using System.Text;
namespace Debug;
public class ModeSwitch
{
    public event Action<int>? Enter;
    private readonly string[] str = ["退出"];
    private int mode = 0;

    private string title;
    private string message;
    public ModeSwitch(string title, string[] a, Action<int> Enter) : this(title, a, Enter, string.Empty)
    {
    }
    public ModeSwitch(string title, string[] a, Action<int> Enter, string message)
    {
        this.Enter = Enter;
        str = a;
        this.title = title;
        this.message = message;
        Run();
    }
    private void Run()
    {
        Console.Clear();
        PrintCentered("<---  " + title + "  --->");
        int windowWidth = Console.WindowWidth;
        for (int i = 0; i < str.Length; i++)
        {
            // string paddedString = str[i].PadLeft((windowWidth + str[i].Length) / 2).PadRight(windowWidth);
            // Console.WriteLine(paddedString);
            PrintCentered($"{str[i]}");
        }
        // 判断message是不是为空

        for (int i = 0; i < windowWidth; i++)
        {
            Console.Write('-');
        }
        Console.WriteLine();
        PrintCentered("按W/S或↑/↓选择或数字键选择，按Enter确定,按Esc退出");
        if (message != string.Empty)
        {
            Console.Write(message);
        }
        do
        {
            var A1 = CalculateActualLength($"{mode}.{str[mode]}");
            Console.SetCursorPosition(windowWidth / 2 - A1, mode + 1);
            Console.Write("<<");
            Console.SetCursorPosition(windowWidth / 2 + A1 - 2, mode + 1);
            Console.Write(">>");
            var key = Console.ReadKey(true);
            Console.SetCursorPosition(windowWidth / 2 - A1, mode + 1);
            Console.Write("   ");
            Console.SetCursorPosition(windowWidth / 2 + A1 - 2, mode + 1);
            Console.Write("  ");
            // Console.Write(key.Key);
            if (key.Key >= ConsoleKey.D1 && key.Key <= ConsoleKey.D9)
            {
                int v1 = int.Parse(key.KeyChar.ToString());
                if (v1 >= 1 && v1 <= str.Length)
                    mode = v1 - 1;
            }
            else if (key.Key == ConsoleKey.Escape)
            {
                IsEnd();
                return;
            }
            else
                switch (key.Key)
                {
                    case ConsoleKey.UpArrow:
                    case ConsoleKey.W:
                        mode--;
                        break;
                    case ConsoleKey.S:
                    case ConsoleKey.DownArrow:
                        mode++;
                        break;
                    case ConsoleKey.Enter:
                        Enter?.Invoke(mode);
                        return;
                    default:
                        break;
                }
            mode = int.Max(0, int.Min(str.Length - 1, mode));
        } while (true);
    }
    /// <summary>
    /// 确实是否退出
    /// </summary>
    private void IsEnd()
    {
        Console.Clear();
        Console.WriteLine("再次按ESC退出,按回车键继续");
        var key = Console.ReadKey(true);
        if (key.Key == ConsoleKey.Escape)
        {
            Console.Clear();
            Environment.Exit(0);
        }
        else if (key.Key == ConsoleKey.Enter)
        {
            Run();
        }
    }
    private static int CalculateActualLength(string text)
    {
        Encoding encoding = Encoding.UTF8;
        int length = 0;
        foreach (char c in text)
        {
            byte[] bytes = encoding.GetBytes(c.ToString());
            if (bytes.Length > 1) // 汉字或宽字符
                length += 2;
            else
                length += 1;
        }
        return length;
    }

    public static void New(string title, string[] a, Action<int> Enter, string message)
    {
        _ = new ModeSwitch(title, a, Enter, message);
    }
    public static void New(string title, string[] a, Action<int> Enter)
    {
        _ = new ModeSwitch(title, a, Enter);
    }



    static void PrintCentered(string text)
    {
        // 获取控制台窗口的宽度
        int consoleWidth = Console.WindowWidth;
        // 计算文本的宽度，对于多字节字符（如中文），可能需要特殊处理
        int textLength = GetTextDisplayLength(text);
        // 计算左右两侧应该填充的空格数
        int padding = (consoleWidth - textLength) / 2;

        if (padding > 0)
        {
            // 打印左侧空格
            Console.Write(new string(' ', padding));
        }
        // 打印文本
        Console.WriteLine(text);
    }

    static int GetTextDisplayLength(string text)
    {
        // 默认每个字符占一个位置，包括ASCII字符和非ASCII字符（如中文）
        // return text.Length;

        //  * 如果需要更精确地计算字符宽度（例如考虑全角半角字符的区别），可以使用以下代码：

        int length = 0;
        foreach (char c in text)
        {
            // 假设所有非ASCII字符都是双宽度字符
            length += char.IsHighSurrogate(c) || char.IsLowSurrogate(c) || c > 127 ? 2 : 1;
        }
        return length;

    }

}