// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui;

import static org.openstreetmap.josm.tools.I18n.tr;
import static org.openstreetmap.josm.tools.I18n.trn;
import gnu.getopt.Getopt;
import gnu.getopt.LongOpt;

import java.awt.Dimension;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.Authenticator;
import java.net.Inet6Address;
import java.net.InetAddress;
import java.net.ProxySelector;
import java.net.URL;
import java.security.AllPermission;
import java.security.CodeSource;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.PermissionCollection;
import java.security.Permissions;
import java.security.Policy;
import java.security.cert.CertificateException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.EnumMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.TreeSet;

import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.RepaintManager;
import javax.swing.SwingUtilities;

import org.jdesktop.swinghelper.debug.CheckThreadViolationRepaintManager;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.actions.PreferencesAction;
import org.openstreetmap.josm.data.AutosaveTask;
import org.openstreetmap.josm.data.CustomConfigurator;
import org.openstreetmap.josm.data.Version;
import org.openstreetmap.josm.gui.download.DownloadDialog;
import org.openstreetmap.josm.gui.preferences.server.OAuthAccessTokenHolder;
import org.openstreetmap.josm.gui.preferences.server.ProxyPreference;
import org.openstreetmap.josm.gui.util.GuiHelper;
import org.openstreetmap.josm.io.DefaultProxySelector;
import org.openstreetmap.josm.io.MessageNotifier;
import org.openstreetmap.josm.io.OnlineResource;
import org.openstreetmap.josm.io.auth.CredentialsManager;
import org.openstreetmap.josm.io.auth.DefaultAuthenticator;
import org.openstreetmap.josm.io.remotecontrol.RemoteControl;
import org.openstreetmap.josm.plugins.PluginHandler;
import org.openstreetmap.josm.plugins.PluginInformation;
import org.openstreetmap.josm.tools.BugReportExceptionHandler;
import org.openstreetmap.josm.tools.FontsManager;
import org.openstreetmap.josm.tools.I18n;
import org.openstreetmap.josm.tools.ImageProvider;
import org.openstreetmap.josm.tools.OsmUrlToBounds;
import org.openstreetmap.josm.tools.PlatformHookWindows;
import org.openstreetmap.josm.tools.Utils;

/**
 * Main window class application.
 *
 * @author imi
 */
public class MainApplication extends Main {

    /**
     * Constructs a new {@code MainApplication}.
     */
    public MainApplication() {
       // Allow subclassing (see JOSM.java)
    }

    /**
     * Constructs a main frame, ready sized and operating. Does not display the frame.
     * @param mainFrame The main JFrame of the application
     */
    public MainApplication(JFrame mainFrame) {
        addListener();
        mainFrame.setContentPane(contentPanePrivate);
        mainFrame.setJMenuBar(menu);
        geometry.applySafe(mainFrame);
        List<Image> l = new LinkedList<>();
        l.add(ImageProvider.get("logo_16x16x32").getImage());
        l.add(ImageProvider.get("logo_16x16x8").getImage());
        l.add(ImageProvider.get("logo_32x32x32").getImage());
        l.add(ImageProvider.get("logo_32x32x8").getImage());
        l.add(ImageProvider.get("logo_48x48x32").getImage());
        l.add(ImageProvider.get("logo_48x48x8").getImage());
        l.add(ImageProvider.get("logo").getImage());
        mainFrame.setIconImages(l);
        mainFrame.addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(final WindowEvent arg0) {
                Main.exitJosm(true, 0);
            }
        });
        mainFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    }

