import { createServer } from "node:http";
import { readFile, stat } from "node:fs/promises";
import path from "node:path";
import { fileURLToPath } from "node:url";
const root = path.resolve(
    path.dirname(fileURLToPath(import.meta.url)),
    "..",
    "dist",
  ),
  prefix = "/deep/nested/diagram/",
  types = new Map([
    [".css", "text/css"],
    [".html", "text/html"],
    [".js", "text/javascript"],
    [".json", "application/json"],
    [".webmanifest", "application/manifest+json"],
    [".svg", "image/svg+xml"],
    [".md", "text/markdown"],
    [".txt", "text/plain"],
  ]),
  headers = {
    "Content-Security-Policy":
      "default-src 'self';base-uri 'self';object-src 'none';script-src 'self';style-src 'self' 'unsafe-inline';img-src 'self' data: blob:;connect-src 'self';worker-src 'self' blob:;manifest-src 'self'",
    "Permissions-Policy": "camera=(),microphone=(),geolocation=()",
    "Referrer-Policy": "no-referrer",
    "X-Content-Type-Options": "nosniff",
  };
createServer(async (q, s) => {
  try {
    const u = new URL(q.url ?? "/", "http://x"),
      d = decodeURIComponent(u.pathname),
      r = d.startsWith(prefix) ? d.slice(prefix.length) : d.replace(/^\/+/, ""),
      n = path.posix.normalize(r || "index.html");
    if (n.startsWith("../") || path.isAbsolute(n))
      return void s.writeHead(400).end();
    let f = path.join(root, n);
    if ((await stat(f).catch(() => null))?.isDirectory())
      f = path.join(f, "index.html");
    s.writeHead(200, {
      "Content-Type": types.get(path.extname(f)) ?? "application/octet-stream",
      ...headers,
    });
    s.end(await readFile(f));
  } catch {
    s.writeHead(404).end();
  }
}).listen(4222, "127.0.0.1", () => console.log("ready"));