using System;
using System.Collections.Generic; 
using System.Drawing;
using System.Text;
using System.Linq;
using Microsoft.AspNetCore.Http;
using System.IO; 
using System.Collections.Concurrent; 

namespace ReZero.SuperAPI 
{

    /// <summary>
    /// ** 描述：验证码类
    /// ** 创始时间：2015-6-30
    /// ** 修改时间：-
    /// ** 修改人：sunkaixuan
    /// </summary>
    public class VerifyCodeSugar
    {
        private static readonly char[] chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789".ToCharArray();
        private static readonly Random random = new Random();
        internal static (string,byte[]) Create()
        {
            string code = GenerateCode(4);
            byte[] imageBytes = GenerateImage(code);
            return (code,imageBytes);
        }

        private static string GenerateCode(int length)
        {
            StringBuilder sb = new StringBuilder(length);
            for (int i = 0; i < length; i++)
            {
                sb.Append(chars[random.Next(chars.Length)]);
            }
            return sb.ToString();
        }
         
        private static byte[] GenerateImage(string code)
        {
            return new byte[] { };
        }
    }
}