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package net.java.html.boot.fx;

import java.net.URL;

import javafx.beans.value.ChangeListener;

import javafx.beans.value.ObservableValue;

import javafx.concurrent.Worker;

import javafx.scene.web.WebView;

import net.java.html.boot.BrowserBuilder;

import net.java.html.js.JavaScriptBody;

import org.netbeans.html.boot.fx.AbstractFXPresenter;

/** Utility methods for working with <em>JavaFX</em> <code>WebView</code>s.

 *

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

 * @since 0.6

 */

public final class FXBrowsers {

    private FXBrowsers() {

    }

    /** Enables the Java/JavaScript bridge (that supports {@link JavaScriptBody} and co.)

     * in the provided <code>webView</code>. This method returns 

     * immediately. Once the support is active, it calls back specified

     * method in <code>onPageLoad</code> class - the class can possibly be

     * loaded by a different classloader (to enable replacement of

     * methods with {@link JavaScriptBody} annotations with executable

     * versions). The method <code>methodName</code> needs to be <code>public</code>

     * (in a public class), <code>static</code> and take either no parameters

     * or an array of {@link String}s.

     * 

     * @param webView the instance of Web View to tweak

     * @param url the URL of the HTML page to load into the view

     * @param onPageLoad callback class with method <code>methodName</code>

     * @param methodName the method to call when the page is loaded

     * @param args arguments to pass to the <code>methodName</code> method

     */

    public static void load(

        final WebView webView, final URL url, 

        Class<?> onPageLoad, String methodName,

        String... args

    ) {

        class Load extends AbstractFXPresenter {

            @Override

            protected void waitFinished() {

                // don't wait

            }

            @Override

            protected WebView findView(URL resource) {

                final Worker<Void> w = webView.getEngine().getLoadWorker();

                w.stateProperty().addListener(new ChangeListener<Worker.State>() {

                    @Override

                    public void changed(ObservableValue<? extends Worker.State> ov, Worker.State t, Worker.State newState) {

                        if (newState.equals(Worker.State.SUCCEEDED)) {

                            onPageLoad();

                        }

                        if (newState.equals(Worker.State.FAILED)) {

                            throw new IllegalStateException("Failed to load " + url);

                        }

                    }

                });

                return webView;

            }

        }

        BrowserBuilder.newBrowser(new Load()).

            loadPage(url.toExternalForm()).

            loadClass(onPageLoad).

            invoke(methodName, args).

            showAndWait();

    }

}