function getCart(callback) {
    var data = null;

    var xhr = new XMLHttpRequest();
    xhr.withCredentials = true;

    xhr.addEventListener("readystatechange", function() {
        if (this.readyState === 4 && this.status == 200) {
            callback(JSON.parse(this.responseText));
        }
        if (this.readyState === 4 && this.status != 200) {
            console.log("Error retrieving cart. Status: " + this.status);
        }
    });

    xhr.open("GET", "/cart.js");
    xhr.send(data);
}

function injectScript() {
    (function(w,d,s,v){var f=d.getElementsByTagName(s)[0],j=d.createElement(s);
        j.async=true;j.src='https://tags.rvere.com/tags/tagmanager.the-book-ultimate-guide.myshopify.com.js?v='+v;f.parentNode.insertBefore(j,f);
    })(window,document,'script','6');
}

function load () {
    if (!Shopify.checkout) {
        getCart(function(cart){
            window.$ShopVariables = window.$ShopVariables || {};
            $ShopVariables.cart = {
                variant_ids: [],
                product_ids: [],
                item_count: cart.item_count,
                total_price: cart.total_price/100,
                items: []
            };
            $ShopVariables.currency = Shopify.currency.active;
            $ShopVariables.email = ""; 

            var items = cart.items;
            for (var i = 0; i < items.length; i++) {
                var item = items[i];
                $ShopVariables.cart.variant_ids.push(item.variant_id);
                $ShopVariables.cart.product_ids.push(item.product_id);
                $ShopVariables.cart.items.push({
                    id: item.variant_id,
                    product_id: item.product_id,
                    title: item.title,
                    product_type: item.product_type,
                    price: item.price/100,
                    quantity: item.quantity
                });
            }
            injectScript();
        });
    } else {
        injectScript();
    }
}

function init () {
    window.Shopify && window.Shopify.loadFeatures && window.Shopify.loadFeatures(
        [
        {
            name: 'consent-tracking-api',
            version: '0.1',
        },
        ]
    );

    var trackingAllowed = !window.Shopify.customerPrivacy || window.Shopify.customerPrivacy.userCanBeTracked();

    if (!trackingAllowed) {
        document.addEventListener('trackingConsentAccepted', function() {
            load();
        });
    } else {
        load();
    }  
}

if (!window.$CivilPixelsLoaded && !window.$ShopVariables) {
    if (document.readyState === 'complete') {
        init();
    } else {
        window.addEventListener("load", init);
    }
}