se-panfilov/jsvat

import { Country } from '../jsvat';

export const slovenia: Country = {
  name: 'Slovenia',
  codes: ['SI', 'SVN', '705'],
  calcFn: (vat: string): boolean => {
    let total = 0;

    // Extract the next digit and multiply by the counter.
    for (let i = 0; i < 7; i++) {
      total += Number(vat.charAt(i)) * slovenia.rules.multipliers.common[i];
    }

    // Establish check digits using modulus 11
    total = 11 - (total % 11);
    if (total === 10) {
      total = 0;
    }

    // Compare the number with the last character of the VAT number. If it is the
    // same, then it's a valid check digit.
    const expect = Number(vat.slice(7, 8));
    return !!(total !== 11 && total === expect);
  },
  rules: {
    multipliers: {
      common: [8, 7, 6, 5, 4, 3, 2]
    },
    regex: [/^(SI)([1-9]\d{7})$/]
  }
};