path: root/dozentenmodul/src/main/java/org/openslx/dozmod/gui/MainWindow.java

package org.openslx.dozmod.gui;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.KeyEventDispatcher;
import java.awt.KeyboardFocusManager;
import java.awt.Window;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;

import org.apache.log4j.Logger;
import org.openslx.dozmod.App;
import org.openslx.dozmod.Config;
import org.openslx.dozmod.gui.Gui.GuiCallable;
import org.openslx.dozmod.gui.helper.CompositePage;
import org.openslx.dozmod.gui.helper.MessageType;
import org.openslx.dozmod.gui.window.DisclaimerWindow;
import org.openslx.dozmod.gui.window.LoginWindow;
import org.openslx.dozmod.gui.window.MainMenuWindow;
import org.openslx.dozmod.gui.window.VirtualizerNoticeWindow;
import org.openslx.dozmod.thrift.Session;
import org.openslx.thrifthelper.ThriftManager;
import org.openslx.thrifthelper.ThriftManager.ErrorCallback;
import org.openslx.util.QuickTimer;

public abstract class MainWindow {

	private final static Logger LOGGER = Logger.getLogger(MainWindow.class);

	private static final JFrame mainWindow = new JFrame("bwLehrstuhl");
	private static final JPanel mainContainer = new JPanel();

	private static CompositePage currentPage;

	private static final Map<Class<? extends CompositePage>, CompositePage> pages = new ConcurrentHashMap<>();

	private static final String THRIFT_CONNECTION_ERROR = "Lost connection to the masterserver. Do you want to retry?";

	/**
	 * Set the visible page of the main window.
	 * 
	 * @param clazz
	 */
	public static void showPage(Class<? extends CompositePage> clazz) {
		if (currentPage != null) {
			if (!currentPage.requestHide()) {
				return; // Canceled by currently shown page
			}
			currentPage.setVisible(false);
		}

		currentPage = pages.get(clazz);
		if (currentPage == null) {
			Gui.showMessageBox("Tried to show unknown page " + clazz.getSimpleName(), MessageType.ERROR,
					LOGGER, null);
			Gui.exit(1);
			return;
		}

		// sets the starting preferred size.
		currentPage.requestShow();
		currentPage.setVisible(true);
		mainWindow.validate();
	}

	public static void centerShell(Window shell) {
		Gui.centerShellOverShell(mainWindow, shell);
	}

	/**
	 * Initializes the GUI by creating the main window, adding the menu and
	 * creating the login mask as the first content window.
	 * Further sets up the global thrift error callback to catch any
	 * connection errors during the communication with the servers.
	 */

	public static void open() {
		// init SWT stuff
		mainWindow.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

		// Catch the close button (X)
		mainWindow.addWindowListener(new WindowAdapter() {
			@Override
			public void windowClosing(WindowEvent e) {
				MainWindow.askApplicationQuit();
			}
		});

		// Set up thrift error message displaying
		ThriftManager.setErrorCallback(new ErrorCallback() {
			@Override
			public boolean thriftError(int failCount, String method, final Throwable t) {
				// if it's the first fail, retry immediately
				if (failCount == 1)
					return true;
				// Otherwise, ask user if we should retry
				return Gui.syncExec(new GuiCallable<Boolean>() {
					@Override
					public Boolean run() {
						return Gui.showMessageBox(THRIFT_CONNECTION_ERROR, MessageType.ERROR_RETRY, LOGGER, t);
					}
				});
			}
		});

		// Same for config errors
		Config.setErrorCallback(new Config.ErrorCallback() {
			@Override
			public void writeError(final Throwable t) {
				Gui.asyncExec(new Runnable() {
					@Override
					public void run() {
						Gui.showMessageBox("Konnte Programmeinstellungen nicht speichern", MessageType.WARNING,
								LOGGER, t);
					}
				});
			}
		});

		// Global key listener
		KeyboardFocusManager.getCurrentKeyboardFocusManager()
		  .addKeyEventDispatcher(new KeyEventDispatcher() {
		      @Override
		      public boolean dispatchKeyEvent(KeyEvent event) {
				if (event.getKeyChar() == 17) { // Ctrl-Q = Quit
					askApplicationQuit();
					event.consume();
				}
				return event.isConsumed();
			}
		});

		createMenu();

		// Set layout for the mainshell, items added to the shell should get a gridData
		mainContainer.setLayout(new BoxLayout(mainContainer, BoxLayout.PAGE_AXIS));
		mainWindow.setMinimumSize(new Dimension(850, 650));

		// register all pages of the main window
		registerPage(new MainMenuWindow());
		//registerPage(new ImageListWindow());
		//registerPage(new LectureListWindow());
		// Show main menu by default
		showPage(MainMenuWindow.class);

		// center the window on the primary monitor
		mainWindow.getContentPane().add(mainContainer, BorderLayout.CENTER);
		mainWindow.setVisible(true);
		Gui.centerShell(mainWindow);
		Gui.limitShellSize(mainWindow);

		// here we can check for Session information
		if (Session.getSatelliteToken() != null) {
			// Wait for proxy server init
			App.waitForInit();
			// TODO: Try to resume session
		}
		// Session resume probably failed, show login window
		if (Session.getSatelliteToken() == null) {
			// User did not login, show the login mask
			LoginWindow.open();
		}
	}

	/**
	 * Request application quit. Will show a message box asking the user for
	 * confirmation.
	 */
	protected static void askApplicationQuit() {
		// TODO: Only ask if an upload or download is running,, wizard is open etc..
		if (Gui.showMessageBox("Are you sure you want to quit?", MessageType.QUESTION_YESNO, null, null)) {
			QuickTimer.cancel();
			Gui.exit(0);
		}
	}

	/**
	 * Register a page that can be displayed in the main window.
	 * 
	 * @param window
	 */
	private static synchronized void registerPage(CompositePage window) {
		Class<? extends CompositePage> clazz = window.getClass();
		if (pages.containsKey(clazz))
			throw new IllegalArgumentException("Page " + clazz.getSimpleName() + " already registered!");
		pages.put(clazz, window);
		mainContainer.add(window);
		window.setVisible(false);
	}

	private static void createMenu() {
		// the File menu button
		JMenuBar menuBar = new JMenuBar();
		mainWindow.setJMenuBar(menuBar);
		
		JMenu cascadeFileMenu = new JMenu("&File");
		menuBar.add(cascadeFileMenu);

		JMenuItem exitItem = new JMenuItem("&Exit");
		cascadeFileMenu.add(exitItem);
		
		exitItem.addMouseListener(new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent arg0) {
				askApplicationQuit();
			}
		});

		// the About menu button
		JMenu cascadeAboutMenu = new JMenu("&About");
		menuBar.add(cascadeAboutMenu);

		JMenuItem disclaimerItem = new JMenuItem("&Disclaimer");
		JMenuItem virtualizerNoticeItem = new JMenuItem("&Virtualizer");
		cascadeAboutMenu.add(disclaimerItem);
		cascadeAboutMenu.add(virtualizerNoticeItem);
		
		disclaimerItem.addMouseListener(new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent arg0) {
				DisclaimerWindow.open(false);
			}
		});

		virtualizerNoticeItem.addMouseListener(new MouseAdapter() {
			@Override
			public void mousePressed(MouseEvent arg0) {
				VirtualizerNoticeWindow.open(false);
			}
		});
	}

}