package username.dates;

/**
 * An implementation of dates that stores dates as position within
 * the year.
 *
 * @author Samuel A. Rebelsky
 * @version 1.0 of September 2005
 */
public class DayOfYear
  implements SimpleDate
{
  // +--------+------------------------------------------------------------
  // | Fields |
  // +--------+

  /** The position of the day within the year. */
  int days;

  // +--------------+------------------------------------------------------
  // | Constructors |
  // +--------------+

  /**
   * Create the date "_month _day".
   */
  public DayOfYear(int _month, int _day)
  {
    this.days = 0; 
    for (int month = 0; month < _month; month++) {
      this.days = this.days + DateHelper.daysInMonth(month);
    } // for
    this.days = this.days + _day;
  } // DayOfYear(int,int)

  // +---------+-----------------------------------------------------------
  // | Methods |
  // +---------+

  /**
   * Determine this date's position in the year.  January 1 is the
   * 1st day of the year, December 31st is the 365th day of the year.
   */
  public int dayOfYear() 
  {
    return this.days;
  } // dayOfYear()

  /**
   * Determine the month.  Returns a value between 1 and 12.
   */
  public int month()
  {
    int tmp = this.days;
    int month = 1;
    // Keep checking off months until we reach the correct month
    while (tmp > DateHelper.daysInMonth(month)) {
      tmp = tmp - DateHelper.daysInMonth(month);
      month = month + 1;
    } // while
    return month;
  } // month()

  /**
   * Determine the day within the month.
   */
  public int day() 
  {
    int tmp = this.days;
    int month = 1;
    // Keep checking off months until we reach the correct month
    while (tmp > DateHelper.daysInMonth(month)) {
      tmp = tmp - DateHelper.daysInMonth(month);
      month = month + 1;
    } // while
    return tmp;
  } // day()

  /**
   * Convert to a string of the form MONTH DAY, such as January 10
   * or June 17.
   */
  public String toString()
  {
    int tmp = this.days;
    int month = 1;
    // Keep checking off months until we reach the correct month
    while (tmp > DateHelper.daysInMonth(month)) {
      tmp = tmp - DateHelper.daysInMonth(month);
      month = month + 1;
    } // while
    return DateHelper.nameOfMonth(month) + " " + tmp;
  } // toString()

} // class DayOfYear