/**

  * 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.fximpl;

 import java.lang.reflect.InvocationTargetException;

 import java.lang.reflect.Method;

 import java.net.URL;

 import java.net.URLClassLoader;

 import java.util.ArrayList;

 import java.util.Arrays;

 import java.util.Enumeration;

 import java.util.List;

 import javax.script.Invocable;

 import javax.script.ScriptEngine;

 import javax.script.ScriptEngineManager;

 import javax.script.ScriptException;

 import static org.testng.Assert.*;

 import org.testng.annotations.BeforeClass;

 import org.testng.annotations.Test;

 /**

  *

  * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

  */

 public class JsClassLoaderTest {

     private static ClassLoader loader;

     private static Class<?> methodClass;

     public JsClassLoaderTest() {

     }

     @BeforeClass

     public static void setUpClass() throws Exception {

         ScriptEngineManager sem = new ScriptEngineManager();

         final ScriptEngine eng = sem.getEngineByMimeType("text/javascript");

         final URL my = JsClassLoaderTest.class.getProtectionDomain().getCodeSource().getLocation();

         ClassLoader parent = JsClassLoaderTest.class.getClassLoader().getParent();

         final URLClassLoader ul = new URLClassLoader(new URL[] { my }, parent);

         loader = new JsClassLoader(parent) {

             @Override

             protected URL findResource(String name) {

                 return ul.getResource(name);

             }

             @Override

             protected Fn defineFn(String code, String... names) {

                 StringBuilder sb = new StringBuilder();

                 sb.append("(function() {");

                 sb.append("return function(");

                 String sep = "";

                 for (String n : names) {

                     sb.append(sep);

                     sb.append(n);

                     sep = ", ";

                 }

                 sb.append(") {");

                 sb.append(code);

                 sb.append("};");

                 sb.append("})()");

                 try {

                     final Object val = eng.eval(sb.toString());

                     return new Fn() {

                         @Override

                         public Object invoke(Object thiz, Object... args) throws Exception {

                             List<Object> all = new ArrayList<Object>(args.length + 1);

                             all.add(thiz == null ? val : thiz);

                             all.addAll(Arrays.asList(args));

                             Invocable inv = (Invocable)eng;

                             Object ret = inv.invokeMethod(val, "call", all.toArray());

                             return ret == val ? null : ret;

                         }

                     };

                 } catch (ScriptException ex) {

                     throw new LinkageError("Can't parse: " + sb, ex);

                 }

             }

             @Override

             protected Enumeration<URL> findResources(String name) {

                 throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

             }

         };

         methodClass = loader.loadClass(JsMethods.class.getName());

     }

     @Test public void noParamMethod() throws Throwable {

         Method plus = methodClass.getMethod("fortyTwo");

         try {

             final Object val = plus.invoke(null);

             assertTrue(val instanceof Number, "A number returned " + val);

             assertEquals(((Number)val).intValue(), 42);

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

     @Test public void testExecuteScript() throws Throwable {

         Method plus = methodClass.getMethod("plus", int.class, int.class);

         try {

             assertEquals(plus.invoke(null, 10, 20), 30);

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

     @Test public void overloadedMethod() throws Throwable {

         Method plus = methodClass.getMethod("plus", int.class);

         try {

             assertEquals(plus.invoke(null, 10), 10);

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

     @Test public void instanceMethod() throws Throwable {

         Method plus = methodClass.getMethod("plusInst", int.class);

         Object inst = methodClass.newInstance();

         try {

             assertEquals(plus.invoke(inst, 10), 10);

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

     @Test public void staticThis() throws Throwable {

         Method st = methodClass.getMethod("staticThis");

         try {

             assertNull(st.invoke(null));

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

     @Test public void getThis() throws Throwable {

         Object th = methodClass.newInstance();

         Method st = methodClass.getMethod("getThis");

         try {

             assertEquals(st.invoke(th), th);

         } catch (InvocationTargetException ex) {

             throw ex.getTargetException();

         }

     }

 }