/*
 * Copyright 2007 - 2016 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.sf.jailer.ui;

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Frame;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.OutputStream;
import java.io.PrintStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JMenu;
import javax.swing.JOptionPane;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;

import net.sf.jailer.CommandLineParser;
import net.sf.jailer.Jailer;
import net.sf.jailer.database.Session;
import net.sf.jailer.database.SqlException;
import net.sf.jailer.progress.ProgressListener;
import net.sf.jailer.ui.scrollmenu.JScrollC2PopupMenu;
import net.sf.jailer.ui.scrollmenu.JScrollPopupMenu;
import net.sf.jailer.util.CancellationException;
import net.sf.jailer.util.CancellationHandler;

import org.apache.log4j.Logger;

/**
 * Some utility methods.
 * 
 * @author Ralf Wisser
 */
public class UIUtil {

	/**
	 * The logger.
	 */
	private static final Logger _log = Logger.getLogger(UIUtil.class);

	/**
	 * Opens file chooser.
	 * 
	 * @param selectedFile
	 *            if not <code>null</code> this file will be selected initially
	 * @param startDir
	 *            directory to start with
	 * @param description
	 *            description of file to chose
	 */
	public static String choseFile(File selectedFile, String startDir,
			final String description, final String extension, Component parent,
			boolean addExtension, boolean forLoad) {
		return choseFile(selectedFile, startDir, description, extension,
				parent, addExtension, forLoad, true);
	}

	/**
	 * Opens file chooser.
	 * 
	 * @param selectedFile
	 *            if not <code>null</code> this file will be selected initially
	 * @param startDir
	 *            directory to start with
	 * @param description
	 *            description of file to chose
	 */
	public static String choseFile(File selectedFile, String startDir,
			final String description, final String extension, Component parent,
			boolean addExtension, boolean forLoad, final boolean allowZip) {
		String newStartDir = restoreCurrentDir(extension);
		if (newStartDir != null) {
			startDir = newStartDir;
		}
		JFileChooser fileChooser = new JFileChooser(startDir);
		javax.swing.filechooser.FileFilter filter = new javax.swing.filechooser.FileFilter() {
			public boolean accept(File pathname) {
				return pathname.isDirectory()
						|| pathname.getName().toLowerCase().endsWith(extension)
						|| pathname.getName().toLowerCase()
								.endsWith(extension + ".gz")
						|| pathname.getName().toLowerCase()
								.endsWith(extension + ".zip");
			}

			public String getDescription() {
				if (extension.endsWith(".sql") || extension.endsWith(".xml")) {
					if (allowZip) {
						return "*" + extension + " *" + extension + ".zip" + " *" + extension + ".gz";
					}
				}
				return "*" + extension;
			}
		};
		fileChooser.setFileFilter(filter);
		fileChooser.setDialogTitle(description);
		if (selectedFile != null) {
			fileChooser.setSelectedFile(selectedFile);
		}
		fileChooser.setDialogType(forLoad ? JFileChooser.OPEN_DIALOG
				: JFileChooser.SAVE_DIALOG);
		int returnVal = forLoad ? fileChooser.showOpenDialog(parent)
				: fileChooser.showSaveDialog(parent);
		if (returnVal == JFileChooser.APPROVE_OPTION) {
			String fn = "";
			try {
				File f = fileChooser.getSelectedFile();
				String work = new File(".").getCanonicalPath();
				if (f.getCanonicalPath().startsWith(work)) {
					fn = f.getName();
					f = f.getParentFile();
					while (f != null && !f.getCanonicalPath().equals(work)) {
						fn = f.getName() + File.separator + fn;
						f = f.getParentFile();
					}
				} else {
					fn = f.getCanonicalPath();
				}
				if (addExtension
						&& !(fn.endsWith(extension) || (allowZip 
								&& (fn.endsWith(extension + ".zip") || fn.endsWith(extension + ".gz"))))) {
					fn += extension;
				}
				try {
					storeCurrentDir(extension, fileChooser.getSelectedFile()
							.getParent());
				} catch (Exception e) {
					// ignore
				}
				return fn;
			} catch (IOException e1) {
				try {
					fn = fileChooser.getSelectedFile().getCanonicalPath();
					if (addExtension
							&& !(fn.endsWith(extension) || (allowZip 
									&& (fn.endsWith(extension + ".zip") || fn.endsWith(extension + ".gz"))))) {
						fn += extension;
					}
					return fn;
				} catch (IOException e) {
					throw new RuntimeException(e.getMessage(), e);
				}
			}
		}
		return null;
	}

