/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
 * ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is Mozilla Android code.
 *
 * The Initial Developer of the Original Code is Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Vladimir Vukicevic <vladimir@pobox.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

package org.mozilla.gecko;

import java.io.*;
import java.util.*;
import java.util.zip.*;
import java.nio.*;
import java.lang.reflect.*;
import java.text.*;

import android.os.*;
import android.app.*;
import android.text.*;
import android.view.*;
import android.view.inputmethod.*;
import android.content.*;
import android.content.res.*;
import android.content.pm.*;
import android.graphics.*;
import android.widget.*;
import android.hardware.*;
import android.location.*;

import android.util.*;
import android.net.Uri;

class GeckoAppShell
{
    // static members only
    private GeckoAppShell() { }

    static private LinkedList<GeckoEvent> gPendingEvents =
        new LinkedList<GeckoEvent>();

    static private boolean gRestartScheduled = false;

    static private final Timer mIMETimer = new Timer();
    static private final HashMap<Integer, AlertNotification>
         mAlertNotifications = new HashMap<Integer, AlertNotification>();

    static private final int NOTIFY_IME_RESETINPUTSTATE = 0;
    static private final int NOTIFY_IME_SETOPENSTATE = 1;
    static private final int NOTIFY_IME_CANCELCOMPOSITION = 2;
    static private final int NOTIFY_IME_FOCUSCHANGE = 3;

    static public final long kFreeSpaceThreshold = 157286400L; // 150MB
    static private final long kLibFreeSpaceBuffer = 20971520L; // 29MB
    static private File sCacheFile = null;
    static private int sFreeSpace = -1;

    /* The Android-side API: API methods that Android calls */

    // Initialization methods
    public static native void nativeInit();
    public static native void nativeRun(String args);

    // helper methods
    public static native void setSurfaceView(GeckoSurfaceView sv);
    public static native void putenv(String map);
    public static native void onResume();
    public static native void onLowMemory();
    public static native void callObserver(String observerKey, String topic, String data);
    public static native void removeObserver(String observerKey);
    public static native void loadLibs(String apkName, boolean shouldExtract);

    public static File getCacheDir() {
        if (sCacheFile == null)
            sCacheFile = GeckoApp.mAppContext.getCacheDir();
        return sCacheFile;
    }

    public static long getFreeSpace() {
        if (sFreeSpace == -1) {
            StatFs cacheStats = new StatFs(getCacheDir().getPath());
            sFreeSpace = cacheStats.getFreeBlocks() * 
                cacheStats.getBlockSize();
        }
        return sFreeSpace;
    }

    // java-side stuff
    public static void loadGeckoLibs(String apkName) {
        // The package data lib directory isn't placed in ld.so's
        // search path, so we have to manually load libraries that
        // libxul will depend on.  Not ideal.
        System.loadLibrary("mozutils");

                
        Intent i = GeckoApp.mAppContext.getIntent();
        String env = i.getStringExtra("env0");
        Log.i("GeckoApp", "env0: "+ env);
        for (int c = 1; env != null; c++) {
            GeckoAppShell.putenv(env);
            env = i.getStringExtra("env" + c);
            Log.i("GeckoApp", "env"+ c +": "+ env);
        }

        File f = new File("/data/data/" + 
                          GeckoApp.mAppContext.getPackageName() + "/tmp");
        if (!f.exists())
            f.mkdirs();

        GeckoAppShell.putenv("TMPDIR=" + f.getPath());

        f = Environment.getDownloadCacheDirectory();
        GeckoAppShell.putenv("EXTERNAL_STORAGE=" + f.getPath());

        File cacheFile = getCacheDir();
        GeckoAppShell.putenv("CACHE_PATH=" + cacheFile.getPath());

