package com.nilhcem.fakesmtp.gui;
   
   import com.nilhcem.fakesmtp.core.ArgsHandler;
   import com.nilhcem.fakesmtp.core.Configuration;
   import com.nilhcem.fakesmtp.core.I18n;
   import org.slf4j.Logger;
   import org.slf4j.LoggerFactory;
   
   import javax.swing.JEditorPane;
  import javax.swing.JLabel;
  import javax.swing.JMenu;
  import javax.swing.JMenuBar;
  import javax.swing.JMenuItem;
  import javax.swing.JOptionPane;
  import javax.swing.event.HyperlinkEvent;
  import javax.swing.event.HyperlinkListener;
  import java.awt.Desktop;
  import java.awt.Font;
  import java.awt.event.ActionEvent;
  import java.awt.event.ActionListener;
  import java.net.URI;
  import java.util.Observable;
  
  /**
   * Provides the menu bar of the application.
   *
   * @author Nilhcem
   * @since 1.0
   */
  public final class MenuBar extends Observable {
  
  	private final I18n i18n = I18n.INSTANCE;
  	private final JMenuBar menuBar = new JMenuBar();
  
  	private static final Logger LOGGER = LoggerFactory.getLogger(MenuBar.class);
  
  	/**
  	 * Creates the menu bar and the different menus (file / edit / help).
  	 */
  	public MenuBar() {
  		menuBar.add(createFileMenu());
  		menuBar.add(createEditMenu());
  		menuBar.add(createHelpMenu());
  	}
  
  	/**
  	 * Returns the JMenuBar object.
  	 *
  	 * @return the JMenuBar object.
  	 */
  	public JMenuBar get() {
  		return menuBar;
  	}
  
  	/**
  	 * Creates the file menu.
  	 * <p>
  	 * The file menu contains an "Exit" item, to quit the application.
  	 * </p>
  	 *
  	 * @return the newly created file menu.
  	 */
  	private JMenu createFileMenu() {
  		JMenu fileMenu = new JMenu(i18n.get("menubar.file"));
  		fileMenu.setMnemonic(i18n.get("menubar.mnemo.file").charAt(0));
  
  		JMenuItem exit = new JMenuItem(i18n.get("menubar.exit"));
  		exit.setMnemonic(i18n.get("menubar.mnemo.exit").charAt(0));
  		exit.addActionListener(new ActionListener() {
  			@Override
  			public void actionPerformed(ActionEvent e) {
  				System.exit(0);
  			}
  		});
  
  		fileMenu.add(exit);
  		return fileMenu;
  	}
  
  	/**
  	 * Creates the edit menu.
  	 * <p>
  	 * The edit menu contains a "Messages location" item, to define the location of the incoming mails.
  	 * </p>
  	 *
  	 * @return the newly created edit menu.
  	 */
  	private JMenu createEditMenu() {
  		JMenu editMenu = new JMenu(i18n.get("menubar.edit"));
  		editMenu.setMnemonic(i18n.get("menubar.mnemo.edit").charAt(0));
  
  		JMenuItem mailsLocation = new JMenuItem(i18n.get("menubar.messages.location"));
  		mailsLocation.setMnemonic(i18n.get("menubar.mnemo.msglocation").charAt(0));
  		if (ArgsHandler.INSTANCE.memoryModeEnabled()) {
  			mailsLocation.setEnabled(false);
  		} else {
  			mailsLocation.addActionListener(new ActionListener() {
  				@Override
  				public void actionPerformed(ActionEvent e) {
 					setChanged();
 					notifyObservers();
 				}
 			});
 		}
 
 		editMenu.add(mailsLocation);
 		return editMenu;
 	}
 
 	/**
 	 * Creates the help menu.
 	 * <p>
 	 * The help menu contains an "About" item, to display some software information.
 	 * </p>
 	 *
 	 * @return the newly created help menu.
 	 */
 	private JMenu createHelpMenu() {
 		JMenu helpMenu = new JMenu(i18n.get("menubar.help"));
 		helpMenu.setMnemonic(i18n.get("menubar.mnemo.help").charAt(0));
 
 		JMenuItem about = new JMenuItem(i18n.get("menubar.about"));
 		about.setMnemonic(i18n.get("menubar.mnemo.about").charAt(0));
 		about.addActionListener(new ActionListener() {
 			@Override
 			public void actionPerformed(ActionEvent e) {
 				// for copying style
 				JLabel label = new JLabel();
 				Font font = label.getFont();
 
 				// create some css from the label's font
 				StringBuffer style = new StringBuffer("font-family:")
 					.append(font.getFamily()).append(";font-weight:");
 				if (font.isBold()) {
 					style.append("bold");
 				} else {
 					style.append("normal");
 				}
 				style.append(";font-size:").append(font.getSize()).append("pt;");
 
 				// html content
 				String link = i18n.get("menubar.about.dialog.link");
 				JEditorPane ep = new JEditorPane("text/html",
 						String.format("<html><body style=\"%s\">%s<br /><a href=\"%s\">%s</a></body></html>",
 								style, i18n.get("menubar.about.dialog"), link, link));
 
 				// handle link events
 				ep.addHyperlinkListener(new HyperlinkListener() {
 					@Override
 					public void hyperlinkUpdate(HyperlinkEvent e) {
 						if (e.getEventType().equals(HyperlinkEvent.EventType.ACTIVATED)) {
 							MenuBar.launchUrl(e.getURL().toString());
 						}
 					}
 				});
 				ep.setEditable(false);
 				ep.setBackground(label.getBackground());
 
 				// show
 				JOptionPane.showMessageDialog(menuBar.getParent(), ep, String.format(i18n.get("menubar.about.title"),
 						Configuration.INSTANCE.get("application.name")), JOptionPane.INFORMATION_MESSAGE);
 			}
 		});
 
 		helpMenu.add(about);
 		return helpMenu;
 	}
 
 	/**
 	 * Opens a web browser to launch the url specified in parameters.
 	 *
 	 * @param url the URL to launch.
 	 */
 	private static void launchUrl(String url) {
 		if (Desktop.isDesktopSupported()) {
 			try {
 				Desktop desktop = Desktop.getDesktop();
 				if (desktop != null && desktop.isSupported(Desktop.Action.BROWSE)) {
 					desktop.browse(new URI(url));
 				}
 			} catch (Exception e) {
 				LOGGER.error("", e);
 			}
 		}
 	}
 }