package fx;

import javafx.animation.KeyFrame;
import javafx.animation.KeyValue;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.binding.DoubleBinding;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleDoubleProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.geometry.Point2D;
import javafx.scene.Cursor;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.ScrollPane;
import javafx.scene.effect.DropShadow;
import javafx.scene.effect.Reflection;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.FlowPane;
import javafx.scene.layout.Pane;
import javafx.scene.paint.Color;
import javafx.stage.Stage;
import javafx.stage.StageStyle;
import javafx.stage.Window;
import javafx.util.Duration;

public class UndecoratedMinSize2 extends Application {

    private ScrollPane scrollPane;
    private ObjectProperty<Point2D> anchor = new SimpleObjectProperty<Point2D>(null);
    private SimpleDoubleProperty widthStage = new SimpleDoubleProperty();
    private SimpleDoubleProperty heightStage = new SimpleDoubleProperty();
    public static void main(String[] args) {
        launch(args);
    }
    @Override
    public void start(final Stage primaryStage) {
        Pane mainContainer = initstage(primaryStage);
        mainContainer.getChildren().addAll(
                createButton());
        primaryStage.show();// Show the primaryStage
    }
    private Pane initstage(Stage primaryStage) {
        primaryStage.setTitle("Hello Java");
        primaryStage.initStyle(StageStyle.TRANSPARENT);
  /* The minWidth or minHeight is for the stage "DECORATED", it has on effect to the stage non "DECORATED". */
        primaryStage.setMinWidth(600);
        primaryStage.setMinHeight(400);
        final FlowPane mainContainer = new FlowPane();
        mainContainer.setStyle(
                "-fx-background-color: white; " +
                        "-fx-background-radius: 10px; " +
                        "-fx-padding: 10px;" +
                        "-fx-hgap: 30px; " +
                        "-fx-vgap: 50px;");
        scrollPane = new ScrollPane();
        scrollPane.setStyle("-fx-background-radius: 10px;");
        scrollPane.setContent(mainContainer);
        scrollPane.setPannable(true);
        mainContainer.prefWidthProperty().bind(new DoubleBinding() {
            {
                super.bind(scrollPane.viewportBoundsProperty());
            }
            @Override
            protected double computeValue() {
                Bounds bounds = scrollPane.getViewportBounds();
                if (bounds == null) {
                    return 0;
                } else {
                    return bounds.getWidth();
                }
            }
        });
        AnchorPane root = new AnchorPane();
        root.setStyle(
                "-fx-border-color: black; " +
                        "-fx-border-width: 1px; " +
                        "-fx-border-radius: 10px; " +
                        "-fx-background-color: rgba(0, 0, 0, 0); " +
                        "-fx-background-radius: 10px;");
        DropShadow dropShadow = new DropShadow();
        dropShadow.setRadius(20.0);
        // dropShadow.setSpread(0.2);
        root.setEffect(dropShadow);
        enableDragging(root);
        root.getChildren().add(scrollPane);
        AnchorPane.setTopAnchor(scrollPane, 0.0);
        AnchorPane.setRightAnchor(scrollPane, 10.0);
        AnchorPane.setBottomAnchor(scrollPane, 10.0);
        AnchorPane.setLeftAnchor(scrollPane, 10.0);
        AnchorPane superRoot = new AnchorPane();
        superRoot.getChildren().add(root);
        AnchorPane.setTopAnchor(root, 10.0);
        AnchorPane.setRightAnchor(root, 10.0);
        AnchorPane.setBottomAnchor(root, 10.0);
        AnchorPane.setLeftAnchor(root, 10.0);
        Scene scene = new Scene(superRoot, 950, 650, Color.TRANSPARENT);
//        scene.getStylesheets().add(getClass().getResource("controls.css").toExternalForm());
        primaryStage.setScene(scene);
        return mainContainer;
    }
    /**
     * Enable the root node to be dragged. Realize some drag functions.
     *
     * @param root - the root node
     */
    private void enableDragging(final AnchorPane root) {
  /* This mouse event is for resizing window. Define some specific cursor patterns. */
