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

import { Localization, ValidateInput, ValidateOptions, ValidateResult } from '../core/Core';

export default function isin() {
    // Available country codes
    // See http://isin.net/country-codes/
    const COUNTRY_CODES = 'AF|AX|AL|DZ|AS|AD|AO|AI|AQ|AG|AR|AM|AW|AU|AT|AZ|BS|BH|BD|BB|BY|BE|BZ|BJ|BM|BT|BO|BQ|BA|BW|' +
        'BV|BR|IO|BN|BG|BF|BI|KH|CM|CA|CV|KY|CF|TD|CL|CN|CX|CC|CO|KM|CG|CD|CK|CR|CI|HR|CU|CW|CY|CZ|DK|DJ|DM|DO|EC|EG|' +
        'SV|GQ|ER|EE|ET|FK|FO|FJ|FI|FR|GF|PF|TF|GA|GM|GE|DE|GH|GI|GR|GL|GD|GP|GU|GT|GG|GN|GW|GY|HT|HM|VA|HN|HK|HU|IS|' +
        'IN|ID|IR|IQ|IE|IM|IL|IT|JM|JP|JE|JO|KZ|KE|KI|KP|KR|KW|KG|LA|LV|LB|LS|LR|LY|LI|LT|LU|MO|MK|MG|MW|MY|MV|ML|MT|' +
        'MH|MQ|MR|MU|YT|MX|FM|MD|MC|MN|ME|MS|MA|MZ|MM|NA|NR|NP|NL|NC|NZ|NI|NE|NG|NU|NF|MP|NO|OM|PK|PW|PS|PA|PG|PY|PE|' +
        'PH|PN|PL|PT|PR|QA|RE|RO|RU|RW|BL|SH|KN|LC|MF|PM|VC|WS|SM|ST|SA|SN|RS|SC|SL|SG|SX|SK|SI|SB|SO|ZA|GS|SS|ES|LK|' +
        'SD|SR|SJ|SZ|SE|CH|SY|TW|TJ|TZ|TH|TL|TG|TK|TO|TT|TN|TR|TM|TC|TV|UG|UA|AE|GB|US|UM|UY|UZ|VU|VE|VN|VG|VI|WF|EH|' +
        'YE|ZM|ZW';

    return {
        /**
         * Validate an ISIN (International Securities Identification Number)
         * @see http://en.wikipedia.org/wiki/International_Securities_Identifying_Number
         */
        validate(input: ValidateInput<ValidateOptions, Localization>): ValidateResult {
            if (input.value === '') {
                return { valid: true };
            }

            const v = input.value.toUpperCase();
            const regex = new RegExp('^(' + COUNTRY_CODES + ')[0-9A-Z]{10}$');
            if (!regex.test(input.value)) {
                return { valid: false };
            }

            const length = v.length;
            let converted = '';
            let i;
            // Convert letters to number
            for (i = 0; i < length - 1; i++) {
                const c = v.charCodeAt(i);
                converted += ((c > 57) ? (c - 55).toString() : v.charAt(i));
            }

            let digits = '';
            const n = converted.length;
            const group  = (n % 2 !== 0) ? 0 : 1;
            for (i = 0; i < n; i++) {
                digits += (parseInt(converted[i], 10) * ((i % 2) === group ? 2 : 1) + '');
            }

            let sum = 0;
            for (i = 0; i < digits.length; i++) {
                sum += parseInt(digits.charAt(i), 10);
            }
            sum = (10 - (sum % 10)) % 10;
            return { valid: `${sum}` === v.charAt(length - 1) };
        },
    };
}