/**

 * HTML via Java(tm) Language Bindings

 * Copyright (C) 2013 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. apidesign.org

 * designates this particular file as subject to the

 * "Classpath" exception as provided by apidesign.org

 * in the License file that accompanied this code.

 *

 * 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://wiki.apidesign.org/wiki/GPLwithClassPathException

 */

package org.apidesign.html.boot.impl;

import java.io.Closeable;

import java.io.Reader;

import org.apidesign.html.boot.spi.Fn;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Enumeration;

import java.util.List;

import javax.script.Invocable;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

import org.testng.annotations.AfterClass;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.BeforeMethod;

/**

 *

 * @author Jaroslav Tulach <jaroslav.tulach@apidesign.org>

 */

public class JsClassLoaderTest extends JsClassLoaderBase{

    private static Fn.Presenter loader;

    @BeforeClass

    public static void setUpClass() throws Exception {

        ScriptEngineManager sem = new ScriptEngineManager();

        final ScriptEngine eng = sem.getEngineByMimeType("text/javascript");

        final URL my = JsClassLoaderTest.class.getProtectionDomain().getCodeSource().getLocation();

        ClassLoader parent = JsClassLoaderTest.class.getClassLoader().getParent();

        final URLClassLoader ul = new URLClassLoader(new URL[] { my }, parent);

        class MyCL extends JsClassLoader implements Fn.Presenter {

            public MyCL(ClassLoader parent) {

                super(parent);

            }

            @Override

            protected URL findResource(String name) {

                return ul.getResource(name);

            }

            @Override

            public Fn defineFn(String code, String... names) {

                StringBuilder sb = new StringBuilder();

                sb.append("(function() {");

                sb.append("return function(");

                String sep = "";

                for (String n : names) {

                    sb.append(sep);

                    sb.append(n);

                    sep = ", ";

                }

                sb.append(") {");

                sb.append(code);

                sb.append("};");

                sb.append("})()");

                try {

                    final Object val = eng.eval(sb.toString());

                    return new Fn(this) {

                        @Override

                        public Object invoke(Object thiz, Object... args) throws Exception {

                            List<Object> all = new ArrayList<Object>(args.length + 1);

                            all.add(thiz == null ? val : thiz);

                            all.addAll(Arrays.asList(args));

                            Invocable inv = (Invocable)eng;

                            try {

                                Object ret = inv.invokeMethod(val, "call", all.toArray());

                                return val.equals(ret) ? null : ret;

                            } catch (Exception ex) {

                                throw ex;

                            }

                        }

                    };

                } catch (ScriptException ex) {

                    throw new LinkageError("Can't parse: " + sb, ex);

                }

            }

            @Override

            protected Enumeration<URL> findResources(String name) {

                throw new UnsupportedOperationException();

            }

            @Override

            public void loadScript(Reader code) throws ScriptException {

                eng.eval(code);

            }

            @Override

            public void displayPage(URL page, Runnable onPageLoad) {

                throw new UnsupportedOperationException();

            }

        };

        MyCL l = new MyCL(parent);

        Closeable close = FnContext.activate(l);

        methodClass = l.loadClass(JsMethods.class.getName());

        close.close();

        loader = l;

    }

    @BeforeMethod public void initPresenter() {

        FnContext.currentPresenter(loader);

    }

    @AfterClass

    public static void cleanUp() {

        methodClass = null;

    }

}