import { Request, Response, NextFunction } from 'express';

declare global {
  // eslint-disable-next-line @typescript-eslint/no-namespace
  namespace Express {
    interface Locals {
      // When the query params contains...
      //
      //   search=foo
      //
      // ... it becomes available as follow in handlers:
      //
      //   'foo'
      search: string | null;
    }
  }
}

function extractSearch(req: Request, res: Response, next: NextFunction) {
  const rawSearch = req.query.search;

  if (typeof rawSearch === 'string') {
    res.locals.search = rawSearch;
  } else {
    res.locals.search = null;
  }

  next();
}

export default extractSearch;