/**
 Class that records the time worked by each of a
 companyÕs employees during one five-day week. 
 A sample application is in the main method.
*/
public class TimeBook
{
    private int numberOfEmployees;
    private int[][] hours;  //hours[i][j] has the hours for employee j on day i.
    private int[] weekHours;//weekHours[i] has the week's hours worked for 
                            //employee i + 1.
    private int[] dayHours; //dayHours[i] has the total hours worked by all
                            //employees on day i. 
	private static final int NUMBER_OF_WORKDAYS = 5;
	private static final int MON = 0;
	private static final int TUE = 1;
	private static final int WED = 2;
	private static final int THU = 3;
	private static final int FRI = 4;

    /**
     Reads hours worked for each employee on each day of the
     work week into the two-dimensional array hours. (The method
     for input is just a stub in this preliminary version.)
     Computes the total weekly hours for each employee and
     the total daily hours for all employees combined.
    */
    public static void main(String[] args)
    {
		private static final int NUMBER_OF_EMPLOYEES = 3;
        TimeBook book = new TimeBook(NUMBER_OF_EMPLOYEES);
        book.setHours( );
        book.update( );
        book.showTable( );
    }
    
    public TimeBook(int theNumberOfEmployees)
    {
        numberOfEmployees = theNumberOfEmployees; 
        hours = new int[NUMBER_OF_WORKDAYS][numberOfEmployees];
        weekHours = new int[numberOfEmployees];
        dayHours = new int[NUMBER_OF_WORKDAYS];
    }

    public void setHours( ) //This is a stub.
    {
        hours[0][0] = 8;  hours[0][1] = 0;  hours[0][2] = 9;
        hours[1][0] = 8;  hours[1][1] = 0;  hours[1][2] = 9;
        hours[2][0] = 8;  hours[2][1] = 8;  hours[2][2] = 8;
        hours[3][0] = 8;  hours[3][1] = 8;  hours[3][2] = 4;
        hours[4][0] = 8;  hours[4][1] = 8;  hours[4][2] = 8;
    }
    
    public void update( )
    {
        computeWeekHours( );
        computeDayHours( );
    }
    
    private void computeWeekHours( )
    {
        for (int employeeNumber = 1; employeeNumber <= numberOfEmployees; employeeNumber++)
        {//Process one employee:
            int sum = 0;
            for (int day = MON; day <= FRI; day++)
                sum = sum + hours[day][employeeNumber - 1];
                //sum contains the sum of all the hours worked in
                //one week by the employee with number employeeNumber.
			weekHours[employeeNumber - 1] = sum;
        }
    }
    
    private void computeDayHours( )
    {
		for (int day = MON; day <= FRI; day++)
        {//Process one day (for all employees):
            int sum = 0; 
            for (int employeeNumber = 1; employeeNumber <= numberOfEmployees;
                     employeeNumber++)
                sum = sum + hours[day][employeeNumber - 1];
                //sum contains the sum of all hours worked by all 
                //employees on one day.
            dayHours[day] = sum; 
        }
    }

    public void showTable( )
    {
		// heading
        System.out.print("Employee  ");
        for (int employeeNumber = 1; employeeNumber <= numberOfEmployees;
                 employeeNumber++)
            System.out.print(employeeNumber + "   ");
        System.out.println("Totals");
        System.out.println( );
		
		// row entries
		for (int day = MON; day <= FRI; day++)
        {
            System.out.print(getDayName(day) + " ");   
            for (int column = 0; column < hours[day].length; column++)
                System.out.print(hours[day][column] + "   ");
            System.out.println(dayHours[day]);
        }
        System.out.println( );
		
        System.out.print("Total  =  "); 
        for (int column = 0; column < numberOfEmployees; column++)
            System.out.print(weekHours[column] + "  ");
        System.out.println( );
    }
    
    //Converts 0 to "Monday", 1 to "Tuesday" etc.
    //Blanks are inserted to make all strings the same length.
	private String getDayName(int day)
    {
        String dayName = null;
        switch (day)
        {
            case MON:
                dayName = "Monday   ";
                break;
            case TUE:
                dayName = "Tuesday  ";
                break;
            case WED: 
                dayName = "Wednesday";
                break;
            case THU:
                dayName = "Thursday ";
                break;
            case FRI:
                dayName = "Friday   ";
                break;
            default:
                System.out.println("Fatal Error.");
                System.exit(0);
                break;
       }
       return dayName;
    }
}