Mengintegrasikan Stockfish engine untuk mode catur vs bot

Dockerfile

@@ -2,7 +2,7 @@ FROM node:lts-bookworm-slim
 
 RUN apt-get update && \
   apt-get upgrade -y && \
-  apt-get install -y --no-install-recommends ffmpeg && \
+  apt-get install -y --no-install-recommends ffmpeg stockfish && \
   rm -rf /var/lib/apt/lists/*
 
 WORKDIR /app

chess-engine/stockfish.js

@@ -0,0 +1,69 @@
+import { spawn, execSync } from 'child_process';
+
+export const DIFFICULTY_MAP = {
+	'beginner': 0, 'easy': 2, 'middle': 5, 'hard': 8,
+	'advanced': 10, 'expert': 12, 'candidate': 14,
+	'master': 16, 'grandmaster': 18, 'champion': 20
+};
+
+const STOCKFISH_PATHS = [
+	'stockfish',
+	'/usr/bin/stockfish',
+	'/usr/games/stockfish',
+	'/usr/local/bin/stockfish',
+	'/data/data/com.termux/files/usr/bin/stockfish',
+	'/opt/homebrew/bin/stockfish',
+];
+
+function findStockfish() {
+	for (const path of STOCKFISH_PATHS) {
+		try {
+			execSync(`"${path}" uci`, { timeout: 2000, stdio: 'pipe' });
+			return path;
+		} catch (_) {}
+	}
+	return null;
+}
+
+const STOCKFISH_BIN = findStockfish();
+
+export function getStockfishMove(fen, skillLevel = 0) {
+	return new Promise((resolve, reject) => {
+		if (!STOCKFISH_BIN) return reject(new Error('Stockfish tidak ditemukan'));
+		const engine = spawn(STOCKFISH_BIN);
+		let resolved = false;
+		const timeout = setTimeout(() => {
+			if (!resolved) { resolved = true; engine.kill(); reject(new Error('stockfish timeout')); }
+		}, 8000);
+		let buffer = '';
+		engine.stdout.on('data', (data) => {
+			buffer += data.toString();
+			const lines = buffer.split('\n');
+			buffer = lines.pop();
+			for (const line of lines) {
+				if (line.startsWith('bestmove') && !resolved) {
+					resolved = true;
+					clearTimeout(timeout);
+					engine.kill();
+					const move = line.trim().split(' ')[1];
+					resolve(move && move !== '(none)' ? move : null);
+				}
+			}
+		});
+		engine.stderr.on('data', (data) => {
+			if (!resolved) {
+				resolved = true;
+				clearTimeout(timeout);
+				engine.kill();
+				reject(new Error(data.toString().trim()));
+			}
+		});
+		engine.on('error', (err) => { if (!resolved) { resolved = true; clearTimeout(timeout); reject(err); } });
+		const moveTime = 50 + skillLevel * 30;
+		engine.stdin.write('uci\n');
+		engine.stdin.write(`setoption name Skill Level value ${skillLevel}\n`);
+		engine.stdin.write('ucinewgame\n');
+		engine.stdin.write(`position fen ${fen}\n`);
+		engine.stdin.write(`go movetime ${moveTime}\n`);
+	});
+}