/**
 * 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 interface StringCaseOptions extends ValidateOptions {
    // Can be 'lower' (default) or 'upper'
    case: string;
}
export interface StringCaseLocalization extends Localization {
    stringCase: {
        default: string,
        upper: string,
    };
}

export default function stringCase() {
    return {
        /**
         * Check if a string is a lower or upper case one
         */
        validate(input: ValidateInput<StringCaseOptions, StringCaseLocalization>): ValidateResult {
            if (input.value === '') {
                return { valid: true };
            }

            const opts = Object.assign({}, { case: 'lower' }, input.options);
            const caseOpt = (opts.case || 'lower').toLowerCase();
            return {
                message: opts.message || (input.l10n
                    ? (('upper' === caseOpt) ? input.l10n.stringCase.upper : input.l10n.stringCase.default)
                    : opts.message),
                valid: ('upper' === caseOpt)
                    ? input.value === input.value.toUpperCase()
                    : input.value === input.value.toLowerCase(),
            };
        },
    };
}