/**

  * 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 java.io.File;

 import java.io.FileWriter;

 import java.io.IOException;

 import java.io.InputStream;

 import static org.testng.Assert.*;

 import javax.script.Invocable;

 import org.testng.annotations.BeforeClass;

 import org.testng.annotations.Test;

 /**

  *

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

  */

 public class VMinVMTest {

     private static CharSequence codeSeq;

     private static Invocable code;

     @Test public void compareGeneratedCodeForArrayClass() throws Exception {

         compareCode("/org/apidesign/vm4brwsr/Array.class");

     }

     @Test public void compareGeneratedCodeForClassesClass() throws Exception {

         compareCode("/org/apidesign/vm4brwsr/Classes.class");

     }

     @BeforeClass

     public void compileTheCode() throws Exception {

         StringBuilder sb = new StringBuilder();

         code = StaticMethodTest.compileClass(sb, 

             "org/apidesign/vm4brwsr/VMinVM"

         );

         codeSeq = sb;

     }

     private static byte[] readClass(String res) throws IOException {

         InputStream is1 = VMinVMTest.class.getResourceAsStream(res);

         assertNotNull(is1, "Stream found");

         byte[] arr = new byte[is1.available()];

         int len = is1.read(arr);

         is1.close();

         if (len != arr.length) {

             throw new IOException("Wrong len " + len + " for arr: " + arr.length);

         }

         return arr;

     }

     private void compareCode(final String nm) throws Exception, IOException {

         byte[] arr = readClass(nm);

         String ret1 = VMinVM.toJavaScript(arr);

         Object ret;

         try {

             ret = code.invokeFunction("bck2brwsr");

             ret = code.invokeMethod(ret, "loadClass", VMinVM.class.getName());

             ret = code.invokeMethod(ret, "toJavaScript__Ljava_lang_String_2_3B", arr);

         } catch (Exception ex) {

             File f = File.createTempFile("execution", ".js");

             FileWriter w = new FileWriter(f);

             w.append("var byteCode = [\n  ");

             String sep = "";

             for (int i = 0; i < arr.length; i++) {

                 w.append(sep).append(Integer.toString((arr[i] + 256) % 256));

                 sep = ", ";

                 if (i % 20 == 0) {

                     w.append("\n  ");

                 }

             }

             w.append("\n];\n");

             w.append(codeSeq);

             w.close();

             throw new Exception(ex.getMessage() + " file: " + f, ex);

         }

         assertTrue(ret instanceof String, "It is string: " + ret);

         if (!ret1.toString().equals(ret)) {

             StringBuilder msg = new StringBuilder("Difference found between ");

             msg.append(StaticMethodTest.dumpJS(ret1));

             msg.append(" ");

             msg.append(StaticMethodTest.dumpJS((CharSequence) ret));

             msg.append(" compiled by ");

             msg.append(StaticMethodTest.dumpJS(codeSeq));

             fail(msg.toString());

         }

     }

 }