public function postProcess()
 {
     if (Tools::isSubmit('submitAddinvoice_date')) {
         if (!Validate::isDate(Tools::getValue('date_from'))) {
             $this->errors[] = $this->l('Invalid "From" date');
         }
         if (!Validate::isDate(Tools::getValue('date_to'))) {
             $this->errors[] = $this->l('Invalid "To" date');
         }
         if (!count($this->errors)) {
             if (count(OrderInvoice::getByDateInterval(Tools::getValue('date_from'), Tools::getValue('date_to')))) {
                 Tools::redirectAdmin($this->context->link->getAdminLink('AdminPdf') . '&submitAction=generateInvoicesPDF&date_from=' . urlencode(Tools::getValue('date_from')) . '&date_to=' . urlencode(Tools::getValue('date_to')));
             }
             $this->errors[] = $this->l('No invoice has been found for this period.');
         }
     } elseif (Tools::isSubmit('submitAddinvoice_status')) {
         if (!is_array($status_array = Tools::getValue('id_order_state')) || !count($status_array)) {
             $this->errors[] = $this->l('You must select at least one order status.');
         } else {
             foreach ($status_array as $id_order_state) {
                 if (count(OrderInvoice::getByStatus((int) $id_order_state))) {
                     Tools::redirectAdmin($this->context->link->getAdminLink('AdminPdf') . '&submitAction=generateInvoicesPDF2&id_order_state=' . implode('-', $status_array));
                 }
             }
             $this->errors[] = $this->l('No invoice has been found for this status.');
         }
     } else {
         parent::postProcess();
     }
 }
 public function processGenerateInvoicesPDF()
 {
     $order_invoice_collection = OrderInvoice::getByDateInterval(Tools::getValue('date_from'), Tools::getValue('date_to'));
     if (!count($order_invoice_collection)) {
         die(Tools::displayError('No invoice was found.'));
     }
     $this->generatePDF($order_invoice_collection, PDF::TEMPLATE_INVOICE);
 }
 public function processGenerateInvoicesPDF()
 {
     $order_invoice_collection = OrderInvoice::getByDateInterval(Tools::getValue('date_from'), Tools::getValue('date_to'));
     if (!count($order_invoice_collection)) {
         die($this->trans('No invoice was found.', array(), 'Admin.OrdersCustomers.Notification'));
     }
     $this->generatePDF($order_invoice_collection, PDF::TEMPLATE_INVOICE);
 }