using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Debug;

public class ModeSwitch
{
    public event Action<int>? Enter;
    private readonly string[] str = ["退出"];
    private readonly int mode = 0;
    public ModeSwitch(string title, string[] a, Action<int> Enter)
    {
        this.Enter = Enter;
        str = a;
        Console.WriteLine(title);
        for (int i = 0; i < str.Length; i++)
        {
            Console.WriteLine($"{i}.{str[i]}");

        }
        do
        {
            Console.SetCursorPosition(CalculateActualLength($"{mode}.{str[mode]}") + 1, mode + 1);
            Console.Write('>');
            var key = Console.ReadKey(true);
            Console.SetCursorPosition(CalculateActualLength($"{mode}.{str[mode]}") + 1, mode + 1);
            Console.Write(' ');
            if (key.Key >= ConsoleKey.D0 && key.Key <= ConsoleKey.D9)
            {
                int v1 = int.Parse(key.KeyChar.ToString());
                if (v1 >= 0 && v1 < str.Length)
                    mode = v1;
            }
            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);

        //Console.CursorVisible = false;
    }
    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)
    {
        _ = new ModeSwitch(title, a, Enter);
    }





}