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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Reflection;
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using System.Text;
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using System.Threading.Tasks;
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namespace GDZZ.Core
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{
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public class InvitaCode
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{
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//自定义进制(0、O没有加入,容易混淆；同时排除X,用X补位)
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private static char[] r = new char[] { 'Q', 'W', 'E', '8', 'A', 'S', '2', 'D', 'Z', '9', 'C', '7', 'P', '5', 'I', 'K', '3', 'M', 'J', 'U', 'F', 'R', '4', 'V', 'Y', 'L', 'T', 'N', '6', 'B', 'G', 'H' };
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//不能与自定义进制有重复
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private static char b = 'X';
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//进制长度
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private static int binLen = r.Length;
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//生成的邀请码长度
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private static int length = 6;
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/// <summary>
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/// 根据ID生成六位随机邀请码
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/// </summary>
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/// <param name="id">用户id</param>
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/// <returns>返回6位邀请码</returns>
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public static string Encode(long id)
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{
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char[] buf = new char[32];
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int charPos = 32;
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while ((id / binLen) > 0)
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{
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int ind = (int)(id % binLen);
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buf[--charPos] = r[ind];
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id /= binLen;
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}
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buf[--charPos] = r[(int)(id % binLen)];
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String str = new String(buf, charPos, (32 - charPos));
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//不够长度的自动随机补全
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if (str.Length < length)
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{
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StringBuilder sb = new StringBuilder();
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sb.Append(b);
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Random rnd = new Random();
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for (int i = 1; i < length - str.Length; i++)
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{
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sb.Append(r[rnd.Next(binLen)]);
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}
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str += sb.ToString();
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}
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return str;
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}
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}
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}
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