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package org.netbeans.html.boot.impl;

import java.io.Closeable;

import java.io.Flushable;

import java.io.IOException;

import java.io.Reader;

import java.net.URL;

import java.net.URLClassLoader;

import java.util.ArrayList;

import java.util.Arrays;

import java.util.Collection;

import java.util.List;

import javax.script.Invocable;

import javax.script.ScriptEngine;

import javax.script.ScriptEngineManager;

import javax.script.ScriptException;

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

import static org.testng.Assert.assertEquals;

import org.testng.annotations.BeforeClass;

import org.testng.annotations.BeforeMethod;

import org.testng.annotations.Test;

/**

 *

 * @author Jaroslav Tulach

 */

public class FnTest extends JsClassLoaderBase {

    private static Fn.Presenter presenter;

    public FnTest() {

    }

    @BeforeClass

    public static void createClassLoader() throws Exception {

        ScriptEngineManager sem = new ScriptEngineManager();

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

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

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

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

        class Impl implements FindResources, Fn.Presenter {

            @Override

            public void findResources(String path, Collection<? super URL> results, boolean oneIsEnough) {

                URL u = ul.findResource(path);

                if (u != null) {

                    results.add(u);

                }

            }

            @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 (ScriptException ex) {

                                throw ex;

                            }

                        }

                    };

                } catch (ScriptException ex) {

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

                }

            }

            @Override

            public void displayPage(URL resource, Runnable r) {

                throw new UnsupportedOperationException();

            }

            @Override

            public void loadScript(Reader code) throws Exception {

                eng.eval(code);

            }

        }

        Impl impl = new Impl();

        ClassLoader loader = FnUtils.newLoader(impl, impl, parent);

        presenter = impl;

        Closeable close = FnContext.activate(impl);

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

        close.close();

    }

    @Test public void flushingPresenter() throws IOException {

        class FP implements Fn.Presenter, Flushable {

            int flush;

            @Override

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

                throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

            }

            @Override

            public void displayPage(URL page, Runnable onPageLoad) {

                throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

            }

            @Override

            public void loadScript(Reader code) throws Exception {

                throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.

            }

            @Override

            public void flush() throws IOException {

                flush++;

            }

        }

        FP p = new FP();

        Closeable c1 = Fn.activate(p);

        Closeable c2 = Fn.activate(p);

        c2.close();

        assertEquals(p.flush, 0, "No flush yet");

        c1.close();

        assertEquals(p.flush, 1, "Now flushed");

    }

    @BeforeMethod public void initPresenter() {

        FnContext.currentPresenter(presenter);

    }

}