Tu restaurante
vende por
WhatsApp.

// server.js — CMNexo Backend
const { Client, LocalAuth } = require('whatsapp-web.js');
const { Server } = require('socket.io');
const express = require('express');

const app = express();
const io = new Server(server);
const bots = new Map(); // restaurantId → Client

// 1. El restaurante abre la pantalla de vinculación
io.on('connection', (socket) => {
  socket.on('start_session', (restaurantId) => {
    if (bots.has(restaurantId)) return; // ya conectado

    const client = new Client({
      authStrategy: new LocalAuth({ clientId: restaurantId }),
      puppeteer: { headless: true, args: ['--no-sandbox'] }
    });

    // 2. Genera y envía el QR al panel del restaurante
    client.on('qr', (qr) => {
      socket.emit('qr', qr); // Panel muestra el QR
    });

    // 3. Restaurante escanea → sesión activa
    client.on('ready', () => {
      bots.set(restaurantId, client);
      socket.emit('connected', { phone: client.info.wid.user });
    });

    // 4. Procesa cada mensaje del cliente
    client.on('message', async (msg) => {
      const restaurant = await db.getRestaurant(restaurantId);
      const reply = await botEngine.process(msg.body, restaurant);

      if (reply) await msg.reply(reply.text);

      // 5. Notifica al panel en tiempo real
      io.to(restaurantId).emit('new_message', {
        from: msg.from, body: msg.body,
        order: reply?.order || null
      });
    });

    client.initialize();
  });
});