Server.js

// Server.js — InfoWiki (Wikipedia REST API only)
const express = require("express");
const path = require("path");

const app = express();
const PORT = process.env.PORT || 3000;

app.use(express.json({ limit: "10mb" }));

// CORS (dev)
app.use((req, res, next) => {
  res.header("Access-Control-Allow-Origin", "*");
  res.header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS");
  res.header("Access-Control-Allow-Headers", "Content-Type, Authorization");
  if (req.method === "OPTIONS") return res.sendStatus(200);
  next();
});

app.use(express.static(path.join(__dirname, "Frontend")));

/* UTILS */
function stripHtml(html) {
  if (!html) return "";
  return html.replace(/<[^>]*>?/gm, " ").replace(/\s+/g, " ").trim();
}

function pick(obj, p, fallback = "") {
  try {
    return p.split(".").reduce((acc, k) => acc?.[k], obj) ?? fallback;
  } catch {
    return fallback;
  }
}

/* WIKIPEDIA REST API */
async function fetchWikiFull(title, lang = "fr") {
  const host = `https://${lang}.wikipedia.org`;

  const summaryRes = await fetch(
    `${host}/api/rest_v1/page/summary/${encodeURIComponent(title)}`
  );

  if (!summaryRes.ok) {
    throw new Error("Page introuvable");
  }

  const summary = await summaryRes.json();

  const htmlRes = await fetch(
    `${host}/api/rest_v1/page/html/${encodeURIComponent(title)}`
  );

  let html = htmlRes.ok ? await htmlRes.text() : "";
  html = html
    .replace(/<link\b[^>]*>/gm, "")
    .replace(/<style\b[^>]*>([\s\S]*?)<\/style>/gm, "");

  return {
    title: summary.title,
    description: summary.description,
    imageUrl: summary.originalimage?.source || summary.thumbnail?.source,
    html,
    fullContent: stripHtml(html),
    url: pick(summary, "content_urls.desktop.page", ""),
    lang
  };
}

/* ROUTE: SEARCH */
app.post("/api/search", async (req, res) => {
  try {
    const { query, lang } = req.body || {};
    if (!query) return res.status(400).json({ message: "query manquant" });

    const data = await fetchWikiFull(query, lang || "fr");
    return res.json(data);
  } catch (e) {
    return res.status(404).json({ message: e.message || "Erreur Wikipedia" });
  }
});

/* HEALTH */
app.get("/api/health", (req, res) => {
  res.json({ status: "ok", timestamp: new Date().toISOString() });
});

/* START */
app.listen(PORT, () => {
  console.log("═══════════════════════════════════════════════");
  console.log(`🚀 InfoWiki sur http://localhost:${PORT}`);
  console.log("✅ Wikipedia REST API activée");
  console.log("✅ Puter AI côté Frontend (gpt-5-nano)");
  console.log("═══════════════════════════════════════════════");
});