updatePageMessaging-display.js

var $stockCount,
    $leadTimeText,
    $stockZero,
    $availabilityVaries,
    $freeShipping,
    pageMessaging = {
        'hideUnavailableByLocation': function(){},
        'showUnavailableByLocation': function(){}
    };

function updateStockMessage(){}
function hasAvailabilityByLocation(){}
function isFinishSelected(){}
function isPostalCodeDefined(){}
function toggleAddToCart(){}
function getSelectedFinish(){}

/*
Refactor below
 */

function updatePageMessaging($swatch) {
    var currentSelectedFinish = $swatch || getSelectedFinish(),
        stock = getStock(),
        hideOutOfStockMessage = currentSelectedFinish.data("hidemessage") === true;
    if(hasAvailabilityByLocation())
        updateAvailableByLocationStock(currentSelectedFinish, stock, hideOutOfStockMessage);
    else
        updateAlwaysAvailableStock(stock, hideOutOfStockMessage);
}

function updateAvailableByLocationStock(currentSelectedFinish, stock, hideOutOfStockMessage) {
    $availabilityVaries.show();
    if(isFinishSelected() && isPostalCodeDefined()) {
        $availabilityVaries.find('label').removeClass('prd_error_highlight');
        if(currentSelectedFinish.data("isavailable")) {
            pageMessaging.hideUnavailableByLocation();
            updateStockMessage($stockCount, stock).show();

            if(stock > 0) {
                $stockZero.hide();
                $leadTimeText.show();
                toggleAddToCart(true);
            } else {
                if(stock === 0)
                    $stockCount.hide();
                else if(hideOutOfStockMessage)
                    $stockCount.text('Out Of Stock').addClass('out-of-stock').show();
                toggleAddToCart(false);
            }
        } else {
            pageMessaging.showUnavailableByLocation();
            $stockCount.hide();
            $stockZero.hide();
            $freeShipping.hide();
            $leadTimeText.hide();
            toggleAddToCart(false);
        }
    } else {
        toggleAddToCart(false);
    }
}

function updateAlwaysAvailableStock(stock, hideOutOfStockMessage) {
    $leadTimeText.show();
    if(stock > 0) {
        $stockZero.hide();
        updateStockMessage($stockCount, stock).show();
    } else {
        if(stock === 0) {
            $stockCount.hide();
        }

        hideOutOfStockMessage ? $stockZero.hide() : $stockZero.show();
    }
}

function getStock(currentSelectedFinish) {
    if (hasAvailabilityByLocation && currentSelectedFinish.data("sku") === undefined) {
        currentSelectedFinish = currentSelectedFinish.parent("li").find("div[data-name]");
        return parseInt(currentSelectedFinish.data("stock"), 10);
    }
    return currentSelectedFinish.length ? parseInt(currentSelectedFinish.data('stock'), 10): null;
}