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package ensemble.samples.scenegraph.advancedstage;

import javafx.application.Application;
import javafx.event.ActionEvent;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Group;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.effect.Lighting;
import javafx.scene.input.MouseEvent;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.paint.CycleMethod;
import javafx.scene.paint.RadialGradient;
import javafx.scene.paint.Stop;
import javafx.scene.shape.Circle;
import javafx.scene.text.Font;
import javafx.scene.text.Text;
import javafx.scene.text.TextBoundsType;
import javafx.stage.Stage;
import javafx.stage.StageStyle;

/**
 * A sample with a control that creates a transparent stage that is centered on
 * your desktop. You can drag the stage with your mouse or use the scene
 * controls to minimize or close it. With a transparent stage, you must add
 * your own event handlers to perform these actions.
 *
 * @sampleName Advanced Stage
 * @preview preview.png
 * @see javafx.scene.paint.Color
 * @see javafx.scene.paint.RadialGradient
 * @see javafx.stage.StageStyle
 *
 * @related /Animation/Interpolator
 * @related /Graphics 2d/Paints/Radial Gradient
 * @related /Scenegraph/Stage
 */
public class AdvancedStageApp extends Application {

    // variables for initial position of the stage at the beginning of drag
    private double initX;
    private double initY;

    public Parent createContent() {
        // create a button for initializing our new stage
        Button button = new Button("Create a Stage");
        button.setStyle("-fx-font-size: 24;");
        button.setDefaultButton(true);
        button.setOnAction((ActionEvent t) -> {
            // INITIALISATION OF THE STAGE/SCENE

            // create stage which has set stage style transparent
            final Stage stage = new Stage(StageStyle.TRANSPARENT);

            // create root node of scene, i.e. group
            Group rootGroup = new Group();

            // create scene with set width, height and color
            Scene scene = new Scene(rootGroup, 200, 200, Color.TRANSPARENT);

            // set scene to stage
            stage.setScene(scene);

            // center stage on screen
            stage.centerOnScreen();

            // show the stage
            stage.show();

            // CREATION OF THE DRAGGER (CIRCLE)

            // create dragger with desired size
            Circle dragger = new Circle(100, 100, 100);

            // fill the dragger with some nice radial background
            dragger.setFill(new RadialGradient(-0.3, 135, 0.5, 0.5, 1, true,
                                               CycleMethod.NO_CYCLE,
                                               new Stop[] {
                new Stop(0, Color.DARKGRAY),
                new Stop(1, Color.BLACK)
            }));

            // when mouse button is pressed, save the initial position of screen
            rootGroup.setOnMousePressed((MouseEvent me) -> {
                initX = me.getScreenX() - stage.getX();
                initY = me.getScreenY() - stage.getY();
            });

            // when screen is dragged, translate it accordingly
            rootGroup.setOnMouseDragged((MouseEvent me) -> {
                stage.setX(me.getScreenX() - initX);
                stage.setY(me.getScreenY() - initY);
            });

            // CREATE MIN AND CLOSE BUTTONS
            // create button for closing application
            Button close = new Button("Close me");
            close.setOnAction((ActionEvent event) -> {
                stage.close();
            });

            // create button for minimalising application
            Button min = new Button("Minimize me");
            min.setOnAction((ActionEvent event) -> {
                stage.setIconified(true);
            });

            // CREATE SIMPLE TEXT NODE
            Text text = new Text("JavaFX"); //20, 110,
            text.setFill(Color.WHITESMOKE);
            text.setEffect(new Lighting());
            text.setBoundsType(TextBoundsType.VISUAL);
            text.setFont(Font.font(Font.getDefault().getFamily(), 50));

            // USE A LAYOUT VBOX FOR EASIER POSITIONING OF VISUAL NODES ON SCENE
            VBox vBox = new VBox();
            vBox.setSpacing(10);
            vBox.setPadding(new Insets(60, 0, 0, 20));
            vBox.setAlignment(Pos.TOP_CENTER);
            vBox.getChildren().addAll(text, min, close);

            // add all nodes to main root group
            rootGroup.getChildren().addAll(dragger, vBox);
        });
        return button;
    }

    @Override
    public void start(Stage primaryStage) throws Exception {
        primaryStage.setScene(new Scene(createContent()));
        primaryStage.show();
    }

    /**
     * Java main for when running without JavaFX launcher
     * @param args command line arguments
     */
    public static void main(String[] args) {
        launch(args);
    }
}