setTemplateName example

        if ($entry->getContentText() !== null) {
            $mail->setBodyText($entry->getContentText());
        }

        if ($entry->getContentHtml() !== null) {
            $mail->setBodyHtml($entry->getContentHtml());
        }

        if ($entry->getType() !== null) {
            $mail->setTemplateName($entry->getType()->getName());
        }

        if ($entry->getOrder() !== null) {
            $mail->setAssociation(LogEntryBuilder::ORDER_ASSOCIATION, $entry->getOrder());
        }

        if ($entry->getShop() !== null) {
            $mail->setAssociation(LogEntryBuilder::SHOP_ASSOCIATION, $entry->getShop());
        }

        $this->assignOrderDocuments($entry, $mail);
        

            $mediaService = Shopware()->Container()->get(MediaServiceInterface::class);
            if (!$mediaService->has($attachment->getPath())) {
                Shopware()->Container()->get('corelogger')->error('Could not load file: ' . $attachment->getPath());
            } else {
                $fileAttachment = $mail->createAttachment($mediaService->read($attachment->getPath()));
                $fileAttachment->filename = $attachment->getFileName();
            }
        }

        $mail->setTemplateName($mailModel->getName());

        if ($this->getShop() !== null) {
            $mail->setAssociation(LogEntryBuilder::SHOP_ID_ASSOCIATION, $this->getShop()->getId());
        }

        return $mail;
    }
}