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package org.netbeans.html.boot.fx;

import java.util.concurrent.CountDownLatch;

import java.util.concurrent.Executors;

import javafx.application.Platform;

import net.java.html.BrwsrCtx;

import net.java.html.boot.BrowserBuilder;

import net.java.html.js.JavaScriptBody;

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

import static org.testng.Assert.*;

import org.testng.annotations.Test;

/**

 *

 * @author Jaroslav Tulach

 */

public class ReloadTest {

    private static Runnable whenInitialized;

    public ReloadTest() {

    }

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

    private static native int plus(int a, int b);

    @Test public void checkReload() throws Throwable {

        final Throwable[] arr = { null };

        final BrowserBuilder bb = BrowserBuilder.newBrowser().loadClass(ReloadTest.class).

                loadPage("empty.html").

                invoke("initialized");

        class ShowBrowser implements Runnable {

            @Override

            public void run() {

                bb.showAndWait();

            }

        }

        class WhenInitialized implements Runnable {

            CountDownLatch cdl = new CountDownLatch(1);

            AbstractFXPresenter p;

            BrwsrCtx ctx;

            @Override

            public void run() {

                try {

                    whenInitialized = null;

                    doCheckReload();

                    p = (AbstractFXPresenter) Fn.activePresenter();

                    assertNotNull(p, "Presenter is defined");

                    ctx = BrwsrCtx.findDefault(WhenInitialized.class);

                } catch (Throwable ex) {

                    arr[0] = ex;

                } finally {

                    cdl.countDown();

                }

            }

        }

        WhenInitialized when = new WhenInitialized();

        whenInitialized = when;

        Executors.newSingleThreadExecutor().submit(new ShowBrowser());

        when.cdl.await();

        if (arr[0] != null) throw arr[0];

        class ReloadPage implements Runnable {

            final CountDownLatch cdl = new CountDownLatch(1);

            private final AbstractFXPresenter p;

            public ReloadPage(AbstractFXPresenter p) {

                this.p = p;

            }

            @Override

            public void run() {

                p.engine.reload();

                cdl.countDown();

            }

        }

        ReloadPage relPage = new ReloadPage(when.p);

        class SecondInit implements Runnable {

            CountDownLatch cdl = new CountDownLatch(1);

            @Override

            public void run() {

                try {

                    whenInitialized = null;

                    doCheckReload();

                } catch (Throwable ex) {

                    arr[0] = ex;

                } finally {

                    cdl.countDown();

                }

            }

        }

        SecondInit second = new SecondInit();

        whenInitialized = second;

        Platform.runLater(relPage);

        second.cdl.await();

        if (arr[0] != null) throw arr[0];

    }

    final void doCheckReload() throws Exception {

        int res = plus(30, 12);

        assertEquals(res, 42, "Meaning of world computed");

    }

    public static synchronized void initialized() throws Exception {

        whenInitialized.run();

    }

}