        root.setOnMouseMoved(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent me) {
                if ((me.getX() > root.getWidth() - 10 && me.getX() < root.getWidth() + 10)
                        && (me.getY() > root.getHeight() - 10 && me.getY() < root.getHeight() + 10)) {
                    root.setCursor(Cursor.SE_RESIZE);
                } else if (me.getX() > root.getWidth() - 5 && me.getX() < root.getWidth() + 5) {
                    root.setCursor(Cursor.H_RESIZE);
                } else if (me.getY() > root.getHeight() - 5 && me.getY() < root.getHeight() + 5) {
                    root.setCursor(Cursor.V_RESIZE);
                } else {
                    root.setCursor(Cursor.DEFAULT);
                }
            }
        });
  /* when mouse button is pressed, save the initial position of screen. */
        root.setOnMousePressed(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent me) {
                Window primaryStage = root.getScene().getWindow();
                anchor.set(new Point2D(me.getScreenX() - primaryStage.getX(), me.getScreenY() - primaryStage.getY()));
                widthStage.set(primaryStage.getWidth());
                heightStage.set(primaryStage.getHeight());
            }
        });
  /* when mouse button is released, clear the initial position of screen. */
        root.setOnMouseReleased(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent me) {
                anchor.set(null);
            }
        });
  /* when screen is dragged, translate it accordingly. */
        root.setOnMouseDragged(new EventHandler<MouseEvent>() {
            public void handle(MouseEvent me) {
                if (anchor.get() != null) {// The drag event on the root really takes place.
                    Window primaryStage = root.getScene().getWindow();
                    if (root.getCursor() == Cursor.H_RESIZE) {
                        primaryStage.setWidth(widthStage.get() + (me.getScreenX() - (anchor.get().getX() + primaryStage.getX())));
                    } else if (root.getCursor() == Cursor.V_RESIZE) {
                        System.err.println("resize " + (heightStage.get() + (me.getScreenY() - (anchor.get().getY() + primaryStage.getY()))));
                        primaryStage.setHeight(heightStage.get() + (me.getScreenY() - (anchor.get().getY() + primaryStage.getY())));
                    } else if (root.getCursor() == Cursor.SE_RESIZE) {
                        primaryStage.setWidth(widthStage.get() + (me.getScreenX() - (anchor.get().getX() + primaryStage.getX())));
                        primaryStage.setHeight(heightStage.get() + (me.getScreenY() - (anchor.get().getY() + primaryStage.getY())));
                    } else {// moving the stage
                        primaryStage.setX(me.getScreenX() - anchor.get().getX());
                        primaryStage.setY(me.getScreenY() - anchor.get().getY());
                    }
                }
            }
        });
    }
    /**
     * Define a button
     * @return a button
     */
    private Node createButton() {
        Button button = new Button();
        button.setEffect(new Reflection());
        button.setText("Say 'Hello Java'");
        button.setOnAction(new EventHandler<ActionEvent>() {
            @Override
            public void handle(ActionEvent event) {
                System.out.println("Hello Java!");
            }
        });
  /* add an animation effect */
        Timeline timeline = new Timeline();
        timeline.setCycleCount(Timeline.INDEFINITE);
        timeline.setAutoReverse(true);
        timeline.getKeyFrames().addAll(
                new KeyFrame(Duration.ZERO, new KeyValue(button.opacityProperty(), 1.0)),
                new KeyFrame(new Duration(5000), new KeyValue(button.opacityProperty(), 0.0)));
        timeline.play();
  /* set CSS style */
        button.setStyle(
//                        "-fx-font: 14px 'Cambria'; " +
                        "-fx-text-fill: #006464; " +
                        "-fx-background-color: #e79423; " +
                        "-fx-background-radius: 20.0; " +
                        "-fx-padding: 5.0;");
        return button;
    }
}