Attach in basket

/*

    Check for presence of computing promo blocks (hidden by default)

    Check the cookie and search through SKUs to see if any anti-virus or MS office are in basket

    If no MS office display add to basket block and initiliase add to basket 
    or if MS office show added to basket block

    If no antivirus display add to basket block and initiliase add to basket
    or if no antivirus show added to basket block 

*/

var computingAttachmentSkus = {
    office : [],
    av : []
};

function cachedBasketPromos() {
    var promos = Array.from(document.querySelectorAll('.productServicepromotion'));
    return () => promos;
}

var getBasketPromos = cachedBasketPromos();

function getComputingPromos(promos) {
    return promos.filter(promo => promo.hasAttribute('data-computing-promo'));
}

function getOfficePromos(promos) {
    return promos.filter(promo => promo.hasAttribute('data-computing-promo-office'));
}

function getAVPromos(promos) {
    return promos.filter(promo => promo.hasAttribute('data-computing-promo-av'));
}

function checkForComputingAttachmentsInBasket(basketData) {

    var skusInBasket = basketData.CommaSeparatedListOfProductSkus.split(',');
    var skus = window.computingAttachmentSkusOverrides || computingAttachmentSkus;
    var skusFound = {
        office : skusInBasket.filter(sku => skus.office.indexOf(sku) > -1),
        av : skusInBasket.filter(sku => skus.av.indexOf(sku) > -1)
    };
    return skusFound;

}

function getPromoStates() {

    var promos = getBasketPromos();
    var officePromoBlocks = getOfficePromos(promos).slice(0,2);
    var avPromoBlocks = getAVPromos(promos).slice(0,2);
    return { officePromoBlocks, avPromoBlocks };

}

function initiliaseAddToBasketButton(block) {

    var tagging = {
        location : 'attachInBasket',
        sku : block.getAttribute('data-promo-sku')
    };
    window.AddProductsToBasket(block, tagging);

}

function setPromoStates(skusFound, blocks) {

    if(skusFound.length) {
        blocks.forEach(function(block) {
            if(block.hasAttribute('data-attachment-is-in-basket')) {
                block.style.display = 'block';
            }
        });
    }
    else {
        blocks.forEach(function(block) {
            if(block.hasAttribute('data-attachment-is-not-in-basket')) {
                block.style.display = 'block';
                initiliaseAddToBasketButton(block);
            }
        });
    }

}

function checkForComputingAttachmentSkusInBasket() {

    var promos = getBasketPromos();
    var computingPromos = getComputingPromos(promos);
    if(computingPromos.length) {
        var basketData = getInBasketData();
        if(basketData) {
            var skusFound = checkForComputingAttachmentsInBasket(basketData);
            var computingPromoBlocks = getPromoStates(skusFound);
            setPromoStates(skusFound.office, computingPromoBlocks.officePromoBlocks);
            setPromoStates(skusFound.av, computingPromoBlocks.avPromoBlocks);
        }
    }
    else {
        return false;
    }

}

function getInBasketData() {

    var inBasket = document.cookie.split(';').filter(cookie => cookie.match(/BasketSummary/));
    if(inBasket.length) {
        return JSON.parse(inBasket
            .map(cookie => decodeURIComponent(cookie))
            .pop()
            .replace(/(^\s+)?BasketSummary=/, ''));
    }  
    else {
        return null;
    }

}

checkForComputingAttachmentSkusInBasket();