/**

  * 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 java.net.URL;

 import java.util.Enumeration;

 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;

 /** 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", 

             StaticMethod.class, "sum__III", 

             Double.valueOf(7), 

             3, 4

         );

     }

     @Test public void checkReallyInitializedValues() throws Exception {

         assertExec(

             "Return true", 

             StaticMethod.class, "isNull__Z", 

             Double.valueOf(1)

         );

     }

     @Test public void powerOfThree() throws Exception {

         assertExec(

             "Should be nine", 

             StaticMethod.class, "power__FF", 

             Double.valueOf(9),

             3.0f

         );

     }

     @Test public void minusOne() throws Exception {

         assertExec(

             "Should be minus one", 

             StaticMethod.class, "minusOne__I", 

             Double.valueOf(-1)

         );

     }

     @Test public void doubleWithoutLong() throws Exception {

         assertExec(

             "Should be two",

             StaticMethod.class, "minus__DDJ", 

             Double.valueOf(2),

             3.0d, 1l

         );

     }

     @Test public void divAndRound() throws Exception {

         assertExec(

             "Should be rounded to one",

             StaticMethod.class, "div__IBD", 

             Double.valueOf(1),

             3, 3.75

         );

     }

     @Test public void mixedMethodFourParams() throws Exception {

         assertExec(

             "Should be two",

             StaticMethod.class, "mix__IIJBD", 

             Double.valueOf(20),

             2, 10l, 5, 2.0

         );

     }

     @Test public void factRec() throws Exception {

         assertExec(

             "Factorial of 5 is 120",

             StaticMethod.class, "factRec__JI", 

             Double.valueOf(120),

             5

         );

     }

     @Test public void factIter() throws Exception {

         assertExec(

             "Factorial of 5 is 120",

             StaticMethod.class, "factIter__JI", 

             Double.valueOf(120),

             5

         );

     }

     @Test public void xor() throws Exception {

         assertExec(

             "Xor is 4",

             StaticMethod.class, "xor__JIJ",

             Double.valueOf(4),

             7,

             3

         );

     }

     @Test public void or() throws Exception {

         assertExec(

             "Or will be 7",

             StaticMethod.class, "orOrAnd__JZII",

             Double.valueOf(7),

             true,

             4,

             3

         );

     }

     @Test public void nullCheck() throws Exception {

         assertExec(

             "Returns nothing",

             StaticMethod.class, "none__oII",

             null, 1, 3

         );

     }

     @Test public void and() throws Exception {

         assertExec(

             "And will be 3",

             StaticMethod.class, "orOrAnd__JZII",

             Double.valueOf(3),

             false,

             7,

             3

         );

     }

     @Test public void inc4() throws Exception {

         assertExec(

             "It will be 4",

             StaticMethod.class, "inc4__I",

             Double.valueOf(4)

         );

     }

     @Test public void shiftLeftInJava() throws Exception {

         int res = StaticMethod.shiftLeft(1, 8);

         assertEquals(res, 256);

     }

     @Test public void shiftLeftInJS() throws Exception {

         assertExec(

             "Setting 9th bit",

             StaticMethod.class, "shiftLeft__III",

             Double.valueOf(256),

             1, 8

         );

     }

     @Test public void shiftRightInJava() throws Exception {

         int res = StaticMethod.shiftArithmRight(-8, 3, true);

         assertEquals(res, -1);

     }

     @Test public void shiftRightInJS() throws Exception {

         assertExec(

             "Get -1",

             StaticMethod.class, "shiftArithmRight__IIIZ",

             Double.valueOf(-1),

             -8, 3, true

         );

     }

     @Test public void unsignedShiftRightInJava() throws Exception {

         int res = StaticMethod.shiftArithmRight(8, 3, false);

         assertEquals(res, 1);

     }

     @Test public void unsignedShiftRightInJS() throws Exception {

         assertExec(

             "Get -1",

             StaticMethod.class, "shiftArithmRight__IIIZ",

             Double.valueOf(1),

             8, 3, false

         );

     }

     @Test public void javaScriptBody() throws Exception {

         assertExec(

             "JavaScript string",

             StaticMethod.class, "i2s__sII",

             "333",

             330, 3

         );

     }

     @Test public void switchJarda() throws Exception {

         assertExec(

             "The expected value",

             StaticMethod.class, "swtch__sI",

             "Jarda",

             0

         );

     }

     @Test public void switchDarda() throws Exception {

         assertExec(

             "The expected value",

             StaticMethod.class, "swtch__sI",

             "Darda",

             1

         );

     }

     @Test public void switchParda() throws Exception {

         assertExec(

             "The expected value",

             StaticMethod.class, "swtch2__sI",

             "Parda",

             22

         );

     }

     @Test public void switchMarda() throws Exception {

         assertExec(

             "The expected value",

             StaticMethod.class, "swtch__sI",

             "Marda",

             -433

         );

     }

     @Test public void checkNullCast() throws Exception {

         assertExec("Null can be cast to any type",

             StaticMethod.class, "castNull__sZ", 

             null, true

         );

     }

     private static CharSequence codeSeq;

     private static Invocable code;

     @BeforeClass 

     public void compileTheCode() throws Exception {

         StringBuilder sb = new StringBuilder();

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

         codeSeq = sb;

     }

     private static void assertExec(

         String msg, Class clazz, String method, 

         Object expRes, Object... args

     ) throws Exception {

         assertExec(code, codeSeq, msg, clazz, method, expRes, args);

     }

     static void assertExec(

         Invocable toRun, CharSequence theCode,

         String msg, Class clazz, String method, 

         Object expRes, Object... args

     ) throws Exception {

         Object ret = null;

         try {

             ret = toRun.invokeFunction("bck2brwsr");

             ret = toRun.invokeMethod(ret, "loadClass", clazz.getName());

             ret = toRun.invokeMethod(ret, method, args);

         } catch (ScriptException ex) {

             fail("Execution failed in\n" + dumpJS(theCode), ex);

         } catch (NoSuchMethodException ex) {

             fail("Cannot find method in\n" + dumpJS(theCode), ex);

         }

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

             return;

         }

         if (expRes != null && expRes.equals(ret)) {

             return;

         }

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

     }

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

         return compileClass(sb, null, names);

     }

     static Invocable compileClass(

         StringBuilder sb, ScriptEngine[] eng, String... names

     ) throws ScriptException, IOException {

         if (sb == null) {

             sb = new StringBuilder();

         }

         Bck2Brwsr.generate(sb, new EmulationResources(), names);

         ScriptEngineManager sem = new ScriptEngineManager();

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

         if (eng != null) {

             eng[0] = js;

         }

         try {

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

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

             return (Invocable)js;

         } catch (Exception ex) {

             if (sb.length() > 2000) {

                 sb = dumpJS(sb);

             }

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

             return null;

         }

     }

     static StringBuilder dumpJS(CharSequence sb) throws IOException {

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

         FileWriter w = new FileWriter(f);

         w.append(sb);

         w.close();

         return new StringBuilder(f.getPath());

     }

     private static class EmulationResources implements Bck2Brwsr.Resources {

         @Override

         public InputStream get(String name) throws IOException {

             Enumeration<URL> en = StaticMethodTest.class.getClassLoader().getResources(name);

             URL u = null;

             while (en.hasMoreElements()) {

                 u = en.nextElement();

             }

             if (u == null) {

                 throw new IOException("Can't find " + name);

             }

             if (u.toExternalForm().contains("rt.jar!")) {

                 throw new IOException("No emulation for " + u);

             }

             return u.openStream();

         }

     }

 }