        // gingerbread introduces File.getUsableSpace(). We should use that.
        long freeSpace = getFreeSpace();
        try {
            File downloadDir = null;
            if (Build.VERSION.SDK_INT >= 8)
                downloadDir = GeckoApp.mAppContext.getExternalFilesDir(Environment.DIRECTORY_DOWNLOADS);
            else
                downloadDir = new File(Environment.getExternalStorageDirectory().getPath(), "download");
            GeckoAppShell.putenv("DOWNLOADS_DIRECTORY=" + downloadDir.getPath());
        }
        catch (Exception e) {
            Log.i("GeckoApp", "No download directory has been found: " + e);
        }

        putLocaleEnv();

        if (freeSpace + kLibFreeSpaceBuffer < kFreeSpaceThreshold) {
            // remove any previously extracted libs since we're apparently low
            Iterator cacheFiles = Arrays.asList(cacheFile.listFiles()).iterator();
            while (cacheFiles.hasNext()) {
                File libFile = (File)cacheFiles.next();
                if (libFile.getName().endsWith(".so"))
                    libFile.delete();
            }
        }
        loadLibs(apkName, freeSpace > kFreeSpaceThreshold);
    }

    private static void putLocaleEnv() {
        GeckoAppShell.putenv("LANG=" + Locale.getDefault().toString());
        NumberFormat nf = NumberFormat.getInstance();
        if (nf instanceof DecimalFormat) {
            DecimalFormat df = (DecimalFormat)nf;
            DecimalFormatSymbols dfs = df.getDecimalFormatSymbols();

            GeckoAppShell.putenv("LOCALE_DECIMAL_POINT=" + dfs.getDecimalSeparator());
            GeckoAppShell.putenv("LOCALE_THOUSANDS_SEP=" + dfs.getGroupingSeparator());
            GeckoAppShell.putenv("LOCALE_GROUPING=" + (char)df.getGroupingSize());
        }
    }

    public static void runGecko(String apkPath, String args, String url) {
        // run gecko -- it will spawn its own thread
        GeckoAppShell.nativeInit();

        // Tell Gecko where the target surface view is for rendering
        GeckoAppShell.setSurfaceView(GeckoApp.surfaceView);

        // First argument is the .apk path
        String combinedArgs = apkPath + " -omnijar " + apkPath;
        if (args != null)
            combinedArgs += " " + args;
        if (url != null)
            combinedArgs += " " + url;
        // and go
        GeckoAppShell.nativeRun(combinedArgs);
    }

    private static GeckoEvent mLastDrawEvent;

    private static void sendPendingEventsToGecko() {
        try {
            while (!gPendingEvents.isEmpty()) {
                GeckoEvent e = gPendingEvents.removeFirst();
                notifyGeckoOfEvent(e);
            }
        } catch (NoSuchElementException e) {}
    }
 
    public static void sendEventToGecko(GeckoEvent e) {
        if (GeckoApp.checkLaunchState(GeckoApp.LaunchState.GeckoRunning)) {
            notifyGeckoOfEvent(e);
        } else {
            gPendingEvents.addLast(e);
        }
    }

    // Tell the Gecko event loop that an event is available.
    public static native void notifyGeckoOfEvent(GeckoEvent event);

    /*
     *  The Gecko-side API: API methods that Gecko calls
     */
    public static void scheduleRedraw() {
        // Redraw everything
        scheduleRedraw(0, -1, -1, -1, -1);
    }

    public static void scheduleRedraw(int nativeWindow, int x, int y, int w, int h) {
        GeckoEvent e;

        if (x == -1) {
            e = new GeckoEvent(GeckoEvent.DRAW, null);
        } else {
            e = new GeckoEvent(GeckoEvent.DRAW, new Rect(x, y, w, h));
        }

        e.mNativeWindow = nativeWindow;

        sendEventToGecko(e);
    }

    /* Delay updating IME states (see bug 573800) */
    private static final class IMEStateUpdater extends TimerTask
    {
        static private IMEStateUpdater instance;
        private boolean mEnable, mReset;

        static private IMEStateUpdater getInstance() {
            if (instance == null) {
                instance = new IMEStateUpdater();
                mIMETimer.schedule(instance, 200);
            }
            return instance;
        }

        static public synchronized void enableIME() {
            getInstance().mEnable = true;
        }

        static public synchronized void resetIME() {
            getInstance().mReset = true;
        }

        public void run() {
            synchronized(IMEStateUpdater.class) {
                instance = null;
            }

