/**

 * Back 2 Browser Bytecode Translator

 * Copyright (C) 2012 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.

 *

 * 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://opensource.org/licenses/GPL-2.0.

 */

package org.apidesign.bck2brwsr.launcher.impl;

import java.util.List;

import java.util.TooManyListenersException;

import java.util.logging.Level;

import java.util.logging.Logger;

import javafx.application.Application;

import javafx.application.Platform;

import javafx.beans.value.ChangeListener;

import javafx.beans.value.ObservableValue;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.geometry.HPos;

import javafx.geometry.Insets;

import javafx.geometry.Pos;

import javafx.geometry.VPos;

import javafx.scene.Node;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.layout.ColumnConstraints;

import javafx.scene.layout.GridPane;

import javafx.scene.layout.Pane;

import javafx.scene.layout.Priority;

import javafx.scene.layout.VBox;

import javafx.scene.text.Text;

import javafx.scene.web.WebEngine;

import javafx.scene.web.WebEvent;

import javafx.scene.web.WebView;

import javafx.stage.Modality;

import javafx.stage.Stage;

import netscape.javascript.JSObject;

/**

 * Demonstrates a WebView object accessing a web page.

 *

 * @see javafx.scene.web.WebView

 * @see javafx.scene.web.WebEngine

 */

public class FXBrwsr extends Application {

    private static final Logger LOG = Logger.getLogger(FXBrwsr.class.getName());

    @Override

    public void start(Stage primaryStage) throws Exception {

        Pane root = new WebViewPane(getParameters().getUnnamed());

        primaryStage.setScene(new Scene(root, 1024, 768));

        LOG.info("Showing the stage");

        primaryStage.show();

        LOG.log(Level.INFO, "State shown: {0}", primaryStage.isShowing());

    }

    /**

     * Create a resizable WebView pane

     */

    private class WebViewPane extends Pane {

        private final JVMBridge bridge = new JVMBridge();

        public WebViewPane(List<String> params) {

            LOG.log(Level.INFO, "Initializing WebView with {0}", params);

            VBox.setVgrow(this, Priority.ALWAYS);

            setMaxWidth(Double.MAX_VALUE);

            setMaxHeight(Double.MAX_VALUE);

            WebView view = new WebView();

            view.setMinSize(500, 400);

            view.setPrefSize(500, 400);

            final WebEngine eng = view.getEngine();

            try {

                JVMBridge.addBck2BrwsrLoad(new InitBck2Brwsr(eng));

            } catch (TooManyListenersException ex) {

                LOG.log(Level.SEVERE, null, ex);

            }

            if (params.size() > 0) {

                LOG.log(Level.INFO, "loading page {0}", params.get(0));

                eng.load(params.get(0));

                LOG.fine("back from load");

            }

            eng.setOnAlert(new EventHandler<WebEvent<String>>() {

                @Override

                public void handle(WebEvent<String> t) {

                    final Stage dialogStage = new Stage();

                    dialogStage.initModality(Modality.WINDOW_MODAL);

                    dialogStage.setTitle("Warning");

                    final Button button = new Button("Close");

                    final Text text = new Text(t.getData());

                    VBox box = new VBox();

                    box.setAlignment(Pos.CENTER);

                    box.setSpacing(10);

                    box.setPadding(new Insets(10));

                    box.getChildren().addAll(text, button);

                    dialogStage.setScene(new Scene(box));

                    button.setCancelButton(true);

                    button.setOnAction(new EventHandler<ActionEvent>() {

                        @Override

                        public void handle(ActionEvent t) {

                            dialogStage.close();

                        }

                    });

                    dialogStage.centerOnScreen();

                    dialogStage.showAndWait();

                }

            });

            GridPane grid = new GridPane();

            grid.setVgap(5);

            grid.setHgap(5);

            GridPane.setConstraints(view, 0, 1, 2, 1, HPos.CENTER, VPos.CENTER, Priority.ALWAYS, Priority.ALWAYS);

            grid.getColumnConstraints().addAll(new ColumnConstraints(100, 100, Double.MAX_VALUE, Priority.ALWAYS, HPos.CENTER, true), new ColumnConstraints(40, 40, 40, Priority.NEVER, HPos.CENTER, true));

            grid.getChildren().addAll(view);

            getChildren().add(grid);

        }

        boolean initBck2Brwsr(WebEngine webEngine) {

            JSObject jsobj = (JSObject) webEngine.executeScript("window");

            LOG.log(Level.FINE, "window: {0}", jsobj);

            Object prev = jsobj.getMember("bck2brwsr");

            if ("undefined".equals(prev)) {

                System.getProperties().put("webEngine", webEngine);

                jsobj.setMember("bck2brwsr", bridge);

                return true;

            }

            return false;

        }

        @Override

        protected void layoutChildren() {

            List<Node> managed = getManagedChildren();

            double width = getWidth();

            double height = getHeight();

            double top = getInsets().getTop();

            double right = getInsets().getRight();

            double left = getInsets().getLeft();

            double bottom = getInsets().getBottom();

            for (int i = 0; i < managed.size(); i++) {

                Node child = managed.get(i);

                layoutInArea(child, left, top, width - left - right, height - top - bottom, 0, Insets.EMPTY, true, true, HPos.CENTER, VPos.CENTER);

            }

        }

        private class InitBck2Brwsr implements ChangeListener<Void>, Runnable {

            private final WebEngine eng;

            public InitBck2Brwsr(WebEngine eng) {

                this.eng = eng;

            }

            @Override

            public synchronized void changed(ObservableValue<? extends Void> ov, Void t, Void t1) {

                Platform.runLater(this);

                try {

                    wait();

                } catch (InterruptedException ex) {

                    LOG.log(Level.SEVERE, null, ex);

                }

            }

            @Override

            public synchronized void run() {

                initBck2Brwsr(eng);

                notifyAll();

            }

        }

    }

}