/**
 * 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 Czech national identification number (RC)
 *
 * @returns {ValidateResult}
 */
export default function czId(value: string) {
    if (!/^\d{9,10}$/.test(value)) {
        return {
            meta: {},
            valid: false,
        };
    }
    let year = 1900 + parseInt(value.substr(0, 2), 10);
    const month = parseInt(value.substr(2, 2), 10) % 50 % 20;
    const day = parseInt(value.substr(4, 2), 10);
    if (value.length === 9) {
        if (year >= 1980) {
            year -= 100;
        }
        if (year > 1953) {
            return {
                meta: {},
                valid: false,
            };
        }
    } else if (year < 1954) {
        year += 100;
    }

    if (!isValidDate(year, month, day)) {
        return {
            meta: {},
            valid: false,
        };
    }

    // Check that the birth date is not in the future
    if (value.length === 10) {
        let check = parseInt(value.substr(0, 9), 10) % 11;
        if (year < 1985) {
            check = check % 10;
        }
        return {
            meta: {},
            valid: `${check}` === value.substr(9, 1),
        };
    }

    return {
        meta: {},
        valid: true,
    };
}
