/// <summary>
/// For a monthly repeatable reminder that is scheduled in the past finds the moment of its first occurence in the future.
/// </summary>
protected virtual DateTime GetNextOccurenceOfMonthlyRepeatingReminder(DateTime scheduledTimeInThePast, DateTime now)
{
TimeSpan intervalFromMonthStartUntilNow = new TimeSpan(now.Day, 0, 0, 0) + now.TimeOfDay;
TimeSpan intervalFromMonthStartUntilRingingTime = new TimeSpan(scheduledTimeInThePast.Day, 0, 0, 0) + scheduledTimeInThePast.TimeOfDay;
bool isNextOccurenceInThisMonth = intervalFromMonthStartUntilRingingTime > intervalFromMonthStartUntilNow;
bool isNextOccurenceInFollowingYear = !isNextOccurenceInThisMonth && now.Month == 12;
int yearOfNextOccurence = isNextOccurenceInFollowingYear ? now.Year + 1 : now.Year;
int monthOfNextOccurence = isNextOccurenceInThisMonth ? now.Month : DateTimeArithmeticHelper.MonthModulo(now.Month + 1);
DateTime nextMonthlyOccurenceDate = new DateTime(yearOfNextOccurence, monthOfNextOccurence, scheduledTimeInThePast.Day);
DateTime nextMonthlyOccurenceDateTime = nextMonthlyOccurenceDate + scheduledTimeInThePast.TimeOfDay;
return(nextMonthlyOccurenceDateTime);
}
/// <summary>
/// For a weekly repeatable reminder that is scheduled in the past, finds the moment of its first occurence in the future.
/// </summary>
protected virtual DateTime GetNextOccurenceOfWeeklyRepeatingReminder(DateTime scheduledTimeInThePast, DateTime now, bool[] repeatWeeklyDays)
{
TimeSpan oneDayTimeSpan = new TimeSpan(1, 0, 0, 0);
DateTime dateToday = now.Date;
//First check if it is ok to run today.
//Example: reminder last rang 10 days ago because of service/computer not used. NOW is Monday, 1am, and reminder is set for every working day at 7am. Probably not true, if this is non-dissmised remidner it should maybe ring now (maybe not). If it is dismissed we already scheduled a new time that is not too old.
DateTime nextRingDate = dateToday;
//check if TimeOfDay for ringing already passed today
bool reminderCantRingTodayAnyMore = now.TimeOfDay >= scheduledTimeInThePast.TimeOfDay;
//If remidner can't ring today, start checking from tommorow. In worst case it will ring this same day of week, but in 7 days.
//If it rang today as a late ringing, but scheduledTimeInThePast is long ago, we will then ring once more today if schedueld TimeOfDay is after NOW TimeOfDay
if (reminderCantRingTodayAnyMore)
{
nextRingDate += oneDayTimeSpan;
}
for (int i = 0; i < 7; i++)
{
int nextRingDayOfWeek = DateTimeArithmeticHelper.GetDayOfWeekMondayBased(nextRingDate);
bool isOkToRingOnThatDay = repeatWeeklyDays[nextRingDayOfWeek] == true;
if (isOkToRingOnThatDay)
{
break;
}
nextRingDate += oneDayTimeSpan;
}
DateTime nextWeeklyOccurenceDateTime = nextRingDate + scheduledTimeInThePast.TimeOfDay;
return(nextWeeklyOccurenceDateTime);
}
