$cart_rule = new CartRule();

$languages = Language::getLanguages();

foreach($languages as $key => $language){
$array[$language['id_lang']] = "Gift";
                        }

$cart_rule->name = $array;

$cart_rule->description = "Gift";

$cart_rule->partial_use = 1;

$cart_rule->reduction_currency = intval(Configuration::get('PS_CURRENCY_DEFAULT'));
                        
$cart_rule->active = 1;

$cart_rule->date_from = "$startdate";
$cart_rule->date_to = "$enddate";

$cart_rule->minimum_amount = '1';
$cart_rule->minimum_amount_currency = '1';

$cart_rule->quantity = '1';

$cart_rule->quantity_per_user = '1';
$cart_rule->product_restriction = '1';
$cart_rule->reduction_percent = '';
$cart_rule->priority = '1';
$cart_rule->reduction_product = '';
$cart_rule->gift_product = $id_gift;
$cart_rule->date_add = 'NOW()';
$cart_rule->date_upd = 'NOW()';
//d($cart_rule);
$cart_rule->add();

$cart_rule = new CartRule();
foreach(Language::getLanguages() as $language)
    $cart_rule->name[$language['id_lang']] = "Gift";
$cart_rule->description = "Gift";
$cart_rule->partial_use = 1;
$cart_rule->reduction_currency = (int)Configuration::get('PS_CURRENCY_DEFAULT');
$cart_rule->active = 1;
$cart_rule->date_from = $startdate;
$cart_rule->date_to = $enddate;
$cart_rule->minimum_amount = 1;
$cart_rule->minimum_amount_currency = 1;
$cart_rule->quantity = 1;
$cart_rule->quantity_per_user = 1;
$cart_rule->product_restriction = 1;
$cart_rule->priority = 1;
$cart_rule->gift_product = $id_product;
$cart_rule->add();

$cart_rule = new CartRule();
foreach(Language::getLanguages() as $language)
    $cart_rule->name[$language['id_lang']] = "Gift";
$cart_rule->description = "Gift";
$cart_rule->partial_use = 1;
$cart_rule->reduction_currency = (int)Configuration::get('PS_CURRENCY_DEFAULT');
$cart_rule->active = 1;
$cart_rule->date_from = $startdate;
$cart_rule->date_to = $enddate;
$cart_rule->minimum_amount = 1;
$cart_rule->minimum_amount_currency = 1;
$cart_rule->quantity = 1;
$cart_rule->quantity_per_user = 1;
$cart_rule->product_restriction = 1;
$cart_rule->priority = 1;
$cart_rule->gift_product = $id_gift;

if ($cart_rule->add())
{
    Db::getInstance()->execute('INSERT INTO `'._DB_PREFIX_.'cart_rule_product_rule_group` (`id_cart_rule`, `quantity`)
    VALUES ('.(int)$cart_rule->id.', 1)');
    $id_product_rule_group = Db::getInstance()->Insert_ID();
    Db::getInstance()->execute('INSERT INTO `'._DB_PREFIX_.'cart_rule_product_rule` (`id_product_rule_group`, `type`)
    VALUES ('.(int)$id_product_rule_group.', "products")');
    $id_product_rule = Db::getInstance()->Insert_ID();
    Db::getInstance()->execute('INSERT INTO `'._DB_PREFIX_.'cart_rule_product_rule_value` (`id_product_rule`, `id_item`) VALUES ('.(int)$id_product_rule.', '.(int)$id_product.')');
}