module FFaker::Code

def ean
  ean = rand(100_000_000_000..999_999_999_999).to_s
  sum = 0
  ean.chars.each_with_index { |c, i| sum += c.to_i * (i.odd? ? 3 : 1) }
  nearest_multiple_of_ten = sum.round(-1)
  nearest_multiple_of_ten += 10 if nearest_multiple_of_ten < sum
  "#{ean}#{nearest_multiple_of_ten - sum}"
end