using System;

using System.Collections.Generic;

using System.Linq;

​

public class LicenseKeyFormatter

{

    // Method to format license key

    public string FormatLicenseKey(string input)

    {

        // Step 1: Clean the input (remove invalid characters if needed)

        input = CleanInput(input);

​

        // Step 2: Check the time of day and adjust formatting (this can vary based on real-time clock logic)

        string formattedKey = AdjustForTimeOfDay(input);

​

        // Step 3: Determine the separator type based on digits

        char separator = DetermineSeparator(input);

​

        // Step 4: Handle vowels and case conversion (rules based on vowel presence)

        formattedKey = AdjustCaseBasedOnVowels(formattedKey);

​

        // Step 5: Split the key into sections based on the number of unique characters

        int sectionLength = DetermineSectionLength(formattedKey);

        formattedKey = SplitIntoSections(formattedKey, sectionLength, separator);

​

        // Step 6: Reverse sections if needed (based on additional complex conditions)

        formattedKey = ReverseSectionsIfNeeded(formattedKey);

​

        return formattedKey;

    }

​

    // Step 1: Clean input (remove invalid characters like spaces, symbols, etc.)

    private string CleanInput(string input)

    {

        return new string(input.Where(c => char.IsLetterOrDigit(c) || c == '-' || c == '_' || c == ' ').ToArray());

    }

​

    // Step 2: Adjust formatting based on the time of day (pseudo-logic)

    private string AdjustForTimeOfDay(string input)

    {

        var hour = DateTime.Now.Hour;

        if (hour < 12)

        {

            // For example, lowercase if before noon

            return input.ToLower();

        }

        else

        {

            // For example, uppercase if after noon

            return input.ToUpper();

        }

    }

​

    // Step 3: Determine separator based on presence of digits

    private char DetermineSeparator(string input)

    {

        if (input.Any(char.IsDigit)) 

        {

            return '-'; // Use hyphen for digits

        }

        return '_'; // Use underscore for non-digit characters

    }

​

    // Step 4: Adjust case based on vowel presence (if vowel is present, change case)

    private string AdjustCaseBasedOnVowels(string input)

    {

        string vowels = "aeiouAEIOU";

        return new string(input.Select(c =>

            vowels.Contains(c) ? char.ToUpper(c) : char.ToLower(c)).ToArray());

    }

​

    // Step 5: Split the key into sections based on the number of unique characters

    private int DetermineSectionLength(string input)

    {

        var uniqueChars = input.Distinct().ToList();

        return Math.Min(uniqueChars.Count, 4); // section length based on number of unique characters (capped at 4)

    }

​

    // Step 6: Split into sections

    private string SplitIntoSections(string input, int sectionLength, char separator)

    {

        var sections = new List<string>();

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

        {

            string section = input.Substring(i, Math.Min(sectionLength, input.Length - i));

            sections.Add(section);

        }

        return string.Join(separator.ToString(), sections);

    }

​

    // Step 7: Reverse sections under certain conditions (for example, based on time or a specific character)

    private string ReverseSectionsIfNeeded(string formattedKey)

    {

        // Add a condition to reverse the sections (e.g., based on time or a specific character)

        if (DateTime.Now.Second % 2 == 0) // Just a random condition for the example

        {

            var sections = formattedKey.Split('-').ToList();

            sections.Reverse();

            return string.Join("-", sections);

        }

        return formattedKey;

    }

​

    // Main method to allow dynamic user input

    public static void Main(string[] args)

    {

        // Create instance of LicenseKeyFormatter

        var formatter = new LicenseKeyFormatter();

​

        // Ask the user for a license key

        Console.WriteLine("Please enter the license key:");

​

        // Read user input

        string input = Console.ReadLine();

​

        // Format the input license key

        string formattedKey = formatter.FormatLicenseKey(input);

​

        // Output the formatted license key

        Console.WriteLine("\nFormatted License Key:");

        Console.WriteLine(formattedKey);

    }

}

​