/**
 * Minimal static server for the production build (dist/).
 * Zero dependencies. SPA fallback to index.html.
 * Binds 0.0.0.0 so the office is viewable from the LAN;
 * the transcript watcher stays localhost-only.
 */
import { createServer } from "node:http";
import { promises as fs } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";

const PORT = Number(process.env.PORT || 5182);
const ROOT = path.join(path.dirname(fileURLToPath(import.meta.url)), "..", "dist");

const MIME = {
  ".html": "text/html; charset=utf-8",
  ".js": "text/javascript",
  ".css": "text/css",
  ".svg": "image/svg+xml",
  ".png": "image/png",
  ".ico": "image/x-icon",
  ".json": "application/json",
  ".woff2": "font/woff2",
  ".map": "application/json",
};

const server = createServer(async (req, res) => {
  try {
    const urlPath = decodeURIComponent((req.url || "/").split("?")[0]);
    let filePath = path.normalize(path.join(ROOT, urlPath));
    if (!filePath.startsWith(ROOT)) {
      res.writeHead(403);
      res.end("forbidden");
      return;
    }
    const stat = await fs.stat(filePath).catch(() => null);
    if (!stat || stat.isDirectory()) {
      filePath = path.join(ROOT, "index.html");
    }
    const ext = path.extname(filePath);
    const data = await fs.readFile(filePath);
    res.writeHead(200, {
      "Content-Type": MIME[ext] || "application/octet-stream",
      "Cache-Control": urlPath.startsWith("/assets/")
        ? "public, max-age=31536000, immutable"
        : "no-cache",
    });
    res.end(data);
  } catch {
    res.writeHead(500);
    res.end("server error");
  }
});

server.listen(PORT, "0.0.0.0", () => {
  console.log(`✳ Codex Office web  http://localhost:${PORT}  (serving dist/)`);
});