class NotificationsObserver < ActiveRecord::Observer

	observe :session, :code

	def after_save(obj)
		# session changed from active to failed and client side error was reported
		# send notification about broken code
		if obj.is_a?(Session) && obj.code_based?
			if 	obj.state_change == [Session::ACTIVE, Session::FAILED] && 
				obj.error_code == Session::ERROR_CLIENT_SIDE && obj.code.working == false
					ApiMailer.delay.broken_code_alert(obj)
			end
			if obj.state_change == [nil, Session::ACTIVE] && obj.subscription
				ApiMailer.delay.add_codes_alert(obj.code.product)
			end
		end
	rescue 
		nil
	end

	def before_update(obj)
		# code instances after save observer
		if obj.is_a?(Code)
			# check if product related to code has valid duration
			# code is valid if expiration date of the code - now = code product duration
			if obj.expire_date_was == nil && !obj.expire_date.nil?
				# round up durations to hours
				if obj.product.duration.to_i.hours != ((obj.expire_date - Time.now).to_i/1.hour).to_i
					# obj.not_working!(false)
					ApiMailer.delay.invalid_duration_code_alert(obj)
				end
			end
		end
	rescue
		nil
	end

end