import java.util.Random;
import java.util.ArrayList;
public class Client
{
	public static void main(String[] args)
	{
		ArrayList<BankAccount> bank = new ArrayList<BankAccount>();
		
		openBank(bank);
		business(bank);
		display(bank);
		billingCycle(bank);
		display(bank);
	}
	
	private static void openBank(ArrayList<BankAccount> bank)
	{
		Random gen = new Random();
		
		int nbrAccts = 17 + gen.nextInt(21);
		for (int k = 1; k <= nbrAccts; k++)
		{
			double amount = 2000.0 + gen.nextInt(6) * 1000;
			
			BankAccount acct;
			if ( gen.nextBoolean() )
				acct = new CheckingAccount(amount);
			else
			{
				acct = new SavingsAccount();
				acct.deposit( amount );
			}
			
			bank.add( acct );
		}
	}	
	
	private static void business(ArrayList<BankAccount> bank)
	{
		Random gen = new Random();
		
		for (BankAccount acct : bank)
		{
			for (int nTran = gen.nextInt(8) ; nTran > 0; nTran--)
			{
				if ( gen.nextBoolean() )
					acct.deposit(500.00);
				else
					acct.withdraw(500.00);
			}	
		}
	}
	
	private static void billingCycle(ArrayList<BankAccount> bank)
	{
		for (BankAccount acct : bank)
			if (acct instanceof SavingsAccount)
				( (SavingsAccount)acct ).addInterest();
			else
				( (CheckingAccount)acct ).applyFees();
	}
	
	private static void display(ArrayList<BankAccount> bank)
	{
		System.out.println();
		for (BankAccount acct : bank)
			System.out.println(acct);	
	}
}