backend/buisnesslogic/src/main/java/com/plannaplan/services/GroupService.java

package com.plannaplan.services;

import java.util.List;
import java.util.Optional;

import com.plannaplan.entities.Groups;
import com.plannaplan.repositories.GroupRepository;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

@Service
public class GroupService {
    @Autowired
    private GroupRepository repo;

    public GroupService() {
    }

    public Optional<Groups> find(int time, int capacity, String room) {
        return this.repo.find(time, room, capacity);
    }

    public List<Groups> getGroupsByCourse(Long id) {
        return this.repo.getByCourse(id);
    }

    public Groups save(Groups group) {
        this.repo.save(group);
        return group;
    }

    public void delete(Groups groups) {
        this.repo.delete(groups);
    }

    public int getGroupsAmmount() {
        return (int) this.repo.count();
    }

    public Optional<Groups> getGroupById(Long id) {
        return this.repo.findById(id);
    }

    public Optional<Long> findNotExistingGroup(List<Long> ids) {
        for (Long oneId : ids) {
            if (this.repo.existsById(oneId) == false) {
                return Optional.of(oneId);
            }
        }
        return Optional.empty();

    }
}