middlerware.js

import { NextResponse } from 'next/server';

export function middleware(request) {
  const cookie = request.cookies.get('group')
  if (group===1) {
     const url = request.nextUrl.clone()
    url.pathname = '/offer-1'
    return NextResponse.rewrite(url)
  }
  if (group===2) {
     const url = request.nextUrl.clone()
    url.pathname = '/offer-2'
    return NextResponse.rewrite(url)
  }
  if (group===3) {
     const url = request.nextUrl.clone()
    url.pathname = '/offer-3'
    return NextResponse.rewrite(url)
  }
  if (group===4) {
     const url = request.nextUrl.clone()
    url.pathname = '/offer-4'
    return NextResponse.rewrite(url)
  }

  //User with no cookie will get default homepage
  return NextResponse.next();
}

export const config = {
  matcher: '/',
};