ssn_infos.rb

require "date"

DPT = {
  "76" => "Seine-Maritime",
  "75" => "Paris"
}

REG_SSN = /^(?<gender>1|2)(?<year>\d{2})(?<month>0[1-9]|1[0-2])(?<zip>\d{2})\d{6}(?<key>\d{2})/

def ssn_info(ssn)
  # TODO: return a string like this
  # The number is valid: a man, born in December, 1984 in Seine-Maritime.
  ssn = ssn.gsub(/\s/, "")

  data = ssn.match(REG_SSN)
  if data.nil?
    return "The number is invalid."
  else
    calcul = 97 - (ssn[0...-2].to_i % 97)
    if calcul == data[:key].to_i
      if data[:gender] == "1"
        gender = "man"
      else
        gender = "woman"
      end
      month = Date::MONTHNAMES[data[:month].to_i]
      return "The number is valid: a #{gender}, born in #{month}, 19#{data[:year]} in #{DPT[data[:zip]]}"
    else
      return "The number is invalid."
    end
  end
end

numbers = [
  "1 84 12 76 451 089 46",
  "2 86 10 75 114 511 75",
  "2 86 10 75 114 511 74",
  "123"
]

numbers.each do |number|
  puts ssn_info(number)
end