import datetime
import random

from typing import Tuple

from faker.utils.checksums import calculate_luhn

from .. import Provider as SsnProvider


class Provider(SsnProvider):
    @staticmethod
    def _org_to_vat(org_id: str) -> str:
        org_id = org_id.replace("-", "")
        if len(org_id) == 10:
            org_id = "16" + org_id
        return f"SE{org_id}01"

    def ssn(
        self,
        min_age: int = 18,
        max_age: int = 90,
        long: bool = False,
        dash: bool = True,
    ) -> str:
        """
        Returns a 10 or 12 (long=True) digit Swedish SSN, "Personnummer".

        It consists of 10 digits in the form (CC)YYMMDD-SSSQ, where
        YYMMDD is the date of birth, SSS is a serial number
        and Q is a control character (Luhn checksum).

        Specifying dash=False will give a purely numeric string, suitable
        for writing direct to databases.

        http://en.wikipedia.org/wiki/Personal_identity_number_(Sweden)
        """

        age = datetime.timedelta(days=self.generator.random.randrange(min_age * 365, max_age * 365))
        birthday = datetime.datetime.now() - age
        yr_fmt = "%Y" if long else "%y"
        pnr_date = f"{birthday:{yr_fmt}%m%d}"
        chk_date = pnr_date[2:] if long else pnr_date
        suffix = f"{self.generator.random.randrange(0, 999):03}"
        luhn_checksum = str(calculate_luhn(int(chk_date + suffix)))
        hyphen = "-" if dash else ""
        pnr = f"{pnr_date}{hyphen}{suffix}{luhn_checksum}"

        return pnr

    ORG_ID_DIGIT_1 = (1, 2, 3, 5, 6, 7, 8, 9)

    def org_id(self, long: bool = False, dash: bool = True) -> str:
        """
        Returns a 10 or 12 digit Organisation ID for a Swedish
        company.
        (In Swedish) https://sv.wikipedia.org/wiki/Organisationsnummer
        """
        first_digits = list(self.ORG_ID_DIGIT_1)
        random.shuffle(first_digits)
        onr_one = str(first_digits.pop())
        onr_one += str(self.generator.random.randrange(0, 9)).zfill(1)
        onr_one += str(self.generator.random.randrange(20, 99))
        onr_one += str(self.generator.random.randrange(0, 99)).zfill(2)
        onr_two = str(self.generator.random.randrange(0, 999)).zfill(3)
        luhn_checksum = str(calculate_luhn(int(onr_one + onr_two)))
        prefix = "16" if long else ""
        hyphen = "-" if dash else ""

        org_id = f"{prefix}{onr_one}{hyphen}{onr_two}{luhn_checksum}"
        return org_id

    def vat_id(self) -> str:
        """
        http://ec.europa.eu/taxation_customs/vies/faq.html#item_11
        :return: A random Swedish VAT ID, based on a valid Org ID
        """
        oid = self.org_id(long=True, dash=False)
        vid = Provider._org_to_vat(oid)
        return vid

    def org_and_vat_id(self, long: bool = False, dash: bool = True) -> Tuple[str, str]:
        """Returns matching Org ID and VAT number"""
        oid = self.org_id(long=long, dash=dash)
        vid = Provider._org_to_vat(oid)
        return oid, vid