            InputMethodManager imm = (InputMethodManager) 
                GeckoApp.surfaceView.getContext().getSystemService(
                    Context.INPUT_METHOD_SERVICE);
            if (imm == null)
                return;

            if (mReset)
                imm.restartInput(GeckoApp.surfaceView);

            if (!mEnable)
                return;

            if (GeckoApp.surfaceView.mIMEState !=
                    GeckoSurfaceView.IME_STATE_DISABLED)
                imm.showSoftInput(GeckoApp.surfaceView, 0);
            else
                imm.hideSoftInputFromWindow(
                    GeckoApp.surfaceView.getWindowToken(), 0);
        }
    }

    public static void notifyIME(int type, int state) {
        if (GeckoApp.surfaceView == null)
            return;

        switch (type) {
        case NOTIFY_IME_RESETINPUTSTATE:
            GeckoApp.surfaceView.inputConnection.finishComposingText();
            IMEStateUpdater.resetIME();
            // keep current enabled state
            IMEStateUpdater.enableIME();
            break;

        case NOTIFY_IME_CANCELCOMPOSITION:
            IMEStateUpdater.resetIME();
            break;

        case NOTIFY_IME_FOCUSCHANGE:
            GeckoApp.surfaceView.mIMEFocus = state != 0;
            IMEStateUpdater.resetIME();
            break;
        }
    }

    public static void notifyIMEEnabled(int state, String typeHint, 
                                        String actionHint) {
        if (GeckoApp.surfaceView == null)
            return;

        /* When IME is 'disabled', IME processing is disabled.
            In addition, the IME UI is hidden */
        GeckoApp.surfaceView.mIMEState = state;
        GeckoApp.surfaceView.mIMETypeHint = typeHint;
        GeckoApp.surfaceView.mIMEActionHint = actionHint;
        IMEStateUpdater.enableIME();
    }

    public static void notifyIMEChange(String text, int start, int end, int newEnd) {
        if (GeckoApp.surfaceView == null ||
            GeckoApp.surfaceView.inputConnection == null)
            return;

        InputMethodManager imm = (InputMethodManager) 
            GeckoApp.surfaceView.getContext().getSystemService(
                Context.INPUT_METHOD_SERVICE);
        if (imm == null)
            return;

        if (newEnd < 0)
            GeckoApp.surfaceView.inputConnection.notifySelectionChange(
                imm, start, end);
        else
            GeckoApp.surfaceView.inputConnection.notifyTextChange(
                imm, text, start, end, newEnd);
    }

    public static void enableAccelerometer(boolean enable) {
        SensorManager sm = (SensorManager) 
            GeckoApp.surfaceView.getContext().getSystemService(Context.SENSOR_SERVICE);

        if (enable) {
            Sensor accelSensor = sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
            if (accelSensor == null)
                return;

            sm.registerListener(GeckoApp.surfaceView, accelSensor, SensorManager.SENSOR_DELAY_GAME);
        } else {
            sm.unregisterListener(GeckoApp.surfaceView);
        }
    }

    public static void enableLocation(boolean enable) {
        LocationManager lm = (LocationManager)
            GeckoApp.surfaceView.getContext().getSystemService(Context.LOCATION_SERVICE);

        if (enable) {
            Criteria crit = new Criteria();
            crit.setAccuracy(Criteria.ACCURACY_FINE);
            String provider = lm.getBestProvider(crit, true);
            if (provider == null)
                return;

            Location loc = lm.getLastKnownLocation(provider);
            if (loc != null)
                sendEventToGecko(new GeckoEvent(loc));
            lm.requestLocationUpdates(provider, 100, (float).5, GeckoApp.surfaceView, Looper.getMainLooper());
        } else {
            lm.removeUpdates(GeckoApp.surfaceView);
        }
    }

    public static void moveTaskToBack() {
        GeckoApp.mAppContext.moveTaskToBack(true);
    }

    public static void returnIMEQueryResult(String result, int selectionStart, int selectionLength) {
        GeckoApp.surfaceView.inputConnection.mSelectionStart = selectionStart;
        GeckoApp.surfaceView.inputConnection.mSelectionLength = selectionLength;
        try {
            GeckoApp.surfaceView.inputConnection.mQueryResult.put(result);
        } catch (InterruptedException e) {
        }
    }

    static void onAppShellReady()
    {
        // mLaunchState can only be Launched at this point
        GeckoApp.setLaunchState(GeckoApp.LaunchState.GeckoRunning);
        sendPendingEventsToGecko();
    }

    static void onXreExit() {
        // mLaunchState can only be Launched or GeckoRunning at this point
        GeckoApp.setLaunchState(GeckoApp.LaunchState.GeckoExiting);
        Log.i("GeckoAppJava", "XRE exited");
        if (gRestartScheduled) {
            GeckoApp.mAppContext.doRestart();
        } else {
            Log.i("GeckoAppJava", "we're done, good bye");
            GeckoApp.mAppContext.finish();
            System.exit(0);
        }

