Method getStockItemsChangedByAttributes

/*
 * $selectedAttributes ... ajax, checkout, checkout json - attributes are not all attributes assigned to product but only the one selected by e.g. select box
 * (including the option that no attribute was selected - in this case the main product is even a variant)
 */
public static function getStockItemsChangedByAttributes(&$stockStatus, $attributes, $item, $selectedAttributes = 0)
{
    //$paramsC 			= PhocacartUtils::getComponentParameters();
    //$display_unit_price	= $paramsC->get( 'display_unit_price', 1 );
    $stock = 0;
    // main stock count - rendered output of stock item (by product, attribute or mix of attributes ASM)
    $stockProduct = isset($item->stock) ? $item->stock : 0;
    // stock stored by product
    $stockAttribute = 0;
    // stock stored by each attribute
    $fullAttributes = array();
    // Array of full objects (full options object)
    $thinAttributes = array();
    // Array of integers only
    if ($selectedAttributes == 2) {
        // Final order, we get the attributes in different format as by adding them to cart
        // it is final order, we order the items so we don't check e.g. if default values or not - the values are selected yet
        $fullAttributes = PhocacartAttribute::getAttributeFullValues($attributes);
        $thinAttributes = PhocacartAttribute::getAttributesSanitizeOptionArray($attributes);
        //select only default v a to create product key
    } else {
        if ($selectedAttributes == 1) {
            $fullAttributes = PhocacartAttribute::getAttributeFullValues($attributes);
            $thinAttributes = $attributes;
            //select only default value attributes (selected options) to create product key
        } else {
            $fullAttributes = $attributes;
            $thinAttributes = PhocacartAttribute::getAttributesSelectedOnly($attributes);
            //select only default v a to create product key
        }
    }
    // Stock Calculation
    // 0 ... Main Product
    // 1 ... Product Variations
    // 2 ... Advanced Stock Management
    // 3 ... Advanced Stock And Price Management ( 2 + price)
    if ($item->stock_calculation == 1) {
        // Product Variations - Be aware can be wrong count of stock when mixing attributes - works only one attribute
        $i = 0;
        if (!empty($fullAttributes)) {
            // Is some attribute with its option active (selected). If not, then the main product variant should be set
            $productAttributeSelected = 0;
            foreach ($fullAttributes as $k => $v) {
                $attributeSelected = 0;
                $stockAttribute = 0;
                if (!empty($v->options)) {
                    $i++;
                    foreach ($v->options as $k2 => $v2) {
                        // Is the options set as default
                        // See: administrator\components\com_phocacart\libraries\phocacart\price\price.php
                        // function getPriceItemsChangedByAttributes - similar behaviour
                        if ($selectedAttributes == 1 || $selectedAttributes == 2 || $selectedAttributes == 0 && isset($v2->default_value) && $v2->default_value == 1) {
                            $attributeSelected = 1;
                            $productAttributeSelected = 1;
                            if (isset($v2->stock) && $v2->stock > 0) {
                                $stockAttribute += (int) $v2->stock;
                            }
                        }
                    }
                }
                if ($attributeSelected == 1) {
                    $stock += $stockAttribute;
                } else {
                    // we iterate over attributes not products
                    // so this is the variant for main product
                    // IF there is more than one parameter, this will be always wrong here because
                    // 1) first attribute not selected, second selected: should we add only second or second plus main product stock?
                    // Product stock 100
                    // Product attribute A stock 50
                    // Product attribute B stock 50
                    // first attribute not selected = 0, second selected = 50 (we skip to add the main product 100)
                    // 2) first not selected, second not selected: ok we add only the main product stock
                    // both have 0 but we select main product which is 100
                    // if we should add main product then:
                    // $stock += $stockProduct;
                }
            }
            if ($productAttributeSelected == 0) {
                // We have attributes and their options
                // but no one set as default or selected
                $stock += $stockProduct;
            }
        } else {
            if ($selectedAttributes == 1) {
                // If there are no attributes, the main product is the varaint itself
                $stock += $item->stock;
            }
        }
        if ($i > 1 && $selectedAttributes != 1) {
            PhocacartLog::add(3, 'Warning', $item->id, Text::_('COM_PHOCACART_INAPPROPRIATE_METHOD_STOCK_CALCULATION_PRODUCT_VARIATIONS') . ' ' . Text::_('COM_PHOCACART_PRODUCT') . ': ' . $item->title);
        }
    } else {
        if ($item->stock_calculation == 2 || $item->stock_calculation == 3) {
            // Advanced Stock Management
            $k = PhocacartProduct::getProductKey((int) $item->id, $thinAttributes);
            $stock = PhocacartAttribute::getCombinationsStockByKey($k);
        } else {
            // Main Product
            $stock = $item->stock;
        }
    }
    // Get all stock status information: count, status, image, ...
    $stockStatus = PhocacartStock::getStockStatus((int) $stock, (int) $item->min_quantity, (int) $item->min_multiple_quantity, (int) $item->stockstatus_a_id, (int) $item->stockstatus_n_id);
    return $stock;
}