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

import isValidDate from '../../utils/isValidDate';

/**
 * Validate Lithuanian Personal Code (Asmens kodas)
 *
 * @see http://en.wikipedia.org/wiki/National_identification_number#Lithuania
 * @see http://www.adomas.org/midi2007/pcode.html
 * @returns {ValidateResult}
 */
export default function ltId(value: string) {
    if (!/^[0-9]{11}$/.test(value)) {
        return {
            meta: {},
            valid: false,
        };
    }
    const gender = parseInt(value.charAt(0), 10);
    let year = parseInt(value.substr(1, 2), 10);
    const month = parseInt(value.substr(3, 2), 10);
    const day = parseInt(value.substr(5, 2), 10);
    const century = (gender % 2 === 0) ? (17 + gender / 2) : (17 + (gender + 1) / 2);
    year = century * 100 + year;
    if (!isValidDate(year, month, day, true)) {
        return {
            meta: {},
            valid: false,
        };
    }

    // Validate the check digit
    let weight = [1, 2, 3, 4, 5, 6, 7, 8, 9, 1];
    let sum = 0;
    let i;
    for (i = 0; i < 10; i++) {
        sum += parseInt(value.charAt(i), 10) * weight[i];
    }
    sum = sum % 11;
    if (sum !== 10) {
        return {
            meta: {},
            valid: `${sum}` === value.charAt(10),
        };
    }

    // Re-calculate the check digit
    sum = 0;
    weight = [3, 4, 5, 6, 7, 8, 9, 1, 2, 3];
    for (i = 0; i < 10; i++) {
        sum += parseInt(value.charAt(i), 10) * weight[i];
    }
    sum = sum % 11;
    if (sum === 10) {
        sum = 0;
    }
    return {
        meta: {},
        valid: `${sum}` === value.charAt(10),
    };
}