    /**
     * Displays help on the console
     * @since 2748
     */
    public static void showHelp() {
        // TODO: put in a platformHook for system that have no console by default
        System.out.println(tr("Java OpenStreetMap Editor")+" ["
                +Version.getInstance().getAgentString()+"]\n\n"+
                tr("usage")+":\n"+
                "\tjava -jar josm.jar <options>...\n\n"+
                tr("options")+":\n"+
                "\t--help|-h                                 "+tr("Show this help")+"\n"+
                "\t--geometry=widthxheight(+|-)x(+|-)y       "+tr("Standard unix geometry argument")+"\n"+
                "\t[--download=]minlat,minlon,maxlat,maxlon  "+tr("Download the bounding box")+"\n"+
                "\t[--download=]<URL>                        "+tr("Download the location at the URL (with lat=x&lon=y&zoom=z)")+"\n"+
                "\t[--download=]<filename>                   "+tr("Open a file (any file type that can be opened with File/Open)")+"\n"+
                "\t--downloadgps=minlat,minlon,maxlat,maxlon "+tr("Download the bounding box as raw GPS")+"\n"+
                "\t--downloadgps=<URL>                       "+tr("Download the location at the URL (with lat=x&lon=y&zoom=z) as raw GPS")+"\n"+
                "\t--selection=<searchstring>                "+tr("Select with the given search")+"\n"+
                "\t--[no-]maximize                           "+tr("Launch in maximized mode")+"\n"+
                "\t--reset-preferences                       "+tr("Reset the preferences to default")+"\n\n"+
                "\t--load-preferences=<url-to-xml>           "+tr("Changes preferences according to the XML file")+"\n\n"+
                "\t--set=<key>=<value>                       "+tr("Set preference key to value")+"\n\n"+
                "\t--language=<language>                     "+tr("Set the language")+"\n\n"+
                "\t--version                                 "+tr("Displays the JOSM version and exits")+"\n\n"+
                "\t--debug                                   "+tr("Print debugging messages to console")+"\n\n"+
                "\t--skip-plugins                            "+tr("Skip loading plugins")+"\n\n"+
                "\t--offline=<osm_api|josm_website|all>      "+tr("Disable access to the given resource(s), separated by comma")+"\n\n"+
                tr("options provided as Java system properties")+":\n"+
                "\t-Djosm.pref="    +tr("/PATH/TO/JOSM/PREF    ")+tr("Set the preferences directory")+"\n\n"+
                "\t-Djosm.userdata="+tr("/PATH/TO/JOSM/USERDATA")+tr("Set the user data directory")+"\n\n"+
                "\t-Djosm.cache="   +tr("/PATH/TO/JOSM/CACHE   ")+tr("Set the cache directory")+"\n\n"+
                "\t-Djosm.home="    +tr("/PATH/TO/JOSM/HOMEDIR ")+
                tr("Relocate all 3 directories to homedir. Cache directory will be in homedir/cache")+"\n\n"+
                tr("-Djosm.home has lower precedence, i.e. the specific setting overrides the general one")+"\n\n"+
                tr("note: For some tasks, JOSM needs a lot of memory. It can be necessary to add the following\n" +
                        "      Java option to specify the maximum size of allocated memory in megabytes")+":\n"+
                        "\t-Xmx...m\n\n"+
                        tr("examples")+":\n"+
                        "\tjava -jar josm.jar track1.gpx track2.gpx london.osm\n"+
                        "\tjava -jar josm.jar "+OsmUrlToBounds.getURL(43.2, 11.1, 13)+"\n"+
                        "\tjava -jar josm.jar london.osm --selection=http://www.ostertag.name/osm/OSM_errors_node-duplicate.xml\n"+
                        "\tjava -jar josm.jar 43.2,11.1,43.4,11.4\n"+
                        "\tjava -Djosm.pref=$XDG_CONFIG_HOME -Djosm.userdata=$XDG_DATA_HOME -Djosm.cache=$XDG_CACHE_HOME -jar josm.jar\n"+
                        "\tjava -Djosm.home=/home/user/.josm_dev -jar josm.jar\n"+
                        "\tjava -Xmx1024m -jar josm.jar\n\n"+
                        tr("Parameters --download, --downloadgps, and --selection are processed in this order.")+"\n"+
                        tr("Make sure you load some data if you use --selection.")+"\n"
                );
    }

