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

const packagedRoot = join(process.cwd(), "public");
const root = existsSync(join(packagedRoot, "index.html")) ? packagedRoot : join(process.cwd(), "out");
const port = Number(process.env.APP_PORT || 3200);
const mimeTypes = {
  ".css": "text/css; charset=utf-8",
  ".html": "text/html; charset=utf-8",
  ".ico": "image/x-icon",
  ".js": "text/javascript; charset=utf-8",
  ".json": "application/json; charset=utf-8",
  ".png": "image/png",
  ".rsc": "text/x-component",
  ".svg": "image/svg+xml",
  ".webp": "image/webp",
};

createServer((request, response) => {
  const pathname = decodeURIComponent(new URL(request.url || "/", "http://localhost").pathname);
  const relativePath = normalize(pathname).replace(/^([/\\])+/, "");
  let filePath = join(root, relativePath || "index.html");

  if (!filePath.startsWith(root) || !existsSync(filePath)) filePath = join(root, "index.html");
  if (existsSync(filePath) && statSync(filePath).isDirectory()) filePath = join(filePath, "index.html");

  if (!existsSync(filePath)) {
    response.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
    response.end("Not found");
    return;
  }

  response.writeHead(200, {
    "Content-Type": mimeTypes[extname(filePath)] || "application/octet-stream",
    "Cache-Control": filePath.endsWith("index.html") ? "no-cache" : "public, max-age=31536000, immutable",
  });
  if (request.method === "HEAD") response.end();
  else createReadStream(filePath).pipe(response);
}).listen(port, "0.0.0.0", () => {
  console.log(`Pixel bead pattern web listening on ${port}`);
});