import { createReadStream, existsSync, statSync } from "node:fs";
import { createServer } from "node:http";
import { extname, join, normalize } from "node:path";
import { fileURLToPath } from "node:url";

const root = join(fileURLToPath(new URL(".", import.meta.url)), "dist");
const port = Number(process.env.PORT || 7860);

const contentTypes = {
  ".css": "text/css; charset=utf-8",
  ".html": "text/html; charset=utf-8",
  ".js": "application/javascript; charset=utf-8",
  ".json": "application/json; charset=utf-8",
  ".map": "application/json; charset=utf-8",
  ".svg": "image/svg+xml",
  ".wasm": "application/wasm",
};

function resolvePath(urlPath) {
  const decoded = decodeURIComponent(urlPath.split("?")[0] || "/");
  const clean = normalize(decoded).replace(/^(\.\.[/\\])+/, "");
  const candidate = join(root, clean);
  if (existsSync(candidate) && statSync(candidate).isFile()) {
    return candidate;
  }
  return join(root, "index.html");
}

const server = createServer((request, response) => {
  const filePath = resolvePath(request.url || "/");
  const type = contentTypes[extname(filePath)] || "application/octet-stream";

  response.setHeader("content-type", type);
  response.setHeader("cross-origin-opener-policy", "same-origin");
  response.setHeader("cross-origin-embedder-policy", "credentialless");
  response.setHeader("cross-origin-resource-policy", "cross-origin");
  response.setHeader("cache-control", filePath.endsWith("index.html") ? "no-store" : "public, max-age=31536000, immutable");

  createReadStream(filePath).pipe(response);
});

server.listen(port, "0.0.0.0", () => {
  console.log(`Pi CLI Web serving ${root} on ${port}`);
});