import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.*;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.*;
import javafx.stage.Stage;

public class Main extends Application {
    private TextField display = new TextField();
    private Button[] numberButtons = new Button[10];
    private Button addButton, subtractButton, multiplyButton, divideButton, modulusButton, equalsButton, clearButton;
    private Label statusLabel = new Label("");

    private SimpleDoubleProperty firstOperand = new SimpleDoubleProperty(0);
    private SimpleDoubleProperty secondOperand = new SimpleDoubleProperty(0);
    private String operator = "";

    @Override
    public void start(Stage primaryStage) {
        GridPane grid = new GridPane();
        grid.setAlignment(Pos.CENTER);
        grid.setHgap(10);
        grid.setVgap(10);

        display.setEditable(false);
        grid.add(display, 0, 0, 4, 1);

        for (int i = 0; i < 10; i++) {
            numberButtons[i] = new Button(String.valueOf(i));
            grid.add(numberButtons[i], (i % 3), (i / 3) + 1);
        }

        addButton = new Button("+");
        subtractButton = new Button("-");
        multiplyButton = new Button("*");
        divideButton = new Button("/");
        modulusButton = new Button("%");
        equalsButton = new Button("=");
        clearButton = new Button("C");

        grid.add(addButton, 3, 1);
        grid.add(subtractButton, 3, 2);
        grid.add(multiplyButton, 3, 3);
        grid.add(divideButton, 3, 4);
        grid.add(modulusButton, 3, 5);
        grid.add(equalsButton, 3, 6);
        grid.add(clearButton, 3, 7);

        for (int i = 0; i < 10; i++) {
            int finalI = i;
            numberButtons[i].setOnAction(e -> display.appendText(String.valueOf(finalI)));
        }

        addButton.setOnAction(e -> setOperator("+"));
        subtractButton.setOnAction(e -> setOperator("-"));
        multiplyButton.setOnAction(e -> setOperator("*"));
        divideButton.setOnAction(e -> setOperator("/"));
        modulusButton.setOnAction(e -> setOperator("%"));
        equalsButton.setOnAction(e -> calculate());
        clearButton.setOnAction(e -> clear());

        Scene scene = new Scene(grid, 300, 400);
        primaryStage.setTitle("Calculator");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

    private void setOperator(String op) {
        if (!operator.isEmpty()) {
            calculate();
        }
        operator = op;
        firstOperand.setValue(Double.parseDouble(display.getText()));
        display.clear();
    }

    private void calculate() {
        if (!operator.isEmpty()) {
            secondOperand.setValue(Double.parseDouble(display.getText()));
            double result = 0;
            switch (operator) {
                case "+":
                    result = firstOperand.get() + secondOperand.get();
                    break;
                case "-":
                    result = firstOperand.get() - secondOperand.get();
                    break;
                case "*":
                    result = firstOperand.get() * secondOperand.get();
                    break;
                case "/":
                    if (secondOperand.get() != 0) {
                        result = firstOperand.get() / secondOperand.get();
                    } else {
                        statusLabel.setText("Cannot divide by zero");
                        return;
                    }
                    break;
                case "%":
                    result = firstOperand.get() % secondOperand.get();
                    break;
            }
            display.setText(String.format("%.2f", result));
            operator = "";
        }
    }

    private void clear() {
        display.clear();
        firstOperand.setValue(0);
        secondOperand.setValue(0);
        operator = "";
    }

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