/**

 * 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.logging.Level;

import java.util.logging.Logger;

import javafx.application.Application;

import javafx.beans.value.ChangeListener;

import javafx.beans.value.ObservableValue;

import javafx.concurrent.Worker;

import javafx.event.ActionEvent;

import javafx.event.EventHandler;

import javafx.geometry.HPos;

import javafx.geometry.Insets;

import javafx.geometry.VPos;

import javafx.scene.Node;

import javafx.scene.Scene;

import javafx.scene.control.Button;

import javafx.scene.control.TextField;

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.web.WebEngine;

import javafx.scene.web.WebEvent;

import javafx.scene.web.WebView;

import javafx.stage.Stage;

import javax.swing.JOptionPane;

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));

        primaryStage.show();

    }

    /**

     * Create a resizable WebView pane

     */

    private class WebViewPane extends Pane {

        private final JVMBridge bridge = new JVMBridge();

        public WebViewPane(List<String> 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();

            final TextField locationField = new TextField();

            LOG.info("params : " + params);

            if (params.size() > 0) {

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

                    @Override

                    public void changed(ObservableValue<? extends Worker.State> ov, Worker.State t, Worker.State t1) {

                        LOG.info("about to init bck2brwsr");

                        initBck2Brwsr(eng);

                        LOG.info("done init of bck2brwsr");

                    }

                });

                LOG.info("loading page " + params.get(0));

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

                LOG.info("done loading page ");

                locationField.setText(params.get(0));

            }

            locationField.setMaxHeight(Double.MAX_VALUE);

            Button goButton = new Button("Go");

            goButton.setDefaultButton(true);

            EventHandler<ActionEvent> goAction = new EventHandler<ActionEvent>() {

                @Override

                public void handle(ActionEvent event) {

                    eng.load(locationField.getText().startsWith("http://") ? locationField.getText() : "http://" + locationField.getText());

                }

            };

            goButton.setOnAction(goAction);

            locationField.setOnAction(goAction);

            eng.locationProperty().addListener(new ChangeListener<String>() {

                @Override

                public void changed(ObservableValue<? extends String> observable, String oldValue, String newValue) {

                    locationField.setText(newValue);

                }

            });

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

                @Override

                public void handle(WebEvent<String> t) {

                    JOptionPane.showMessageDialog(null, t.getData());

                }

            });

            GridPane grid = new GridPane();

            grid.setVgap(5);

            grid.setHgap(5);

            GridPane.setConstraints(locationField, 0, 0, 1, 1, HPos.CENTER, VPos.CENTER, Priority.ALWAYS, Priority.SOMETIMES);

            GridPane.setConstraints(goButton, 1, 0);

            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(locationField, goButton, view);

            getChildren().add(grid);

        }

        void initBck2Brwsr(WebEngine webEngine) {

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

            LOG.info("window: " + jsobj);

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

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

            if (prev instanceof JSObject) {

                jsobj.setMember("jvmBridge", bridge);

                JSObject jso = (JSObject) prev;

                Object len = jso.getMember("length");

                if (len instanceof Integer) {

                    for (int i = 0; i < (Integer) len; i++) {

                        Object slt = jso.getSlot(i);

                        if (slt instanceof String) {

                            try {

                                bridge.loadClass((String) slt);

                            } catch (ClassNotFoundException ex) {

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

                            }

                        }

                    }

                    LOG.info("bck2brwsr: " + jsobj.getMember("bck2brwsr"));

                }

            }

        }

        @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);

            }

        }

    }

}