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# frozen_string_literal: true
require 'date'
module FFaker
# The Social Security number is a 12-digit number in the format:
# "YYYYDDMM-XXXX'
#
# http://sv.wikipedia.org/wiki/Personnummer_i_Sverige
#
# The 4 last digits (XXXX) are generated based on what region the person are
# born # in, the gender and the last one is a check digit using the luhn
# algorithm.
#
# http://en.wikipedia.org/wiki/Luhn_algorithm
#
# Usage:
# ssn(from: Time.local(1980, 2, 28),
# to: Time.local(2000, 2, 28),
# gender: :male)
#
module SSNSE
extend ModuleUtils
extend self
GENDERS = %w[female male].freeze
def ssn(opts = {})
from = opts[:from] || ::Time.local(1940, 1, 1)
to = opts[:to] || ::Time.now
gender = (opts[:gender] || fetch_sample(GENDERS)).to_s
raise_error_on_bad_arguments(from, to, gender)
generate_ssn(from, to, gender)
end
private
def generate_ssn(from, to, gender)
birth_date = random_birth_time_between(from, to)
birth_date_str = birth_date.strftime('%Y%m%d') # "19800228"
region = random_region_for(gender) # "413"
ssn_without_check_digit = birth_date_str + region # "19800228413"
check_digit = luhn_check(ssn_without_check_digit) # "9"
ssn_without_check_digit + check_digit # "198002284139"
end
def raise_error_on_bad_arguments(from, to, gender)
raise ArgumentError, 'Invalid from argument: from' unless to.is_a? ::Time
raise ArgumentError, 'Invalid from argument: from' unless from.is_a? ::Time
raise ArgumentError, 'Invalid argument: from > to' if from > to
raise ArgumentError, 'Invalid argument: gender' unless GENDERS.include?(gender.to_s)
end
def random_birth_time_between(from = ::Time.local(1940, 1, 1), to = ::Time.now)
::Time.at(from + (rand * (to.to_f - from.to_f)))
end
def random_region_for(gender)
region_number = case gender
when 'female' then random_region_even
when 'male' then random_region_odd
end
three_character_string(region_number)
end
def random_region_even
rand(0..498) * 2
end
def random_region_odd
(rand(0..498) * 2) + 1
end
def three_character_string(number)
format('%03d', number)
end
end
end
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