QuickChess/server.js

const { Board } = require('./src/backend');

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

const port = process.env.PORT || 4001;

const app = express();

const server = http.createServer(app);

const io = socketIo(server, {
  cors: {
    cors: true,
  }
});

let interval;

let games = new Map();

io.on("connection", (socket) => {
  console.log("New client connected");
  if (interval) {
    clearInterval(interval);
  }
  //interval = setInterval(() => getApiAndEmit(socket), 5000);
  socket.on("disconnect", () => {
    console.log("Client disconnected");
    clearInterval(interval);
  });

  socket.on("find", key => {
    key = key?.toLowerCase()
    console.log(`Finding game '${key}'`);
    let game = games.get(key);
    if(game) {
      console.log(`Found game '${key}'`);
      game.sockets.push(socket);
    } else {
      game = {
        sockets: [socket],
        board: new Board(),
        moveDate: null,
      };
      console.log(`Created game '${key}'`);
    }
    games.set(key, game);
    getApiAndEmit(socket, game.board);
  });

  socket.on("move", (key, move) => {
    console.log(`Received move at '${key}'`);
    let game = games.get(key);
    if(move && game.board.makeMove(move.from, move.to) === 0) {
      games.set(key, game);
      for (const s of game.sockets) {
        getApiAndEmit(s, game.board);
      }
    }
  });
});

const getApiAndEmit = (socket, board) => {
  const response = board.textFromState();
  console.log(response);
  // Emitting a new message. Will be consumed by the client
  socket.emit("FromAPI", response);
};

server.listen(port, () => console.log(`Listening on port ${port}`));