//OneWayNoRepeatList.java

/**
 * Class that records the time worked by each of a
 * company's 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)
    {
        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;
    }
}