EmmanuelOga/ffaker

# frozen_string_literal: true

module FFaker
  module IdentificationKR
    extend ModuleUtils
    extend self

    # Resident Registration Number
    # http://ko.wikipedia.org/wiki/%EC%A3%BC%EB%AF%BC%EB%93%B1%EB%A1%9D%EB%B2%88%ED%98%B8
    def rrn
      birth = fetch_sample(::Date.new(1970, 1, 1)..::Date.new(1999, 12, 31)).strftime('%y%d%m')
      sex = fetch_sample([1, 2])
      loc = FFaker.numerify("#{fetch_sample(Array('00'..'95'))}###")
      a, b, c, d, e, f, g, h, i, j, k, l = "#{birth}#{sex}#{loc}".chars.map(&:to_i)
      checksum = (
        11 - (
          (
            (2 * a) + (3 * b) + (4 * c) + (5 * d) + (6 * e) + (7 * f) + (8 * g) + (9 * h) +
              (2 * i) + (3 * j) + (4 * k) + (5 * l)
          ) % 11
        )
      ) % 10
      "#{birth}-#{sex}#{loc}#{checksum}"
    end
  end
end