REP Fitness Stock Notifier

// ==UserScript==
// @name         Rep Fitness Stock Notifier
// @namespace    http://tampermonkey.net/
// @version      0.1
// @description  Notifier for Rep Fitness Stock
// @author       dhillonsh
// @match        https://www.repfitness.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    var browserAlert = function () {
        var oldTitle = document.title;
        var msg = "New!";
        var timeoutId;
        var blink = function() { document.title = document.title == msg ? ' ' : msg; };
        var clear = function() {
            clearInterval(timeoutId);
            document.title = oldTitle;
            window.onmousemove = null;
            timeoutId = null;
        };
        return function () {
            if (!timeoutId) {
                timeoutId = setInterval(blink, 1000);
                window.onmousemove = clear;
            }
        };
    };

    var productNotification = function () {
        console.log("Product available.");
        browserAlert();

        var player = document.createElement('audio');
        player.src = 'https://notificationsounds.com/soundfiles/a86c450b76fb8c371afead6410d55534/file-sounds-1108-slow-spring-board.mp3';
        player.preload = 'auto';
        player.play()

        var xhttp = new XMLHttpRequest();
        xhttp.open("GET", "http://localhost:8080/?title=" + document.title, true);
        xhttp.send();
    };

    var refresh = function() {
        var seconds = 30;
        setTimeout(function() {
            var params = new URLSearchParams(window.location.search);
            var new_url = window.location.href.split('?')[0];
            if(params.get("iteration") === null) {
                new_url = new_url + "?iteration=1";
            } else {
                new_url = new_url + "?iteration=" + (parseInt(params.get("iteration")) + 1);
            }
            window.location.replace(new_url);
        }, seconds * 1000);
    };

    var productIDs = [
        "2316" // AB-5200 Adjustable Bench https://www.repfitness.com/ab-5200-bench
    ];

    productIDs.forEach((productID) => {
        console.log(document.querySelectorAll('[data-product-id="' + productID + '"]'));
        if(document.querySelectorAll('[data-product-id="' + productID + '"]').length === 0) return;

        console.log("Found product on page: " + productID);

        if(document.getElementsByClassName("out-of-stock").length > 0) {
           console.log("Product not available.");

           refresh();
       } else {
            productNotification();
       }
    });

})();