/**

  * Back 2 Browser Bytecode Translator

  * Copyright (C) 2012-2015 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 java.io.File;

 import java.io.FileNotFoundException;

 import java.io.IOException;

 import java.io.InputStream;

 import java.io.StringWriter;

 import java.net.JarURLConnection;

 import java.net.URISyntaxException;

 import java.net.URL;

 import java.net.URLConnection;

 import java.util.Set;

 import java.util.logging.Logger;

 import org.apidesign.bck2brwsr.aot.Bck2BrwsrJars;

 import org.apidesign.bck2brwsr.launcher.BaseHTTPLauncher.Res;

 import org.apidesign.vm4brwsr.Bck2Brwsr;

 /**

  *

  * @author Jaroslav Tulach

  */

 class CompileCP {

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

     static String compileJAR(final File jar, Set<String> testClasses) 

     throws IOException {

         StringWriter w = new StringWriter();

         try {

             Bck2BrwsrJars.configureFrom(null, jar)

                 .addExported(testClasses.toArray(new String[0]))

                 .generate(w);

             w.flush();

             return w.toString();

         } catch (IOException ex) {

             throw ex;

         } catch (Throwable ex) {

             throw new IOException("Cannot compile: ", ex);

         } finally {

             w.close();

         }

     }

     static String compileFromClassPath(URL u, final Res r) throws IOException {

         File f;

         try {

             f = new File(u.toURI());

         } catch (URISyntaxException ex) {

             throw new IOException(ex);

         }

         String s = f.isDirectory() ? f.getPath() : null;

         for (String candidate : System.getProperty("java.class.path").split(File.pathSeparator)) {

             if (s != null) {

                 break;

             }

             if (f.getPath().startsWith(candidate)) {

                 s = candidate;

             }

         }

         if (s != null) {

             File root = new File(s);

             StringWriter w = new StringWriter();

             try {

                 Bck2BrwsrJars.configureFrom(null, root)

                     .generate(w);

                 w.flush();

                 return w.toString();

             } catch (ClassFormatError ex) {

                 throw new IOException(ex);

             } finally {

                 w.close();

             }

         }

         return null;

     }

     static void compileVM(StringBuilder sb, final Res r) throws IOException {

         final Bck2Brwsr rt;

         try {

             URL u = r.get(InterruptedException.class.getName().replace('.', '/') + ".class", 0);

             if (u == null) {

                 throw new IOException("Cannot find InterruptedException class on classpath: " + System.getProperty("java.class.path"));

             }

             rt = configureFrom(u, null, 3);

         } catch (URISyntaxException ex) {

             throw new IOException(ex);

         }

         final Bck2Brwsr all;

         try {

             URL u = r.get(Bck2Brwsr.class.getName().replace('.', '/') + ".class", 0);

             all = configureFrom(u, rt, 4);

         } catch (URISyntaxException ex) {

             throw new IOException(ex);

         }

         all

             .standalone(true)

             //.obfuscation(ObfuscationLevel.FULL)

             .resources(new Bck2Brwsr.Resources() {

                 @Override

                 public InputStream get(String resource) throws IOException {

                     final URL url = r.get(resource, 0);

                     return url == null ? null : url.openStream();

                 }

             }).generate(sb);

     }

     static Bck2Brwsr configureFrom(URL u, Bck2Brwsr rt, int parents) throws IOException, URISyntaxException {

         final URLConnection conn = u.openConnection();

         if (conn instanceof JarURLConnection) {

             JarURLConnection juc = (JarURLConnection)conn;

             rt = Bck2BrwsrJars.configureFrom(null, new File(juc.getJarFileURL().toURI()));

         } else if (u.getProtocol().equals("file")) {

             File dir = new File(u.toURI());

             while (parents-- > 0) {

                 dir = dir.getParentFile();

             }

             rt = Bck2BrwsrJars.configureFrom(null, dir);

         } else {

             throw new FileNotFoundException("Not a JAR or file URL: " + u);

         }

         return rt;

     }

 }