// Tiny static file server over client/dist, for the e2e scripts that need
// their OWN port (the app's allowed-origin list only covers 4173/5173, and one
// of them deliberately runs off-allowlist against a stub mailbox).
//
// Replaces the `npx vite --port …` the TypeScript era used: there is no vite in
// this repo any more. Run a build first — this serves the built dist, not source.
//
//   node e2e/serve.mjs <port>
import { createServer } from "node:http";
import { existsSync, readFileSync, statSync } from "node:fs";
import { extname, join, normalize } from "node:path";
import { fileURLToPath } from "node:url";

const DIST = join(fileURLToPath(new URL("..", import.meta.url)), "dist");
const TYPES = {
  ".html": "text/html; charset=utf-8",
  ".js": "text/javascript; charset=utf-8",
  ".css": "text/css; charset=utf-8",
  ".json": "application/json; charset=utf-8",
  ".webmanifest": "application/manifest+json",
  ".png": "image/png",
  ".svg": "image/svg+xml",
};

export function serve(port) {
  const server = createServer((req, res) => {
    const url = new URL(req.url, "http://localhost");
    // strip the leading slash and normalise away any ".." before joining
    let rel = normalize(decodeURIComponent(url.pathname)).replace(/^(\.\.[/\\])+/, "").replace(/^[/\\]+/, "");
    let file = join(DIST, rel);
    if (!file.startsWith(DIST)) {
      res.writeHead(403).end();
      return;
    }
    if (rel === "" || (existsSync(file) && statSync(file).isDirectory())) file = join(file, "index.html");
    if (!existsSync(file)) file = join(DIST, "index.html"); // SPA fallback
    res.writeHead(200, {
      "content-type": TYPES[extname(file)] ?? "application/octet-stream",
      // never let the browser cache between e2e runs
      "cache-control": "no-store",
    });
    res.end(readFileSync(file));
  });
  return new Promise((resolve) => server.listen(port, () => resolve(server)));
}

if (import.meta.url === `file://${process.argv[1]}`) {
  const port = Number(process.argv[2] ?? 5174);
  await serve(port);
  console.log(`serving ${DIST} on http://localhost:${port}`);
}