french_ssn.rb

require 'date'
require 'yaml'

# 1) define a method #french_ssn_info
def french_ssn_info(ssn_number)
  # 2) write regex to match
    # gender (first digit) => 1 male 2 female
    # year (next 2 digits)
    # month (next 2 digits)
    # department (next 2 digits)
    # random 6 digits
    # last two digits for check
  match_data = ssn_number.match(/(?<gender>[12])\s?(?<year>\d{2})\s?(?<month>0[1-9]|1[0-2])\s?(?<dept>0[1-9]|[1-9]\d)\s?(?<random>\d{3}\s?\d{3})\s?(?<key>\d{2})/)
  # 3) check if ssn is valid ((97 - ssn) % 97) == last 2 digits
  # key = match_data[:key].to_i
  # subtract = ssn_number[0..-3].gsub(/\s/, "").to_i
  # ssn_valid?(ssn_number[0..-3].gsub(/\s/, "").to_i,match_data[:key].to_i)

  # 4) print out a nice string
  if ssn_valid?(ssn_number[0..-3].gsub(/\s/, "").to_i,match_data[:key].to_i)
    # "a man, born in December, 1984 in Seine-Maritime."
    "a #{gender(match_data[:gender])}, born in #{monthname(match_data[:month])}, #{year(match_data[:year])} in #{department(match_data[:dept])}"
  else
    # 5) notify user if invalid
    return "The number is invalid"
  end
end

def ssn_valid?(ssn_without_key, key)
  (97 - ssn_without_key) % 97 == key
end

def gender(code)
  code.to_i == 1 ? "man" : "woman"
end

def year(code)
  "19#{code}"
end

def monthname(code)
  Date::MONTHNAMES[code.to_i]
end

def department(code)
  YAML.load_file("data/french_departments.yml")[code]
end

p french_ssn_info("1 84 12 76 451 089 46")

# p french_ssn_info("1 84")