module Quandl
module Operation
class Sort
  
  class << self
    
    def order?(data)
      return :none if data.blank? || data[0].blank? || data[1].blank?
      data[0][0] > data[1][0] ? :desc : :asc
    end
    
    def order(data, order = :asc)
      # ascending
      case order
      when :asc   then data = sort_asc(data)
      when :desc  then data = sort_desc(data)
      end
      data
    end

    def asc(data)
      data.sort_by{|r| r[0] }
    end
    
    def desc(data)
      data.sort_by{|r| r[0] }.reverse
    end
        
  end

end
end
end