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;

function sendText(res, statusCode, text) {
  res.writeHead(statusCode, { "Content-Type": "text/plain; charset=utf-8" });
  res.end(text);
}

function sendFile(res, filePath, contentType) {
  fs.readFile(filePath, (err, data) => {
    if (err) {
      sendText(res, 500, "Internal Server Error");
      return;
    }
    res.writeHead(200, {
      "Content-Type": contentType,
      "Cache-Control": "no-store",
    });
    res.end(data);
  });
}

const server = http.createServer((req, res) => {
  if (req.method !== "GET") {
    sendText(res, 405, "Method Not Allowed");
    return;
  }

  const url = req.url ?? "/";

  if (url === "/" || url === "/index.html") {
    sendFile(
      res,
      path.join(__dirname, "index.html"),
      "text/html; charset=utf-8",
    );
    return;
  }

  if (url === "/handler.js") {
    sendFile(
      res,
      path.join(__dirname, "handler.js"),
      "text/javascript; charset=utf-8",
    );
    return;
  }

  sendText(res, 404, "Not Found");
});

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