    /**
     * JOSM command line options.
     * @see <a href="https://josm.openstreetmap.de/wiki/Help/CommandLineOptions">Help/CommandLineOptions</a>
     * @since 5279
     */
    public enum Option {
        /** --help|-h                                  Show this help */
        HELP(false),
        /** --version                                  Displays the JOSM version and exits */
        VERSION(false),
        /** --debug                                    Print debugging messages to console */
        DEBUG(false),
        /** --trace                                    Print detailed debugging messages to console */
        TRACE(false),
        /** --language=&lt;language&gt;                Set the language */
        LANGUAGE(true),
        /** --reset-preferences                        Reset the preferences to default */
        RESET_PREFERENCES(false),
        /** --load-preferences=&lt;url-to-xml&gt;      Changes preferences according to the XML file */
        LOAD_PREFERENCES(true),
        /** --set=&lt;key&gt;=&lt;value&gt;            Set preference key to value */
        SET(true),
        /** --geometry=widthxheight(+|-)x(+|-)y        Standard unix geometry argument */
        GEOMETRY(true),
        /** --no-maximize                              Do not launch in maximized mode */
        NO_MAXIMIZE(false),
        /** --maximize                                 Launch in maximized mode */
        MAXIMIZE(false),
        /** --download=minlat,minlon,maxlat,maxlon     Download the bounding box <br>
         *  --download=&lt;URL&gt;                     Download the location at the URL (with lat=x&amp;lon=y&amp;zoom=z) <br>
         *  --download=&lt;filename&gt;                Open a file (any file type that can be opened with File/Open) */
        DOWNLOAD(true),
        /** --downloadgps=minlat,minlon,maxlat,maxlon  Download the bounding box as raw GPS <br>
         *  --downloadgps=&lt;URL&gt;                  Download the location at the URL (with lat=x&amp;lon=y&amp;zoom=z) as raw GPS */
        DOWNLOADGPS(true),
        /** --selection=&lt;searchstring&gt;           Select with the given search */
        SELECTION(true),
        /** --offline=&lt;osm_api|josm_website|all&gt; Disable access to the given resource(s), delimited by comma */
        OFFLINE(true),
        /** --skip-plugins */
        SKIP_PLUGINS(false);

        private final String name;
        private final boolean requiresArg;

        private Option(boolean requiresArgument) {
            this.name = name().toLowerCase(Locale.ENGLISH).replace("_", "-");
            this.requiresArg = requiresArgument;
        }

        /**
         * Replies the option name
         * @return The option name, in lowercase
         */
        public String getName() {
            return name;
        }

        /**
         * Determines if this option requires an argument.
         * @return {@code true} if this option requires an argument, {@code false} otherwise
         */
        public boolean requiresArgument() {
            return requiresArg;
        }
    }

    private static Map<Option, Collection<String>> buildCommandLineArgumentMap(String[] args) {

        List<LongOpt> los = new ArrayList<>();
        for (Option o : Option.values()) {
            los.add(new LongOpt(o.getName(), o.requiresArgument() ? LongOpt.REQUIRED_ARGUMENT : LongOpt.NO_ARGUMENT, null, 0));
        }

        Getopt g = new Getopt("JOSM", args, "hv", los.toArray(new LongOpt[los.size()]));

        Map<Option, Collection<String>> argMap = new EnumMap<>(Option.class);

        int c;
        while ((c = g.getopt()) != -1) {
            Option opt = null;
            switch (c) {
                case 'h':
                    opt = Option.HELP;
                    break;
                case 'v':
                    opt = Option.VERSION;
                    break;
                case 0:
                    opt = Option.values()[g.getLongind()];
                    break;
            }
            if (opt != null) {
                Collection<String> values = argMap.get(opt);
                if (values == null) {
                    values = new ArrayList<>();
                    argMap.put(opt, values);
                }
                values.add(g.getOptarg());
            } else
                throw new IllegalArgumentException("Invalid option: "+c);
        }
        // positional arguments are a shortcut for the --download ... option
        for (int i = g.getOptind(); i < args.length; ++i) {
            Collection<String> values = argMap.get(Option.DOWNLOAD);
            if (values == null) {
                values = new ArrayList<>();
                argMap.put(Option.DOWNLOAD, values);
            }
            values.add(args[i]);
        }