    }
    static void scheduleRestart() {
        Log.i("GeckoAppJava", "scheduling restart");
        gRestartScheduled = true;        
    }
 
    // "Installs" an application by creating a shortcut
    static void installWebApplication(String aURI, String aTitle, String aIconData) {
        Log.w("GeckoAppJava", "installWebApplication for " + aURI + " [" + aTitle + "]");

        // the intent to be launched by the shortcut
        Intent shortcutIntent = new Intent("org.mozilla.fennec.WEBAPP");
        shortcutIntent.setClassName(GeckoApp.mAppContext,
                                    GeckoApp.mAppContext.getPackageName() + ".App");
        shortcutIntent.putExtra("args", "--webapp=" + aURI);
        
        Intent intent = new Intent();
        intent.putExtra(Intent.EXTRA_SHORTCUT_INTENT, shortcutIntent);
        intent.putExtra(Intent.EXTRA_SHORTCUT_NAME, aTitle);
        byte[] raw = Base64.decode(aIconData.substring(22), Base64.DEFAULT);
        Bitmap bitmap = BitmapFactory.decodeByteArray(raw, 0, raw.length);
        intent.putExtra(Intent.EXTRA_SHORTCUT_ICON, bitmap);
        intent.setAction("com.android.launcher.action.INSTALL_SHORTCUT");
        GeckoApp.mAppContext.sendBroadcast(intent);
    }
    
    static String[] getHandlersForMimeType(String aMimeType, String aAction) {
        Intent intent = getIntentForActionString(aAction);
        if (aMimeType != null && aMimeType.length() > 0)
            intent.setType(aMimeType);
        return getHandlersForIntent(intent);
    }

    static String[] getHandlersForURL(String aURL, String aAction) {
        // aURL may contain the whole URL or just the protocol
        Uri uri = aURL.indexOf(':') >= 0 ? Uri.parse(aURL) : new Uri.Builder().scheme(aURL).build();
        Intent intent = getIntentForActionString(aAction);
        intent.setData(uri);
        return getHandlersForIntent(intent);
    }

    static String[] getHandlersForIntent(Intent intent) {
        PackageManager pm = 
            GeckoApp.surfaceView.getContext().getPackageManager();
        List<ResolveInfo> list = pm.queryIntentActivities(intent, 0);
        int numAttr = 4;
        String[] ret = new String[list.size() * numAttr];
        for (int i = 0; i < list.size(); i++) {
            ResolveInfo resolveInfo = list.get(i);
            ret[i * numAttr] = resolveInfo.loadLabel(pm).toString();
            if (resolveInfo.isDefault)
                ret[i * numAttr + 1] = "default";
            else
                ret[i * numAttr + 1] = "";
            ret[i * numAttr + 2] = resolveInfo.activityInfo.applicationInfo.packageName;
            ret[i * numAttr + 3] = resolveInfo.activityInfo.name;
        }
        return ret;
    }

    static Intent getIntentForActionString(String aAction) {
        // Default to the view action if no other action as been specified.
        if (aAction != null && aAction.length() > 0)
            return new Intent(aAction);
        else
            return new Intent(Intent.ACTION_VIEW);
    }

    static String getMimeTypeFromExtensions(String aFileExt) {
        android.webkit.MimeTypeMap mtm =
            android.webkit.MimeTypeMap.getSingleton();
        StringTokenizer st = new StringTokenizer(aFileExt, "., ");
        String type = null;
        String subType = null;
        while (st.hasMoreElements()) {
            String ext = st.nextToken();
            String mt = mtm.getMimeTypeFromExtension(ext);
            if (mt == null)
                continue;
            int slash = mt.indexOf('/');
            String tmpType = mt.substring(0, slash);
            if (!tmpType.equalsIgnoreCase(type))
                type = type == null ? tmpType : "*";
            String tmpSubType = mt.substring(slash + 1);
            if (!tmpSubType.equalsIgnoreCase(subType))
                subType = subType == null ? tmpSubType : "*";
        }
        if (type == null)
            type = "*";
        if (subType == null)
            subType = "*";
        return type + "/" + subType;
    }

