<?php
class Orange35_Colorpicker_Helper_Data extends Mage_Checkout_Helper_Cart
{

	/**
     * Retrieve url for add product to cart
     *
     * @param Mage_Catalog_Model_Product $product
     * @param array $additional
     * @return string
     */
    public function getAddUrl($product, $additional = array())
    {
        $routeParams = array(
            Mage_Core_Controller_Front_Action::PARAM_NAME_URL_ENCODED => $this->_getHelperInstance('core')
                ->urlEncode($this->getCurrentUrl()),
            'product' => $product->getEntityId(),
            Mage_Core_Model_Url::FORM_KEY => $this->_getSingletonModel('core/session')->getFormKey()
        );

        if (!empty($additional)) {
            $routeParams = array_merge($routeParams, $additional);
        }

        if ($product->hasUrlDataObject()) {
            $routeParams['_store'] = $product->getUrlDataObject()->getStoreId();
            $routeParams['_store_to_url'] = true;
        }

        if ($this->_getRequest()->getRouteName() == 'mediaupdate'
            && $this->_getRequest()->getControllerName() == 'cart') {
            $routeParams['in_cart'] = 1;
        }

        //only this row below is changed
        return $this->_getUrl('mediaupdate/cart/add', $routeParams);
    }

    /**
     * Check if product can be sold
     * @param Mage_Catalog_Model_Product $product
     * @return bool
     */
    public function productIsAvailableForSale($product)
    {   
        $_product = Mage::getModel('catalog/product')->load($product->getId());
        $inStock = $_product->getStockItem()->getIsInStock();
 		
        if ($inStock && $_product->isSalable()) {
            return true;
        } 
        return false;
    }

    /**
     * Define label color depending on the background
     * example of $hexcolor: 454829 //without #
     */
    public function defineLabelColor($hexcolor)
    {
        $r = hexdec(substr($hexcolor,0,2));
        $g = hexdec(substr($hexcolor,2,2));
        $b = hexdec(substr($hexcolor,4,2));
        $yiq = (($r*299)+($g*587)+($b*114))/1000;
        return ($yiq >= 128) ? '#000000' : '#FFFFFF';
    }
}