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# frozen_string_literal: true
module FFaker
module IdentificationTW
extend ModuleUtils
extend self
AREA_CODE = { a: 10, b: 11, c: 12, d: 13, e: 14, f: 15, g: 16, h: 17, i: 34, j: 18, k: 19, l: 20, m: 21, n: 22,
o: 35, p: 23, q: 24, r: 25, s: 26, t: 27, u: 28, v: 29, w: 32, x: 30, y: 31, z: 33 }.freeze
# Identity Card Number
# https://en.wikipedia.org/wiki/National_identification_card_(Taiwan)#Identity_card_number
def id
letter = FFaker.letterify('?')
code = AREA_CODE[letter.to_sym]
gender = fetch_sample([1, 2])
serial = FFaker.numerify('#######')
a, b, c, d, e, f, g, h, i, j = "#{code}#{gender}#{serial}".chars.map(&:to_i)
checksum = ((9 * a) + b + (2 * c) + (3 * d) + (4 * e) + (5 * f) + (6 * g) + (7 * h) + (8 * i) + (9 * j)) % 10
"#{letter.upcase}#{gender}#{serial}#{checksum}"
end
end
end
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