import java.util.Random;

public class CustomerProvider implements Runnable {
    private BankInterface theBank;
    private double ratio;
    private static int MAX_TRANSACTION_TIME = 6;
    private volatile boolean exit = false;

    /**
     * Create an instance of CustomerProvider
     * @param bi the bank to which the customers are going
     * @param fratio the ratio to time between customers to the time required for a customer. 
     * A ratio of 2.0 means that, on average 2 customers arrive at the bank for every
     * one customer that can be handled by a single teller.
     */
    public CustomerProvider(BankInterface bi, double fratio)
    {
        theBank=bi;
        ratio = fratio;
    }

    public void startCustomerFlow()
    {
        Thread t1 = new Thread(this);
        t1.start();
    }

    public void stopCustomers()
    {
        exit=true;
    }

    @Override
    public void run()
    {
        Random r = new Random();
        while (!exit)
        {
            double delay = (r.nextInt((MAX_TRANSACTION_TIME-1))+1) / ratio;
            int ptime = r.nextInt(MAX_TRANSACTION_TIME-1)+1;
            theBank.enteringCustomer(new Customer(ptime));
            try { Thread.sleep(((int)delay)*100); } catch (Exception ee) {}
        }
    }
}