require "csv"

class PLU
  def initialize(number)
    @number = number.to_s
  end

  def valid?
    /\A[89]?[34]\d{3}\z/.match(@number)
  end

  def name
    self.class.all[base]
  end

  def organic?
    modifier == "9"
  end

  def gm?
    modifier == "8"
  end

  def retailer_assigned?
    name.to_s.start_with?("Retailer Assigned")
  end

  # TODO more items
  def self.all
    @all ||= begin
      all = {}
      CSV.foreach File.expand_path("../../plu_codes.csv", __FILE__), headers: true do |row|
        all[row["PLU Code"]] = row["Name"]
      end
      all
    end
  end

  protected

  def base
    @number[-4..-1]
  end

  def modifier
    @number[-5]
  end
end