        return argMap;
    }

    /**
     * Main application Startup
     * @param argArray Command-line arguments
     */
    public static void main(final String[] argArray) {
        I18n.init();
        Main.checkJavaVersion();

        // construct argument table
        Map<Option, Collection<String>> args = null;
        try {
            args = buildCommandLineArgumentMap(argArray);
        } catch (IllegalArgumentException e) {
            System.exit(1);
            return;
        }

        final boolean languageGiven = args.containsKey(Option.LANGUAGE);

        if (languageGiven) {
            I18n.set(args.get(Option.LANGUAGE).iterator().next());
        }

        initApplicationPreferences();

        Policy.setPolicy(new Policy() {
            // Permissions for plug-ins loaded when josm is started via webstart
            private PermissionCollection pc;

            {
                pc = new Permissions();
                pc.add(new AllPermission());
            }

            @Override
            public PermissionCollection getPermissions(CodeSource codesource) {
                return pc;
            }
        });

        Thread.setDefaultUncaughtExceptionHandler(new BugReportExceptionHandler());

        // initialize the platform hook, and
        Main.determinePlatformHook();
        // call the really early hook before we do anything else
        Main.platform.preStartupHook();

        Main.COMMAND_LINE_ARGS.addAll(Arrays.asList(argArray));

        if (args.containsKey(Option.VERSION)) {
            System.out.println(Version.getInstance().getAgentString());
            System.exit(0);
        }

        if (args.containsKey(Option.DEBUG) || args.containsKey(Option.TRACE)) {
            // Enable JOSM debug level
            logLevel = 4;
            Main.info(tr("Printing debugging messages to console"));
        }

        boolean skipLoadingPlugins = false;
        if (args.containsKey(Option.SKIP_PLUGINS)) {
            skipLoadingPlugins = true;
            Main.info(tr("Plugin loading skipped"));
        }

        if (args.containsKey(Option.TRACE)) {
            // Enable JOSM debug level
            logLevel = 5;
            // Enable debug in OAuth signpost via system preference, but only at trace level
            Utils.updateSystemProperty("debug", "true");
            Main.info(tr("Enabled detailed debug level (trace)"));
        }

        Main.pref.init(args.containsKey(Option.RESET_PREFERENCES));

        if (args.containsKey(Option.SET)) {
            for (String i : args.get(Option.SET)) {
                String[] kv = i.split("=", 2);
                Main.pref.put(kv[0], "null".equals(kv[1]) ? null : kv[1]);
            }
        }

        if (!languageGiven) {
            I18n.set(Main.pref.get("language", null));
        }
        Main.pref.updateSystemProperties();

        checkIPv6();

        // asking for help? show help and exit
        if (args.containsKey(Option.HELP)) {
            showHelp();
            System.exit(0);
        }

        processOffline(args);

        Main.platform.afterPrefStartupHook();

        FontsManager.initialize();

        I18n.setupLanguageFonts();

        final JFrame mainFrame = new JFrame(tr("Java OpenStreetMap Editor"));
        Main.parent = mainFrame;

        if (args.containsKey(Option.LOAD_PREFERENCES)) {
            CustomConfigurator.XMLCommandProcessor config = new CustomConfigurator.XMLCommandProcessor(Main.pref);
            for (String i : args.get(Option.LOAD_PREFERENCES)) {
                info("Reading preferences from " + i);
                try (InputStream is = Utils.openURL(new URL(i))) {
                    config.openAndReadXML(is);
                } catch (Exception ex) {
                    throw new RuntimeException(ex);
                }
            }
        }

