WebSockets

// Socket.IO — chat em tempo real

// server.js
const express = require('express')
const { createServer } = require('node:http')
const { Server } = require('socket.io')

const app = express()
const httpServer = createServer(app)
const io = new Server(httpServer, {
  cors: { origin: process.env.CLIENT_URL }
})

// Autenticar conexão WebSocket
io.use((socket, next) => {
  const token = socket.handshake.auth.token
  try {
    socket.user = jwt.verify(token, process.env.JWT_SECRET)
    next()
  } catch { next(new Error('Unauthorized')) }
})

io.on('connection', (socket) => {
  const { userId, name } = socket.user

  socket.join(`user:${userId}`) // sala pessoal

  socket.on('chat:send', ({ roomId, text }) => {
    const msg = { userId, name, text, at: new Date() }
    io.to(roomId).emit('chat:message', msg)
    db.messages.save(msg)
  })

  socket.on('disconnect', () => {
    console.log('Desconectado:', userId)
  })
})