module WhatDay
	class Client

		def day(date)
			begin
				day_int = date.yesterday.wday
				Date::DAYS_INTO_WEEK.key(day_int).to_s.capitalize
			rescue ArgumentError
				nil
			end
		end

		def method_missing(name, *args, &block)
			if name.to_s =~ /^(beginning||end)_of_[a-z]+_\d+$/i
				date = parse_date_string(name.to_s)
				day date
			else
				super
			end
		end

		private

		def parse_date_string(name)
			methods = name.split("_")
			selector = methods[0].downcase
			month = format_date_string methods[2]
			year = methods[3].to_i
			str = "#{year} #{month}, 1"
			date = Date.parse str
			selector == "end" ? date.to_date.end_of_month : date
		end

		def format_date_string(str)
			str.downcase
		end
	end
end