	/**
	 * File to store current directory of file chooser.
	 */
	private final static File cdSettings = new File(".cdsettings");

	/**
	 * Stores current directory of file chooser.
	 * 
	 * @param key
	 *            the key under which to store current directory
	 * @param currentDir
	 *            the current directory
	 */
	@SuppressWarnings("unchecked")
	private static void storeCurrentDir(String key, String currentDir) {
		try {
			Map<String, String> cd = new HashMap<String, String>();
			if (cdSettings.exists()) {
				try {
					ObjectInputStream in = new ObjectInputStream(
							new FileInputStream(cdSettings));
					cd = (Map<String, String>) in.readObject();
					in.close();
				} catch (Exception e) {
					// ignore
				}
			}
			cdSettings.delete();
			cd.put(key, currentDir);
			ObjectOutputStream out = new ObjectOutputStream(
					new FileOutputStream(cdSettings));
			out.writeObject(cd);
			out.close();
		} catch (Exception e) {
			// ignore
		}
	}

	/**
	 * Restores current directory of file chooser.
	 * 
	 * @param key
	 *            the key of the current directory to restore
	 * @return the current directory, or <code>null</code> if no directory has
	 *         been stored under the key
	 */
	@SuppressWarnings("unchecked")
	private static String restoreCurrentDir(String key) {
		if (cdSettings.exists()) {
			try {
				ObjectInputStream in = new ObjectInputStream(
						new FileInputStream(cdSettings));
				String cd = ((Map<String, String>) in.readObject()).get(key);
				in.close();
				return cd;
			} catch (Exception e) {
				// ignore
			}
		}
		return null;
	}

	/**
	 * Calls the Jailer export engine via CLI.
	 * 
	 * @param ownerOfConsole
	 *            owner component of jailer console
	 * @param cliArgs
	 *            CLI arguments
	 * @param showLogfileButton
	 *            console property
	 * @param printCommandLine
	 *            if true, print CLI command line
	 * @param showExplainLogButton
	 *            console property
	 * @param closeOutputWindow
	 *            if <code>true</code>, close console immediately after call
	 * @param continueOnErrorQuestion
	 *            to ask when call fails
	 * @param password
	 *            CLI argument to print as "*****"
	 * @return <code>true</code> iff call succeeded
	 */
	public static boolean runJailer(Window ownerOfConsole,
			List<String> cliArgs, boolean showLogfileButton,
			final boolean printCommandLine, boolean showExplainLogButton,
			final boolean closeOutputWindow, String continueOnErrorQuestion,
			String password, final ProgressListener progressListener,
			final ProgressPanel progressPanel, final boolean showExeptions,
			boolean fullSize, boolean returnFalseOnError) {
		return runJailer(ownerOfConsole, cliArgs, showLogfileButton,
				printCommandLine, showExplainLogButton, closeOutputWindow,
				continueOnErrorQuestion, password, progressListener,
				progressPanel, showExeptions, fullSize, false, returnFalseOnError);
	}

