prestashop custom module hook with id_product - hook

Question

I'm developing a custom module for add a button "notify me" when product is out of stock.
this button should simply call an action and write in a custom table (created by this module)
my problem is pass the id_product to the hook
public function install() {
$sql= "CREATE TABLE IF NOT EXISTS `"._DB_PREFIX_."fasys_notify`(
`id` INT(11) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
`title` VARCHAR(256) NOT NULL )";
if (parent::install() == false ||
!$this->registerHook('notify') ||
!$this->registerHook('displayHeader') ||
!Db::getInstance()->Execute($sql)
)
return false;
return true;
}
public function hookFasysNotify($params) {
//NEED ID_PRODUCT HERE
//var_dump(Tools::getValue('id_product')); //doesen't works
$html ='<button type="button" class="notifyme_btn btn btn-info btn-default">Notify Me</button>';
return $html ;
}
in my .tpl file i have added this:
{hook h='fasysNotify' product=$product}
how can I retrieve the product ?

Answer 1

.tpl
{hook h='fasysNotify' product=$product}
module:
public function hookNotify($params) {
var_dump( $params['product'] );
}

Answer 2

in tpl :
{hook h='fasysNotify' product=$product}
or
{hook h='fasysNotify' product=$id_product}
in module :
$id_product = $param['id_product'];
or
$id_product = $param;