/**
 * 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 vin() {
    return {
        /**
         * Validate an US VIN (Vehicle Identification Number)
         */
        validate(input: ValidateInput<ValidateOptions, Localization>): ValidateResult {
            if (input.value === '') {
                return { valid: true };
            }

            // Don't accept I, O, Q characters
            if (!/^[a-hj-npr-z0-9]{8}[0-9xX][a-hj-npr-z0-9]{8}$/i.test(input.value)) {
                return { valid: false };
            }

            const v = input.value.toUpperCase();
            const chars = {
                A: 1,   B: 2,   C: 3,   D: 4,   E: 5,   F: 6,   G: 7,   H: 8,
                J: 1,   K: 2,   L: 3,   M: 4,   N: 5,   P: 7,   R: 9,
                S: 2,   T: 3,   U: 4,   V: 5,   W: 6,   X: 7,   Y: 8,   Z: 9,
                0: 0,   1: 1,   2: 2,   3: 3,   4: 4,   5: 5,   6: 6,   7: 7,   8: 8,   9: 9,
            };
            const weights = [8, 7, 6, 5, 4, 3, 2, 10, 0, 9, 8, 7, 6, 5, 4, 3, 2];
            const length = v.length;
            let sum = 0;
            for (let i = 0; i < length; i++) {
                sum += chars[`${v.charAt(i)}`] * weights[i];
            }

            let reminder = `${sum % 11}`;
            if (reminder === '10') {
                reminder = 'X';
            }

            return { valid: reminder === v.charAt(8) };
        },
    };
}