package de.ph87.homeautomation.schedule;

import de.ph87.homeautomation.property.PropertyWriteService;
import de.ph87.homeautomation.schedule.entry.ScheduleEntry;
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.Comparator;

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

  private final ScheduleReadService scheduleReadService;

  private final ScheduleCalculationService scheduleCalculationService;

  private final PropertyWriteService propertyWriteService;

  public void executeAllLastDue() {
    final ZonedDateTime now = ZonedDateTime.now();
    scheduleReadService.findAll().forEach(schedule -> executeLastDue(schedule, now));
  }

  private void executeLastDue(final Schedule schedule, final ZonedDateTime now) {
    if (schedule.getProperty() == null) {
      log.error("Cannot execute Schedule {}: No property set!", schedule);
      return;
    }
    schedule.getEntries().stream()
      .filter(entry -> entry.getNextFuzzyTimestamp() != null && !entry.getNextFuzzyTimestamp().isAfter(now))
      .max(Comparator.comparing(ScheduleEntry::getNextFuzzyTimestamp))
      .ifPresent(entry -> executeEntry(schedule, entry, now));
  }

  private void executeEntry(final Schedule schedule, final ScheduleEntry entry, final ZonedDateTime now) {
    entry.setLastClearTimestamp(entry.getNextClearTimestamp());
    log.info("Executing Schedule \"{}\" Entry {}", schedule.getTitle(), entry);
    propertyWriteService.write(schedule.getProperty(), entry.getValue());
    scheduleCalculationService.calculateSchedule(schedule, now);
  }

}