import com.sun.glass.ui.Robot;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.value.ChangeListener;
import javafx.scene.Group;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.paint.Color;
import javafx.scene.shape.Circle;
import javafx.stage.Stage;
import javafx.util.Duration;

/**
 * Test program to show a bug in reading the initial window position of a
 * decorated, secondary stage on Ubuntu 14.04. This worked on earlier versions
 * of Ubuntu and also works fine on Mac and Windows.
 */
public class StagePositionBug extends Application {

    private static final int WIDTH = 400;
    private static final int HEIGHT = 300;
    private static final int CENTER_X = WIDTH / 2;
    private static final int CENTER_Y = HEIGHT / 2;

    private Robot robot;

    private void printStats(Scene scene) {
        double sceneX = scene.getX();
        double sceneY = scene.getY();
        double stageX = scene.getWindow().getX();
        double stageY = scene.getWindow().getY();
        System.err.println("");
        System.err.println("Scene pos: " + sceneX + ", " + sceneY);
        System.err.println("Stage pos: " + stageX + ", " + stageY);
        System.err.println("Inner pos (computed): " + (stageX+sceneX) + ", " + (stageY+sceneY));
    }

    private void moveCursorToCenter(Scene scene) {
        int centerX = CENTER_X;
        int centerY = CENTER_Y;
        centerX += scene.getX() + scene.getWindow().getX();
        centerY += scene.getY() + scene.getWindow().getY();
        robot.mouseMove(centerX, centerY);
    }

    @Override public void start(Stage unusedPrimaryStage) {
        robot = com.sun.glass.ui.Application.GetApplication().createRobot();

        // Create a new Stage, ignoring the primary stage
        final Stage stage = new Stage();

        // Uncomment the following and the problem goes away problem
//         stage.setX(100);
//         stage.setY(100);

        Group root = new Group();
        final Scene scene = new Scene(root, 400, 300);

        ChangeListener<Number> listener = (o, oldVal, newVal) -> printStats(scene);
        stage.xProperty().addListener(listener);
        stage.yProperty().addListener(listener);
        scene.xProperty().addListener(listener);
        scene.yProperty().addListener(listener);

        final Label label = new Label("Waiting...");
        label.setLayoutX(5);
        label.setLayoutY(5);

        final Button button = new Button("Reposition cursor");
        button.setLayoutX(5);
        button.setLayoutY(30);
        button.setDisable(true);

        Circle circ = new Circle(CENTER_X, CENTER_Y, 1, Color.RED);

        root.getChildren().addAll(label, button, circ);
        stage.setScene(scene);
        stage.show();

        KeyFrame kf = new KeyFrame(Duration.millis(750), e -> {
            moveCursorToCenter(scene);
            label.setText("Cursor should now be centered on red circle");
            button.setDisable(false);

        });

        final Timeline t = new Timeline(kf);
        t.play();

        button.setOnAction(e -> {
            button.setDisable(true);
            label.setText("Waiting...");
            t.playFromStart();
        });
    }

    public static void main(String[] args) {
        Application.launch(args);
    }
}