package ru.ulstu.conference.service;

import org.apache.commons.lang3.StringUtils;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import ru.ulstu.conference.model.Conference;
import ru.ulstu.conference.model.ConferenceDto;
import ru.ulstu.conference.repository.ConferenceRepository;
import ru.ulstu.deadline.service.DeadlineService;

import java.io.IOException;
import java.util.List;

import static org.springframework.util.ObjectUtils.isEmpty;
import static ru.ulstu.core.util.StreamApiUtils.convert;

@Service
public class ConferenceService {
    private final static int MAX_DISPLAY_SIZE = 40;

    private final ConferenceRepository conferenceRepository;
    private final DeadlineService deadlineService;

    public ConferenceService(ConferenceRepository conferenceRepository,
                             DeadlineService deadlineService) {
        this.conferenceRepository = conferenceRepository;
        this.deadlineService = deadlineService;
    }

    public List<Conference> findAll() {
        return conferenceRepository.findAll();
    }

    public List<ConferenceDto> findAllDto() {
        List<ConferenceDto> conferences = convert(findAll(), ConferenceDto::new);
        conferences.forEach(conferenceDto -> conferenceDto.setTitle(StringUtils.abbreviate(conferenceDto.getTitle(), MAX_DISPLAY_SIZE)));
        return conferences;
    }

    public ConferenceDto findOneDto(Integer id) {
        return new ConferenceDto(conferenceRepository.findOne(id));
    }

    public void save(ConferenceDto conferenceDto) throws IOException {
        if (isEmpty(conferenceDto.getId())) {
            create(conferenceDto);
        } else {
            update(conferenceDto);
        }
    }

    @Transactional
    public Integer create(ConferenceDto conferenceDto) throws IOException {
        Conference newConference = copyFromDto(new Conference(), conferenceDto);
        newConference = conferenceRepository.save(newConference);


        return newConference.getId();
    }

    @Transactional
    public Integer update(ConferenceDto conferenceDto) throws IOException {
        Conference conference = conferenceRepository.findOne(conferenceDto.getId());

        conferenceRepository.save(copyFromDto(conference, conferenceDto));

        return conference.getId();
    }

    private Conference copyFromDto(Conference conference, ConferenceDto conferenceDto) throws IOException {
        conference.setTitle(conferenceDto.getTitle());
        conference.setDescription(conferenceDto.getDescription());
        conference.setUrl(conferenceDto.getUrl());
        conference.setPing(0);
        conference.setBeginDate(conference.getBeginDate());
        conference.setEndDate(conference.getEndDate());

        conference.setDeadlines(deadlineService.saveOrCreate(conferenceDto.getDeadlines()));

        return conference;
    }


}