using System;

using System.Collections.Generic;

using System.Linq;

​

namespace DataSwappingApp

{

    class Program

    {

        static void Main(string[] args)

        {

            Console.WriteLine("Enter the text to be swapped:");

            string inputText = Console.ReadLine();

​

            Console.WriteLine("Select the type of swapping:");

            Console.WriteLine("1. Record-Level Swapping");

            Console.WriteLine("2. Attribute-Level Swapping");

            Console.WriteLine("3. K-Anonymity");

            Console.WriteLine("4. L-Diversity");

​

            int swapType;

            while (!int.TryParse(Console.ReadLine(), out swapType) || (swapType < 1 || swapType > 4))

            {

                Console.WriteLine("Please enter a valid option (1, 2, 3, or 4):");

            }

​

            string swappedText = string.Empty;

            switch (swapType)

            {

                case 1:

                    swappedText = PerformRecordLevelSwapping(inputText);

                    break;

                case 2:

                    swappedText = PerformAttributeLevelSwapping(inputText);

                    break;

                case 3:

                    int k;

                    Console.WriteLine("Enter the value of k for k-anonymity:");

                    while (!int.TryParse(Console.ReadLine(), out k) || k <= 0)

                    {

                        Console.WriteLine("Please enter a valid value for k (greater than 0):");

                    }

                    swappedText = PerformKAnonymity(inputText, k);

                    break;

                case 4:

                    int l;

                    Console.WriteLine("Enter the value of l for l-diversity:");

                    while (!int.TryParse(Console.ReadLine(), out l) || l <= 0)

                    {

                        Console.WriteLine("Please enter a valid value for l (greater than 0):");

                    }

                    swappedText = PerformLDiversity(inputText, l);

                    break;

            }

​

            Console.WriteLine("Original Text: " + inputText);

            Console.WriteLine("Swapped Text: " + swappedText);

​

            Console.WriteLine("\nPress any key to exit...");

            Console.ReadKey();

        }

​

        static string PerformRecordLevelSwapping(string text)

        {

            char[] characters = text.ToCharArray();

            Random random = new Random();

            for (int i = characters.Length - 1; i > 0; i--)

            {

                int j = random.Next(0, i + 1);

                char temp = characters[i];

                characters[i] = characters[j];

                characters[j] = temp;

            }

            return new string(characters);

        }

​

        static string PerformAttributeLevelSwapping(string text)

        {

            char[] characters = text.ToCharArray();

            Random random = new Random();

            for (int i = 0; i < characters.Length; i++)

            {

                int j = random.Next(0, characters.Length);

                char temp = characters[i];

                characters[i] = characters[j];

                characters[j] = temp;

            }

            return new string(characters);

        }

​

        static string PerformKAnonymity(string text, int k)

        {

            List<string> groups = new List<string>();

            int startIndex = 0;

            while (startIndex < text.Length)

            {

                int length = Math.Min(k, text.Length - startIndex);

                groups.Add(text.Substring(startIndex, length));

                startIndex += length;

            }

​

            Random random = new Random();

            groups = groups.OrderBy(g => random.Next()).ToList();

​

            return string.Join("", groups);

        }

​

        static string PerformLDiversity(string text, int l)

        {

            List<string> equivalenceClasses = new List<string>();

            int startIndex = 0;

            while (startIndex < text.Length)

            {

                int length = Math.Min(l, text.Length - startIndex);

                equivalenceClasses.Add(text.Substring(startIndex, length));

                startIndex += length;

            }

​

            Random random = new Random();

            foreach (var eqClass in equivalenceClasses)

            {

                char[] characters = eqClass.ToCharArray();

                for (int i = 0; i < characters.Length; i++)

                {

                    int j = random.Next(0, characters.Length);

                    char temp = characters[i];

                    characters[i] = characters[j];

                    characters[j] = temp;

                }

                equivalenceClasses[equivalenceClasses.IndexOf(eqClass)] = new string(characters);

            }

​

            return string.Join("", equivalenceClasses);

        }

    }

}

​