package wek3;
import java.util.*;

    /**
     * TicketCounter demonstrates the use of a queue for simulating a line of customers.
     *
     * @author Lewis and Chase
     * @version 4.0
     */
    public class TicketCounter
    {
        private final static int PROCESS = 120;
        private final static int MAX_CASHIERS = 10;
        private final static int NUM_CUSTOMERS = 100;

        public static void main(String[] args)
        {
            Customer customer;
            Queue<Customer> customerQueue = new LinkedList<Customer>();
            int[] cashierTime = new int[MAX_CASHIERS];
            int totalTime, averageTime, departs, start;

            // run the simulation for various number of cashiers
            for (int cashiers = 0; cashiers < MAX_CASHIERS; cashiers++)
            {
                // set each cashiers time to zero initially
                for (int count = 0; count < cashiers; count++) {
                    cashierTime[count] = 0;
                }

                // load customer queue
                for (int count = 1; count <= NUM_CUSTOMERS; count++) {
                    customerQueue.add(new Customer(count * 15));
                }

                totalTime = 0;

                // process all customers in the queue
                while (!(customerQueue.isEmpty()))
                {
                    for (int count = 0; count <= cashiers; count++)
                    {
                        if (!(customerQueue.isEmpty()))
                        {
                            customer = customerQueue.remove();
                            if (customer.getArrivalTime() > cashierTime[count]) {
                                start = customer.getArrivalTime();
                            } else {
                                start = cashierTime[count];
                            }
                            departs = start + PROCESS;
                            customer.setDepartureTime(departs);
                            cashierTime[count] = departs;
                            totalTime += customer.totalTime();
                        }
                    }
                }

                // output results for this simulation
                averageTime = totalTime / NUM_CUSTOMERS;
                System.out.println("Number of cashiers: " + (cashiers + 1));
                System.out.println("Average time: " + averageTime + "\n");
            }
        }
    }