source: src/main/java/com/project/beautycenter/service/impl/VraboteniUslugiServiceImpl.java

package com.project.beautycenter.service.impl;

import com.project.beautycenter.model.Uslugi;
import com.project.beautycenter.model.Vraboteni;
import com.project.beautycenter.model.VraboteniUslugi;
import com.project.beautycenter.repository.UslugiRepository;
import com.project.beautycenter.repository.VraboteniRepository;
import com.project.beautycenter.repository.VraboteniUslugiRepository;
import com.project.beautycenter.service.VraboteniUslugiService;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;

@Service
public class VraboteniUslugiServiceImpl implements VraboteniUslugiService {

    private final VraboteniUslugiRepository repository;
    private final UslugiRepository uslugiRepository;
    private final VraboteniRepository vraboteniRepository;

    public VraboteniUslugiServiceImpl(VraboteniUslugiRepository repository, UslugiRepository uslugiRepository, VraboteniRepository vraboteniRepository) {
        this.repository = repository;
        this.uslugiRepository = uslugiRepository;
        this.vraboteniRepository = vraboteniRepository;
    }

    @Override
    public List<VraboteniUslugi> listAll() {
        return this.repository.findAll();
    }

    @Override
    public List<VraboteniUslugi> listByUsluga(Uslugi u) {
        return this.repository.findAllByUsluga(u);
    }

    @Override
    public List<VraboteniUslugi> deletebyUsluga(String id) {
        Uslugi uslugi = this.uslugiRepository.getById(id);
        List<VraboteniUslugi> vraboteniUslugi = this.repository.findAllByUsluga(uslugi);
        for (var i = 0; i < vraboteniUslugi.size(); i++) {
            this.repository.delete(vraboteniUslugi.get(i));
        }
        return vraboteniUslugi;
    }

    public List<Vraboteni> getVraboteniByUsluga(Uslugi usluga) {
        List<VraboteniUslugi> vrabUsluga = this.repository.findAllByUsluga(usluga);
        List<Vraboteni> vraboteni = this.vraboteniRepository.findAll();

        List<Vraboteni> listOutput = new ArrayList<>();
        for (var i = 0; i < vrabUsluga.size(); i++) {
            for (var j = 0; j < vraboteni.size(); j++) {
                if (vrabUsluga.get(i).getUserIdVraboten() == vraboteni.get(j))
                    listOutput.add(vrabUsluga.get(i).getUserIdVraboten());
            }
        }
        return listOutput;
    }

}