using System.Linq;
using System.Text.RegularExpressions;

/// <summary>
///  個資遮罩
///  乎叫方式：MyWeb.Mask.GetPersonalMask("王小明", "*");
/// </summary>
/// 
namespace MyWeb
{
    public class Mask
    {
        public Mask()
        {
           
        }

		static public string GetPersonalMask(string OriStr, string oPrefix)
		{
			return GetPersonalMask(OriStr, oPrefix, true);
		}


		static private string GetPersonalMask(string OriStr, string oPrefix, bool IsDis)
		{
			string oStr = "";
			OriStr = OriStr.Trim();
			char[] oStrArry = OriStr.ToCharArray();
			int[] oArray = new int[] { 0, OriStr.Trim().Length - 1 };

			if (Regex.IsMatch(OriStr.Trim(), @"^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$"))
			{
				oStr += GetPersonalMask(OriStr.Split('@')[0], oPrefix) + "@";

				for (int i = 0; i < OriStr.Split('@')[1].Split('.').Length; i++)
				{
					string oStrL = OriStr.Split('@')[1].Split('.')[i].ToString();
					if (i == 0)
						oStr += GetPersonalMask(oStrL, oPrefix, false);
					else
						oStr += "." + GetPersonalMask(oStrL, oPrefix, false);
				}
				return oStr;
			}
			else if (Regex.IsMatch(OriStr.Trim(), "^(09([0-9]){8})$"))
			{
				oArray = new int[] { 0, 1, 2, 7, 8, 9 };
			}
			else if (Regex.IsMatch(OriStr.Trim(), "^[a-zA-Z][0-9]{9}$"))
			{
				oArray = new int[] { 0, 1, 2, 3, 9 };
			}

			for (int i = 0; i < oStrArry.Length; i++)
			{
				if (IsDis)
					oStr += oArray.Contains(i) ? oStrArry[i].ToString() : oPrefix;
				else
					oStr += oArray.Contains(i) ? oPrefix : oStrArry[i].ToString();
			}
			return oStr;
		}

		

	}
}