import type { IncomingMessage } from 'http';

import type { NextServer, RequestHandler } from 'next/dist/server/next';

type Crowi = {
  nextApp: NextServer,
}

type CrowiReq = IncomingMessage & {
  crowi: Crowi,
}

type NextDelegatorResult = {
  delegateToNext: RequestHandler,
};

const delegator = (crowi: Crowi): NextDelegatorResult => {

  const { nextApp } = crowi;
  const handle = nextApp.getRequestHandler();

  const delegateToNext: RequestHandler = (req: CrowiReq, res): Promise<void> => {
    req.crowi = crowi;
    return handle(req, res);
  };

  return {
    delegateToNext,
  };

};

export default delegator;