/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012 Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify

  * it under the terms of the GNU General Public License as published by

  * the Free Software Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful,

  * but WITHOUT ANY WARRANTY; without even the implied warranty of

  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

  * GNU General Public License for more details.

  *

  * You should have received a copy of the GNU General Public License

  * along with this program. Look for COPYING file in the top folder.

  * If not, see http://opensource.org/licenses/GPL-2.0.

  */

 package org.apidesign.bck2brwsr.launcher;

 import org.apidesign.bck2brwsr.launcher.fximpl.FXBrwsr;

 import java.io.IOException;

 import java.io.InputStream;

 import java.lang.reflect.Method;

 import java.net.URI;

 import java.net.URL;

 import java.net.URLClassLoader;

 import java.util.Enumeration;

 import java.util.concurrent.Executors;

 import java.util.jar.Manifest;

 import java.util.logging.Level;

 import java.util.logging.Logger;

 import javafx.application.Platform;

 import org.apidesign.bck2brwsr.launcher.fximpl.JVMBridge;

 /**

  *

  * @author Jaroslav Tulach <jtulach@netbeans.org>

  */

 final class FXBrwsrLauncher extends BaseHTTPLauncher {

     private static final Logger LOG = Logger.getLogger(FXBrwsrLauncher.class.getName());

     static {

         try {

             Method m = URLClassLoader.class.getDeclaredMethod("addURL", URL.class);

             m.setAccessible(true);

             URL l = new URL("file://" + System.getProperty("java.home") + "/lib/jfxrt.jar");

             LOG.log(Level.INFO, "url : {0}", l);

             m.invoke(ClassLoader.getSystemClassLoader(), l);

         } catch (Exception ex) {

             throw new LinkageError("Can't add jfxrt.jar on the classpath", ex);

         }

     }

     public FXBrwsrLauncher(String ignore) {

         super(null);

     }

     @Override

     protected Object[] showBrwsr(final URI url) throws IOException {

         try {

             LOG.log(Level.INFO, "showBrwsr for {0}", url);

             JVMBridge.registerClassLoaders(loaders());

             LOG.info("About to launch WebView");

             Executors.newSingleThreadExecutor().submit(new Runnable() {

                 @Override

                 public void run() {

                     LOG.log(Level.INFO, "In FX thread. Launching!");

                     try {

                         FXBrwsr.launch(FXBrwsr.class, url.toString());

                         LOG.log(Level.INFO, "Launcher is back. Closing");

                         close();

                     } catch (Throwable ex) {

                         LOG.log(Level.WARNING, "Error launching Web View", ex);

                     }

                 }

             });

         } catch (Throwable ex) {

             LOG.log(Level.WARNING, "Can't open WebView", ex);

         }

         return null;

     }

     @Override

     void generateBck2BrwsrJS(StringBuilder sb, Res loader) throws IOException {

         sb.append("(function() {\n"

             + "  var impl = this.bck2brwsr;\n"

             + "  this.bck2brwsr = function() { return impl; };\n"

             + "})(window);\n"

         );

         JVMBridge.onBck2BrwsrLoad();

     }

     @Override

     public void close() throws IOException {

         super.close();

         Platform.exit();

     }

     String harnessResource() {

         return "org/apidesign/bck2brwsr/launcher/fximpl/harness.xhtml";

     }

     public static void main(String... args) throws IOException {

         String startPage = null;

         final ClassLoader cl = FXBrwsrLauncher.class.getClassLoader();

         startPage = findStartPage(cl, startPage);

         if (startPage == null) {

             throw new NullPointerException("Can't find StartPage tag in manifests!");

         }

         Launcher.showURL("fxbrwsr", cl, startPage);

     }

     private static String findStartPage(final ClassLoader cl, String startPage) throws IOException {

         Enumeration<URL> en = cl.getResources("META-INF/MANIFEST.MF");

         while (en.hasMoreElements()) {

             URL url = en.nextElement();

             Manifest mf;

             try (InputStream is = url.openStream()) {

                 mf = new Manifest(is);

             }

             String sp = mf.getMainAttributes().getValue("StartPage");

             if (sp != null) {

                 startPage = sp;

                 break;

             }

         }

         return startPage;

     }

 }