArea, null);
  	}
  
  	/**
  	 * Returns the JScrollPane object.
  	 *
  	 * @return the JScrollPane object.
  	 */
  	public JScrollPane get() {
  		return lastMailPane;
  	}
  
  	/**
  	 * Updates the content of the text area.
  	 * <p>
  	 * This method will be called by an observable element.
       * </p>
  	 * <ul>
  	 *   <li>If the observable is a {@link MailSaver} object, the text area will contain the content of the last received email;</li>
  	 *   <li>If the observable is a {@link ClearAllButton} object, the text area will be cleared.</li>
  	 * </ul>
  	 *
  	 * @param o the observable element which will notify this class.
  	 * @param data optional parameters (an {@code EmailModel} object, for the case of a {@code MailSaver} observable).
  	 */
  	@Override
  	public synchronized void update(Observable o, Object data) {
  		if (o instanceof MailSaver) {
  			EmailModel model = (EmailModel) data;
  			lastMailArea.setText(model.getEmailStr());
  		} else if (o instanceof ClearAllButton) {
  			lastMailArea.setText("");
  		}
  	}
  }