/// <summary>
/// Simple version: Find the next iteration of a task based upon its TimeInfo.
/// </summary>
/// <param name="Rules">TimeInfo to base checking rules upon.</param>
/// <returns>DateTime of next iteration.</returns>
public static DateTime FindNextIteration(TimeInfo Rules)
{
return(FindNextIteration(DateTime.Now, Rules));
}
/// <summary>
/// Detailed version: Find the next iteration of a task starting from BaseTime based upon its TimeInfo.
/// </summary>
/// <param name="BaseTime">Starting date from which to begin iteration search.</param>
/// <param name="Rules">TimeInfo to base checking rules upon.</param>
/// <returns>DateTime of next iteration.</returns>
public static DateTime FindNextIteration(DateTime BaseTime, TimeInfo Rules)
{
DateTime NextTime = new DateTime();
NextTime = BaseTime;
// set hours/minutes/seconds
NextTime = NextTime - NextTime.TimeOfDay;
NextTime = NextTime + Rules.TimeOfDay;
// SIMPLE RECURRANCE
// Increment from "start date"
if ((Rules.Yearly + Rules.Monthly + Rules.Weekly + Rules.Daily) > 0)
{
NextTime = Rules.Start;
for (int hops = 1; hops <= 3650; ++hops)
{
//Rules.Count = hops;
if (NextTime > BaseTime)
{
return(NextTime);
}
NextTime = NextTime.AddYears(Rules.Yearly);
NextTime = NextTime.AddMonths(Rules.Monthly);
NextTime = NextTime.AddDays(Rules.Weekly * 7);
NextTime = NextTime.AddDays(Rules.Daily);
}
}
// COMPLEX RECURRANCE: Filter month/week/day by flags
// Increment NextTime until we find a day that matches all of our criteria
else if ((Rules.MonthFilter != 0) || (Rules.WeekFilter != 0) || (Rules.DayFilter != 0))
{
for (int hops = 1; hops <= 3650; ++hops) // maximum search of 10 years
{
if ((Rules.MonthFilter & FromMonthToFlag(NextTime.Month)) != 0)
{
// if we're searching for the last week, automatically jump to the last 7 days of the month
bool FindingLastWeek = false;
if ((Rules.WeekFilter & WeekFlag.Last) != 0)
{
if (NextTime.Day >= (DateTime.DaysInMonth(NextTime.Year, NextTime.Month) - 7))
{
FindingLastWeek = true;
}
}
if (((Rules.WeekFilter & FromWeekToFlag(NextTime.Day)) != 0) || FindingLastWeek)
{
if ((Rules.DayFilter & FromDayToFlag(NextTime.DayOfWeek)) != 0)
{
if (NextTime > BaseTime)
{
if (Rules.SpecificDay != 0)
{
if (NextTime.Day == Rules.SpecificDay)
{
return(NextTime);
}
}
else
{
return(NextTime);
}
}
}
}
}
NextTime = NextTime.AddDays(1);
}
}
// NON-RECURRANCE: Item has no rules that allow it to recur
return(DateTime.MinValue);
}
/// <summary>
/// Simple version: Find the iteration count of a task based upon its TimeInfo.
/// </summary>
/// <param name="Rules">TimeInfo to base checking rules upon.</param>
/// <returns>Integer for the number of iterations found.</returns>
public static int FindIterationCount(TimeInfo Rules)
{
return(FindIterationCount(Rules.Start, DateTime.Now, Rules));
}
