/// <summary>
/// Returns the nexts scedule from the specified date time
/// </summary>
/// <param name="from">From date time</param>
/// <returns></returns>
DateTime IRecur.Next(DateTime from)
{
DateTime original = from;
while (true)
{
from = Utils.GetValidMonth(_months, from);
///Save the month
int month = from.Month;
///Iterate while the month is same
while (month == from.Month)
{
///if its a valid day return and not same date
if (HasDay(from.Day) && from != original)
{
return(from);
}
///Check the next day
from = from.AddDays(1);
}
//Month changed, so check the last day now, else go for the next valid month
if ((_days & LAST) > 0)
{
return(from.AddDays(-1));
}
}
}
DateTime IRecur.Next(DateTime from)
{
DateTime original = from;
while (true)
{
///Set the valid month
from = Utils.GetValidMonth(_months, from);
//First week
if ((_weeks & Weeks.First) == Weeks.First)
{
while (from.Day < 8)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
//Second week
if ((_weeks & Weeks.Second) == Weeks.Second)
{
while (from.Day < 15 && from.Day > 7)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
//Third week
if ((_weeks & Weeks.Third) == Weeks.Third)
{
while (from.Day < 22 && from.Day > 14)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
//Both Fourth & Last week
if ((_weeks & (Weeks.Fourth | Weeks.Last)) == (Weeks.Fourth | Weeks.Last))
{
while (from.Day > 21)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
else
{
//Fourth week
if ((_weeks & Weeks.Fourth) == Weeks.Fourth)
{
while (from.Day < 29 && from.Day > 21)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
//Last
if ((_weeks & Weeks.Last) == Weeks.Last)
{
int lastWeekDay = GetLastWeekStartDay(from);
while (from.Day >= lastWeekDay)
{
if (Utils.HasWeekday(_weekdays, Utils.GetWeekday(from.DayOfWeek)) &&
from != original)
{
return(from);
}
from = from.AddDays(1);
}
}
}
from = from.AddDays(1);
}
}
