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# frozen_string_literal: true
module FFaker
module BankUS
extend ModuleUtils
extend self
def account_number(min_digits: 9, max_digits: 17)
FFaker.numerify('#' * rand(min_digits..max_digits))
end
def routing_number
partial_routing_number = FFaker.numerify('########')
ninth_digit = generate_ninth_digit(partial_routing_number)
"#{partial_routing_number}#{ninth_digit}"
end
private
def generate_ninth_digit(num_string)
# This leverages the `Modules 10, Straight Summation` used for routing_numbers
# See http://www.sxlist.com/techref/ecommerce/bank/routingnumber/index.htm
# for more details
num_array = num_string.chars.map(&:to_i)
(
(7 * (num_array[0] + num_array[3] + num_array[6])) +
(3 * (num_array[1] + num_array[4] + num_array[7])) +
(9 * (num_array[2] + num_array[5]))
) % 10
end
end
end
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