/// <summary>
/// Checks the new override event has a valid date range. It cannot overlap existing override events.
/// </summary>
private bool ValidateNewOverrideEventAgainstExistingOverridingEvents <T>(IProductionEvents <OverrideEvent <T> > existingList, OverrideEventRequestArgument arg)
{
//Test if we override event within the range or we have overlapping overriding
bool noOverlap = true;
//Test if we have overlapping for the start date of the event
//Note closest prior and closest subsequent include event at date itself
var index = existingList.IndexOfClosestEventPriorToDate(arg.EndUTC);
if (index >= 0)
{
existingList.GetStateAtIndex(index, out var startDate, out var evt);
if (startDate != arg.EndUTC) //Ignore exact event time matches
{
noOverlap = arg.StartUTC >= evt.EndDate;
}
}
//Test if we have overlapping for the end date of the event
index = existingList.IndexOfClosestEventSubsequentToDate(arg.StartUTC);
if (index >= 0)
{
existingList.GetStateAtIndex(index, out var startDate, out _);
if (startDate != arg.StartUTC)
{
noOverlap = noOverlap && arg.EndUTC <= startDate;
}
}
return(noOverlap);
}
