# ncf.py - functions for handling Dominican Republic invoice numbers
# coding: utf-8
#
# Copyright (C) 2017-2018 Arthur de Jong
#
# 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

# Development of this functionality was funded by iterativo | http://iterativo.do

"""NCF (Números de Comprobante Fiscal, Dominican Republic receipt number).

The NCF is used to number invoices and other documents for the purposes of
tax filing. The number is 19 digits long and consists of a letter (A or P) to
indicate that the number was assigned by the taxpayer or the DGIT, followed a
2-digit business unit number, a 3-digit location number, a 3-digit mechanism
identifier, a 2-digit document type and a 8-digit serial number.

More information:

 * https://www.dgii.gov.do/

>>> validate('B0100000005')  # format since 2018-05-01
'B0100000005'
>>> validate('A020010210100000005')  # format before 2018-05-01
'A020010210100000005'
>>> validate('Z0100000005')
Traceback (most recent call last):
    ...
InvalidFormat: ...
"""

from stdnum.exceptions import *
from stdnum.util import clean


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().upper()


# The following document types are known:
#  01 invoices for fiscal declaration (or tax reporting)
#  02 invoices for final consumer
#  03 debit note
#  04 credit note (refunds)
#  11 informal supplier invoices (purchases)
#  12 single income record
#  13 minor expenses invoices (purchases)
#  14 invoices for special customers (tourists, free zones)
#  15 invoices for the government

def validate(number):
    """Check if the number provided is a valid NCF."""
    number = compact(number)
    if len(number) == 11:
        if number[0] != 'B' or not number[1:].isdigit():
            raise InvalidFormat()
    elif len(number) == 19:
        if number[0] not in 'AP' or not number[1:].isdigit():
            raise InvalidFormat()
    else:
        raise InvalidLength()
    if number[-10:-8] not in (
            '01', '02', '03', '04', '11', '12', '13', '14', '15'):
        raise InvalidComponent()
    return number


def is_valid(number):
    """Check if the number provided is a valid NCF."""
    try:
        return bool(validate(number))
    except ValidationError:
        return False


def _convert_result(result):  # pragma: no cover
    """Translate SOAP result entries into dictionaries."""
    translation = {
        'NOMBRE': 'name',
        'COMPROBANTE': 'proof',
        'ES_VALIDO': 'is_valid',
        'MENSAJE_VALIDACION': 'validation_message',
        'RNC': 'rnc',
        'NCF': 'ncf',
        u'RNC/Cédula': 'rnc',
        u'Nombre/Razón Social': 'name',
        'Estado': 'status',
        'Tipo de comprobante': 'type',
    }
    return dict(
        (translation.get(key, key), value)
        for key, value in result.items())


def check_dgii(rnc, ncf, timeout=30):  # pragma: no cover
    """Validate the RNC, NCF combination on using the DGII online web service.

    This uses the validation service run by the the Dirección General de
    Impuestos Internos, the Dominican Republic tax department to check
    whether the combination of RNC and NCF is valid. The timeout is in
    seconds.

    Returns a dict with the following structure::

        {
            'name': 'The registered name',
            'status': 'VIGENTE',
            'type': 'FACTURAS DE CREDITO FISCAL',
            'rnc': '123456789',
            'ncf': 'A020010210100000005',
            'validation_message': 'El NCF digitado es válido.',
        }

    Will return None if the number is invalid or unknown."""
    import requests
    try:
        from bs4 import BeautifulSoup
    except ImportError:
        from BeautifulSoup import BeautifulSoup
    from stdnum.do.rnc import compact as rnc_compact
    rnc = rnc_compact(rnc)
    ncf = compact(ncf)
    url = 'http://www.dgii.gov.do/app/WebApps/ConsultasWeb/consultas/ncf.aspx'
    headers = {
        'User-Agent': 'Mozilla/5.0 (python-stdnum)',
    }
    data = {
        '__EVENTVALIDATION': '/wEWBAKh8pDuCgK+9LSUBQLfnOXIDAKErv7SBhjZB34//pbvvJzrbkFCGGPRElcd',
        '__VIEWSTATE': '/wEPDwUJNTM1NDc0MDQ5ZGRCFUYoDcVRgzEntcKfSuvPnC2VhA==',
        'ctl00$cphMain$btnConsultar': 'Consultar',
        'ctl00$cphMain$txtNCF': ncf,
        'ctl00$cphMain$txtRNC': rnc,
    }
    result = BeautifulSoup(
        requests.post(url, headers=headers, data=data, timeout=timeout).text)
    results = result.find(id='ctl00_cphMain_pResultado')
    if results:
        data = {
            'validation_message': result.find(id='ctl00_cphMain_lblInformacion').get_text().strip(),
        }
        data.update(zip(
            [x.get_text().strip().rstrip(':') for x in results.find_all('strong')],
            [x.get_text().strip() for x in results.find_all('span')]))
        return _convert_result(data)