        DefaultAuthenticator.createInstance();
        Authenticator.setDefault(DefaultAuthenticator.getInstance());
        DefaultProxySelector proxySelector = new DefaultProxySelector(ProxySelector.getDefault());
        ProxySelector.setDefault(proxySelector);
        OAuthAccessTokenHolder.getInstance().init(Main.pref, CredentialsManager.getInstance());

        final SplashScreen splash = new SplashScreen();
        final SplashScreen.SplashProgressMonitor monitor = splash.getProgressMonitor();
        monitor.beginTask(tr("Initializing"));
        splash.setVisible(Main.pref.getBoolean("draw.splashscreen", true));
        Main.setInitStatusListener(new InitStatusListener() {

            @Override
            public Object updateStatus(String event) {
                monitor.beginTask(event);
                return event;
            }

            @Override
            public void finish(Object status) {
                if (status instanceof String) {
                    monitor.finishTask((String) status);
                }
            }
        });

        Collection<PluginInformation> pluginsToLoad = null;


        if (!skipLoadingPlugins) {
            pluginsToLoad = PluginHandler.buildListOfPluginsToLoad(splash, monitor.createSubTaskMonitor(1, false));
            if (!pluginsToLoad.isEmpty() && PluginHandler.checkAndConfirmPluginUpdate(splash)) {
                monitor.subTask(tr("Updating plugins"));
                pluginsToLoad = PluginHandler.updatePlugins(splash, null, monitor.createSubTaskMonitor(1, false), false);
            }

            monitor.indeterminateSubTask(tr("Installing updated plugins"));
            PluginHandler.installDownloadedPlugins(true);

            monitor.indeterminateSubTask(tr("Loading early plugins"));
            PluginHandler.loadEarlyPlugins(splash, pluginsToLoad, monitor.createSubTaskMonitor(1, false));
        }

        monitor.indeterminateSubTask(tr("Setting defaults"));
        preConstructorInit(args);

        monitor.indeterminateSubTask(tr("Creating main GUI"));
        final Main main = new MainApplication(mainFrame);

        if (!skipLoadingPlugins) {
            monitor.indeterminateSubTask(tr("Loading plugins"));
            PluginHandler.loadLatePlugins(splash, pluginsToLoad,  monitor.createSubTaskMonitor(1, false));
            toolbar.refreshToolbarControl();
        }

        // Wait for splash disappearance (fix #9714)
        GuiHelper.runInEDTAndWait(new Runnable() {
            @Override
            public void run() {
                splash.setVisible(false);
                splash.dispose();
                mainFrame.setVisible(true);
                main.gettingStarted.requestFocusInWindow();
            }
        });

        Main.MasterWindowListener.setup();

        boolean maximized = Main.pref.getBoolean("gui.maximized", false);
        if ((!args.containsKey(Option.NO_MAXIMIZE) && maximized) || args.containsKey(Option.MAXIMIZE)) {
            if (Toolkit.getDefaultToolkit().isFrameStateSupported(JFrame.MAXIMIZED_BOTH)) {
                Main.windowState = JFrame.MAXIMIZED_BOTH;
                mainFrame.setExtendedState(Main.windowState);
            } else {
                Main.debug("Main window: maximizing not supported");
            }
        }
        if (main.menu.fullscreenToggleAction != null) {
            main.menu.fullscreenToggleAction.initial();
        }

