package de.ph87.data.series;

import de.ph87.data.*;
import de.ph87.data.unit.*;
import lombok.*;
import lombok.extern.slf4j.*;
import org.springframework.stereotype.*;
import org.springframework.transaction.annotation.*;

import java.util.function.*;

@Slf4j
@Service
@Transactional
@RequiredArgsConstructor
public class SeriesService {
  
  private final SeriesRepository seriesRepository;
  
  @SuppressWarnings("unused")
  public SeriesDto modify(final long id, @NonNull final Consumer<Series> modifier) {
    final Series series = getById(id);
    modifier.accept(series);
    return publish(series, Action.CHANGED);
  }
  
  @SuppressWarnings("unused")
  public void delete(final long id) {
    final Series series = getById(id);
    seriesRepository.delete(series);
    publish(series, Action.DELETED);
  }
  
  private Series getById(final long id) {
    return seriesRepository.findById(id).orElseThrow();
  }
  
  public SeriesDto getDtoById(final long id) {
    return toDto(getById(id));
  }
  
  private SeriesDto publish(@NonNull final Series series, @NonNull final Action action) {
    final SeriesDto dto = toDto(series);
    log.info("Series {}: {}", action, series);
    return dto;
  }
  
  private SeriesDto toDto(@NonNull final Series series) {
    return new SeriesDto(series);
  }
  
  public Series getOrCreate(@NonNull final String name, @NonNull final Unit unit) {
    return seriesRepository
      .findByName(name)
      .orElseGet(() -> {
        final Series series = seriesRepository.save(new Series(name, unit));
        publish(series, Action.CREATED);
        return series;
      });
  }
  
}