import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.fxml.FXML;
import javafx.scene.control.ListView;
import javafx.scene.control.TextField;
import javafx.scene.control.Button;
import javafx.event.ActionEvent;

public class CalculatorController {

    @FXML
    private TextField inputField; // 用于显示输入
    @FXML
    private ListView<String> inputField1; // 用于显示计算记录
    @FXML
    private TextField inputField2;

    private double firstNumber = 0;
    private String operator = "";
    private boolean isOperationClicked = false;
    private StringBuilder currentInput = new StringBuilder();
    private ObservableList<String> operationHistory = FXCollections.observableArrayList();

    @FXML
    protected void handleNumberAction(ActionEvent event) {
        Button button = (Button) event.getSource();
        String number = button.getText();

        if (isOperationClicked) {
            currentInput.setLength(0);
            isOperationClicked = false;
        }

        currentInput.append(number);
        inputField.setText(currentInput.toString());
    }

    @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) {
        if (currentInput.length() > 0) {
            // 如果当前输入不为空，先保存当前输入为第二个数字
            if (firstNumber != 0 && !operator.isEmpty()) {
                handleEqualAction(null); // 计算上一个结果
            } else {
                firstNumber = Double.parseDouble(currentInput.toString()); // 设置第一个数字
            }
        }
        String firstNumberText = (firstNumber % 1 == 0) ? String.valueOf((int) firstNumber) : String.valueOf(firstNumber);
        operator = op;
        isOperationClicked = true;
        currentInput.append(operator);
        inputField.setText(firstNumberText + " " + operator + " "); // 显示当前操作
    }

    @FXML
    protected void handleEqualAction(ActionEvent event) {
        if (currentInput.length() == 0 || operator.isEmpty()) {
            return; // 如果没有输入或操作符，则不进行计算
        }

        double secondNumber = Double.parseDouble(currentInput.toString());
        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;
        }

        // 格式化输出结果
        String resultText = (result % 1 == 0) ? String.valueOf((int) result) : String.valueOf(result);
        inputField.setText(resultText);
        recordOperation(firstNumber, secondNumber, Double.parseDouble(resultText));

        firstNumber = result; // 使用当前结果作为下一个操作的第一个数字
        currentInput.setLength(0); // 清空当前输入
        operator = ""; // 重置操作符
        isOperationClicked = false; // 重置操作标记
    }

    private void recordOperation(double firstNumber, double secondNumber, double result) {
        // 检查结果是否为整数
        String formattedResult = (result % 1 == 0) ? String.valueOf((int) result) : String.valueOf(result);
        //检查firstNumber是否为整数
        String firstNumberText = (firstNumber % 1 == 0) ? String.valueOf((int) firstNumber) : String.valueOf(firstNumber);
        //检查secondNumber是否为整数
        String secondNumberText = (secondNumber % 1 == 0) ? String.valueOf((int) secondNumber) : String.valueOf(secondNumber);
        String operation = firstNumberText + " " + operator + " " + secondNumberText + " = " + formattedResult;

        // 更新计算记录，确保换行符的正确使用
        operationHistory.add(operation);
        inputField1.setItems(operationHistory);
    }

    @FXML
    protected void handleClearAction(ActionEvent event) {
        if (currentInput.length() > 0) {
            // 移除最后一个字符
            currentInput.deleteCharAt(currentInput.length() - 1);
            // 如果最后一个字符是空格且还有字符，继续删除空格（用于清理运算符后面的空格）
            while (currentInput.length() > 0 && currentInput.charAt(currentInput.length() - 1) == ' ') {
                currentInput.deleteCharAt(currentInput.length() - 1);
            }

            // 如果删除后为空且有操作符，则清空操作符
            if (currentInput.length() == 0 && !operator.isEmpty()) {
                operator = "";
            }

            inputField.setText(currentInput.toString());
        }
    }

    @FXML
    protected void handleClearsAction(ActionEvent event) {
        currentInput.setLength(0);
        firstNumber = 0;
        operator = "";
        inputField.clear();
    }

    @FXML
    protected void handlePointAction(ActionEvent event) {
        if (currentInput.indexOf(".") == -1) { // 检查是否已有小数点
            currentInput.append(".");
            inputField.setText(currentInput.toString());
        }
    }

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