using System;

​

public class Stuff

{}

​

public class Program

{

    private string applicationName = "Bank Destroyer[tm]";

    private int sourceNum = 0;

    private int[] nums = { 20, 10, 5, 1 };

    private float transactionFee = 1;

    private int withdrawal = 0;

    private string[] arrayOfNoises = { 

                                       "beep boop!",

                                       "whoopy!",

                                       "Heckus!",

                                       "Blorpo dormp!",

                                       "Goorbly Bloober!!",

                                       "boop!",

                                       "beep!",

                                       "SCRSHZRZSHXHAHXRX",

                                       "ACHAARRHHXXCXHCGH",

                                       "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"

                                     };

    void GetUserInput(string[] args)

    {

        if (args.Length > 0 && Int32.TryParse(args[0], out int resultArgs))

        {

            Console.WriteLine("I see you've already put in a predetermined amount. I'll use that instead!");

            sourceNum = resultArgs;

        }

        else

        {

            Console.Write("Amount::> ");

            if (Int32.TryParse(Console.ReadLine(), out int resultUser))

            {

                sourceNum = resultUser;

            }

            else

            {

                // TODO: Fix Me

                throw new ArithmeticException();

            }

        }

    }

    void WelcomeMessage()

    {

        var message = $@"

Welcome to {applicationName}! We are here to ensure that you never again have to

worry about your savings!

​

How much of your life would you like ruined today?

";

        Console.WriteLine(message);

    }

    string GetBeepBoops()

    {

        var r = new Random();

        return arrayOfNoises[r.Next(arrayOfNoises.Length)];

    }

​

    void CalculateAmount(int idx)

    {

        withdrawal = sourceNum / nums[idx];

        transactionFee += sourceNum * .10f;

        sourceNum -= withdrawal * nums[idx];

    }

    void Pluralizer(int idx)

    {

        if (nums[idx] == 1)

        {

            Console.Write($"Withdrawing {nums[idx]} bill for ");

        }

        else

        {

            Console.Write($"Withdrawing {nums[idx]} bills for ");

        }

    }

    void ThingDo()

    {

        string noise = "";

        Console.WriteLine($"\nYour bank-busting amount is: {sourceNum}");

        for (var idx = 0; idx < nums.Length; idx++)

        {

            Pluralizer(idx); // Simple method to different between 1 or more. E.g., "1 bill," "2 bills," etc

            noise = GetBeepBoops();

            Console.WriteLine($"${nums[idx]}... {noise}");

            CalculateAmount(idx);

        }

            Console.WriteLine($"Transaction fee is ${transactionFee:#####.##} at 10 cents per bill.");

            Console.WriteLine("\n-------------------");

    }

    void Goodbye()

    {

        Console.WriteLine($"Thank you for using {applicationName}! We hope we never see you again!");

    }

    public static void Main(string[] args)

    {

        var p = new Program();

        p.WelcomeMessage();

        p.GetUserInput(args);

        p.ThingDo();

        p.Goodbye();

    }

}