using System;

using System.Linq;

using System.IO;

using System.Threading.Tasks;

using System.Diagnostics;

using System.Text;

using System.Security.Cryptography;

using System.Data.HashFunction.CityHash;

using System.Data.HashFunction.FarmHash;

using System.Data.HashFunction.SpookyHash;

using Murmur;

​

public class Program

{   

    //public const string TEST_STRING = "The weather outside is frightful but inside it's so delightful. Subjugating the emengy without fighting is the true pinnacle of excellence";

    public static string TEST_STRING = LoremIpsum.Generate(255);

    public static void Main()

    {

        var stopwatch = new Stopwatch();

        TimeSpan result;

        stopwatch.Start();

        Console.WriteLine("MD5 Hash");

        Console.WriteLine(StringToMd5(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

        stopwatch.Start();

        Console.WriteLine("Md5 Hash to GUID");

        Console.WriteLine(StringToGuid(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

        stopwatch.Start();

        // https://en.wikipedia.org/wiki/MurmurHash

        Console.WriteLine("Murmer Hash3");

        Console.WriteLine(StringToMurmerHash3(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

        stopwatch.Start();

        // https://github.com/google/cityhash

        Console.WriteLine("City Hash");

        Console.WriteLine(StringToCityHash(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

        stopwatch.Start();

        // https://burtleburtle.net/bob/hash/spooky.html

        Console.WriteLine("Spook Hash V2");

        Console.WriteLine(StringToSpookHashV2(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

        stopwatch.Start();

        // https://opensource.googleblog.com/2014/03/introducing-farmhash.html

        Console.WriteLine("Farm Hash 128");

        Console.WriteLine(StringToFarmHash(TEST_STRING));

        stopwatch.Stop();

        result = stopwatch.Elapsed;

        Console.WriteLine(result.TotalMilliseconds.ToString("\n0.000\n"));

        stopwatch.Reset();

    }   

    public static Guid StringToGuid (string text)

    {

        using (var algo = MD5.Create())

        {

            var data = algo.ComputeHash(Encoding.Default.GetBytes(text));

            return new Guid(data);  

        }

    }

    public static string StringToMd5(string text)

    {

        using(var algo = MD5.Create())

            return BitConverter

                .ToString(algo.ComputeHash(Encoding.Default.GetBytes(text)))

                .Replace("-", "")

                .ToLower();

    }

    public static string StringToCityHash(string text)

    {

        var algo = CityHashFactory.Instance.Create();

        return algo

            .ComputeHash(Encoding.Default.GetBytes(text))

            .AsHexString(); 

    }

    public static string StringToSpookHashV2(string text)

    {

        var algo = SpookyHashV2Factory.Instance.Create();

        return algo

            .ComputeHash(Encoding.Default.GetBytes(text))

            .AsHexString();

    }

    public static string StringToFarmHash(string text)

    {

        var algo = FarmHashFingerprint128Factory.Instance.Create();

        return algo

            .ComputeHash(Encoding.Default.GetBytes(text))

            .AsHexString();

    }

    public static string StringToMurmerHash3(string text)

    {

        var algo = MurmurHash.Create128(managed: false);

        return BitConverter

            .ToString(algo.ComputeHash(Encoding.Default.GetBytes(text)))

            .Replace("-", "")

            .ToLower();

    }

    public class LoremIpsum

    {

        public static string Generate(int maxWordCount)

            => _generate(maxWordCount, maxWordCount);

        public static string Generate(int minWordCount, int maxWordCount)

            => _generate(minWordCount, maxWordCount);

        public static string Generate(int minWordCount, int maxWordCount, int maxSentanceCount)

            => _generate(minWordCount, maxWordCount, maxSentanceCount, maxSentanceCount);

        public static string Generate(int minWordCount, int maxWordCount, int minSentanceCount, int maxSentanceCount)

            => _generate(minWordCount, maxWordCount, minSentanceCount, maxSentanceCount);

        public static string Generate(int minWordCount, int maxWordCount, int minSentanceCount, int maxSentanceCount, int maxParagraphCount)

