'use strict';

const multer = require('multer');

const ALLOWED_MIME = new Set([
  'image/jpeg', 'image/png', 'image/webp', 'image/gif', 'image/svg+xml',
]);

const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 5 * 1024 * 1024 }, // 5 MB
  fileFilter(req, file, cb) {
    if (ALLOWED_MIME.has(file.mimetype)) return cb(null, true);
    cb(Object.assign(new Error('Only JPEG, PNG, WebP, GIF, or SVG images are allowed.'), { code: 'INVALID_TYPE' }));
  },
});

const badgeSingle = upload.single('badge');

const handleBadgeUpload = (req, res, next) => {
  badgeSingle(req, res, (err) => {
    if (!err) return next();
    if (err.code === 'LIMIT_FILE_SIZE')
      return res.status(400).json({ status: 'error', message: 'Badge image must be under 5 MB.' });
    if (err.code === 'INVALID_TYPE')
      return res.status(400).json({ status: 'error', message: err.message });
    console.error('[MULTER BADGE]', err);
    return res.status(400).json({ status: 'error', message: err.message ?? 'Upload failed.' });
  });
};

module.exports = { handleBadgeUpload };