import javafx.fxml.FXML;
import javafx.scene.control.TextField;
import javafx.scene.control.Button;
import javafx.event.ActionEvent;

public class CalculatorController {

    @FXML
    private TextField inputField;
    @FXML
    private TextField inputField1; // 用于显示计算记录

    private double firstNumber = 0;
    private String operator = "";
    private boolean isOperationClicked = false;

    @FXML
    protected void handleNumberAction(ActionEvent event) {
        Button button = (Button) event.getSource();
        String number = button.getText();
        if (isOperationClicked) {
            inputField.clear();
            isOperationClicked = false;
        }
        inputField.setText(inputField.getText() + number);
    }

    @FXML
    protected void handleAddAction(ActionEvent event) {
        performOperation("+");
    }

    @FXML
    protected void handleSubtractAction(ActionEvent event) {
        performOperation("-");
    }

    @FXML
    protected void handleMultiplyAction(ActionEvent event) {
        performOperation("*");
    }

    @FXML
    protected void handleDivideAction(ActionEvent event) {
        performOperation("/");
    }

    @FXML
    protected void handleModulusAction(ActionEvent event) {
        performOperation("%");
    }

    private void performOperation(String op) {
        firstNumber = Double.parseDouble(inputField.getText());
        operator = op;
        isOperationClicked = true;
    }

    @FXML
    protected void handleEqualAction(ActionEvent event) {
        double secondNumber = Double.parseDouble(inputField.getText());
        double result = 0;

        switch (operator) {
            case "+":
                result = firstNumber + secondNumber;
                break;
            case "-":
                result = firstNumber - secondNumber;
                break;
            case "*":
                result = firstNumber * secondNumber;
                break;
            case "/":
                if (secondNumber != 0) {
                    result = firstNumber / secondNumber;
                } else {
                    inputField.setText("Error");
                    return;
                }
                break;
            case "%":
                result = firstNumber % secondNumber;
                break;
            default:
                return;
        }

        inputField.setText(String.valueOf(result));
        recordOperation(firstNumber, secondNumber, result);
    }

    private void recordOperation(double a, double b, double result) {
        String operation = a + " " + operator + " " + b + " = " + result;
        inputField1.setText(inputField1.getText() + "\n" + operation);
    }

    @FXML
    protected void handleClearAction(ActionEvent event) {
        inputField.clear();
        firstNumber = 0;
        operator = "";
        isOperationClicked = false;
    }

    @FXML
    protected void handleClearsAction(ActionEvent event) {
        inputField1.clear();
    }

    @FXML
    protected void handlePointAction(ActionEvent event) {
        if (!inputField.getText().contains(".")) {
            inputField.setText(inputField.getText() + ".");
        }
    }

    @FXML
    protected void handleRemoveAction(ActionEvent event) {
        inputField1.clear();
    }
}