/**

 * 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.IOException;

import java.io.InputStream;

import java.net.URL;

import java.util.Enumeration;

import net.java.html.js.JavaScriptBody;

import net.java.html.js.JavaScriptResource;

/**

 *

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

 */

@JavaScriptResource("obj.js")

public class Resources {

    @JavaScriptBody(args = {}, body = "return obj;")

    static Object retObj() {

        return null;

    }

    public static boolean isObj() {

        return retObj() != null;

    }

    public static boolean isResource() {

        return Resources.class.getResource("obj.js") != null;

    }

    public static String loadKO() throws IOException {

        InputStream is = Resources.class.getResourceAsStream("ko.js");

        return readIS(is, false);

    }

    static String loadClazz() throws IOException {

        InputStream is = Resources.class.getResourceAsStream("Bck2BrwsrToolkit.class");

        return readIS(is, false);

    }

    private static String readIS(InputStream is, boolean asString) throws IOException {

        if (is == null) {

            return "No resource found!";

        }

        byte[] arr = new byte[4092];

        int len = is.read(arr);

        if (len < 5) {

            return "No data read! Len: " + len;

        }

        if (asString) {

            return new String(arr, 0, len, "UTF-8").toString().toString();

        }

        StringBuilder sb = new StringBuilder();

        sb.append("[");

        for (int i = 0; i < len; i++) {

            sb.append(arr[i]).append(", ");

        }

        return sb.toString().toString();

    }

    static long bytesToLong(byte b1, byte b2, int shift) {

        return (((long)b1 << 56) +

                ((long)b2 & 255) << 48) >> shift;

    }

    public static String loadHello() throws IOException {

        Enumeration<URL> en;

        try {

            en = Resources.class.getClassLoader().getResources("META-INF/ahoj");

        } catch (SecurityException ex) {

            return "SecurityException";

        }

        StringBuilder sb = new StringBuilder();

        while (en.hasMoreElements()) {

            URL url = en.nextElement();

            sb.append(readIS(url.openStream(), true));

        }

        return sb.toString().toString();

    }

    public static String loadJustHello() throws IOException {

        URL url = Resources.class.getResource("/META-INF/ahoj");

        StringBuilder sb = new StringBuilder();

        sb.append(readIS(url.openStream(), true));

        return sb.toString().toString();

    }

}