public static DateTime CalculateDeadline(DateTime start, TimeSpan workhours)
{
DateTime current = new DateTime(start.Year, start.Month, start.Day, start.Hour, start.Minute, 0);
while (workhours.TotalMinutes > 0)
{
DayOfWeek dayOfWeek = current.DayOfWeek;
Workday workday = Workday.GetWorkday(dayOfWeek);
if (workday == null)
{
DayOfWeek original = dayOfWeek;
while (workday == null)
{
current = current.AddDays(1);
dayOfWeek = current.DayOfWeek;
workday = Workday.GetWorkday(dayOfWeek);
if (dayOfWeek == original)
{
throw new InvalidOperationException("no work days");
}
}
current = current.AddHours(workday.startTime.Hour - current.Hour);
current = current.AddMinutes(workday.startTime.Minute - current.Minute);
}
TimeSpan worked = Workday.WorkHours(workday, current);
if (workhours > worked)
{
workhours = workhours - worked;
// Add one day and reset hour/minutes
current = current.Add(new TimeSpan(1, current.Hour * -1, current.Minute * -1, 0));
}
else
{
current.Add(workhours);
return(current);
}
}
return(DateTime.MinValue);
}