Group records using lookup object reference fields in Domain?

[pp1-logitech]

I have a use case to group the accounts with the DNB Company Records(lookup in account)'s Global_Ultimate_DUNS_Number__c and check if the accounts tied via Global DUNS if they are present in more than one country and employee count > 10000 set the Segmentation to "Global" else set it to "Enterprise".

Here's what i tried:
`

    IAccounts accountsWithGlobalDuns =  Accounts.newInstance(accountsWithGlobalDuns);

    Set<Id> dnbIds = globalDUNSAccounts.getDNBIds();

   // gives the dnbrecord id to global duns where dnbid is the id tied to the global ultimate account
    Map<Id, String> gdnbIdToGduns = DnBCompanyRecords.newInstance(
        DnBCompanyRecordsSelector.newInstance().selectById(dnbIds)
    ).getDNBIdByGDUNSWithDUNSSameAsGDUNS(); 

    //gives the dnbrecordid to its global duns association
    Map<Id, String> dnbIdToGduns = DnBCompanyRecords.newInstance(
        DnBCompanyRecordsSelector.newInstance().selectById(dnbIds)
    ).getDNBIdByGDUNS();

   //filters only the globalultimateaccounts
    IAccounts globalUtimateAccounts =  accountsWithGlobalDuns.selectByDNBId(gdnbIdToGduns.keySet());       
    
    Map<String, Decimal> gdunsByCountryCount = accountsWithGlobalDuns.getCountryCountByGDUNS(dnbIdToGduns)

    IAccounts globalUtimateAccountsInMoreThanOneCountry =  globalUtimateAccounts .selectByDnbIdAndGDUNSMoreThanCountryCount(
     1, dnbIdToGduns, gdunsByCountryCount 
    ).selectByEmployeesGreaterThan(10000).setSegmentation('Global');

`
Accounts:

`

         selectByDnbIdAndGDUNSMoreThanCountryCount(Decimal countryCount, Map<Id, String> idToGDUNS, Map<String, Decimal> 
   gdundsToCount) {

            for (Account account : getAccounts){

                if (gdundsToCount.get(idToGDUNS.get(account.Dnb_Company_Record__c)) > countryCount) {
               // add 

            }

            return new Accounts(<list>);

    }

`

I feel like above is very complex. Is there any proper way to do this in fflib? So, can we use lookup field's reference in another domain class?

[ImJohnMDaniel]

G'day @pp1-logitech, it is difficult to say if there is a more streamlined approach with out a look at more of the code. Having said that, there are at least suggestions that I would make:

• You don't need to initialize the domains with specifically executing the selector. Simply supplying the Set to the domain newInstance method should suffice.
• Reuse the same domain since they are the same records