import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class BaseConverterGUI extends JFrame implements ActionListener {
    private JTextField inputField;
    private JTextField sourceBaseField;
    private JTextField targetBaseField;
    private JButton convertButton;
    private JLabel resultLabel;

    public BaseConverterGUI() {
        setTitle("基数转换器");
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLayout(new FlowLayout());

        // 输入框
        inputField = new JTextField(10);
        add(new JLabel("输入数值:"));
        add(inputField);

        // 源基数输入框
        sourceBaseField = new JTextField(5);
        add(new JLabel("源基数:"));
        add(sourceBaseField);

        // 目标基数输入框
        targetBaseField = new JTextField(5);
        add(new JLabel("目标基数:"));
        add(targetBaseField);

        // 转换按钮
        convertButton = new JButton("转换");
        convertButton.addActionListener(this);
        add(convertButton);

        // 结果标签
        resultLabel = new JLabel("结果:");
        add(resultLabel);

        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == convertButton) {
            String numStr = inputField.getText();
            int sourceBase = Integer.parseInt(sourceBaseField.getText());
            int targetBase = Integer.parseInt(targetBaseField.getText());

            try {
                String convertedNum = convertBase(numStr, sourceBase, targetBase);
                resultLabel.setText("转换结果: " + convertedNum + " (基数 " + targetBase + ")");
            } catch (NumberFormatException ex) {
                JOptionPane.showMessageDialog(this, "输入无效，请检查输入。");
            }
        }
    }

    private String convertBase(String numStr, int sourceBase, int targetBase) {
        int decimal = convertToDecimal(numStr, sourceBase);
        return convertFromDecimal(decimal, targetBase);
    }

    private int convertToDecimal(String numStr, int base) {
        return Integer.parseInt(numStr, base);
    }

    private String convertFromDecimal(int decimal, int base) {
        if (base < 2 || base > 16) {
            throw new IllegalArgumentException("基数必须在2到16之间");
        }
        StringBuilder result = new StringBuilder();
        boolean isNegative = decimal < 0;
        decimal = Math.abs(decimal);

        while (decimal > 0) {
            int remainder = decimal % base;
            if (remainder < 10) {
                result.append(remainder);
            } else {
                result.append((char) ('A' + remainder - 10)); // Convert to A-F for bases > 10
            }
            decimal /= base;
        }

        if (result.length() == 0) {
            return "0";
        }

        if (isNegative) {
            result.append('-');
        }

        return result.reverse().toString();
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(() -> new BaseConverterGUI());
    }
}