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

public class CalculatorControl {

    @FXML
    private TextArea display;

    private double firstNumber;
    private double secondNumber;
    private String operation;
    private boolean awaitingSecondNumber;

    @FXML
    void onClearButtonClicked(ActionEvent event) {
        display.clear();
        firstNumber = 0;
        secondNumber = 0;
        operation = null;
        awaitingSecondNumber = false;
    }

    @FXML
    void onClearEntryButtonClicked(ActionEvent event) {
        display.clear();
    }

    @FXML
    void onDeleteButtonClicked(ActionEvent event) {
        String currentText = display.getText();
        if (currentText != null && !currentText.isEmpty()) {
            display.setText(currentText.substring(0, currentText.length() - 1));
        }
    }

    @FXML
    void onEqualsButtonClicked(ActionEvent event) {
        if (awaitingSecondNumber) {
            String displayText = display.getText();
            String[] parts = displayText.split(" ");
            try {
                secondNumber = Double.parseDouble(parts[parts.length - 1]);
                // 检查两个数字是否都是整数
                if ((firstNumber % 1 == 0) && (secondNumber % 1 == 0)) {
                    int intFirstNumber = (int) firstNumber;
                    int intSecondNumber = (int) secondNumber;
                    switch (operation) {
                        case "+":
                            int result = intFirstNumber + intSecondNumber;
                            display.setText(String.format("%d + %d = %d", intFirstNumber, intSecondNumber, result));
                            break;
                        case "-":
                            result = intFirstNumber - intSecondNumber;
                            display.setText(String.format("%d - %d = %d", intFirstNumber, intSecondNumber, result));
                            break;
                        case "*":
                            result = intFirstNumber * intSecondNumber;
                            display.setText(String.format("%d * %d = %d", intFirstNumber, intSecondNumber, result));
                            break;
                        case "/":
                            if (intSecondNumber == 0) {
                                display.setText("Error");
                            } else {
                                result = intFirstNumber / intSecondNumber;
                                display.setText(String.format("%d / %d = %d", intFirstNumber, intSecondNumber, result));
                            }
                            break;
                        case "%":
                            result = intFirstNumber % intSecondNumber;
                            display.setText(String.format("%d %% %d = %d", intFirstNumber, intSecondNumber, result));
                            break;
                    }
                } else if ((firstNumber % 1 != 0) || (secondNumber % 1 != 0)) {
                    double doubleFirstNumber = firstNumber;
                    double doubleSecondNumber = secondNumber;
                    switch (operation) {
                        case "+":
                            double result = doubleFirstNumber + doubleSecondNumber;
                            display.setText(String.format("%.2f + %.2f = %.2f", doubleFirstNumber, doubleSecondNumber, result));
                            break;
                        case "-":
                            result = doubleFirstNumber - doubleSecondNumber;
                            display.setText(String.format("%.2f - %.2f = %.2f", doubleFirstNumber, doubleSecondNumber, result));
                            break;
                        case "*":
                            result = doubleFirstNumber * doubleSecondNumber;
                            display.setText(String.format("%.2f * %.2f = %.2f", doubleFirstNumber, doubleSecondNumber, result));
                            break;
                        case "/":
                            if (doubleSecondNumber == 0) {
                                display.setText("Error");
                            } else {
                                result = doubleFirstNumber / doubleSecondNumber;
                                display.setText(String.format("%.2f / %.2f = %.2f", doubleFirstNumber, doubleSecondNumber, result));
                            }
                            break;
                        case "%":
                            double intPart = Math.floor(doubleFirstNumber);
                            double remainder = doubleFirstNumber - intPart;
                            display.setText(String.format("%.2f %% %.2f = %.2f", doubleFirstNumber, doubleSecondNumber, remainder));
                            break;
                    }
                } else {
                    display.setText("Non-integer input");
                }
                awaitingSecondNumber = false;
            } catch (NumberFormatException e) {
                display.setText("Error");
            }
        }
    }


    @FXML
    void onNumberButtonClicked(ActionEvent event) {
        Button button = (Button) event.getSource();
        String buttonText = button.getText();
        display.appendText(buttonText);
    }

    @FXML
    void onOperationButtonClicked(ActionEvent event) {
        Button button = (Button) event.getSource();
        String buttonText = button.getText();
        if (!awaitingSecondNumber) {
            String displayText = display.getText();
            String[] parts = displayText.split(" ");
            try {
                firstNumber = Double.parseDouble(parts[parts.length - 1]);
                operation = buttonText;
                awaitingSecondNumber = true;
                display.appendText(" " + buttonText + " ");
            } catch (NumberFormatException e) {
                display.setText("Error");
            }
        }
    }
}