/**

  * 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.vm4brwsr;

 import com.google.javascript.jscomp.CommandLineRunner;

 import com.google.javascript.jscomp.SourceFile;

 import java.io.IOException;

 import java.io.OutputStream;

 import java.io.PrintStream;

 import java.util.Collections;

 import java.util.List;

 import org.apidesign.bck2brwsr.core.ExtraJavaScript;

 /**

  *

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

  */

 @ExtraJavaScript(processByteCode = false, resource="")

 final class ClosureWrapper extends CommandLineRunner implements SourceFile.Generator {

     private static final String[] ARGS = { "--compilation_level", "SIMPLE_OPTIMIZATIONS", "--js", "bck2brwsr-raw.js" };

     private String code;

     private final Bck2Brwsr.Resources res;

     private final StringArray classes;

     private ClosureWrapper(Appendable out, ObfuscationLevel obfuscationLevel,

                            Bck2Brwsr.Resources res, StringArray classes) {

         super(

             generateArguments(obfuscationLevel),

             new PrintStream(new APS(out)), System.err

         );

         this.res = res;

         this.classes = classes;

     }

     @Override

     protected List<SourceFile> createInputs(List<String> files, boolean allowStdIn) throws FlagUsageException, IOException {

         if (files.size() != 1 || !"bck2brwsr-raw.js".equals(files.get(0))) {

             throw new IOException("Unexpected files: " + files);

         }

         return Collections.nCopies(1, SourceFile.fromGenerator("bck2brwsr-raw.js", this));

     }

     @Override

     public String getCode() {

         if (code == null) {

             StringBuilder sb = new StringBuilder();

             try {

                 VM.compile(res, sb, classes);

             } catch (IOException ex) {

                 code = ex.getMessage();

             }

             code = sb.toString();

         }

         return code;

     }

     private static final class APS extends OutputStream {

         private final Appendable out;

         public APS(Appendable out) {

             this.out = out;

         }

         @Override

         public void write(int b) throws IOException {

             out.append((char)b);

         }

     }

     private static String[] generateArguments(

             ObfuscationLevel obfuscationLevel) {

         String[] finalArgs = ARGS.clone();

         finalArgs[1] = obfuscationLevel.toString();

         return finalArgs;

     }

     static int produceTo(Appendable w, ObfuscationLevel obfuscationLevel, Bck2Brwsr.Resources resources, StringArray arr) throws IOException {

         ClosureWrapper cw = new ClosureWrapper(w, obfuscationLevel, resources,

                                                arr);

         try {

             return cw.doRun();

         } catch (FlagUsageException ex) {

             throw new IOException(ex);

         }

     }

 }