	/**
	 * Calls the Jailer export engine via CLI.
	 * 
	 * @param ownerOfConsole
	 *            owner component of jailer console
	 * @param cliArgs
	 *            CLI arguments
	 * @param showLogfileButton
	 *            console property
	 * @param printCommandLine
	 *            if true, print CLI command line
	 * @param showExplainLogButton
	 *            console property
	 * @param closeOutputWindow
	 *            if <code>true</code>, close console immediately after call
	 * @param continueOnErrorQuestion
	 *            to ask when call fails
	 * @param password
	 *            CLI argument to print as "*****"
	 * @return <code>true</code> iff call succeeded
	 */
	public static boolean runJailer(Window ownerOfConsole,
			List<String> cliArgs, boolean showLogfileButton,
			final boolean printCommandLine, boolean showExplainLogButton,
			final boolean closeOutputWindow, String continueOnErrorQuestion,
			String password, final ProgressListener progressListener,
			final ProgressPanel progressPanel, final boolean showExeptions,
			boolean fullSize, final boolean closeOutputWindowOnError,
			boolean returnFalseOnError) {
		JDialog dialog = new JDialog(ownerOfConsole);
		List<String> args = new ArrayList<String>(cliArgs);
		final StringBuffer arglist = createCLIArgumentString(password, args);
		final String[] argsarray = new String[args.size()];
		int i = 0;
		for (String arg : args) {
			argsarray[i++] = arg.trim();
		}
		final JailerConsole outputView = new JailerConsole(ownerOfConsole,
				dialog, showLogfileButton, showExplainLogButton, progressPanel,
				fullSize);
		final PrintStream originalOut = System.out;
		final boolean[] ready = new boolean[] { true };
		System.setOut(new PrintStream(new OutputStream() {
			private int lineNr = 0;
			StringBuffer buffer = new StringBuffer();

			public synchronized void write(byte[] arg0, int arg1, int arg2)
					throws IOException {
				super.write(arg0, arg1, arg2);
			}

			public void write(int b) throws IOException {
				if (b != '@') {
					originalOut.write(b);
				}
				boolean wasReady;
				synchronized (buffer) {
					wasReady = ready[0];
					if (b != '@') {
						buffer.append((char) b);
					}
				}
				if ((char) b == '\n') {
					++lineNr;
				}
				if ((char) b == '\n' && lineNr % 60 == 0 || (char) b == '@') {
					if (wasReady) {
						synchronized (buffer) {
							ready[0] = false;
						}
						try {
							SwingUtilities.invokeAndWait(new Runnable() {
								public void run() {
									synchronized (buffer) {
										if (buffer.length() > 0) {
											outputView.appendText(buffer
													.toString());
											buffer.setLength(0);
										}
									}
									ready[0] = true;
								}
							});
						} catch (InterruptedException e) {
							e.printStackTrace();
						} catch (InvocationTargetException e) {
							e.printStackTrace();
						}
					}
				}
			}
		}));
		final boolean[] exceptionShown = new boolean[1];
		try {
			try {
				File exportLog = new File("export.log");
				File sqlLog = new File("sql.log");
				if (exportLog.exists()) {
					FileOutputStream out = new FileOutputStream(exportLog);
					out.close();
				}
				if (sqlLog.exists()) {
					FileOutputStream out = new FileOutputStream(sqlLog);
					out.close();
				}
			} catch (Exception e) {
				UIUtil.showException(null, "Error", e, arglist);
			}
			final boolean[] result = new boolean[] { false };
			final Throwable[] exp = new Throwable[1];
			final StringBuffer warnings = new StringBuffer();
			final boolean[] fin = new boolean[] { false };
			outputView.dialog.addWindowListener(new WindowAdapter() {
				boolean cancelled = false;

				@Override
				public void windowClosing(WindowEvent e) {
					boolean f;
					synchronized (UIUtil.class) {
						f = exp[0] == null;
					}
					if (cancelled && f) {
						JOptionPane.showMessageDialog(outputView.dialog,
								"Cancellation in progress...", "Cancellation",
								JOptionPane.INFORMATION_MESSAGE);
					}
					if (exp[0] == null && !fin[0] && !cancelled) {
						if (JOptionPane.showConfirmDialog(outputView.dialog,
								"Cancel operation?", "Cancellation",
								JOptionPane.YES_NO_OPTION,
								JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION) {
							new Thread(new Runnable() {
								@Override
								public void run() {
									CancellationHandler.cancel(null);
								}
							}).start();
							outputView.dialog
									.setTitle("Jailer Console - cancelling...");
							if (progressListener != null) {
								progressListener.newStage("cancelling", true,
										true);
							}
							cancelled = true;
						}
					}
				}
			});
			new Thread(new Runnable() {
				public void run() {
					for (int i = 0;; ++i) {
						try {
							Thread.sleep(i == 0 ? 500 : 1000);
						} catch (InterruptedException e) {
						}
						synchronized (fin) {
							if (fin[0]) {
								break;
							}
							System.out.print("@");
						}
					}
				}
			}).start();