    static boolean openUriExternal(String aUriSpec, String aMimeType, String aPackageName, 
                                   String aClassName, String aAction, String aTitle) {
        Intent intent = getIntentForActionString(aAction);
        if (aAction.equalsIgnoreCase(Intent.ACTION_SEND)) {
            intent.putExtra(Intent.EXTRA_TEXT, aUriSpec);
            intent.putExtra(Intent.EXTRA_SUBJECT, aTitle);
            if (aMimeType != null && aMimeType.length() > 0)
                intent.setType(aMimeType);
        } else if (aMimeType.length() > 0) {
            intent.setDataAndType(Uri.parse(aUriSpec), aMimeType);
        } else {
            intent.setData(Uri.parse(aUriSpec));
        }
        if (aPackageName.length() > 0 && aClassName.length() > 0)
            intent.setClassName(aPackageName, aClassName);

        intent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        try {
            GeckoApp.surfaceView.getContext().startActivity(intent);
            return true;
        } catch(ActivityNotFoundException e) {
            return false;
        }
    }

    static String getClipboardText() {
        Context context = GeckoApp.surfaceView.getContext();
        ClipboardManager cm = (ClipboardManager)
            context.getSystemService(Context.CLIPBOARD_SERVICE);
        if (!cm.hasText())
            return null;
        return cm.getText().toString();
    }

    static void setClipboardText(String text) {
        Context context = GeckoApp.surfaceView.getContext();
        ClipboardManager cm = (ClipboardManager)
            context.getSystemService(Context.CLIPBOARD_SERVICE);
        cm.setText(text);
    }

    public static void showAlertNotification(String aImageUrl, String aAlertTitle, String aAlertText,
                                             String aAlertCookie, String aAlertName) {
        Log.i("GeckoAppJava", "GeckoAppShell.showAlertNotification\n" +
            "- image = '" + aImageUrl + "'\n" +
            "- title = '" + aAlertTitle + "'\n" +
            "- text = '" + aAlertText +"'\n" +
            "- cookie = '" + aAlertCookie +"'\n" +
            "- name = '" + aAlertName + "'");

        int icon = R.drawable.icon; // Just use the app icon by default

        Uri imageUri = Uri.parse(aImageUrl);
        String scheme = imageUri.getScheme();
        if ("drawable".equals(scheme)) {
            String resource = imageUri.getSchemeSpecificPart();
            resource = resource.substring(resource.lastIndexOf('/') + 1);
            try {
                Class drawableClass = R.drawable.class;
                Field f = drawableClass.getField(resource);
                icon = f.getInt(null);
            } catch (Exception e) {} // just means the resource doesn't exist
        }

        int notificationID = aAlertName.hashCode();

        // Remove the old notification with the same ID, if any
        removeNotification(notificationID);

        AlertNotification notification = new AlertNotification(GeckoApp.mAppContext,
            notificationID, icon, aAlertTitle, System.currentTimeMillis());

        // The intent to launch when the user clicks the expanded notification
        Intent notificationIntent = new Intent(GeckoApp.ACTION_ALERT_CLICK);
        notificationIntent.setClassName(GeckoApp.mAppContext,
            GeckoApp.mAppContext.getPackageName() + ".NotificationHandler");

        // Put the strings into the intent as an URI "alert:<name>#<cookie>"
        Uri dataUri = Uri.fromParts("alert", aAlertName, aAlertCookie);
        notificationIntent.setData(dataUri);

        PendingIntent contentIntent = PendingIntent.getBroadcast(GeckoApp.mAppContext, 0, notificationIntent, 0);
        notification.setLatestEventInfo(GeckoApp.mAppContext, aAlertTitle, aAlertText, contentIntent);

