/// <summary>
/// Gets the Parsha/s for the given Jewish date
/// </summary>
/// <param name="date"></param>
/// <param name="inIsrael"></param>
/// <returns></returns>
public static Parsha[] GetSedra(JewishDate date, bool inIsrael)
{
Parsha[] parshaArray;
//If we are between the first day of Sukkos and Simchas Torah, the parsha will always be Vezos Habracha.
if (date.Month == 7 && date.Day >= 15 && date.Day < (inIsrael ? 23 : 24))
{
return(new Parsha[] { ParshaList[53] });
}
Sedra sedraOrder = new Sedra(date.Year, inIsrael);
int absDate = date.AbsoluteDate;
int index;
int weekNum;
/* find the first saturday on or after today's date */
absDate = GetDayOnOrBefore(6, absDate + 6);
weekNum = (absDate - sedraOrder._firstSatInYear) / 7;
if (weekNum >= sedraOrder._sedraNumWeeks)
{
int indexLast = sedraOrder._sedraArray[sedraOrder._sedraNumWeeks - 1];
if (indexLast < 0)
{
/* advance 2 parashiyot ahead after a doubled week */
index = (-indexLast) + 2;
}
else
{
index = indexLast + 1;
}
}
else
{
index = sedraOrder._sedraArray[weekNum];
}
if (index >= 0)
{
parshaArray = new Parsha[] { ParshaList[index] };
}
else
{
int i = -index; /* undouble the parsha */
parshaArray = new Parsha[] { ParshaList[i], ParshaList[i + 1] };
}
return(parshaArray);
}
private Sedra(int year, bool inIsrael)
{
//If the last call is within the same year as this one, we reuse the data.
//If memory is an issue, remove these next few lines
if (_lastSedraCalculated != null && _lastSedraCalculated._year == year && _lastSedraCalculated._inIsrael == inIsrael)
{
this._firstSatInYear = _lastSedraCalculated._firstSatInYear;
this._sedraArray = _lastSedraCalculated._sedraArray;
return;
}
//Save the data in case the next call is for the same year
_lastSedraCalculated = this;
bool longCheshvon = JewishDateCalculations.IsLongCheshvan(year);
bool shortKislev = JewishDateCalculations.IsShortKislev(year);
int roshHashana = JewishDateCalculations.GetAbsoluteFromJewishDate(year, 7, 1);
DayOfWeek roshHashanaDOW = (DayOfWeek)Math.Abs(roshHashana % 7);
YearType yearType;
if (longCheshvon && !shortKislev)
{
yearType = YearType.Complete;
}
else if (!longCheshvon && shortKislev)
{
yearType = YearType.Incomplete;
}
else
{
yearType = YearType.Regular;
}
this._year = year;
this._inIsrael = inIsrael;
/* find and save the first shabbos on or after Rosh Hashana */
this._firstSatInYear = GetDayOnOrBefore(6, roshHashana + 6);
if (!JewishDateCalculations.IsJewishLeapYear(year))
{
switch (roshHashanaDOW)
{
case DayOfWeek.Saturday:
if (yearType == YearType.Incomplete)
{
this._sedraArray = shabbos_short;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = shabbos_long;
}
break;
case DayOfWeek.Monday:
if (yearType == YearType.Incomplete)
{
this._sedraArray = mon_short;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = this._inIsrael ? mon_short : mon_long;
}
break;
case DayOfWeek.Tuesday:
if (yearType == YearType.Regular)
{
this._sedraArray = this._inIsrael ? mon_short : mon_long;
}
break;
case DayOfWeek.Thursday:
if (yearType == YearType.Regular)
{
this._sedraArray = this._inIsrael ? thu_normal_Israel : thu_normal;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = thu_long;
}
break;
default:
throw new Exception("improper sedra year type calculated.");
}
}
else /* leap year */
{
switch (roshHashanaDOW)
{
case DayOfWeek.Saturday:
if (yearType == YearType.Incomplete)
{
this._sedraArray = shabbos_short_leap;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = this._inIsrael ? shabbos_short_leap : shabbos_long_leap;
}
break;
case DayOfWeek.Monday:
if (yearType == YearType.Incomplete)
{
this._sedraArray = this._inIsrael ? mon_short_leap_Israel : mon_short_leap;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = this._inIsrael ? mon_long_leap_Israel : mon_long_leap;
}
break;
case DayOfWeek.Tuesday:
if (yearType == YearType.Regular)
{
this._sedraArray = this._inIsrael ? mon_long_leap_Israel : mon_long_leap;
}
break;
case DayOfWeek.Thursday:
if (yearType == YearType.Incomplete)
{
this._sedraArray = thu_short_leap;
}
else if (yearType == YearType.Complete)
{
this._sedraArray = thu_long_leap;
}
break;
default:
throw new Exception("improper sedra year type calculated.");
}
}
}
