Build Atelier 64 chess training app

server/index.js

@@ -0,0 +1,75 @@
+import express from 'express';
+import { Chess } from 'chess.js';
+import { analyzePosition, normalizeOllamaUrl } from './engine.js';
+import path from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+const app = express();
+const port = Number(process.env.PORT || 3000);
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..');
+app.use(express.json({ limit: '32kb' }));
+
+app.get('/api/health', (_req, res) => res.json({ ok: true }));
+
+app.post('/api/analyze', async (req, res) => {
+  try {
+    const chess = new Chess(req.body.fen);
+    if (chess.isGameOver()) return res.json({ lines: [], gameOver: true });
+    const depth = Math.max(8, Math.min(22, Number(req.body.depth) || 16));
+    const raw = await analyzePosition(chess.fen(), depth, 3);
+    const lines = raw.map((line) => {
+      const replay = new Chess(chess.fen());
+      const moves = [];
+      for (const uci of line.pv.slice(0, 8)) {
+        const move = replay.move({ from: uci.slice(0, 2), to: uci.slice(2, 4), promotion: uci[4] || 'q' });
+        if (!move) break;
+        moves.push({ uci, san: move.san });
+      }
+      return { ...line, moves };
+    });
+    res.json({ lines, gameOver: false });
+  } catch (error) {
+    res.status(400).json({ error: error.message || 'Analyse impossible' });
+  }
+});
+
+app.post('/api/ollama/test', async (req, res) => {
+  try {
+    const base = normalizeOllamaUrl(req.body.url);
+    const response = await fetch(`${base}/api/tags`, { signal: AbortSignal.timeout(7000) });
+    if (!response.ok) throw new Error(`Ollama répond ${response.status}`);
+    const data = await response.json();
+    res.json({ ok: true, models: (data.models || []).map((m) => m.name) });
+  } catch (error) {
+    res.status(502).json({ error: error.message || 'Connexion Ollama impossible' });
+  }
+});
+
+app.post('/api/explain', async (req, res) => {
+  try {
+    const base = normalizeOllamaUrl(req.body.url);
+    const { fen, lines, model = 'qwen3:8b', lastMove } = req.body;
+    new Chess(fen);
+    const prompt = `Tu es un entraîneur d'échecs francophone précis et encourageant. Position FEN: ${fen}. Dernier coup: ${lastMove || 'début de position'}. Variantes Stockfish: ${JSON.stringify(lines)}. Explique en français le meilleur coup, son idée tactique ou stratégique, la menace, et un piège à éviter. 120 mots maximum. N'invente aucune variante hors des données. Utilise texte simple, sans markdown.`;
+    const response = await fetch(`${base}/api/chat`, {
+      method: 'POST',
+      headers: { 'Content-Type': 'application/json' },
+      body: JSON.stringify({ model, stream: false, messages: [{ role: 'user', content: prompt }], options: { temperature: 0.25 } }),
+      signal: AbortSignal.timeout(90000),
+    });
+    if (!response.ok) throw new Error(`Ollama répond ${response.status}`);
+    const data = await response.json();
+    res.json({ explanation: data.message?.content?.replace(/<think>[\s\S]*?<\/think>/g, '').trim() || 'Aucune explication reçue.' });
+  } catch (error) {
+    res.status(502).json({ error: error.message || 'Explication impossible' });
+  }
+});
+
+app.use(express.static(path.join(root, 'dist')));
+app.use((_req, res) => res.sendFile(path.join(root, 'dist', 'index.html')));
+
+if (process.argv[1] === fileURLToPath(import.meta.url)) {
+  app.listen(port, () => console.log(`Atelier 64 écoute sur :${port}`));
+}
+
+export default app;