app.js

import { Server } from "socket.io";
import dotenv from 'dotenv';

dotenv.config();

const PORT = process.env.PORT || 4000;

const io = new Server({
    cors: {
        origin: [
            'https://true-estate-front-umber.vercel.app',
            'https://true-estate-front-git-deploy-mashpotato9s-projects.vercel.app',
            'http://localhost:5173'
        ],
        methods: ["GET", "POST", "OPTIONS"],
        credentials: true,
        allowedHeaders: ["my-custom-header"],
        transports: ['websocket', 'polling']
    },
    allowEIO3: true, 
    path: '/socket.io/'
});

let users = [];

const addUser = (userId, socketId) => {
    const userExist = users.find(user => user.userId === userId);
    if(!userExist) {
        users.push({ userId, socketId });
    }
};

const getUser = (userId) => {
    return users.find(user => user.userId === userId);
};

const removeUser = (socketId) => {
    users = users.filter(user => user.socketId !== socketId);
};

io.on("connection", (socket) => {
    console.log('Client connected from:', socket.handshake.headers.origin);

    socket.on("newUser", (userId) => {
        addUser(userId, socket.id);
    });

    socket.on("sendMessage", ({ receiverId, data }) => {
        const receiver = getUser(receiverId);
        io.to(receiver.socketId).emit("getMessage", data);
    });

    socket.on("disconnect", () => {
        removeUser(socket.id);
    });
});

io.listen(PORT, () => {
    console.log(`Socket server running on port ${PORT}`);
    console.log('CORS origins:', io.options.cors.origin);
});