import multer, { FileFilterCallback } from 'multer';
import { Request } from 'express';

const fileFilter = (_req: Request, file: Express.Multer.File, cb: FileFilterCallback): void => {
  if (file.mimetype === 'text/csv' || file.originalname.endsWith('.csv')) {
    cb(null, true);
  } else {
    cb(new Error('Only .csv files are allowed'));
  }
};

const upload = multer({
  storage: multer.memoryStorage(),
  fileFilter,
  limits: { fileSize: 5 * 1024 * 1024 },
});

export default upload;