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


namespace System
{
    public class QuotedString
    {
        public static string ToQuotedString(string[] vs)
        {
            if (vs == null || vs.Length == 0) return null;

            return ToQuotedDelimitedList(vs);
        }

        public static string ToQuotedString(int[] vs)
        {
            if (vs == null || vs.Length == 0) return null;

            return ToQuotedDelimitedList(vs.Select(x => x.ToString()).ToArray()); ;
        }

        public const char DELIMITER_CHAR = ',';
        /// <summary>
        /// 字符串安全转数组,分隔符','
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static string[] DelimiteredListToArray(string t)
        {
            return DelimiteredListToArray(t, DELIMITER_CHAR);
        }

        public static string[] DelimiteredListToArray(string t, char delim)
        {
            if (string.IsNullOrEmpty(t)) return null;
            return t.Split(delim);
        }
        /// <summary>
        /// 字符串安全转数组,分隔符','
        /// </summary>
        /// <param name="t"></param>
        /// <returns></returns>
        public static List<string> DelimiteredListToList(string t)
        {
            return DelimiteredListToList(t, DELIMITER_CHAR);
        }

        public static List<string> DelimiteredListToList(string t, char delim)
        {
            if (string.IsNullOrEmpty(t)) return null;

            List<string> l = new List<string>();
            l.AddRange(DelimiteredListToArray(t, delim));
            return l;
        }


        /// <summary>
        /// 数组变成字符串
        /// </summary>
        /// <param name="s"></param>
        /// <returns></returns>
        public static string ToDelimiteredList(string[] s)
        {
            return ToDelimiteredList(s, DELIMITER_CHAR);
        }

        public static string ToQuotedDelimitedList(string[] s)
        {
            StringBuilder b = new StringBuilder();

            foreach (string t in s)
            {
                if (b.Length > 0) b.Append(DELIMITER_CHAR);
                b.Append('\'' + t + '\'');
            }

            return b.ToString();
        }

        public static string ToDelimiteredList(string[] s, char delim)
        {
            StringBuilder b = new StringBuilder();
            foreach (string t in s)
            {
                b.Append(delim + t);
            }

            string r = b.ToString();
            if (r.StartsWith(delim.ToString())) r = r.Substring(1);

            return r;
        }

        public static string CreateRandomNumber(int NumCount)
        {
            string text = "0,1,2,3,4,5,6,7,8,9";
            string[] array = text.Split(',');
            string text2 = "";
            int num = -1;
            Random random = new Random();
            for (int i = 0; i < NumCount; i++)
            {
                if (num != -1)
                {
                    random = new Random(i * num * (int)DateTime.Now.Ticks);
                }

                int num2 = random.Next(array.Length - 1);
                if (num == num2)
                {
                    return CreateRandomNumber(NumCount);
                }

                num = num2;
                text2 += array[num2];
            }

            return text2;
        }
    }
}