added computer mode

backend/chessbot.js

@@ -6,16 +6,22 @@ const engine = new Engine(
         "C:\\Users\\MOON\\Downloads\\stockfish-windows-x86-64-avx2\\stockfish\\stockfish-windows-x86-64-avx2.exe"
 );
 
-engine.init().then(() => {
-    nextMove({ position: "r1bqkbnr/pppp1ppp/2n5/1B2p3/4P3/5N2/PPPP1PPP/RNBQK2R b KQkq - 3 3" });
-});
+engine
+    .init()
+    .then((eng) => {
+        return eng.setoption("UCI_LimitStrength", true);
+    })
+    .then((eng) => {
+        eng.setoption("UCI_Elo");
+    });
 
 const nextMove = async ({ position }) => {
     await engine.isready();
     console.log("Chess engine ready");
     engine.position(position);
-    const result = await engine.go({ depth: 22 });
+    const result = await engine.go({ depth: 10 });
     console.log("Best move or position", position, "is", result.bestmove);
+    return result.bestmove;
 };
 
-module.exports = {};
+module.exports = { nextMove };

backend/socket.js

@@ -3,6 +3,7 @@ const { SOCKET_EVENTS } = require("./constants");
 const { Chess } = require("chess.js");
 const { User } = require("./models/user");
 const { Game } = require("./models/game");
+const { nextMove } = require("./chessbot");
 const {
     CHESS_MOVE,
     CHESS_OPPONENT_MOVE,
@@ -61,6 +62,33 @@ function socketIOServerInit(server) {
         },
     });
 
+    const ioBot = io.of("/chessbot");
+
+    ioBot.on("connection", (socket) => {
+        let id = socket.id;
+        console.log(id, "connected on /chessbot");
+        const chess = new Chess();
+
+        socket.onAny((evt) => {
+            console.log(evt);
+        });
+
+        socket.on("disconnect", (reason) => {
+            console.log(id, "disconnected due to", reason);
+        });
+
+        socket.on(CHESS_MOVE, async (roomID, moveData) => {
+            console.log("CHESS_MOVE");
+            chess.move(moveData);
+            let move = moveData.from + moveData.to;
+            console.log(move);
+            const botMove = await nextMove({ position: chess.fen() });
+            console.log({ from: botMove.substring(0, 2), to: botMove.substring(2) });
+            chess.move({ from: botMove.substring(0, 2), to: botMove.substring(2) });
+            socket.emit("CHESS_BOT_MOVE", { from: botMove.substring(0, 2), to: botMove.substring(2) });
+        });
+    });
+
     io.on("connection", (socket) => {
         let id = socket.id;
         console.log(socket.id, "connected");