import type { NextApiRequest, NextApiResponse } from 'next';
import Cookies from 'cookies';
import jwt from 'jsonwebtoken';

/**
 * Psuedo Middleware: Verifies the user by their cookie value or their API Key
 * When accessing with API key only certain routes are accessible.
 * @param {NextApiRequest} req - The Next Request
 * @param {NextApiResponse} res - The Next Response.
 * @returns {string}
 */
const verifyUser = (req: NextApiRequest, res: NextApiResponse): string => {
   const cookies = new Cookies(req, res);
   const token = cookies && cookies.get('token');

   const allowedApiRoutes = [
      'GET:/api/keyword',
      'GET:/api/keywords',
      'GET:/api/domains',
      'POST:/api/refresh',
      'POST:/api/cron',
      'POST:/api/notify',
      'POST:/api/searchconsole',
      'GET:/api/searchconsole',
      'GET:/api/insight',
   ];
   const verifiedAPI = req.headers.authorization ? req.headers.authorization.substring('Bearer '.length) === process.env.APIKEY : false;
   const accessingAllowedRoute = req.url && req.method && allowedApiRoutes.includes(`${req.method}:${req.url.replace(/\?(.*)/, '')}`);
   console.log(req.method, req.url);

   let authorized: string = '';
   if (token && process.env.SECRET) {
      jwt.verify(token, process.env.SECRET, (err) => {
         // console.log(err);
         authorized = err ? 'Not authorized' : 'authorized';
      });
   } else if (verifiedAPI && accessingAllowedRoute) {
      authorized = 'authorized';
   } else {
      if (!token) {
         authorized = 'Not authorized';
      }
      if (token && !process.env.SECRET) {
         authorized = 'Token has not been Setup.';
      }
      if (verifiedAPI && !accessingAllowedRoute) {
         authorized = 'This Route cannot be accessed with API.';
      }
      if (req.headers.authorization && !verifiedAPI) {
         authorized = 'Invalid API Key Provided.';
      }
   }

   return authorized;
};

export default verifyUser;