/**

 * 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());

        }

    }

}