server.js

const { createServer } = require("http");
const next = require("next");
const { Server } = require("socket.io");

const dev = process.env.NODE_ENV !== "production";
const app = next({ dev });
const handle = app.getRequestHandler();

let waitingUser = null;

app.prepare().then(() => {
  const httpServer = createServer((req, res) => {
    handle(req, res);
  });

  const io = new Server(httpServer);

  io.on("connection", (socket) => {
    console.log("User connected:", socket.id);

    socket.on("find_match", () => {
      if (!waitingUser) {
        waitingUser = socket;
        socket.emit("waiting");
      } else {
        const roomId = `room_${waitingUser.id}_${socket.id}`;

        socket.join(roomId);
        waitingUser.join(roomId);

        io.to(roomId).emit("matched", {
          roomId,
          users: [waitingUser.id, socket.id],
        });

        waitingUser = null;
      }
    });

    socket.on("disconnect", () => {
      if (waitingUser?.id === socket.id) {
        waitingUser = null;
      }
      console.log("User disconnected:", socket.id);
    });
  });

  httpServer.listen(3000, () => {
    console.log("🚀 Server running at http://localhost:3000");
  });
});