import multer from 'multer';

function fileFilter(_req: unknown, file: Express.Multer.File, cb: multer.FileFilterCallback) {
  const isXlsx =
    file.mimetype === 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' ||
    file.originalname.toLowerCase().endsWith('.xlsx');
  if (!isXlsx) return cb(new Error('Only .xlsx files are allowed'));
  cb(null, true);
}

export const uploadImportFile = multer({
  storage: multer.memoryStorage(),
  fileFilter,
  limits: { fileSize: 5 * 1024 * 1024 },
}).single('file');