'use strict';

/**
 * Return a unique identifier with the given `len`.
 *
 * @param {Number} length
 * @return {String}
 * @api private
 */
module.exports.getUid = function(length) {
    let uid = '';
    const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const charsLength = chars.length;

    for (let i = 0; i < length; ++i) {
        uid += chars[getRandomInt(0, charsLength - 1)];
    }

    return uid;
};

/**
 * Return a random int, used by `utils.getUid()`.
 *
 * @param {Number} min
 * @param {Number} max
 * @return {Number}
 * @api private
 */
function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min + 1)) + min;
}