module KirguduBase
	module Concerns::Models::PersonAge
		extend ActiveSupport::Concern

		included do

		end


		def age
			today = DateTime.now.utc.to_date

			bd = if self.respond_to?(:birth_date)
				     self.birth_date.to_date
				 elsif self.respond_to?(:birthdate)
					 self.birthdate.to_date
				 else
					 nil
				 end rescue nil

			bd.nil? ? nil : today.year - bd.year - (bd.change(:year => today.year) > today ? 1 : 0)
		end

		def next_birth_date
			ag = self.age
			if ag
				bd = if self.respond_to?(birth_date)
					     self.birth_date.to_date
					 elsif self.respond_to?(birthdate)
						 self.birthdate.to_date
					 else
						 nil
					 end
				bd.nil? ? nil : bd + (ag+1).years
			else
				nil
			end
		end

		def days_to_next_birth_date
			nbd = self.next_birth_date
			nbd.nil? ? -1 : nbd - DateTime.now.utc.to_date
		end


	end
end