// server.js
const express = require('express');
const http = require('http');
const socketIo = require('socket.io');

const app = express();
const server = http.createServer(app);
const io = socketIo(server);

let clients = {};

io.on('connection', (socket) => {
    console.log('A client connected:', socket.id);
    clients[socket.id] = { status: 'connected' };

    socket.on('disconnect', () => {
        console.log('A client disconnected:', socket.id);
        clients[socket.id] = { status: 'disconnected' };
    });

    // 定时发送客户端状态
    setInterval(() => {
        io.emit('clients_status', clients);
    }, 5000);
});

server.listen(3000, () => {
    console.log('Server listening on port 3000');
});