        SwingUtilities.invokeLater(new GuiFinalizationWorker(args, proxySelector));

        if (Main.isPlatformWindows()) {
            try {
                // Check for insecure certificates to remove.
                // This is Windows-dependant code but it can't go to preStartupHook (need i18n)
                // neither startupHook (need to be called before remote control)
                PlatformHookWindows.removeInsecureCertificates();
            } catch (NoSuchAlgorithmException | CertificateException | KeyStoreException | IOException e) {
                error(e);
            }
        }

        if (RemoteControl.PROP_REMOTECONTROL_ENABLED.get()) {
            RemoteControl.start();
        }

        if (MessageNotifier.PROP_NOTIFIER_ENABLED.get()) {
            MessageNotifier.start();
        }

        if (Main.pref.getBoolean("debug.edt-checker.enable", Version.getInstance().isLocalBuild())) {
            // Repaint manager is registered so late for a reason - there is lots of violation during startup process
            // but they don't seem to break anything and are difficult to fix
            info("Enabled EDT checker, wrongful access to gui from non EDT thread will be printed to console");
            RepaintManager.setCurrentManager(new CheckThreadViolationRepaintManager());
        }
    }

    private static void processOffline(Map<Option, Collection<String>> args) {
        if (args.containsKey(Option.OFFLINE)) {
            for (String s : args.get(Option.OFFLINE).iterator().next().split(",")) {
                try {
                    Main.setOffline(OnlineResource.valueOf(s.toUpperCase(Locale.ENGLISH)));
                } catch (IllegalArgumentException e) {
                    Main.error(tr("''{0}'' is not a valid value for argument ''{1}''. Possible values are {2}, possibly delimited by commas.",
                            s.toUpperCase(Locale.ENGLISH), Option.OFFLINE.getName(), Arrays.toString(OnlineResource.values())));
                    System.exit(1);
                    return;
                }
            }
            Set<OnlineResource> offline = Main.getOfflineResources();
            if (!offline.isEmpty()) {
                Main.warn(trn("JOSM is running in offline mode. This resource will not be available: {0}",
                        "JOSM is running in offline mode. These resources will not be available: {0}",
                        offline.size(), offline.size() == 1 ? offline.iterator().next() : Arrays.toString(offline.toArray())));
            }
        }
    }

    /**
     * Check if IPv6 can be safely enabled and do so. Because this cannot be done after network activation,
     * disabling or enabling IPV6 may only be done with next start.
     */
    private static void checkIPv6() {
        if ("auto".equals(Main.pref.get("prefer.ipv6", "auto"))) {
             new Thread(new Runnable() { /* this may take some time (DNS, Connect) */
                public void run() {
                    boolean hasv6 = false;
                    boolean wasv6 = Main.pref.getBoolean("validated.ipv6", false);
                    try {
                        /* Use the check result from last run of the software, as after the test, value
                           changes have no effect anymore */
                        if (wasv6) {
                            Utils.updateSystemProperty("java.net.preferIPv6Addresses", "true");
                        }
                        for (InetAddress a : InetAddress.getAllByName("josm.openstreetmap.de")) {
                            if (a instanceof Inet6Address) {
                                if (a.isReachable(1000)) {
                                    Utils.updateSystemProperty("java.net.preferIPv6Addresses", "true");
                                    if (!wasv6) {
                                        Main.info(tr("Detected useable IPv6 network, prefering IPv6 over IPv4 after next restart."));
                                    } else {
                                        Main.info(tr("Detected useable IPv6 network, prefering IPv6 over IPv4."));
                                    }
                                    hasv6 = true;
                                }
                                break; /* we're done */
                            }
                        }
                    } catch (IOException | SecurityException e) {
                        if (Main.isDebugEnabled()) {
                            Main.debug("Exception while checking IPv6 connectivity: "+e);
                        }
                    }
                    if (wasv6 && !hasv6) {
                        Main.info(tr("Detected no useable IPv6 network, prefering IPv4 over IPv6 after next restart."));
                    }
                    Main.pref.put("validated.ipv6", hasv6);
                }
            }).start();
        }
    }

    private static class GuiFinalizationWorker implements Runnable {

        private final Map<Option, Collection<String>> args;
        private final DefaultProxySelector proxySelector;

        public GuiFinalizationWorker(Map<Option, Collection<String>> args, DefaultProxySelector proxySelector) {
            this.args = args;
            this.proxySelector = proxySelector;
        }

