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# nifp.py - functions for handling Guinea NIFp numbers
# coding: utf-8
#
# Copyright (C) 2023 Leandro Regueiro
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
# 02110-1301 USA
"""NIFp (Numéro d'Identification Fiscale Permanent, Guinea tax number).
This number consists of 9 digits, usually separated into three groups using
hyphens to make it easier to read. The first eight digits are assigned in a
pseudorandom manner. The last digit is the check digit.
More information:
* https://dgi.gov.gn/wp-content/uploads/2022/09/N%C2%B0-12-Cahier-de-Charges-NIF-p.pdf
>>> validate('693770885')
'693770885'
>>> validate('693-770-885')
'693770885'
>>> validate('12345')
Traceback (most recent call last):
...
InvalidLength: ...
>>> validate('693770880')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> format('693770885')
'693-770-885'
"""
from stdnum import luhn
from stdnum.exceptions import *
from stdnum.util import clean, isdigits
def compact(number):
"""Convert the number to the minimal representation.
This strips the number of any valid separators and removes surrounding
whitespace.
"""
return clean(number, ' -').strip()
def validate(number):
"""Check if the number is a valid Guinea NIFp number.
This checks the length, formatting and check digit.
"""
number = compact(number)
if len(number) != 9:
raise InvalidLength()
if not isdigits(number):
raise InvalidFormat()
luhn.validate(number)
return number
def is_valid(number):
"""Check if the number is a valid Guinea NIFp number."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return '-'.join([number[:3], number[3:-3], number[-3:]])
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