			new Thread(new Runnable() {
				public void run() {
					try {
						if (printCommandLine) {
							_log.info("arguments: " + arglist.toString().trim());
						}
						result[0] = Jailer
								.jailerMain(argsarray,
										disableWarnings ? new StringBuffer()
												: warnings, progressListener);
					} catch (Throwable t) {
						synchronized (UIUtil.class) {
							exp[0] = t;
						}
					} finally {
						// flush
						System.out.println("@");
						synchronized (UIUtil.class) {
							fin[0] = true;
						}
					}
					SwingUtilities.invokeLater(new Runnable() {
						public void run() {
							synchronized (UIUtil.class) {
								outputView.dialog
										.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
								if (progressListener != null) {
									progressListener.newStage(
											exp[0] == null ? "finished"
													: "failed", exp[0] != null,
											true);
								}
								if ((exp[0] instanceof CancellationException)
										|| closeOutputWindowOnError
										|| (closeOutputWindow && result[0]
												&& exp[0] == null && warnings
												.length() == 0)) {
									outputView.dialog.setVisible(false);
								} else {
									outputView.finish(result[0]
											&& exp[0] == null);
									if (result[0] && warnings.length() > 0) {
										JOptionPane.showMessageDialog(
												outputView.dialog,
												warnings.length() > 800 ? warnings
														.substring(0, 800)
														+ "..." : warnings
														.toString(), "Warning",
												JOptionPane.INFORMATION_MESSAGE);
										outputView.dialog.setVisible(false);
									} else if (showExeptions
											&& exp[0] != null
											&& !(exp[0] instanceof CancellationException)) {
										UIUtil.showException(outputView.dialog,
												"Error", exp[0], arglist);
										exceptionShown[0] = true;
									}
									if (result[0] && progressPanel != null) {
										progressPanel.confirm();
									}
								}
							}
						}
					});
				}
			}, "jailer-main").start();
			outputView.dialog.setVisible(true);
			synchronized (UIUtil.class) {
				if (exp[0] != null) {
					if (returnFalseOnError) {
						result[0] = false;
					} else {
						throw exp[0];
					}
				}
			}
			if (!result[0] && continueOnErrorQuestion != null) {
				result[0] = JOptionPane.showConfirmDialog(outputView.dialog,
						continueOnErrorQuestion, "Error",
						JOptionPane.YES_NO_OPTION) == JOptionPane.YES_OPTION;
			}
			return result[0];
		} catch (Throwable t) {
			if (t instanceof CancellationException) {
				CancellationHandler.reset(null);
			} else {
				boolean shown = false;
				synchronized (UIUtil.class) {
					shown = exceptionShown[0];
				}
				if (!shown) {
					UIUtil.showException(null, "Error", t, arglist);
				}
			}
			return false;
		} finally {
			System.setOut(originalOut);
		}
	}

