const express = require("express");
const compression = require("compression");
const path = require("path");

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

// Sécurité basique
app.disable("x-powered-by");

// Compression gzip/brotli
app.use(compression());

// Isolation requise pour de meilleures perfs WASM/Workers (Tesseract)
app.use((req, res, next) => {
  res.setHeader("Cross-Origin-Opener-Policy", "same-origin");
  res.setHeader("Cross-Origin-Embedder-Policy", "require-corp");
  res.setHeader("Cross-Origin-Resource-Policy", "same-origin");
  next();
});

// Répertoire statique = dossier courant (contient index.html)
const staticRootDirectory = __dirname;
const nodeModulesDirectory = path.join(__dirname, "node_modules");
const vendorDirectory = path.join(__dirname, "vendor");

app.use(
  express.static(staticRootDirectory, {
    index: "index.html",
    maxAge: "7d",
    etag: true,
    setHeaders(res, filePath) {
      const ext = path.extname(filePath);
      if (ext === ".html") {
        res.setHeader("Cache-Control", "no-cache");
      }
      if (ext === ".wasm") {
        res.setHeader("Content-Type", "application/wasm");
      }
      if (ext === ".js") {
        res.setHeader("Content-Type", "application/javascript; charset=utf-8");
      }
    },
  })
);

// Assets Tesseract.js auto-hébergés pour éviter les erreurs MIME/CDN
app.use(
  "/vendor/tesseract",
  express.static(path.join(nodeModulesDirectory, "tesseract.js/dist"), {
    maxAge: "7d",
    setHeaders(res, filePath) {
      const ext = path.extname(filePath);
      if (ext === ".wasm") res.setHeader("Content-Type", "application/wasm");
      if (ext === ".js") res.setHeader("Content-Type", "application/javascript; charset=utf-8");
    },
  })
);

app.use(
  "/vendor/tesseract-core",
  // Le package tesseract.js-core >=4 place les fichiers à la racine du module (pas de dossier dist)
  express.static(path.join(nodeModulesDirectory, "tesseract.js-core"), {
    maxAge: "7d",
    setHeaders(res, filePath) {
      const ext = path.extname(filePath);
      if (ext === ".wasm") res.setHeader("Content-Type", "application/wasm");
      if (ext === ".js") res.setHeader("Content-Type", "application/javascript; charset=utf-8");
    },
  })
);

// Traineddata (langues) auto-hébergés
app.use(
  "/vendor/tessdata",
  express.static(path.join(vendorDirectory, "tessdata"), {
    maxAge: "30d",
    setHeaders(res, filePath) {
      const ext = path.extname(filePath);
      if (ext === ".gz") res.setHeader("Content-Type", "application/gzip");
      if (ext === ".traineddata") res.setHeader("Content-Type", "application/octet-stream");
    },
  })
);

// Fallback SPA/HTML unique
// Utiliser une regex pour compatibilité avec path-to-regexp (Express 5)
app.get(/.*/, (_req, res) => {
  res.sendFile(path.join(staticRootDirectory, "index.html"));
});

app.listen(port, () => {
  // eslint-disable-next-line no-console
  console.log(`Site statique servi sur http://localhost:${port}`);
});