package java6257.lesson06;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.HashMap;
import java.util.Map;

public class Main {

    // 符号转化为数字
    public static int getNum(char c) {
        if (Character.isDigit(c)) {
            return c - '0';
        }
        if ('a' <= c && c <= 'z') {
            return c - 'a' + 10;
        }
        if ('A' <= c && c <= 'Z') {
            return c - 'A' + 10;
        }
        return 0;
    }

    // 数字转化为符号
    public static char getChar(int num) {
        if (num >= 0 && num <= 9) {
            return (char) (num + '0');
        } else {
            return (char) (num - 10 + 'A');
        }
    }

    // 将字符串根据进制转化为数字
    public static long toNum(String number, int base) {
        int n = number.length();
        long num = 0;
        for (int i = 0; i < n; i++) {
            char ch = number.charAt(i);
            num *= base;
            num += getNum(ch);
        }
        return num;
    }

    // 将数字根据进制转化为字符串
    public static String toString(long num, int base) {
        if (num == 0) return "0";

        StringBuilder ans = new StringBuilder();
        while (num > 0) {
            ans.append(getChar((int) (num % base)));
            num /= base;
        }
        ans.reverse();
        return ans.toString();
    }

    // 执行进制转换
    public static String convertBase(String num, int stBase, int enBase) {
        return toString(toNum(num, stBase), enBase);
    }

    public static void main(String[] args) {
        // 创建窗口
        JFrame frame = new JFrame("进制转换器");
        frame.setSize(400, 300);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setLayout(null);

        // 源进制输入框
        JLabel stBaseLabel = new JLabel("源进制（2-16）:");
        stBaseLabel.setBounds(50, 20, 120, 25);
        frame.add(stBaseLabel);

        JTextField stBaseField = new JTextField();
        stBaseField.setBounds(200, 20, 100, 25);
        frame.add(stBaseField);

        // 目标进制输入框
        JLabel enBaseLabel = new JLabel("目标进制（2-16）:");
        enBaseLabel.setBounds(50, 60, 120, 25);
        frame.add(enBaseLabel);

        JTextField enBaseField = new JTextField();
        enBaseField.setBounds(200, 60, 100, 25);
        frame.add(enBaseField);

        // 源数字输入框
        JLabel numberLabel = new JLabel("源数字:");
        numberLabel.setBounds(50, 100, 120, 25);
        frame.add(numberLabel);

        JTextField numberField = new JTextField();
        numberField.setBounds(200, 100, 100, 25);
        frame.add(numberField);

        // 目标数字显示框
        JLabel resultLabel = new JLabel("转换后的数字:");
        resultLabel.setBounds(50, 140, 120, 25);
        frame.add(resultLabel);

        JTextField resultField = new JTextField();
        resultField.setBounds(200, 140, 100, 25);
        resultField.setEditable(false);  // 只读
        frame.add(resultField);

        // 转换按钮
        JButton convertButton = new JButton("转换");
        convertButton.setBounds(150, 180, 100, 30);
        frame.add(convertButton);

        // 按钮监听事件
        convertButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                try {
                    // 获取输入的源进制、目标进制和数字
                    int stBase = Integer.parseInt(stBaseField.getText());
                    int enBase = Integer.parseInt(enBaseField.getText());
                    String number = numberField.getText();

                    // 检查进制范围
                    if (stBase < 2 || stBase > 16 || enBase < 2 || enBase > 16) {
                        JOptionPane.showMessageDialog(frame, "进制必须在 2 到 16 之间", "错误", JOptionPane.ERROR_MESSAGE);
                        return;
                    }

                    // 进行转换
                    String result = convertBase(number, stBase, enBase);
                    resultField.setText(result);
                } catch (NumberFormatException ex) {
                    JOptionPane.showMessageDialog(frame, "请输入正确的数字格式", "错误", JOptionPane.ERROR_MESSAGE);
                }
            }
        });

        // 显示窗口
        frame.setVisible(true);
    }
}