server.js

const path = require("path");
const express = require("express");
const http = require("http");
const socketio = require("socket.io");
// const { Socket } = require("dgram");
const formatMessage = require("./utils/messages");
const {
  userJoin,
  getCurrentUser,
  userLeave,
  getRoomUsers,
} = require("./utils/users");
const botName = "chatapp bot";
const app = express();
const server = http.createServer(app);
const io = socketio(server, {
  cors: {
    origin: "http://127.0.0.1:5500",
    methods: ["GET", "POST"],
    allowedHeaders: ["my-custom-header"],
    credentials: true,
  },
});
app.use(express.static(path.join(__dirname, "public")));

io.on("connection", (socket) => {
  socket.on("joinRoom", ({ username, room }) => {
    const user = userJoin(socket.id, username, room);
    socket.join(user.room);
    socket.emit("message", formatMessage(botName, "Welcome to the chat app"));

    socket.broadcast
      .to(user.room)
      .emit(
        "message",
        formatMessage(botName, `${user.username} has Joined the chat`)
      );
    io.to(user.room).emit("roomUsers", {
      room: user.room,
      users: getRoomUsers(user.room),
    });
  });
  socket.on("chatMessage", (msg) => {
    const user = getCurrentUser(socket.id);
    // console.log(user);

    io.to(user.room).emit("message", formatMessage(user.username, msg));
  });
  socket.on("disconnect", () => {
    const user = userLeave(socket.id);
    if (user) {
      io.to(user.room).emit(
        "message",
        formatMessage(botName, `${user.username} has left the chat`)
      );
      io.to(user.room).emit("roomUsers", {
        room: user.room,
        users: getRoomUsers(user.room),
      });
    }
  });
});

const port = process.env.PORT || 3000;
server.listen(port, () => console.log(`Server Running on port ${port}`));