server.js

const express = require('express');
const multer = require('multer');
const path = require('path');
const fs = require('fs');
const cors = require('cors');

const app = express();
const PORT = 3000;
const uploadDir = path.join(__dirname, 'uploads');
if (!fs.existsSync(uploadDir)) fs.mkdirSync(uploadDir);

const storage = multer.diskStorage({
  destination: uploadDir,
  filename: (req, file, cb) => cb(null, file.originalname)
});
const upload = multer({ storage });

app.use(cors());
app.use(express.json());
app.use(express.static(uploadDir));
app.use(express.static(path.join(__dirname, 'public')));

app.post('/upload', upload.single('file'), (req, res) => {
  if (!req.file) return res.status(400).json({ error: 'No file uploaded' });
  res.json({ message: 'File uploaded successfully', filename: req.file.originalname });
});

app.get('/files', (req, res) => {
  fs.readdir(uploadDir, (err, files) => {
    if (err) return res.status(500).json({ error: 'Could not read upload directory' });
    res.json(files);
  });
});

app.get('/download/:filename', (req, res) => {
  const filePath = path.join(uploadDir, req.params.filename);
  if (!fs.existsSync(filePath)) return res.status(404).json({ error: 'File not found' });
  res.download(filePath);
});

app.listen(PORT, () => {
  console.log(`🚀 FileShare portal running at http://localhost:${PORT}`);
});