Hide/Enable custom fields depending from products

<?php
/**
 * @package	HikaShop for Joomla!
 * @version	2.1.0
 * @author	hikashop.com
 * @copyright	(C) 2010-2012 HIKARI SOFTWARE. All rights reserved.
 * @license	GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');

  // Stefano Start
  // Legge i dati dell'utente 
  $user =& JFactory::getUser();
  $userGroups = JAccess::getGroupsByUser($user->id, true);
  // parte per conotrollo se almeno un prodotto fa parte della categoria regalo
  $regalo = 0;
  foreach($this->rows as $product){
	  $db = JFactory::getDBO();
	  $db->setQuery('SELECT category_id FROM #__hikashop_product_category WHERE product_id='.$product->product_id);
	  $categories = $db->loadObjectList();
	  foreach($categories as $category){
		if($category->category_id==39){
		   $regalo = 1;
		  }
	  }
  }
  $visualizza = 1;
  // se è già abbonato oppure se non vi sono articolo regalo non stampa la sezione dei deti supplementari
  if (in_array(11,$userGroups))  $visualizza = 0; 
  if ($regalo == 0)   $visualizza = 0; 
  
  if ($visualizza == 1) {
    // Stefano End
	
?><?php if(hikashop_level(2) && !empty($this->extraFields['order'])){ ?>
<div  id="hikashop_checkout_additional_info" class="hikashop_checkout_additional_info">
	<fieldset class="input">
		<legend><?php echo JText::_('ADDITIONAL_INFORMATION');?></legend>
		<table cellpadding="0" cellspacing="0" border="0" class="hikashop_contentpane">
	<?php
		if(!empty($this->extraFields['order'])){
			JRequest::setVar('hikashop_check_order',1);
			$this->setLayout('custom_fields');
			$this->type = 'order';
			echo $this->loadTemplate();
		}
	?>
		</table>
	</fieldset>
</div>
<div style="clear:both"></div>
<?php } 

  // Stefano Start   
  }
  // Stefano End ?>

<?php
/**
 * @package  HikaShop for Joomla!
 * @version  2.1.0
 * @author  hikashop.com
 * @copyright  (C) 2010-2012 HIKARI SOFTWARE. All rights reserved.
 * @license  GNU/GPLv3 http://www.gnu.org/licenses/gpl-3.0.html
 */
defined('_JEXEC') or die('Restricted access');
?><?php
$showfields = array(
  'my_special_field1' => 0, // my_special_field1 display only on step 0
);
$type = $this->type;
foreach($this->extraFields[$type] as $fieldName => $oneExtraField) {

  // Stefano Start
  $user =& JFactory::getUser();
  $userGroups = JAccess::getGroupsByUser($user->id, true);
  // non entra e quindi non stampa se l'utente fa parte del gruppo "Cliente Abbonato" e se il campo custom da scrivere si chiama 'order_portaunamico'
  // ci vorrebbe una miglioria per evitare di stampare la sezione "informazioni supplementari" qualora ci fosse solo il campo 'order_portaunamico'
  // nel mio caso avendone di sicuro 2 non mi metto a perdere tempo su questa miglioria
  
  // parte per conotrollo se almeno un prodotto fa parte della categoria regalo
  $regalo = 0;
  foreach($this->rows as $product){
	  $db = JFactory::getDBO();
	  $db->setQuery('SELECT category_id FROM #__hikashop_category WHERE product_id='.$product->product_id);
	  $categories = $db->loadObjectList();
	  foreach($categories as $category){
		if($category->category_id==39){
		   $regalo = 1;
		  }
	  }
  }
  
  $visualizza = 1;
  if (  (in_array(11,$userGroups) and ($oneExtraField->field_namekey=='order_portaunamico'))  )     $visualizza = 0;
  if (  ($regalo == 0) and ($oneExtraField->field_namekey=='order_bigliettoauguri')  )     $visualizza = 0;
  if (  ($regalo == 0) and ($oneExtraField->field_namekey=='order_comespedirebiglietto')  )     $visualizza = 0;
  if (  ($regalo == 0) and ($oneExtraField->field_namekey=='order_notespedizionebiglietto')  )     $visualizza = 0;
  if (  ($regalo == 0) and ($oneExtraField->field_namekey=='order_emailamico')  )     $visualizza = 0;
  if (  ($regalo == 0) and ($oneExtraField->field_namekey=='order_frasebiglietto')  )     $visualizza = 0;
  
  if ($visualizza == 1) {
  // Stefano End
  
	  if(isset($showfields[$fieldName]) && $this->step != $showfields[$fieldName]) {
		echo '<tr style="display:none;"><td><input type="hidden" name="data['.$type.']['.$fieldName.']" value="'.$this->escape($this->$type->$fieldName).'"/></td></tr>';
		continue;
	  }
	?>
	  <tr class="hikashop_checkout_<?php echo $fieldName;?>_line" id="hikashop_<?php echo $type.'_'.$oneExtraField->field_namekey; ?>">
		<td class="key">
		  <?php echo $this->fieldsClass->getFieldName($oneExtraField);?>
		</td>
		<td>
	<?php
	  $onWhat='onchange';
	  if($oneExtraField->field_type=='radio')
		$onWhat='onclick';

	  echo $this->fieldsClass->display($oneExtraField,$this->$type->$fieldName,'data['.$type.']['.$fieldName.']',false,' '.$onWhat.'="hikashopToggleFields(this.value,\''.$fieldName.'\',\''.$type.'\',0);"');
	?>
		</td>
	  </tr>
	<?php
  // Stefano Start   
  }
  // Stefano End
}