<?php

class Efarma_CatalogInventory_Helper_StockManagement extends Mage_Core_Helper_Abstract
{
    public function getFinalQty($product)
    {
        $stockItem = Mage::getModel('cataloginventory/stock_item')->loadByProduct($product);

        $prodQty = (float)$stockItem->getQty();
        $prodMaxSaleQty = (float)$stockItem->getMaxSaleQty();

        $finalQty = $stockItem->checkQty($prodQty);

        $maxFinalQty = is_bool($finalQty) ? $prodQty : $finalQty ;
        $maxQty = ($prodMaxSaleQty < $maxFinalQty) ? $prodMaxSaleQty : $maxFinalQty;

        // Gestione dei deal
        $helper = Mage::helper('dailydeal');
        $deal = $helper->getDealByProduct($product);
        if ($deal) {
            $maxDealQty = (float)$deal->getDealQty();

            if ($maxQty > $maxDealQty) {
                $maxQty = $maxDealQty;
            }
        }

        return $maxQty;
    }

    public function getFinalQtyByProductId($productId)
    {
        $product = Mage::getModel('catalog/product')->load($productId);
        return $this->getFinalQty($product);
    }
}