package com.nilhcem.fakesmtp;
   
   import java.awt.*;
   import java.net.InetAddress;
   import java.net.URL;
   import java.net.UnknownHostException;
   
   import javax.swing.UIManager;
   
  import org.apache.commons.cli.ParseException;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  
  import com.apple.eawt.Application;
  import com.nilhcem.fakesmtp.core.ArgsHandler;
  import com.nilhcem.fakesmtp.core.Configuration;
  import com.nilhcem.fakesmtp.core.exception.UncaughtExceptionHandler;
  import com.nilhcem.fakesmtp.gui.MainFrame;
  import com.nilhcem.fakesmtp.server.SMTPServerHandler;
  
  /**
   * Entry point of the application.
   *
   * @author Nilhcem
   * @since 1.0
   */
  public final class FakeSMTP {
  	private static final Logger LOGGER = LoggerFactory.getLogger(FakeSMTP.class);
  
  	private FakeSMTP() {
  		throw new UnsupportedOperationException();
  	}
  
  	/**
  	 * Checks command line arguments, sets some specific properties, and runs the main window.
  	 * <p>
  	 * Before opening the main window, this method will:
       * </p>
  	 * <ul>
  	 *   <li>check command line arguments, and possibly display an error dialog,</li>
  	 *   <li>set a default uncaught exception handler to intercept every uncaught exception;</li>
  	 *   <li>use a custom icon in the Mac Dock;</li>
  	 *   <li>set a property for Mac OS X to take the menu bar off the JFrame;</li>
  	 *   <li>set a property for Mac OS X to set the name of the application menu item;</li>
  	 *   <li>turn off the bold font in all components for swing default theme;</li>
  	 *   <li>use the platform look and feel.</li>
  	 * </ul>
  	 *
  	 * @param args a list of command line parameters.
  	 */
  	public static void main(final String[] args) {
  		try {
  			ArgsHandler.INSTANCE.handleArgs(args);
  		} catch (ParseException e) {
  			ArgsHandler.INSTANCE.displayUsage();
  			return;
  		}
  
  		if (ArgsHandler.INSTANCE.shouldStartInBackground()) {
  			try {
  				SMTPServerHandler.INSTANCE.startServer(getPort(), getBindAddress());
  			} catch (NumberFormatException e) {
  				LOGGER.error("Error: Invalid port number", e);
  			} catch (UnknownHostException e) {
  				LOGGER.error("Error: Invalid bind address", e);
  			} catch (Exception e) {
  				LOGGER.error("Failed to auto-start server in background", e);
  			}
  		} else {
              System.setProperty("mail.mime.decodetext.strict", "false");
              Thread.setDefaultUncaughtExceptionHandler(new UncaughtExceptionHandler());
  
              EventQueue.invokeLater(new Runnable() {
  				@Override
  				public void run() {
  					try {
  						URL iconUrl = getClass().getResource(Configuration.INSTANCE.get("application.icon.path"));
  						if (iconUrl != null && !GraphicsEnvironment.isHeadless() && Taskbar.isTaskbarSupported()) {
  							Image img = Toolkit.getDefaultToolkit().getImage(iconUrl);
  							Taskbar taskbar = Taskbar.getTaskbar();
  							if (taskbar.isSupported(Taskbar.Feature.ICON_IMAGE)) {
  								taskbar.setIconImage(img);   // works on macOS Dock, Windows taskbar, many Linux DEs
  							}
  						}
  					} 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);
  					}
  
  					System.setProperty("apple.laf.useScreenMenuBar", "true");
  					System.setProperty("com.apple.mrj.application.apple.menu.about.name", Configuration.INSTANCE.get("application.name"));
  					UIManager.put("swing.boldMetal", Boolean.FALSE);
  					try {
  						UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
  					} catch (Exception e) {
  						LOGGER.error("", e);
  					}
  
 					new MainFrame();
 				}
 			});
 		}
 	}
 
 	/**
 	 * @return either the default port, or the custom port, if specified.
 	 * @throws NumberFormatException if the specified port cannot be parsed to an integer.
 	 */
 	private static int getPort() throws NumberFormatException {
 		String portStr = ArgsHandler.INSTANCE.getPort();
 		if (portStr == null) {
 			portStr = Configuration.INSTANCE.get("smtp.default.port");
 		}
 		return Integer.parseInt(portStr);
 	}
 
 	/**
 	 * @return an InetAddress representing the specified bind address, or null, if not specified
 	 * @throws UnknownHostException if the bind address is invalid
 	 */
 	private static InetAddress getBindAddress() throws UnknownHostException {
 		String bindAddressStr = ArgsHandler.INSTANCE.getBindAddress();
 		if (bindAddressStr == null || bindAddressStr.isEmpty()) {
 			return null;
 		}
 		return InetAddress.getByName(bindAddressStr);
 	}
 }