/**
 * 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 ein() {
    // The first two digits are called campus
    // See http://en.wikipedia.org/wiki/Employer_Identification_Number
    // http://www.irs.gov/Businesses/Small-Businesses-&-Self-Employed/How-EINs-are-Assigned-and-Valid-EIN-Prefixes
    const CAMPUS = {
        ANDOVER: ['10', '12'],
        ATLANTA: ['60', '67'],
        AUSTIN: ['50', '53'],
        BROOKHAVEN: [
            '01', '02', '03', '04', '05', '06', '11', '13', '14', '16', '21', '22', '23', '25', '34',
            '51', '52', '54', '55', '56', '57', '58', '59', '65',
        ],
        CINCINNATI: ['30', '32', '35', '36', '37', '38', '61'],
        FRESNO: ['15', '24'],
        INTERNET: ['20', '26', '27', '45', '46', '47'],
        KANSAS_CITY: ['40', '44'],
        MEMPHIS: ['94', '95'],
        OGDEN: ['80', '90'],
        PHILADELPHIA: [
            '33', '39', '41', '42', '43', '48', '62', '63', '64', '66', '68',
            '71', '72', '73', '74', '75', '76', '77',
            '81', '82', '83', '84', '85', '86', '87', '88', '91', '92', '93', '98', '99',
        ],
        SMALL_BUSINESS_ADMINISTRATION: ['31'],
    };

    return {
        /**
         * Validate EIN (Employer Identification Number) which is also known as
         * Federal Employer Identification Number (FEIN) or Federal Tax Identification Number
         */
        validate(input: ValidateInput<ValidateOptions, Localization>): ValidateResult {
            if (input.value === '') {
                return {
                    meta: null,
                    valid: true,
                };
            }

            if (!/^[0-9]{2}-?[0-9]{7}$/.test(input.value)) {
                return {
                    meta: null,
                    valid: false,
                };
            }
            // Check the first two digits
            const campus = `${input.value.substr(0, 2)}`;
            for (const key in CAMPUS) {
                if (CAMPUS[key].indexOf(campus) !== -1) {
                    return {
                        meta: {
                            campus: key,
                        },
                        valid: true,
                    };
                }
            }

            return {
                meta: null,
                valid: false,
            };
        },
    };
}