Build Atelier 64 chess training app

server/engine.js

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+import { spawn } from 'node:child_process';
+
+export function parseInfo(line) {
+  if (!line.startsWith('info ') || !line.includes(' pv ')) return null;
+  const depth = Number(line.match(/\bdepth (\d+)/)?.[1] || 0);
+  const multipv = Number(line.match(/\bmultipv (\d+)/)?.[1] || 1);
+  const scoreMatch = line.match(/\bscore (cp|mate) (-?\d+)/);
+  const pv = line.split(' pv ')[1]?.trim().split(/\s+/) || [];
+  if (!scoreMatch || !pv.length) return null;
+  return {
+    depth,
+    multipv,
+    score: { type: scoreMatch[1], value: Number(scoreMatch[2]) },
+    pv,
+  };
+}
+
+export function normalizeOllamaUrl(value) {
+  const url = new URL(value);
+  if (!['http:', 'https:'].includes(url.protocol)) throw new Error('Adresse Ollama invalide');
+  return url.origin + url.pathname.replace(/\/$/, '');
+}
+
+export function analyzePosition(fen, depth = 16, multiPv = 3) {
+  return new Promise((resolve, reject) => {
+    const binary = process.env.STOCKFISH_PATH || (process.platform === 'win32' ? 'stockfish' : '/usr/games/stockfish');
+    const engine = spawn(binary, [], { stdio: ['pipe', 'pipe', 'pipe'] });
+    const lines = new Map();
+    let buffer = '';
+    const timeout = setTimeout(() => finish(new Error('Analyse Stockfish expirée')), 25000);
+
+    function finish(error) {
+      clearTimeout(timeout);
+      if (!engine.killed) engine.kill();
+      if (error) reject(error);
+      else resolve([...lines.values()].sort((a, b) => a.multipv - b.multipv));
+    }
+
+    engine.on('error', finish);
+    engine.stderr.on('data', () => {});
+    engine.stdout.on('data', (chunk) => {
+      buffer += chunk.toString();
+      const rows = buffer.split(/\r?\n/);
+      buffer = rows.pop() || '';
+      for (const row of rows) {
+        const parsed = parseInfo(row);
+        if (parsed && parsed.depth >= depth - 1) lines.set(parsed.multipv, parsed);
+        if (row.startsWith('bestmove')) finish(lines.size ? null : new Error('Stockfish sans résultat'));
+      }
+    });
+    engine.stdin.write('uci\n');
+    engine.stdin.write(`setoption name MultiPV value ${multiPv}\n`);
+    engine.stdin.write(`position fen ${fen}\n`);
+    engine.stdin.write(`go depth ${depth}\n`);
+  });
+}