            => _generate(minWordCount, maxWordCount, minSentanceCount, maxSentanceCount, maxParagraphCount, maxParagraphCount);

        public static string Generate(int minWordCount, int maxWordCount, int minSentanceCount, int maxSentanceCount, int minParagraphCount, int maxParagraphCount)

            => _generate(minWordCount, maxWordCount, minSentanceCount, maxSentanceCount, minParagraphCount, maxParagraphCount);

        private static string _generate(int minWordCount, int maxWordCount, int minSentanceCount = 1, int maxSentanceCount = 1, int minParagraphCount = 1, int maxParagraphCount = 1)

        {   

            // Lorem Ipsum passage serialized (https://www.lipsum.com/)

            var source = "lorem,ipsum,dolor,sit,amet,consectetur,adipiscing,elit,sed,do,eiusmod,tempor,incididunt,ut,labore,et,dolore,magna,aliqua,enim,ad,minim,veniam,quis,nostrud,exercitation,ullamco,laboris,nisi,aliquip,ex,ea,commodo,consequat,duis,aute,irure,in,reprehenderit,voluptate,velit,esse,cillum,eu,fugiat,nulla,pariatur,excepteur,sint,occaecat,cupidatat,non,proident,sunt,culpa,qui,officia,deserunt,mollit,anim,id,est,laborum,perspiciatis,unde,omnis,iste,natus,error,voluptatem,accusantium,doloremque,laudantium,totam,rem,aperiam,eaque,ipsa,quae,ab,illo,inventore,veritatis,quasi,architecto,beatae,vitae,dicta,explicabo,nemo,ipsam,quia,voluptas,aspernatur,aut,odit,fugit,consequuntur,magni,dolores,eos,ratione,sequi,nesciunt,neque,porro,quisquam,dolorem,adipisci,numquam,eius,modi,tempora,incidunt,magnam,aliquam,quaerat,minima,nostrum,exercitationem,ullam,corporis,suscipit,laboriosam,aliquid,commodi,consequatur,autem,vel,eum,iure,quam,nihil,molestiae,illum,quo,at,vero,accusamus,iusto,odio,dignissimos,ducimus,blanditiis,praesentium,voluptatum,deleniti,atque,corrupti,quos,quas,molestias,excepturi,occaecati,cupiditate,provident,similique,mollitia,animi,dolorum,fuga,harum,quidem,rerum,facilis,expedita,distinctio,nam,libero,tempore,cum,soluta,nobis,eligendi,optio,cumque,impedit,minus,quod,maxime,placeat,facere,possimus,assumenda,repellendus,temporibus,quibusdam,officiis,debitis,necessitatibus,saepe,eveniet,voluptates,repudiandae,recusandae,itaque,earum,hic,tenetur,a,sapiente,delectus,reiciendis,voluptatibus,maiores,alias,perferendis,doloribus,asperiores,repellat";

​

            var words = source.Split(",");

​

            int wordIndex;

            var temp = new StringBuilder();

​

            var randomNum = new Random();

            var wordCount = randomNum.Next(minWordCount, maxWordCount + 1);

            var sentanceCount = randomNum.Next(minSentanceCount, maxSentanceCount + 1);

            var paragraphCount = randomNum.Next(minParagraphCount, maxParagraphCount + 1);

            for (var x = 0; x <= paragraphCount; x++)

            {

                for (var j = 0; j < sentanceCount; j++)

                {

                    for (var i = 0; i < wordCount; i++)

                    {   

                        wordIndex = randomNum.Next(words.Length);

​

                        // If first word capitalize, if other leave as is.

                        var word = i == 0 

                            ? char.ToUpper(words[wordIndex][0]) + words[wordIndex].Substring(1) 

                            : words[wordIndex];

​

                        temp.Append(word);

​

                        // If final word add period, if other add a space

                        temp.Append(i != wordCount - 1 ? " " : ".");

                    }

​

                    temp.Append(" ");

                }

​

                if (x > 0)

                    temp.AppendLine();

            }

​

            return temp.ToString();

        }   

    }

}