/**

  * 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 javax.script.ScriptContext;

 import javax.script.ScriptEngine;

 import javax.script.ScriptException;

 import org.testng.annotations.BeforeClass;

 import static org.testng.Assert.*;

 import org.testng.annotations.AfterClass;

 import org.testng.annotations.Test;

 /** Implements loading class by class.

  *

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

  */

 public class VMLazyTest {

     private static TestVM code;

     @BeforeClass

     public static void compileTheCode() throws Exception {

         StringBuilder sb = new StringBuilder();

         sb.append("\nvar data = {};");

         sb.append("\nfunction test(clazz, method) {");

         sb.append("\n  if (!data.bck2brwsr) data.bck2brwsr = bck2brwsr(function(name) { return loader.get(name); });");

         sb.append("\n  var c = data.bck2brwsr.loadClass(clazz);");

         sb.append("\n  return c[method]();");

         sb.append("\n}");

         sb.append("\nfunction checkKO() {");

         sb.append("\n  return ko !== null;");

         sb.append("\n}");

         ScriptEngine[] arr = { null };

         code = TestVM.compileClass(sb, arr,

             new String[]{"org/apidesign/vm4brwsr/VM", "org/apidesign/vm4brwsr/StaticMethod"}

         );

         arr[0].getContext().setAttribute("loader", new BytesLoader(), ScriptContext.ENGINE_SCOPE);

     }

     @AfterClass

     public static void releaseTheCode() {

         code = null;

     }

     @Test public void invokeStaticMethod() throws Exception {

         assertExec("Trying to get -1", "test", Double.valueOf(-1),

             StaticMethod.class.getName(), "minusOne__I"

         );

     }

     @Test public void loadDependantClass() throws Exception {

         assertExec("Expecting zero", "test", Double.valueOf(0),

             InstanceSub.class.getName(), "recallDbl__D"

         );

     }

     @Test public void loadClassWithAssociatedScript() throws Exception {

         assertExec("ko is defined", "test", true,

             Script.class.getName(), "checkNotNull__Z"

         );

         Object res = code.invokeFunction("checkKO");

         assertEquals(res, true, "KO is defined on a global level");

     }

     private static void assertExec(String msg, String methodName, Object expRes, Object... args) throws Exception {

         Object ret = null;

         try {

             ret = code.invokeFunction(methodName, args);

         } catch (ScriptException ex) {

             fail("Execution failed in\n" + code.toString(), ex);

         } catch (NoSuchMethodException ex) {

             fail("Cannot find method in\n" + code.toString(), ex);

         }

         if (ret == null && expRes == null) {

             return;

         }

         if (expRes instanceof Double && ret instanceof Number) {

             ret = ((Number)ret).doubleValue();

         }

         if (expRes.equals(ret)) {

             return;

         }

         assertEquals(ret, expRes, msg + "was: " + ret + "\n" + code.toString());

     }

 }