	public static StringBuffer createCLIArgumentString(String password,
			List<String> args) {
		args.add("-datamodel");
		args.add(CommandLineParser.getInstance().getDataModelFolder());
		args.add("-script-enhancer");
		args.add(CommandLineParser.getInstance().enhancerFolder);
		if (CommandLineParser.getInstance().workingFolder != null) {
			args.add("-working-folder");
			args.add(CommandLineParser.getInstance().workingFolder);
		}
		final StringBuffer arglist = new StringBuffer();
		int pwi = -1;
		for (int i = args.size() - 1; i >=0; --i) {
			if (args.get(i) != null && args.get(i).equals(password) && password.length() > 0) {
				pwi = i;
				break;
			}
		}
		for (int i = 0; i < args.size(); ++i) {
			String arg = args.get(i);
			if (i == pwi) {
				arglist.append(" \"<password>\"");
			} else {
				if ("".equals(arg) || arg.contains(" ") || arg.contains("<")
						|| arg.contains(">") || arg.contains("*")
						|| arg.contains("?") || arg.contains("|")
						|| arg.contains("$") || arg.contains("\"")
						|| arg.contains("'") || arg.contains("\\")
						|| arg.contains(";") || arg.contains("&")) {
					arglist.append(" \"");
					for (int j = 0; j < arg.length(); ++j) {
						char c = arg.charAt(j);
						if (c == '\"' || c == '$') {
							arglist.append("\\");
						}
						arglist.append(c);
					}
					arglist.append("\"");
				} else {
					arglist.append(" " + arg);
				}
			}
		}
		return arglist;
	}

	/**
	 * Shows an exception.
	 * 
	 * @param parent
	 *            parent component of option pane
	 * @param title
	 *            title of option pane
	 * @param t
	 *            the exception
	 */
	public static void showException(Component parent, String title, Throwable t) {
		showException(parent, title, t, null);
	}

	/**
	 * Shows an exception.
	 * 
	 * @param parent
	 *            parent component of option pane
	 * @param title
	 *            title of option pane
	 * @param context
	 *            optional context object. String or Session is supported.
	 * @param t
	 *            the exception
	 */
	public static void showException(Component parent, String title, Throwable t, Object context) {
		t.printStackTrace();
		if (!(t instanceof ClassNotFoundException)) {
			while (t.getCause() != null && t != t.getCause()
					&& !(t instanceof SqlException)) {
				t = t.getCause();
			}
		}
		if (t instanceof SqlException) {
			String message = ((SqlException) t).message;
			String sql = ((SqlException) t).sqlStatement;
			new SqlErrorDialog(parent == null ? null
					: SwingUtilities.getWindowAncestor(parent), lineWrap(
					message, 120).toString(), lineWrap(sql, 120).toString(), true);
			return;
		}
		String message = t.getMessage();
		if (message == null || "".equals(message.trim())) {
			message = t.getClass().getName();
		}
		StringBuilder msg = lineWrap(message, 80);
		
		String contextDesc = "";
		if (context != null) {
			if (context instanceof Session) {
				Session session = (Session) context;
				contextDesc = session.dbUrl + " (" + session.dbms + ")";
			} else {
				contextDesc = lineWrap(context.toString(), 80).toString();
			}
		}
		StringWriter sw = new StringWriter();
		PrintWriter pw = new PrintWriter(sw);
		t.printStackTrace(pw);
		contextDesc += "\nHelp Desk: https://sourceforge.net/forum/?group_id=197260";
		contextDesc += "\nMail: https://sourceforge.net/forum/?group_id=197260\n";
		contextDesc += "\n" + Jailer.APPLICATION_NAME + " " + Jailer.VERSION + "\n\n" + sw.toString();

		new SqlErrorDialog(parent == null ? null
				: SwingUtilities.getWindowAncestor(parent), msg.toString(), contextDesc, false);
	}

	private static StringBuilder lineWrap(String message, int maxwidth) {
		StringBuilder msg = new StringBuilder();
		Pattern wrapRE = Pattern.compile("(\\S\\S{" + maxwidth + ",}|.{1,"
				+ maxwidth + "})(\\s+|$)");
		Matcher m = wrapRE.matcher(message == null ? "" : message);
		while (m.find()) {
			String line = m.group();
			while (line.length() > maxwidth + 10) {
				msg.append(line.substring(0, maxwidth) + "\n");
				line = line.substring(maxwidth);
			}
			msg.append(line + (line.contains("\n") ? "" : "\n"));
		}
		return msg;
	}

