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

const root = __dirname;
const port = Number(process.env.PORT || 5173);

const contentTypes = {
  ".html": "text/html; charset=utf-8",
  ".css": "text/css; charset=utf-8",
  ".js": "text/javascript; charset=utf-8",
  ".json": "application/json; charset=utf-8",
};

const server = http.createServer((request, response) => {
  const urlPath = getUrlPath(request.url);
  const requestedPath = urlPath === "/" ? "/index.html" : urlPath;
  const filePath = path.resolve(root, `.${requestedPath}`);

  if (!filePath.startsWith(root)) {
    response.writeHead(403);
    response.end("Forbidden");
    return;
  }

  fs.readFile(filePath, (error, data) => {
    if (error) {
      response.writeHead(404);
      response.end("Not found");
      return;
    }

    response.writeHead(200, {
      "Content-Type": contentTypes[path.extname(filePath)] || "application/octet-stream",
    });
    response.end(data);
  });
});

server.listen(port, () => {
  console.log(`Media Tracker running at http://localhost:${port}`);
});

function getUrlPath(value) {
  try {
    return decodeURIComponent(new URL(value, "http://localhost").pathname);
  } catch (error) {
    return "/";
  }
}