package de.ph87.homeautomation.channel;

import de.ph87.homeautomation.property.Property;
import de.ph87.homeautomation.property.PropertyReadService;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.boot.context.event.ApplicationStartedEvent;
import org.springframework.context.event.EventListener;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.List;
import java.util.Optional;

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

  private final List<IChannelOwner> channelOwners;

  private final PropertyReadService propertyReadService;

  @EventListener(ApplicationStartedEvent.class)
  public void readAllPropertyChannels() {
    propertyReadService.findAllByReadChannelNotNull().forEach(property -> {
      final Optional<IChannelOwner> ownerOptional = findByChannel(property.getReadChannel());
      if (ownerOptional.isPresent()) {
        ownerOptional.get().read(property.getReadChannel());
      } else {
        log.error("No Owner for Property: {}", property);
      }
    });
  }

  public Optional<IChannelOwner> findByChannel(final Channel channel) {
    return channelOwners.stream().filter(owner -> channel.getChannelOwnerClass().isInstance(owner)).findFirst();
  }

  public IChannelOwner getByChannel(final Channel channel) {
    return findByChannel(channel).orElseThrow(RuntimeException::new);
  }

  public void write(final Property property, final double value) {
    final Channel channel = property.getWriteChannel();
    if (channel == null) {
      return;
    }
    getByChannel(channel).write(property.getWriteChannel(), value);
  }

}