/**
 * FormValidation (https://formvalidation.io)
 * The best validation library for JavaScript
 * (c) 2013 - 2020 Nguyen Huu Phuoc <me@phuoc.ng>
 */

/**
 * Validate Slovenian VAT number
 *
 * @returns {ValidateResult}
 */
export default function siVat(value: string) {
    // The Slovenian VAT numbers don't start with zero
    const res = value.match(/^(SI)?([1-9][0-9]{7})$/);
    if (!res) {
        return {
            meta: {},
            valid: false,
        };
    }
    const v = res[1] ? value.substr(2) : value;
    const weight = [8, 7, 6, 5, 4, 3, 2];
    let sum = 0;
    for (let i = 0; i < 7; i++) {
        sum += parseInt(v.charAt(i), 10) * weight[i];
    }
    sum = 11 - sum % 11;
    if (sum === 10) {
        sum = 0;
    }
    return {
        meta: {},
        valid: `${sum}` === v.substr(7, 1),
    };
}