package ru.ulstu.meeting;

import jakarta.transaction.Transactional;
import jakarta.validation.constraints.NotNull;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Service;
import ru.ulstu.news.model.News;
import ru.ulstu.news.service.NewsService;

@Service
public class MeetingService {
    private final MeetingRepository meetingRepository;
    private final NewsService newsService;

    public MeetingService(MeetingRepository meetingRepository,
                          NewsService newsService) {
        this.meetingRepository = meetingRepository;
        this.newsService = newsService;
    }

    @Transactional
    public Meeting create(Meeting meeting) {
        meeting = meetingRepository.save(meeting);
        News news = newsService.create("Объявление о заседании семинара", meeting);
        meeting.setNews(news);
        return save(meeting);
    }

    public Meeting save(Meeting meeting) {
        if (meeting.getNewsId() != null) {
            meeting.setNews(newsService.getById(meeting.getNewsId()));
        }
        return (meeting.getId() != null && (meeting.getId() != 0))
                ? meetingRepository.save(meeting)
                : create(meeting);
    }

    public Meeting getById(@NotNull Integer id) {
        return meetingRepository
                .findById(id)
                .orElseThrow(() -> new RuntimeException("Запись о заседании не найдена"));
    }

    @Transactional
    public void delete(Integer id) {
        Meeting meeting = meetingRepository.getById(id);
        if (meeting.getNews() != null) {
            newsService.delete(meeting.getNews().getId());
        }
        meetingRepository.deleteById(id);
    }

    public Page<Meeting> getMeetings(Pageable pageable) {
        return meetingRepository.findByOrderByDateDesc(pageable);
    }
}