        @Override
        public void run() {

            // Handle proxy/network errors early to inform user he should change settings to be able to use JOSM correctly
            if (!handleProxyErrors()) {
                handleNetworkErrors();
            }

            // Restore autosave layers after crash and start autosave thread
            handleAutosave();

            // Handle command line instructions
            postConstructorProcessCmdLine(args);

            // Show download dialog if autostart is enabled
            DownloadDialog.autostartIfNeeded();
        }

        private void handleAutosave() {
            if (AutosaveTask.PROP_AUTOSAVE_ENABLED.get()) {
                AutosaveTask autosaveTask = new AutosaveTask();
                List<File> unsavedLayerFiles = autosaveTask.getUnsavedLayersFiles();
                if (!unsavedLayerFiles.isEmpty()) {
                    ExtendedDialog dialog = new ExtendedDialog(
                            Main.parent,
                            tr("Unsaved osm data"),
                            new String[] {tr("Restore"), tr("Cancel"), tr("Discard")}
                            );
                    dialog.setContent(
                            trn("JOSM found {0} unsaved osm data layer. ",
                                    "JOSM found {0} unsaved osm data layers. ", unsavedLayerFiles.size(), unsavedLayerFiles.size()) +
                                    tr("It looks like JOSM crashed last time. Would you like to restore the data?"));
                    dialog.setButtonIcons(new String[] {"ok", "cancel", "dialogs/delete"});
                    int selection = dialog.showDialog().getValue();
                    if (selection == 1) {
                        autosaveTask.recoverUnsavedLayers();
                    } else if (selection == 3) {
                        autosaveTask.discardUnsavedLayers();
                    }
                }
                autosaveTask.schedule();
            }
        }

        private boolean handleNetworkOrProxyErrors(boolean hasErrors, String title, String message) {
            if (hasErrors) {
                ExtendedDialog ed = new ExtendedDialog(
                        Main.parent, title,
                        new String[]{tr("Change proxy settings"), tr("Cancel")});
                ed.setButtonIcons(new String[]{"dialogs/settings", "cancel"}).setCancelButton(2);
                ed.setMinimumSize(new Dimension(460, 260));
                ed.setIcon(JOptionPane.WARNING_MESSAGE);
                ed.setContent(message);

                if (ed.showDialog().getValue() == 1) {
                    PreferencesAction.forPreferenceSubTab(null, null, ProxyPreference.class).run();
                }
            }
            return hasErrors;
        }

        private boolean handleProxyErrors() {
            return handleNetworkOrProxyErrors(proxySelector.hasErrors(), tr("Proxy errors occurred"),
                    tr("JOSM tried to access the following resources:<br>" +
                            "{0}" +
                            "but <b>failed</b> to do so, because of the following proxy errors:<br>" +
                            "{1}" +
                            "Would you like to change your proxy settings now?",
                            Utils.joinAsHtmlUnorderedList(proxySelector.getErrorResources()),
                            Utils.joinAsHtmlUnorderedList(proxySelector.getErrorMessages())
                    ));
        }

        private boolean handleNetworkErrors() {
            boolean condition = !NETWORK_ERRORS.isEmpty();
            if (condition) {
                Set<String> errors = new TreeSet<>();
                for (Throwable t : NETWORK_ERRORS.values()) {
                    errors.add(t.toString());
                }
                return handleNetworkOrProxyErrors(condition, tr("Network errors occurred"),
                        tr("JOSM tried to access the following resources:<br>" +
                                "{0}" +
                                "but <b>failed</b> to do so, because of the following network errors:<br>" +
                                "{1}" +
                                "It may be due to a missing proxy configuration.<br>" +
                                "Would you like to change your proxy settings now?",
                                Utils.joinAsHtmlUnorderedList(NETWORK_ERRORS.keySet()),
                                Utils.joinAsHtmlUnorderedList(errors)
                        ));
            }
            return false;
        }
    }
}
