Bundle availability including quantity using $.Deffered

bundled.v2.js

; bundles = [];
{% for variant in product.variants %}{% if variant.metafields.sva.bundled %}
bundles['{{ variant.id }}'] = jQuery.parseJSON('{{ variant.metafields.sva.bundled }}');
{% endif %}{% endfor %}

var process= function(target, results) {
  var deferred = $.Deferred();

  Shopify.getProduct(target.handle, function(product) {
	var multiplier = target.multiplier || 1,
		variants = jQuery.grep(product.variants, function(variant) { // find matching variants
			return jQuery.inArray(variant.id, target.variants) > -1
    	});
                
	jQuery.each(variants, function(i, variant) {
        results.push({variant: variant.id, available: (variant.inventory_quantity >= multiplier), quantity: variant.inventory_quantity, multiplier: target.multiplier})
	});

     deferred.resolve();
  })

  return deferred.promise();
}

var bundled = function(id, callback) {
    var targets = bundles[id];

    if (targets) {
	var processes = [], results = [], i;

        jQuery.each(targets, function(n, target) {
		processes.push(process(target, results));
        })

	$.when.apply($, processes).done(function () {
		var available = true, quantity = 100;
		for (i = 0; i < results.length; i++) {
        	    	if (results[i].available == false) {
        			available = false;
				quantity = 0;
				break;
            		} else {
            			var bundledQuantity = Math.round(results[i].quantity/results[i].multiplier);
                    		if (quantity > bundledQuantity) {
                    			quantity = bundledQuantity;
                    		}
            		}
        	}
		callback({available: available, quantity: quantity});
        });

	return true;
    } else {
	callback({available: true});
	return false;
    }
}