        // The intent to execute when the status entry is deleted by the user with the "Clear All Notifications" button
        Intent clearNotificationIntent = new Intent(GeckoApp.ACTION_ALERT_CLEAR);
        clearNotificationIntent.setClassName(GeckoApp.mAppContext,
            GeckoApp.mAppContext.getPackageName() + ".NotificationHandler");
        clearNotificationIntent.setData(dataUri);
        notification.deleteIntent = PendingIntent.getBroadcast(GeckoApp.mAppContext, 0, clearNotificationIntent, 0);

        mAlertNotifications.put(notificationID, notification);

        notification.show();

        Log.i("GeckoAppJava", "Created notification ID " + notificationID);
    }

    public static void alertsProgressListener_OnProgress(String aAlertName, long aProgress, long aProgressMax, String aAlertText) {
        Log.i("GeckoAppJava", "GeckoAppShell.alertsProgressListener_OnProgress\n" +
            "- name = '" + aAlertName +"', " +
            "progress = " + aProgress +" / " + aProgressMax + ", text = '" + aAlertText + "'");

        int notificationID = aAlertName.hashCode();
        AlertNotification notification = mAlertNotifications.get(notificationID);
        if (notification != null)
            notification.updateProgress(aAlertText, aProgress, aProgressMax);

        if (aProgress == aProgressMax) {
            // Hide the notification at 100%
            removeObserver(aAlertName);
            removeNotification(notificationID);
        }
    }

    public static void alertsProgressListener_OnCancel(String aAlertName) {
        Log.i("GeckoAppJava", "GeckoAppShell.alertsProgressListener_OnCancel('" + aAlertName + "'");

        removeObserver(aAlertName);

        int notificationID = aAlertName.hashCode();
        removeNotification(notificationID);
    }

    public static void handleNotification(String aAction, String aAlertName, String aAlertCookie) {
        int notificationID = aAlertName.hashCode();

        if (GeckoApp.ACTION_ALERT_CLICK.equals(aAction)) {
            Log.i("GeckoAppJava", "GeckoAppShell.handleNotification: callObserver(alertclickcallback)");
            callObserver(aAlertName, "alertclickcallback", aAlertCookie);

            AlertNotification notification = mAlertNotifications.get(notificationID);
            if (notification != null && notification.isProgressStyle()) {
                // When clicked, keep the notification, if it displays a progress
                return;
            }
        }

        callObserver(aAlertName, "alertfinished", aAlertCookie);

        removeObserver(aAlertName);

        removeNotification(notificationID);
    }

    private static void removeNotification(int notificationID) {
        mAlertNotifications.remove(notificationID);

        NotificationManager notificationManager = (NotificationManager)
           GeckoApp.mAppContext.getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.cancel(notificationID);
    }

    public static int getDpi() {
        DisplayMetrics metrics = new DisplayMetrics();
        GeckoApp.mAppContext.getWindowManager().getDefaultDisplay().getMetrics(metrics);
        return metrics.densityDpi;
    }

    public static void setFullScreen(boolean fullscreen) {
        GeckoApp.mFullscreen = fullscreen;

        // force a reconfiguration to hide/show the system bar
        GeckoApp.mAppContext.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
        GeckoApp.mAppContext.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
        GeckoApp.mAppContext.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_USER);
    }

    public static String showFilePicker(String aFilters) {
        return GeckoApp.mAppContext.
            showFilePicker(getMimeTypeFromExtensions(aFilters));
    }

    public static void performHapticFeedback(boolean aIsLongPress) {
        GeckoApp.surfaceView.
            performHapticFeedback(aIsLongPress ?
                                  HapticFeedbackConstants.LONG_PRESS :
                                  HapticFeedbackConstants.VIRTUAL_KEY);
    }

    public static void showInputMethodPicker() {
        InputMethodManager imm = (InputMethodManager) GeckoApp.surfaceView.getContext().getSystemService(Context.INPUT_METHOD_SERVICE);
        imm.showInputMethodPicker();       
    }

    public static void hideProgressDialog() {
        GeckoApp.surfaceView.mShowingSplashScreen = false;
    }

    public static void setKeepScreenOn(final boolean on) {
        GeckoApp.mAppContext.runOnUiThread(new Runnable() {
            public void run() {
                GeckoApp.surfaceView.setKeepScreenOn(on);
            }
        });
    }
}