	/**
	 * Loads table list file and fill a list.
	 * 
	 * @param list
	 *            to fill
	 * @param fileName
	 *            name of file
	 */
	public static void loadTableList(List<String> list, String fileName)
			throws IOException {
		File file = new File(fileName);
		if (file.exists()) {
			BufferedReader in = new BufferedReader(new FileReader(file));
			String line;
			while ((line = in.readLine()) != null) {
				line = line.trim();
				if (line.length() > 0) {
					list.add(line);
				}
			}
			in.close();
		}
	}

	/**
	 * Initializes peer of newly created window.
	 * 
	 * Should not be neccassary, but there is a strange bug in AWT of jre 6 on
	 * multi-core/processor systems. Sleeping a little after creating peer and
	 * before making peer visible seems to help.
	 */
	public static void initPeer() {
		try {
			Thread.sleep(200);
		} catch (InterruptedException e) {
		}
	}

	public static void fit(JDialog d) {
		try {
			// Get the size of the screen
			Dimension dim = Toolkit.getDefaultToolkit().getScreenSize();
			int hd = d.getY() + d.getHeight() - (dim.height - 80);
			if (hd > 0) {
				d.setSize(d.getWidth(), Math.max(d.getHeight() - hd, 150));
			}
		} catch (Throwable t) {
			// ignore
		}
	}

	public static boolean disableWarnings = false;

	/**
	 * Tries to get as much memory as possible and shows it's size.
	 */
	public static void showMaxMemory() {
		long memSize = 0;
		try {
			final int MB = 1024 * 1024;
			List<byte[]> mem = new ArrayList<byte[]>();
			while (true) {
				mem.add(new byte[MB]);
				memSize += MB;
			}
		} catch (OutOfMemoryError e) {
			JOptionPane.showConfirmDialog(null, "MaxMem=" + memSize, "",
					JOptionPane.INFORMATION_MESSAGE);
		}
	}

	public static void replace(JComponent component, JComponent replacement) {
		Container parent = component.getParent();
		GridBagConstraints c = ((GridBagLayout) parent.getLayout())
				.getConstraints(component);
		parent.remove(component);
		if (replacement != null) {
			parent.add(replacement, c);
		}
	}

	public static void wireComponentWithButton(JComponent component,
			final JButton button) {
		component.addMouseListener(new MouseAdapter() {
			@Override
			public void mouseClicked(MouseEvent e) {
				if (e.getButton() == MouseEvent.BUTTON1
						&& e.getClickCount() > 1) {
					if (button.isEnabled()) {
						button.doClick();
					}
				}
			}
		});
		component.addKeyListener(new KeyListener() {
			@Override
			public void keyTyped(KeyEvent e) {
				if (e.getKeyChar() == '\n') {
					if (button.isEnabled()) {
						button.doClick();
					}
				}
			}

			@Override
			public void keyReleased(KeyEvent arg0) {
			}

			@Override
			public void keyPressed(KeyEvent arg0) {
			}
		});
	}

	public static void fit(JPopupMenu popup) {
		if (!(popup instanceof JScrollPopupMenu || popup instanceof JScrollC2PopupMenu)) {
			final int MAX_ITEMS = 40;
			Component[] comps = popup.getComponents();
			popup.removeAll();
			JMenu current = null;
			int ci = 1;
			for (int i = 0; i < comps.length; ++i) {
				if (ci > MAX_ITEMS && i < comps.length - 5) {
					ci = 1;
					JMenu newMenu = new JMenu("more...");
					if (current == null) {
						popup.add(newMenu);
					} else {
						current.add(newMenu);
					}
					current = newMenu;
				}
				if (current == null) {
					popup.add(comps[i]);
				} else {
					current.add(comps[i]);
				}
				++ci;
			}
		}
	}

	public static void checkTermination() {
		for (Window w: Frame.getWindows()) {
			if (w.isShowing()) {
				return;
			}
		}
		System.exit(0);
	}
	
}
