using System;
using System.Collections.Generic;

/// <summary>
/// 36进制换算
/// </summary>
public class Scale36
{
    /// <summary>
    /// 进制符号字符串
    /// </summary>
    private static string scString = "0123456789ABCDEFGHJKLMNPQRSTUVWXYZ";

    /// <summary>
    /// 字符集，可以根据编号索引拿到字符
    /// </summary>
    private static char[] scArray = scString.ToCharArray();

    /// <summary>
    /// 字符字典，可以根据字符拿到编号索引
    /// </summary>
    private static Dictionary<char, int> scDic = ToCharDic();

    /// <summary>
    /// 根据字符串反馈进制数
    /// </summary>
    public static int Len { get { return scString.Length; } }

    /// <summary>
    /// 将字符串处理成字符字典
    /// </summary>
    private static Dictionary<char, int> ToCharDic()
    {
        Dictionary<char, int> dic = new Dictionary<char, int>();
        for (int i = 0; i < scArray.Length; i++)
        {
            dic.Add(scArray[i], i);
        }
        return dic;
    }

    /// <summary>
    /// 根据传入的字符符号定义进制，字符符号不能重复，模拟十进制字符串为：0123456789
    /// </summary>
    public static void SetScale(string scaleString)
    {
        scString = scaleString;
        scArray = scString.ToCharArray();
        scDic = ToCharDic();
    }

    /// <summary>
    /// 将Int64转成当前进制字符串
    /// </summary>
    public static string ToCurr36(long num)
    {
        string curr = "";
        while (num >= Len)
        {
            curr = scArray[num % Len] + curr;
            num = num / Len;
        }
        curr = scArray[num] + curr;
        return curr;
    }

    /// <summary>
    /// 将当前进制字符串转成Int
    /// </summary>
    public static long ToInt(string curr)
    {
        double num = 0;
        for (int i = 0; i < curr.Length; i++)
        {
            num += scDic[curr[i]] * Math.Pow(Len, curr.Length - 1 - i);
        }
        return Convert.ToInt32(num);
    }
}