import java.io.IOException;
import java.util.Scanner;

/**
   A text-based simulation of an automatic teller machine.
*/
public class ATMSimulator
{  
   public static void main(String[] args)
   {  
      ATM theATM;
      try
      {  
         Bank theBank = new Bank();
         theBank.readCustomers("customers.txt");
         theATM = new ATM(theBank);
      }
      catch(IOException e)
      {  
         System.out.println("Error opening accounts file.");
         return;
      }

      Scanner in = new Scanner(System.in);

      while (true)
      {
         int state = theATM.getState();
         if (state == ATM.START)
         {
            System.out.print("Enter customer number: ");
            int number = in.nextInt();
            theATM.setCustomerNumber(number);            
         }
         else if (state == ATM.PIN)
         {
            System.out.print("Enter PIN: ");
            int pin = in.nextInt();
            theATM.selectCustomer(pin);
         }
         else if (state == ATM.ACCOUNT)
         {
            System.out.print("A=Checking, B=Savings, C=Quit: ");
            String command = in.next();
            if (command.equalsIgnoreCase("A"))
            {
               theATM.selectAccount(ATM.CHECKING);
            }
            else if (command.equalsIgnoreCase("B"))
            {
               theATM.selectAccount(ATM.SAVINGS);
            }
            else if (command.equalsIgnoreCase("C"))
            {
               theATM.reset();
            }
            else
            {
               System.out.println("Illegal input!");                        
            }
         }
         else if (state == ATM.TRANSACT)
         {
            System.out.println("Balance=" + theATM.getBalance());
            System.out.print("A=Deposit, B=Withdrawal, C=Cancel: ");
            String command = in.next();
            if (command.equalsIgnoreCase("A"))
            {
               System.out.print("Amount: ");
               double amount = in.nextDouble();
               theATM.deposit(amount);
               theATM.back();
            }
            else if (command.equalsIgnoreCase("B"))
            {
               System.out.print("Amount: ");
               double amount = in.nextDouble();
               theATM.withdraw(amount);
               theATM.back();
            }
            else if (command.equalsIgnoreCase("C"))
            {
               theATM.back();
            }
            else
            {
               System.out.println("Illegal input!");                                    
            }
         }         
      }
   }
}