Prestashop 1.7 - Mise à jour du prix en fonction de la quantité

baba_updqtprice.php

<?php
if (!defined('_PS_VERSION_')) {
    exit;
} 
 
class baba_updqtprice extends Module
{
    public function __construct()
    {
        $this->name = 'baba_updqtprice';
        $this->tab = 'others';
        $this->version = '1.0.0';
        $this->author = 'presta.cafe';
        $this->bootstrap = true;
        parent::__construct();
        $this->displayName = $this->l('baba_updqtprice');
        $this->description = $this->l('Update price by quantity on product page');
    }
 
    /**
     * Installation du module
     * @return bool
     */
    public function install()
    {
        if (!parent::install()
            || !$this->registerHook([
                'header',
            ]) 
        ) {
            return false;
        }
        return true;
    }
 
    /**
     * Désinstallation du module
     * @return bool
     */
    public function uninstall()
    {
        if (
            !parent::uninstall()
        ) {
            return false;
        }
        return true;
    }

    public function hookDisplayHeader($params)
    {

        $page = Dispatcher::getInstance()->getController();

        if($page == 'product') {

            // on instancie la currencie
            $currency = new Currency((int)$params["cookie"]->id_currency);
            
            Media::addJsDef(['currency' => $currency->sign]);

            $this->context->controller->addJS(($this->_path).'views/js/baba_updqtprice.js');
        } else {
            return false;
        }
        
    }
    
}

baba_updqtprice.js

prestashop.on('updatedProduct', calculate);
 
 function calculate (){

    var qt = $("#quantity_wanted").val();
    var regular_price = $(".regular-price").text();
    var regular_price_rep = regular_price.toString().replace(currency, '').toString().replace(',', '.');
    var regular_price_change = (regular_price_rep*qt).toFixed(2);
    var currentprice = $(".current-price-value").attr("content");
    var new_currentprice = (currentprice*qt).toFixed(2);
    $( ".regular-price" ).replaceWith("<span class='regular-price'>"   regular_price_change   ' '   currency   "</span>");
    $( ".current-price-value" ).replaceWith("<span class='current-price-value' content='"   new_currentprice   "' >"   new_currentprice   ' '   currency   "</span>");

}