Amazon.com: Check for delivery slots for Fresh and Whole Foods

amazon-delivery-slots.js

/*
    Install the "Tab Reloader" Chrome Extension: https://chrome.google.com/webstore/detail/tab-reloader-page-auto-re/dejobinhdiimklegodgbmbifijpppopn?hl=en
    1) Load up your Amazon cart and navigate to schedule screen
    2) Configure "Tab Reloader" for the open amazon tab
    3) Under: "Run the following JavaScript code after each reload", insert the below JS.
    * 
    * First time? 
    * 1) Ensure you have notifications enabled for Amazon.com 
    * 2) Run the code below in the JavaScript console of the amazon page to prompt 'Show Notifications'.

    // Prompt 'Show Notifications' on amazon.com
    Notification.requestPermission().then(function (permission) {
        if (permission === 'denied') { alert('Notifications are disabled: Update in Chrome Preferences'); return }
        if (permission === 'granted') { alert('Notifications are enabled'); return }
        if (permission === 'default') { alert('Reload browser and try again'); return }
    })

    * Change Chrome notifications from: "Banner" to: "Alert". They'll stay on your screen until closed!
    * * * * System Preferences > Notifications > Google Chrome
    * 
    * Ensure your mac is not in DND Mode.
    * 
    * Important: Please do disable the extension after you've receievd an Amazon delivery!!
    * 
    * Caveat: Quick and dirty code as it lives within a chrome extension!
*/

// Using global 'var' so I can throw into console repeatedly, while testing, without "already been declared" errors.
var showUnavailableNotification = false
var nonCheckoutPageMessage = '💡 Go to Checkout Page! 💡'
var availableMessage = '🏁 Slot Available! 🏁'
var availableLimitedMessage = '🏁 Limited Slots Available! 🏁'
var unavailableMessage = '🛑 Slot Unavailable! 🛑'
var availableTitle = 'Amazon Available! 🏁'
var unavailableTitle = 'Amazon Unavailable. 🛑'

function isAmazonAvailable() {
    //let amazonMessage = "No delivery windows available. New windows are released throughout the day."
    if (!isCheckoutPage()) {
        doAmazonNotification('Amazon', nonCheckoutPageMessage)
        return
    }

    if (isNotificationVisible('.ufss-limited-available')) {
        doAmazonNotification(availableTitle, availableLimitedMessage)
        console.log(availableLimitedMessage)
        return
    }

    if (!isNotificationVisible('.ufss-slotselect-unavailable-alert')) {
        doAmazonNotification(availableTitle, availableMessage)
        console.log(availableMessage)
        return
    }

    if (showUnavailableNotification) {
        doAmazonNotification(unavailableTitle, unavailableMessage)
    }
    console.log(unavailableMessage)
}

function isCheckoutPage() {
    return document.querySelector("#checkoutDisplayPage") != null
}

function isNotificationVisible(identifier) {
    let element = document.querySelector(identifier)

    if (element == null) {
        console.log('isNotificationVisible: ' + identifier + ': not found')
        return false
    }
    // window.getComputedStyle(ele).visibility == 'visible'

    var visible = window.getComputedStyle(element).visibility === 'visible'
    console.log('isNotificationVisible: ' + identifier + ': ' + visible)
    return visible
}

function doCheckNotificationPermissions(title, message) {
    if (Notification.permission === 'granted') {
        //console.log('notifications already granted')
        return true;
    }

    Notification.requestPermission().then(function (permission) {
        if (permission === "granted") {
            //console.log('notifications try again')
            doAmazonNotification(title, message)
        }
    });

    return false;
}

function doAmazonNotification(title, message) {
    if (!doCheckNotificationPermissions(title, message)) {
        //console.log('notifications denied')
        return;
    }

    var notification = new Notification(title, {
        icon: 'https://www.amazon.com/favicon.ico',
        tag: 'amzn-availability',
        renotify: true,
        requireInteraction: true,
        silent: false,
        body: message
    });
}

isAmazonAvailable()