class Periodic

def initialize(seconds, minutes, hours, weekday, monthday, month, flags = Flags.new)
	super(flags)
	
	@seconds = seconds
	@minutes = minutes
	@hours = hours
	@weekday = weekday
	@monthday = monthday
	@month = month
end

def increment(time = nil)
	time = Time.from(time) || Time.now
	
	units = [@seconds, @minutes, @hours, @weekday, @monthday, @month]
	index = 1
	
	# Step the smallest unit first:
	units[0].increment(time)
	
	# Now try to fit the rest of the schedule:
	while index < units.length
		unit = units[index]
		
		# puts "Checking #{unit} at #{index}... -> #{time}"
		
		# If the unit is not already at the desired time, increment it:
		unless unit.include?(time)
			# puts "Incrementing #{unit} at #{index}..."
			unit.increment(time)
			# puts "-> #{time}"
			
			# Reset all smaller units:
			units[0...index].each do |unit|
				# puts "Resetting #{unit}..."
				unit.reset(time)
			end
		end
		
		index += 1
	end
	
	return time.normalize!
end