StoreDocumentDetails::updateFiles

private function updateFiles(int $documentId, array $files): void
{
	$isSuccess = true;
	$pendingFiles = null;

	$fileIds = array_filter($files, static fn ($file) => !is_array($file));
	$filesToSave = array_filter($files, static fn ($file) => is_array($file) && !empty($file['token']));

	if (!empty($filesToSave))
	{
		$tokens = array_column($filesToSave, 'token');
		$pendingFiles = $this->getDocumentPendingFiles($tokens);
		$fileIds = array_merge($fileIds, $pendingFiles->getFileIds());
	}

	$existingFiles = StoreDocumentFileTable::getList([
		'select' => ['ID', 'FILE_ID'],
		'filter' => ['=DOCUMENT_ID' => $documentId],
	])->fetchAll();

	$existingFileIds = array_column($existingFiles, 'FILE_ID');
	$filesToDelete = array_diff($existingFileIds, $fileIds);
	if (!empty($filesToDelete))
	{
		$fileIdToPrimary = array_column($existingFiles, 'ID', 'FILE_ID');
		$idsToDelete = array_intersect_key($fileIdToPrimary, array_fill_keys($filesToDelete, true));
		foreach ($idsToDelete as $id)
		{
			$deleteResult = StoreDocumentFileTable::delete($id);
			if ($deleteResult->isSuccess())
			{
				\CFile::Delete($id);
			}
			else
			{
				$isSuccess = false;
			}
		}
	}

	$filesToAdd = array_diff($fileIds, $existingFileIds);
	foreach ($filesToAdd as $fileToAdd)
	{
		$addResult = StoreDocumentFileTable::add([
			'DOCUMENT_ID' => $documentId,
			'FILE_ID' => $fileToAdd,
		]);
		if ($addResult->isSuccess())
		{
			if ($pendingFile = $pendingFiles->getByFileId($fileToAdd))
			{
				$pendingFile->makePersistent();
			}
		}
		else
		{
			$isSuccess = false;
		}
	}

	if (!$isSuccess)
	{
		$this->addNonCriticalError(
			new Error(
				Loc::getMessage('MOBILE_CONTROLLER_CATALOG_DETAILS_ERROR_DOCUMENT_PRODUCTS_SAVE_ERROR')
			)
		);
	}
}