Symfony querybuilder subquery using sprintf() and alias - php

Question

I'm trying to make a "complex" (for me) querybuilder. Here is the basic SQL request:
SELECT DISTINCT fif.idfichefrais, fif.idvisiteur, fif.date, fif.nbjustificatifs, fif.montantvalide, fif.datemodif, fif.idetat, montantTotalFraisForfait, montantTotalFraisHorsForfait, libelleFraisHorsForfait
FROM FicheFrais fif
INNER JOIN (SELECT lff.idfichefrais, SUM(frf.montantFraisForfait*lff.quantite) as montantTotalFraisForfait
FROM LigneFraisForfait AS lff
INNER JOIN FraisForfait AS frf ON frf.idfraisforfait = lff.idfraisforfait
GROUP BY lff.idfichefrais) a USING (idfichefrais)
INNER JOIN (SELECT e.idetat, e.libelleEtat
FROM Etat AS e) b USING (idetat)
LEFT JOIN (SELECT lfhf.idfichefrais, SUM(lfhf.montant) as montantTotalFraisHorsForfait, lfhf.libelle as libelleFraisHorsForfait
FROM LigneFraisHorsForfait AS lfhf
GROUP BY lfhf.idfichefrais) c USING (idfichefrais)
WHERE fif.idvisiteur = '?'
AND YEAR(fif.date) ='?'
ORDER BY MONTH(fif.date) ASC;
and here is my querybuilder that I'm trying to accomplish
public function findFicheFraisByIdVisiteurAndAnnee($idvisiteur, $annee): array
{
$qb = $this->getEntityManager()->createQueryBuilder();
$a = $this->getEntityManager()->createQueryBuilder();
$b = $this->getEntityManager()->createQueryBuilder();
$c = $this->getEntityManager()->createQueryBuilder();
$selectFraisForfait = $a->select(array('lff.idfichefrais, SUM(frf.montantFraisForfait*lff.quantite)'))
->from('App:Lignefraisforfait', 'lff')
->innerJoin('App:Fraisforfait', 'frf', Join::WITH, 'frf.idfraisforfait = lff.idfraisforfait')
->groupBy('lff.idfichefrais');
$selectEtat = $b->select(array('e.idetat, e.libelleEtat ad libelleFraisHorsForfait'))
->from('App:Etat', 'e');
$selectFraisHorsForfait = $c->select(array('lfhf.idfichefrais, SUM(lfhf.montant) as montantTotalFraisHorsForfait'))
->from('App:Lignefraishorsforfait','lfhf')
->groupBy('lfhf.idfichefrais');
return $FicheFraisByIdVisiteurAndAnnee = $qb
->select(array('fif.idfichefrais, identity(fif.idvisiteur) as idvisiteur, fif.date, fif.nbjustificatifs, fif.montantvalide, fif.datemodif, identity(fif.idetat) as idetat,montantTotalFraisForfait, montantTotalFraisHorsForfait, libelleFraisHorsForfait'))
->from('App:Fichefrais', 'fif')
->innerJoin('App:Lignefraisforfait', sprintf('($s)selectfraisforfait', $selectFraisForfait->getDQL()), Join::WITH, 'fif.idfichefrais = selectfraisforfait.idfichesfrais')
->innerJoin('App:Etat', sprintf('($s)selectetat', $selectEtat->getDQL()), Join::WITH, 'fif.idetat = selectetat.idetat')
->leftJoin('App:Lignefraishorsforfait', sprintf('($s)selectFraisHorsForfait', $selectFraisHorsForfait->getDQL()), Join::WITH, 'fif.idfichefrais = selectfraishorsforfait.idfichefrais')
->where('fif.idvisiteur = :idvisiteur')
->setParameter('idvisiteur' , $idvisiteur)
->andWhere('YEAR(fif.date) = :annee')
->setParameter('annee', $annee)
->groupBy('fif.idfichefrais')
->groupBy('lfhf.idfichefrais')
->orderBy('MONTH(fif.date)', 'ASC')
->setMaxResults(12)
->getQuery()
->getResult()
;
}