const http = require("node:http");
const fs = require("node:fs");
const path = require("node:path");

const PORT = Number.parseInt(process.env.PORT ?? "8080", 10) || 8080;
const INDEX_PATH = path.join(__dirname, "index.html");

const server = http.createServer((req, res) => {
  if (req.method !== "GET") {
    res.writeHead(405, { "Content-Type": "text/plain; charset=utf-8" });
    res.end("Method Not Allowed");
    return;
  }

  if (req.url !== "/" && req.url !== "/index.html") {
    res.writeHead(404, { "Content-Type": "text/plain; charset=utf-8" });
    res.end("Not Found");
    return;
  }

  fs.readFile(INDEX_PATH, (err, data) => {
    if (err) {
      res.writeHead(500, { "Content-Type": "text/plain; charset=utf-8" });
      res.end("Failed to read index.html");
      return;
    }

    res.writeHead(200, {
      "Content-Type": "text/html; charset=utf-8",
      "Cache-Control": "no-store",
    });
    res.end(data);
  });
});

server.listen(PORT, "0.0.0.0", () => {
  // eslint-disable-next-line no-console
  console.log(`Server running on http://0.0.0.0:${PORT}`);
});