/*

 Java 4 Browser Bytecode Translator

 Copyright (C) 2012-2012 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 org.apidesign.vm4brwsr.ByteCodeToJavaScript;

 import java.io.IOException;

 import java.io.InputStream;

 import java.util.Arrays;

 import java.util.HashSet;

 import java.util.Iterator;

 import java.util.LinkedList;

 import java.util.Set;

 import java.util.TreeSet;

 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.Test;

 /** Checks the basic behavior of the translator.

  *

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

  */

 public class StaticMethodTest {

     @Test public void threePlusFour() throws Exception {

         assertExec(

             "Should be seven", 

             "org_apidesign_vm4brwsr_StaticMethod_sumIII", 

             Double.valueOf(7), 

             3, 4

         );

     }

     @Test public void powerOfThree() throws Exception {

         assertExec(

             "Should be nine", 

             "org_apidesign_vm4brwsr_StaticMethod_powerFF", 

             Double.valueOf(9),

             3.0f

         );

     }

     @Test public void doubleWithoutLong() throws Exception {

         assertExec(

             "Should be two",

             "org_apidesign_vm4brwsr_StaticMethod_minusDDJ", 

             Double.valueOf(2),

             3.0d, 1l

         );

     }

     @Test public void divAndRound() throws Exception {

         assertExec(

             "Should be rounded to one",

             "org_apidesign_vm4brwsr_StaticMethod_divIBD", 

             Double.valueOf(1),

             3, 3.75

         );

     }

     @Test public void mixedMethodFourParams() throws Exception {

         assertExec(

             "Should be two",

             "org_apidesign_vm4brwsr_StaticMethod_mixIIJBD", 

             Double.valueOf(20),

             2, 10l, 5, 2.0

         );

     }

     @Test public void factRec() throws Exception {

         assertExec(

             "Factorial of 5 is 120",

             "org_apidesign_vm4brwsr_StaticMethod_factRecJI", 

             Double.valueOf(120),

             5

         );

     }

     @Test public void factIter() throws Exception {

         assertExec(

             "Factorial of 5 is 120",

             "org_apidesign_vm4brwsr_StaticMethod_factIterJI", 

             Double.valueOf(120),

             5

         );

     }

     @Test public void xor() throws Exception {

         assertExec(

             "Xor is 4",

             "org_apidesign_vm4brwsr_StaticMethod_xorJIJ",

             Double.valueOf(4),

             7,

             3

         );

     }

     @Test public void or() throws Exception {

         assertExec(

             "Or will be 7",

             "org_apidesign_vm4brwsr_StaticMethod_orOrAndJZII",

             Double.valueOf(7),

             true,

             4,

             3

         );

     }

     @Test public void and() throws Exception {

         assertExec(

             "And will be 3",

             "org_apidesign_vm4brwsr_StaticMethod_orOrAndJZII",

             Double.valueOf(3),

             false,

             7,

             3

         );

     }

     @Test public void inc4() throws Exception {

         assertExec(

             "It will be 4",

             "org_apidesign_vm4brwsr_StaticMethod_inc4I",

             Double.valueOf(4)

         );

     }

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

         StringBuilder sb = new StringBuilder();

         Invocable i = compileClass(sb, "org/apidesign/vm4brwsr/StaticMethod");

         Object ret = null;

         try {

             ret = i.invokeFunction(methodName, args);

         } catch (ScriptException ex) {

             fail("Execution failed in " + sb, ex);

         } catch (NoSuchMethodException ex) {

             fail("Cannot find method in " + sb, ex);

         }

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

             return;

         }

         if (expRes.equals(ret)) {

             return;

         }

         assertEquals(ret, expRes, msg + "was: " + ret + "\n" + sb);

     }

     static Invocable compileClass(StringBuilder sb, String... names) throws ScriptException, IOException {

         if (sb == null) {

             sb = new StringBuilder();

         }

         Set<String> processed = new HashSet<String>();

         LinkedList<String> toProcess = new LinkedList<String>(Arrays.asList(names));

         for (;;) {

             toProcess.removeAll(processed);

             if (toProcess.isEmpty()) {

                 break;

             }

             String name = toProcess.getFirst();

             processed.add(name);

             if (name.startsWith("java/") && !name.equals("java/lang/Object")) {

                 continue;

             }

             InputStream is = StaticMethodTest.class.getClassLoader().getResourceAsStream(name + ".class");

             assertNotNull(is, "Class file found");

             try {

                 ByteCodeToJavaScript.compile(is, sb, toProcess);

             } catch (RuntimeException ex) {

                 int lastBlock = sb.lastIndexOf("{");

                 throw new IllegalStateException(

                     "Error while compiling " + name + "\n" + 

                     sb.substring(0, sb.length()), 

                     ex

                 );

             }

         }

         ScriptEngineManager sem = new ScriptEngineManager();

         ScriptEngine js = sem.getEngineByExtension("js");

         try {

             Object res = js.eval(sb.toString());

             assertTrue(js instanceof Invocable, "It is invocable object: " + res);

             return (Invocable)js;

         } catch (ScriptException ex) {

             fail("Could not compile:\n" + sb, ex);

             return null;

         }

     }

 }