/**
 * Inspired by and credit to is_js [https://github.com/arasatasaygin/is.js]
 */

const regexes = {
    ipv4: /^(?:(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])\.){3}(?:\d|[1-9]\d|1\d{2}|2[0-4]\d|25[0-5])$/,
    ipv6: /^((?=.*::)(?!.*::.+::)(::)?([\dA-F]{1,4}:(:|\b)|){5}|([\dA-F]{1,4}:){6})((([\dA-F]{1,4}((?!\3)::|:\b|$))|(?!\2\3)){2}|(((2[0-4]|1\d|[1-9])?\d|25[0-5])\.?\b){4})$/i,
};

/**
 * Helper function which reverses the sense of predicate result
 * @param {*} func
 * @returns
 */
function not(func) {
    return function () {
        return !func.apply(null, Array.prototype.slice.call(arguments));
    };
}

/**
 * Replaces is.existy from is_js.
 * @param {*} value - The value to test
 * @returns {boolean} True if the value is defined, otherwise false
 */
function existy(value) {
    return value != null;
}

/**
 * Replaces is.ip from is_js.
 * @param {*} value - The value to test
 * @returns {boolean} True if the value is an IP address, otherwise false
 */
function ip(value) {
    return (
        (existy(value) && regexes.ipv4.test(value)) || regexes.ipv6.test(value)
    );
}

/**
 * Replaces is.object from is_js.
 * @param {*} value - The value to test
 * @returns {boolean} True if the value is an object, otherwise false
 */
function object(value) {
    return Object(value) === value;
}

/**
 * Replaces is,.string from is_js.
 * @param {*} value - The value to test
 * @returns True if the value is a string, otherwise false
 */
function string(value) {
    return Object.prototype.toString.call(value) === '[object String]';
}

const is = {
    existy: existy,
    ip: ip,
    object: object,
    string: string,
    not: {
        existy: not(existy),
        ip: not(ip),
        object: not(object),
        string: not(string),
    },
};

module.exports = is;