Weight Formatter

weight_formatter.rb

class WeightFormatter
  PROCESSABLE_WEIGHT_UNITS = ["grams", "ounces"]
  
  def self.call(weight_unit, weight)
    unless PROCESSABLE_WEIGHT_TYPES.include?(weight_unit)
      return "#{weight} #{weight_unit}"
    end
    send("process_#{weight_unit.downcase}", weight)
  end
  
  private
    def self.process_grams(weight)
      oz = (weight.to_i * 0.035274).round
      lbs = oz / 16
      ounces = oz % 16
      "#{lbs} lbs. #{ounces} oz."
    end
    
    def self.process_ounces(weight)
      lbs = weight.to_i.round / 16
      ounces = weight.to_i.round % 16
      "#{lbs} lbs. #{ounces} oz."
    end
end