/**

 * 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;

import java.io.InputStream;

import java.lang.reflect.InvocationTargetException;

import java.lang.reflect.Method;

import java.net.URL;

import org.apidesign.bck2brwsr.core.JavaScriptBody;

/**

 *

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

 */

public class Console {

    public static String welcome() {

        final String msg = "Hello from Bck2Brwsr!";

        alert(msg);

        return msg;

    }

    @JavaScriptBody(args = "msg", body = "alert(msg);")

    private static native void alert(String msg);

    @JavaScriptBody(args = {"id", "attr"}, body = 

        "return window.document.getElementById(id)[attr].toString();")

    private static native Object getAttr(String id, String attr);

    @JavaScriptBody(args = {"id", "attr", "value"}, body = 

        "window.document.getElementById(id)[attr] = value;")

    private static native void setAttr(String id, String attr, Object value);

    public static void execute() throws Exception {

        String clazz = (String) getAttr("clazz", "value");

        String method = (String) getAttr("method", "value");

        Object res = invokeMethod(clazz, method);

        setAttr("result", "value", res);

    }

    public static void harness() {

        try {

            URL u = new URL("/execute/data");

            String data = (String) u.getContent(new Class[] { String.class });

            setAttr("result", "value", data);

        } catch (Exception ex) {

            setAttr("result", "value", ex.getMessage());

        }

    }

    private static Object invokeMethod(String clazz, String method) 

    throws ClassNotFoundException, InvocationTargetException, 

    SecurityException, IllegalAccessException, IllegalArgumentException {

        Method found = null;

        Class<?> c = Class.forName(clazz);

        for (Method m : c.getMethods()) {

            if (m.getName().equals(method)) {

                found = m;

            }

        }

        Object res;

        if (found != null) {

            res = found.invoke(null);

        } else {

            res = "Can't find method " + method + " in " + clazz;

        }

        return res;

    }

}