Fairprice Delivery Slot Refresher UserScript

FairPriceSlotRefresher.js

// ==UserScript==
// @name         FairPrice Delivery Slot Refresher
// @namespace    https://www.reignofcomputer.com/
// @version      1.3
// @description  Refreshes at Cart to find delivery slots and alerts user when one appears
// @author       ReignOfComputer
// @match        https://www.fairprice.com.sg/cart
// @grant        metadata
// ==/UserScript==

var text = document.body.innerHTML || document.body.textContent;

setTimeout(function() {
    if (text.indexOf("Earliest delivery") < 0) {
        console.log("Slots Full");
        document.title = "Refreshing | FairPrice";
        setTimeout(window.location.reload.bind(window.location), 60000); // 1 minute
    } else {
        console.log("Slot Found");
        document.title = "FOUND | FairPrice";

        // Displays a JavaScript pop-up if a slot is found
        // You can keep watch on this by having the tab open in the foreground
        // Or watch for an alert in your tab bar (the page title will also change to "FOUND")
        // If you'd prefer an audio cue, see below
        alert("Slot Found!");

        // Plays Hey Listen, but doesn't always work because of stupid CSP, so might want to use alert instead
        // If you'd like to try your luck with this, comment out the alert() above and uncomment playSound() below
        // playSound();
    }
}, 5000); // Needs to wait for FairPrice to fetch slots

function playSound() {
	return new Promise((resolve) => {
		const audio = new Audio('https://cdn.reignofcomputer.com/dev/hey_listen.mp3');
		audio.onended = resolve;
		audio.play();
	}).then(playSound);
}