const app = require("express")();
const httpServer = require("http").createServer(app);
const io = require("socket.io")(httpServer, {});

// 保存在线用户数据
var userOnline = []

io.on("connection", socket => {
  console.log("有一个客户端建立了链接");


  socket.on("login", (res) => {
    console.log(res);
    var isHave =  userOnline.filter((val,index) => {
      return val.username == res.username
    });
    if (isHave.length > 0) {
      socket.emit("UserNameExist");
    } else {
      userOnline.push(res);
      socket.join(res.roomid);
      socket.emit("LoginSuccess");
    }
  });

  socket.on("getUserOnline", (id) => {
    console.log("房间号：",id)
    console.log("UserOnline：",userOnline)
    socket.join(id);
    // socket.emit("UserOnline", userOnline);
    io.in(id).emit("UserOnline", userOnline);
  });

  socket.on("getMessage", (res) => {
    socket.to(res.roomid).emit("sedMessage", res);
  });



});



httpServer.listen(3000);