module DateFinderConditions
  def day_number(day_number)
    condition(:day_number) { |date| date.day == day_number }
  end
  
  def day(day)
    day = case day
      when Fixnum
        day
      
      when String, Symbol
        Date::Format::DAYS[day.to_s.downcase]
    end
    
    condition(:day) { |date| date.wday == day }
  end
  
  Date::Format::DAYS.each do |name, index|
    class_eval <<-END
      def #{name}(boolean)
        day(#{index}) if boolean
      end
    END
  end
  
  def weekday
    condition(:weekday) { |date| date.weekday? }
  end
  
  def month(month)
    month = case month
      when Fixnum:         month
      when String, Symbol: Date::Format::MONTHS[month.to_s.downcase]
    end
    
    condition(:month) { |date| date.month == month }
  end
  
  def day_occurrence(occurrence)
    condition(:day_occurrence) { |date| date.occurrence_in_month?(occurrence) }
  end
  
  def method_missing(method_id, *args)
    method_name = method_id.to_s
    singular = method_name.singularize
    
    if singular != method_name and respond_to?(singular)
      args.each { |arg| send(singular, arg) }
      self
    else
      super
    end
  end
end