import java.util.*;

import java.io.*;

public class CarWashTester
{
	protected CarWash carWash;

	/**
	 *  Initializes this CarWashTester object.
	 *
	 */
	public CarWashTester ()
    	{
        	carWash = new CarWash();
   	} // default constructor


	/**
	 *  Reads in all of the arrival times, runs the simulation, and calculates the average 
	 *  waiting time.
	 *
	 */ 
	public void readAndProcessArrivalTimes()
    	{
		final int SENTINEL = 999;

         	final String PROMPT = "\nPlease enter the next arrival time. The sentinel is " 
					+ Integer.toString (SENTINEL) + ": ";
         		

         	final String OUT_OF_RANGE = "   The input must consist of a non-" +
                                      "negative integer less than the sentinel.";

         	BufferedReader keyboardReader = new BufferedReader
                                         (new InputStreamReader (System.in));

         	String line;

         	int nextArrivalTime;

         	while (true)
         	{
        	     	System.out.print (PROMPT);
             		try
             		{
                 		line = keyboardReader.readLine();
                 		nextArrivalTime = Integer.parseInt (line);
				if (nextArrivalTime == SENTINEL)
                     			break;
                 		if (nextArrivalTime < 0 || nextArrivalTime > SENTINEL)
                     			System.out.println (OUT_OF_RANGE);
                 		else
                 			carWash.process (nextArrivalTime);
             		} // try
             		catch (IOException e)
             		{
                 		System.out.println(e);
             		} // catch IOException             		
             		catch (IllegalArgumentException e)
             		{
                 		System.out.println (e);
             		} // catch IllegalArgumentException
         	} // while
         	carWash.finishUp();
    	} // readAndProcessArrivalTimes


	/**
	 *  Prints the results of the simulation.
	 *
	 */
	public void printResults()
    	{
        	final String RESULTS_HEADING =
            		"\nHere are the results of the simulation:\n";

        	LinkedList<String> results = carWash.getResults();
        	System.out.println (RESULTS_HEADING);
		for (String s : results)
			System.out.print (s);
    	} // method printResults

} // class CarWashTester