/**
	 * Validates product fields and uploaded image files.
	 *
	 * @param array $d The input vars
	 * @return boolean True when validation successful, false when not
	 */
	function validate(&$d) {
		global $vmLogger, $database, $perm, $VM_LANG;
		require_once(CLASSPATH . 'imageTools.class.php' );
		
		$valid = true;
		$db = new ps_DB;

		$q = "SELECT product_id,product_thumb_image,product_full_image FROM #__{vm}_product WHERE product_sku='";
		$q .= $d["product_sku"] . "'";
		$db->setQuery($q); $db->query();
		if ($db->next_record()&&($db->f("product_id") != $d["product_id"])) {
			$vmLogger->err( "A Product with the SKU ".$d['product_sku']." already exists." );
			$valid = false;
		}
		if( !empty( $d['product_discount_id'] )) {
			if( $d['product_discount_id'] == "override" ) {

				$d['is_percent'] = "0";
				
				// If discount are applied before tax then base the discount on the untaxed price
				if( PAYMENT_DISCOUNT_BEFORE == '1' ) {
					$d['amount'] = (float)$d['product_price'] - (float)$d['discounted_price_override'];
				}
				// Otherwise, base the discount on the taxed price
				else {
					$d['amount'] = (float)$d['product_price_incl_tax'] - (float)$d['discounted_price_override'];
				}
				
				// Set the discount start date as today
				$d['start_date'] = date( 'Y-m-d' );

				require_once( CLASSPATH. 'ps_product_discount.php' );
				$ps_product_discount = new ps_product_discount;
				$ps_product_discount->add( $d );
				$d['product_discount_id'] = $database->insertid();
				vmRequest::setVar( 'product_discount_id', $d['product_discount_id'] );
			}
		}
		if (empty($d['manufacturer_id'])) {
			$d['manufacturer_id'] = "1";
		}
		if (empty( $d["product_sku"])) {
			$vmLogger->err( $VM_LANG->_('VM_PRODUCT_MISSING_SKU',false) );
			$valid = false;
		}
		if (!$d["product_name"]) {
			$vmLogger->err( $VM_LANG->_('VM_PRODUCT_MISSING_NAME',false) );
			$valid = false;
		}
		if (empty($d["product_available_date"])) {
			$vmLogger->err( $VM_LANG->_('VM_PRODUCT_MISSING_AVAILDATE',false) );
			$valid = false;
		}
		else {
			$day = (int) substr ( $d["product_available_date"], 8, 2);
			$month= (int) substr ( $d["product_available_date"], 5, 2);
			$year = (int) substr ( $d["product_available_date"], 0, 4);
			$d["product_available_date_timestamp"] = mktime(0,0,0,$month, $day, $year);
		}

		/** Validate Product Specific Fields **/
		if (!$d["product_parent_id"]) {
			if( empty( $d['product_categories']) || !is_array(@$d['product_categories'])) {
				$d['product_categories'] = explode('|', $d['category_ids'] );
			}
			if (sizeof(@$d["product_categories"]) < 1) {
				$vmLogger->err( $VM_LANG->_('VM_PRODUCT_MISSING_CATEGORY') );
				$valid = false;
			}
		}
		/** Image Upload Validation **/

		// do we have an image URL or an image File Upload?
		if (!empty( $d['product_thumb_image_url'] )) {
			// Image URL
			if (substr( $d['product_thumb_image_url'], 0, 4) != "http") {
				$vmLogger->err( $VM_LANG->_('VM_PRODUCT_IMAGEURL_MUSTBEGIN',false) );
				$valid =  false;
			}

			// if we have an uploaded image file, prepare this one for deleting.
			if( $db->f("product_thumb_image") && substr( $db->f("product_thumb_image"), 0, 4) != "http") {
				$_REQUEST["product_thumb_image_curr"] = $db->f("product_thumb_image");
				$d["product_thumb_image_action"] = "delete";
				if (!vmImageTools::validate_image($d,"product_thumb_image","product")) {
					return false;
				}
			}
			$d["product_thumb_image"] = $d['product_thumb_image_url'];
		}
		else {
			// File Upload
			if (!vmImageTools::validate_image($d,"product_thumb_image","product")) {
				$valid = false;
			}
		}

		if (!empty( $d['product_full_image_url'] )) {
			// Image URL
			if (substr( $d['product_full_image_url'], 0, 4) != "http") {
				$vmLogger->err( $VM_LANG->_('VM_PRODUCT_IMAGEURL_MUSTBEGIN',false) );
				return false;
			}
			// if we have an uploaded image file, prepare this one for deleting.
			if( $db->f("product_full_image") && substr( $db->f("product_full_image"), 0, 4) != "http") {
				$_REQUEST["product_full_image_curr"] = $db->f("product_full_image");
				$d["product_full_image_action"] = "delete";
				if (!vmImageTools::validate_image($d,"product_full_image","product")) {
					return false;
				}
			}
			$d["product_full_image"] = $d['product_full_image_url'];
		}
		else {
			// File Upload
			if (!vmImageTools::validate_image($d,"product_full_image","product")) {
				$valid = false;
			}
		}
		
		// added for advanced attribute modification
		// strips the trailing semi-colon from an attribute
        if(isset($d["product_advanced_attribute"])) {
		    if (';' == substr($d["product_advanced_attribute"], strlen($d["product_advanced_attribute"])-1,1) ) {
			    $d["product_advanced_attribute"] =substr($d["product_advanced_attribute"], 0, strlen($d["product_advanced_attribute"])-1);
		    }
        }
		// added for custom attribute modification
		// strips the trailing semi-colon from an attribute
        if(isset($d["product_custom_attribute"])) {
		    if (';' == substr($d["product_custom_attribute"], strlen($d["product_custom_attribute"])-1,1) ) {
			    $d["product_custom_attribute"] =substr($d["product_custom_attribute"], 0, strlen($d["product_custom_attribute"])-1);
		    }
        }
		$d["clone_product"] = empty($d["clone_product"]) ? "N" : "Y";
		$d["product_publish"] = empty($d["product_publish"]) ? "N" : "Y";
		$d["product_special"] = empty($d["product_special"]) ? "N" : "Y";
        //parse quantity and child options
        $d['display_headers'] = vmGet($d,'display_headers', 'Y') =='Y' ? 'Y' : 'N';
        $d['product_list_child'] = vmGet($d,'product_list_child', 'Y') =='Y' ? 'Y' : 'N';
        $d['display_use_parent'] = vmGet($d,'display_use_parent', 'Y') =='Y' ? 'Y' : 'N';
        $d['product_list_type'] = vmGet($d,'product_list_type', 'Y') =='Y' ? 'Y' : 'N';
        $d['display_desc'] = vmGet($d,'display_desc', 'Y') =='Y' ? 'Y' : 'N';
        
        if (@$d['product_list'] =="Y") {
            if($d['list_style'] == "one")
                $d['product_list'] = "Y";
            else
                $d['product_list'] = "YM";            
        }
        else {
            $d['product_list'] = "N";
        }
        
        $d['quantity_options'] = ps_product::set_quantity_options($d);
		$d['child_options'] = ps_product::set_child_options($d);
		
        $d['order_levels'] = vmRequest::getInt('min_order_level').",".vmRequest::getInt('max_order_level');
        
		return $valid;
	}