using KSUID;

using System;

​

​

    public static class KsuidExtensions

    {

        private static readonly Random RandomGen = new Random();

​

        /// <summary>

        /// Extension method to Generate Ksuid for supplied DateTime parameter

        /// </summary>

        /// <param name="k"></param>

        /// <param name="dateTime"></param>

        /// <returns>instance of Ksuid object</returns>

        public static Ksuid GenerateForDateTime(this Ksuid k, DateTime dateTime)

        {

            //DateTime dt = DateTime.Now;

            byte[] _payload = new byte[16];

            // TODO: validate dateTime object for UTC kind, allowed date range, etc OR consumer to ensure valid times 

            if (dateTime.Kind == DateTimeKind.Utc)

            {

                // making this thread safe since static variable involved

                lock (RandomGen)

                {

                    RandomGen.NextBytes(_payload);

                }

​

                // calculate offset for the given dateTime parameter in UTC format

                DateTimeOffset dto = new DateTimeOffset(dateTime.ToUniversalTime());

                var _timestamp = Convert.ToUInt32(dto.ToUnixTimeSeconds() - 1400000000);

                return (new Ksuid(_payload, _timestamp));

            }

            else

            {

                throw new ArgumentException("The timestamp is not represented in UTC");

            }

        }

​

        public static string GenerateKSUID(this Ksuid k, string dateTime)

        {

            string ksuidStr = null;

            if (DateTime.TryParse(dateTime, out DateTime entryDateTime))

            {

                DateTime entryUtcDateTime = DateTime.SpecifyKind(entryDateTime, DateTimeKind.Utc);

                ksuidStr = k.GenerateForDateTime(entryUtcDateTime).ToString();

            }

            return ksuidStr;

        }

​

        public static string GenerateKSUID(string dateTime)

        {

            return (new Ksuid()).GenerateKSUID(dateTime);

        }

​

        public static string GenerateKSUID(DateTime dateTime)

        {

            return GenerateKSUID(dateTime.ToString());

        }

​

    }

​