import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.layout.BorderPane;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;

public class PaintApp extends Application {
    
    // constants
    private static final int APP_WIDTH  = 800;
    private static final int APP_HEIGHT = 650;
    private static final int CANVAS_HEIGHT = 600;
    
    // GUI variables
    private BorderPane mainPane;
    private FlowPane   controlPanel;
    private MyCanvas   canvas;
    
    private Button     bnClear;

    @Override
    public void start(Stage stage) {
        
        mainPane = new BorderPane();
        
        setupControls();
        setupCanvas();
        
        Scene scene = new Scene(mainPane, APP_WIDTH, APP_HEIGHT);
        
        stage.setTitle("CS112 PaintApp FX");
        stage.setScene(scene);

        stage.show();
    }
    
    private void setupControls() {
        // Q. flow pane vs. hbox?
        controlPanel = new FlowPane(); 
        mainPane.setTop(controlPanel);
        
        bnClear = new Button("Clear Canvas");
        
        
        
        controlPanel.getChildren().addAll(bnClear);
    }
    
    private void setupCanvas() {
        canvas = new MyCanvas(APP_WIDTH, CANVAS_HEIGHT);
        
        // listener: MouseDragged
        
        canvas.setOnMouseDragged(e -> {
            // 1. get user's mouse location from e (of MouseEvent type)
            int mx = (int) e.getX();
            int my = (int) e.getY();            
            
            // 2. create one CircularStroke at location from (1)
            Stroke s = new CircularStroke(mx, my, 2, true);
            
            // 3. add the stroke from (2) to canvas
            canvas.addStroke(s);
        });
    }
    
    public static void main(String[] args) {
        launch(args); 
    }

}