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package org.netbeans.html.boot.impl;

import java.io.Closeable;

import java.io.IOException;

import java.io.Reader;

import java.lang.reflect.Method;

import java.net.URL;

import java.util.Collection;

import java.util.Enumeration;

import net.java.html.js.JavaScriptBody;

import net.java.html.js.JavaScriptResource;

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

import static org.testng.Assert.assertEquals;

import org.testng.annotations.Test;

/**

 *

 * @author Jaroslav Tulach

 */

@JavaScriptResource("empty.js")

public class CountFnCreationTest implements Fn.Presenter {

    private int cnt;

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

    public static native void body();

    @Test public void countManyTimes() throws Exception {

        class Res implements FindResources {

            @Override

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

                try {

                    ClassLoader l = CountFnCreationTest.class.getClassLoader();

                    Enumeration<URL> en = l.getResources(path);

                    while (en.hasMoreElements()) {

                        results.add(en.nextElement());

                    }

                } catch (IOException ex) {

                    throw new IllegalStateException(ex);

                }

            }

        }

        ClassLoader l = FnUtils.newLoader(new Res(), this, CountFnCreationTest.class.getClassLoader().getParent());

        Method m = l.loadClass(CountFnCreationTest.class.getName()).getMethod("body");

        Closeable c = Fn.activate(this);

        try {

            assertEquals(cnt, 0, "No functions yet");

            m.invoke(null);

            assertEquals(cnt, 1, "One function defined");

            m.invoke(null);

            assertEquals(cnt, 1, "Still one function");

        } finally {

            c.close();

        }

    }

    @Override

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

        cnt++;

        return new MyFn(this);

    }

    @Override

    public void displayPage(URL page, Runnable onPageLoad) {

    }

    @Override

    public void loadScript(Reader code) throws Exception {

    }

    private static final class MyFn extends Fn {

        public MyFn(Presenter presenter) {

            super(presenter);

        }

        @Override

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

            return null;

        }

    }

}