package de.ph87.homeautomation.schedule;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.ZonedDateTime;
import java.util.function.BiConsumer;

@Slf4j
@Service
@Transactional
@RequiredArgsConstructor
public class ScheduleWriteService {

  public static final String NAME_PREFIX = "Neu ";

  private final ScheduleReadService scheduleReadService;

  private final ScheduleCalculationService scheduleCalculationService;

  private final ScheduleMapper scheduleMapper;

  private final ScheduleRepository scheduleRepository;

  public <T> ScheduleDto set(final long id, final BiConsumer<Schedule, T> setter, final T value) {
    final Schedule schedule = scheduleReadService.getById(id);
    setter.accept(schedule, value);
    scheduleCalculationService.calculateSchedule(schedule, ZonedDateTime.now());
    return scheduleMapper.toDto(schedule);
  }

  public ScheduleDto create() {
    final Schedule entry = new Schedule();
    entry.setName(generateUnusedName());
    return scheduleMapper.toDto(scheduleRepository.save(entry));
  }

  private String generateUnusedName() {
    int index = 0;
    String name = null;
    while (name == null || scheduleRepository.existsByName(name)) {
      name = ScheduleWriteService.NAME_PREFIX + ++index;
    }
    return name;
  }

  public void delete(final long id) {
    scheduleRepository.deleteById(id);
  }

}