# Code 128 条形码是高密度条形码符号。
# https://en.wikipedia.org/wiki/Code_128
# Code 128 A 条形码 code set: ASCII characters 00 to 95 (0-9, A-Z and control codes), special characters, and FNC 1-4.
# Code 128 B 条形码 code set: ASCII characters 32 to 127 (0-9, A-Z, a-z), special characters, and FNC 1-4.
# Code 128 C 条形码 code set: 00-99 (encodes each two digits with one code) and FNC1.

class Unidom::ArticleNumber::Code128Barcode < ::ActiveRecord::Base

  self.table_name = 'unidom_code_128_barcodes'

  #validates :code, presence: true, length: { is: self.columns_hash['code'].limit  }, uniqueness: true
  validates :code, uniqueness: true
  validates :code, numericality: { only_integer: true }, if: Proc.new { |barcode| 'C'==barcode.code_set_code }

  has_many :markings, class_name: 'Unidom::ArticleNumber::Marking'

  include ::Unidom::Common::ModelExtension

  def weighted_modulo_103_checksum(codes)
    sum = 103
    codes.each_with_index do |char, index| sum += (char.unpack('C').first-32)*(index+1) end
    sum%103
  end


end