/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

// Fire me up!

module.exports = {
    implements: 'services/utils'
};

/**
 * @returns {UtilsService}
 */
module.exports.factory = () => {
    class UtilsService {
        /**
         * Generate token string.
         *
         * @param len length of string
         * @returns {String} Random string.
         */
        static randomString(len) {
            const possible = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
            const possibleLen = possible.length;

            let res = '';

            for (let i = 0; i < len; i++)
                res += possible.charAt(Math.floor(Math.random() * possibleLen));

            return res;
        }
    }

    return UtilsService;
};