using System;

using System.Collections.Generic;

​

namespace ConsoleApp6

{

    public class BankAccount

    {

        #region Constructors

        public BankAccount(string owner, double balance)

        {

            if (balance < 0) throw new Exception("Cannot create account with negative balance");

            Balance = balance;

            Owner = owner;

​

            AllBankAccounts.Add(this);

        }

        #endregion

​

        #region Methods 

        public void TransferIn(double amount, BankAccount other)

        {

            if (amount < 0) throw new Exception("amount must be positive");

            if (other.Balance < amount) throw new Exception("Insufficient funds in other account");

​

            other.Balance -= amount;

            Balance += amount;

        }

​

        public void TransferOut(double amount, BankAccount other)

        {

​

            if (amount < 0) throw new Exception("amount must be positive");

            if (Balance < amount) throw new Exception("Insufficient funds in your account");

​

            Balance -= amount;

            other.Balance += amount;

        }

​

        public static void ChargeMonthlyFees()

        {

            for (var i = 1; i < AllBankAccounts.Count; i++)

            {

                AllBankAccounts[1].TransferOut(15, AllBankAccounts[0]);

            }

        }

​

        public static void EarnInterest()

        {

            for (var i = 1; i < AllBankAccounts.Count; i++)

            {

                var interest = AllBankAccounts[i].Balance * 0.05;

                AllBankAccounts[i].TransferIn(interest, AllBankAccounts[0]);

            }

        }

​

        public void Print()

        {

            Console.WriteLine( $"{Owner} has ${Balance}");

        }

​

        public static void PrintAllBankAccounts()

        {

            for (var i = 0; i < AllBankAccounts.Count; i++)

            {

                AllBankAccounts[i].Print();

            }

        }

        #endregion

​

        #region Properties 

        public string Owner { get; private set; }

        public double Balance { get; private set; }

​

        public static List<BankAccount> AllBankAccounts { get; } = new List<BankAccount>();

        #endregion

    }

​

    class Program

    {

        static void Main(string[] args)

        {

            var bankAccount = new BankAccount("Bank", 10000000);

            var account1 = new BankAccount("Joe", 100);

            var account2 = new BankAccount("Billy", 200);

​

            BankAccount.PrintAllBankAccounts();

            BankAccount.ChargeMonthlyFees();

            BankAccount.EarnInterest();

            BankAccount.PrintAllBankAccounts();

        }

    }

}