server.js

const express = require('express');
const { createServer } = require('http');
const { Server } = require('socket.io');
const path = require('path');

const app = express();
const server = createServer(app);

// Configure Socket.IO for Vercel
const io = new Server(server, {
  cors: {
    origin: "*",
    methods: ["GET", "POST"]
  },
  transports: ['websocket', 'polling']
});

// Serve static files
app.use(express.static(path.join(__dirname, 'public')));

// Routes
app.get('/', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'index.html'));
});

app.get('/broadcast', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'broadcast.html'));
});

app.get('/view', (req, res) => {
  res.sendFile(path.join(__dirname, 'public', 'view.html'));
});

// Socket.IO connection handling
io.on('connection', (socket) => {
  console.log('User connected:', socket.id);

  socket.on('join-broadcast', () => {
    socket.join('broadcasters');
    console.log('Broadcaster joined:', socket.id);
  });

  socket.on('join-view', () => {
    socket.join('viewers');
    console.log('Viewer joined:', socket.id);
    socket.to('broadcasters').emit('viewer-joined', socket.id);
  });

  socket.on('offer', (data) => {
    socket.to(data.target).emit('offer', {
      offer: data.offer,
      sender: socket.id
    });
  });

  socket.on('answer', (data) => {
    socket.to(data.target).emit('answer', {
      answer: data.answer,
      sender: socket.id
    });
  });

  socket.on('ice-candidate', (data) => {
    socket.to(data.target).emit('ice-candidate', {
      candidate: data.candidate,
      sender: socket.id
    });
  });

  socket.on('disconnect', () => {
    console.log('User disconnected:', socket.id);
  });
});

const PORT = process.env.PORT || 3000;

// For Vercel, we need to export the app
if (process.env.VERCEL) {
  module.exports = app;
} else {
  server.listen(PORT, () => {
    console.log(`Server running on port ${PORT}`);
  });
}