IEnumerable<DateTime> GetScheduledDateTimes(JobSchedule schedule)
{
var scheduledDateTimes = new List<DateTime>();
for (var counter = 0; counter > 0 - schedule.AllowedDelayDays; counter--)
{
ScheduledType type;
if (!TryParse(schedule.JobScheduleType.Type, out type))
continue;
var date = Time.AddDays(counter);
switch (type)
{
case Daily:
scheduledDateTimes.Add(new DateTime(date.Year, date.Month, date.Day, schedule.Hour, schedule.Minute, 0));
break;
case Weekly:
if (DayOfWeekQualifies(schedule, date))
scheduledDateTimes.Add(new DateTime(date.Year, date.Month, date.Day, schedule.Hour, schedule.Minute, 0));
break;
case Monthly:
if (MonthQualifies(schedule, date) && DayQualifies(schedule, date))
scheduledDateTimes.Add(new DateTime(date.Year, date.Month, date.Day, schedule.Hour, schedule.Minute, 0));
break;
case Minutely:
case Hourly:
break;
default:
throw new ArgumentOutOfRangeException();
}
}
return scheduledDateTimes.Where(dateTime => dateTime <= Time)
.ToList();
}
static bool DayQualifies(JobSchedule schedule, DateTime datetime)
{
if (schedule.LastDayOfMonth)
{
var endOfMonth = new DateTime(datetime.Year, datetime.Month, DaysInMonth(datetime.Year, datetime.Month));
if (datetime.Day == endOfMonth.Day)
return true;
}
switch (datetime.Day)
{
case 1:
return schedule.One;
case 2:
return schedule.Two;
case 3:
return schedule.Three;
case 4:
return schedule.Four;
case 5:
return schedule.Five;
case 6:
return schedule.Six;
case 7:
return schedule.Seven;
case 8:
return schedule.Eight;
case 9:
return schedule.Nine;
case 10:
return schedule.Ten;
case 11:
return schedule.Eleven;
case 12:
return schedule.Twelve;
case 13:
return schedule.Thirteen;
case 14:
return schedule.Fourteen;
case 15:
return schedule.Fifteen;
case 16:
return schedule.Sixteen;
case 17:
return schedule.Seventeen;
case 18:
return schedule.Eighteen;
case 19:
return schedule.Nineteen;
case 20:
return schedule.Twenty;
case 21:
return schedule.TwentyOne;
case 22:
return schedule.TwentyTwo;
case 23:
return schedule.TwentyThree;
case 24:
return schedule.TwentyFour;
case 25:
return schedule.TwentyFive;
case 26:
return schedule.TwentySix;
case 27:
return schedule.TwentySeven;
case 28:
return schedule.TwentyEight;
case 29:
return schedule.TwentyNine;
case 30:
return schedule.Thirty;
case 31:
return schedule.ThirtyOne;
default:
return false;
}
}
static bool MonthQualifies(JobSchedule schedule, DateTime datetime)
{
switch (datetime.Month)
{
case 1:
return schedule.January;
case 2:
return schedule.February;
case 3:
return schedule.March;
case 4:
return schedule.April;
case 5:
return schedule.May;
case 6:
return schedule.June;
case 7:
return schedule.July;
case 8:
return schedule.August;
case 9:
return schedule.September;
case 10:
return schedule.October;
case 11:
return schedule.November;
case 12:
return schedule.December;
default:
return false;
}
}
static bool DayOfWeekQualifies(JobSchedule schedule, DateTime datetime)
{
switch (datetime.DayOfWeek)
{
case Sunday:
return schedule.Sunday;
case Monday:
return schedule.Monday;
case Tuesday:
return schedule.Tuesday;
case Wednesday:
return schedule.Wednesday;
case Thursday:
return schedule.Thursday;
case Friday:
return schedule.Friday;
case Saturday:
return schedule.Saturday;
default:
return false;
}
}