import path from "path";
import fs from "fs";

import { CONF_DIR } from "utils/config/config";
import createLogger from "utils/logger";

const logger = createLogger("configFileService");

/**
 * @param {import("next").NextApiRequest} req
 * @param {import("next").NextApiResponse} res
 */
export default async function handler(req, res) {
  const { path: relativePath } = req.query;

  // only two supported files, for now
  if (!['custom.css', 'custom.js'].includes(relativePath))
  {
    return res.status(422).end('Unsupported file');
  }

  const filePath = path.join(CONF_DIR, relativePath);

  try {
      // Read the content of the file or return empty content
      const fileContent = fs.existsSync(filePath) ? fs.readFileSync(filePath, 'utf-8') : '';
      // hard-coded since we only support two known files for now
      const mimeType = (relativePath === 'custom.css') ? 'text/css' : 'text/javascript';
      res.setHeader('Content-Type', mimeType);
      return res.status(200).send(fileContent);
    } catch (error) {
      logger.error(error);
      return res.status(500).end('Internal Server Error');
    }
}