require "my_age/helper"

module MyAge
	module Calculator

		unless respond_to?(:dob)
			def self.included(base)
				def base.my_dob(col)
					define_method(:dob) { send col }
				end
			end
		end

		def age(date=Date.today)
			return 0 if dob.blank? || date.blank? || date <= dob
			(date_to_int(date) - date_to_int(dob))/10_000
		end

		def method_missing(name, *args)
			if name.to_s =~ /_as_of_/
				date_method = name.to_s.split("_as_of_")[-1]
				age today.send(date_method.to_sym, *args)
			else
				super
			end
		end

		private
		def date_to_int(date)
			date.strftime("%Y%m%d").to_i 
		end

		def today
			Date.today
		end
	end
end