package de.ph87.data.message.handler;

import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.ObjectMapper;
import de.ph87.data.message.IMessageHandler;
import de.ph87.data.message.Message;
import de.ph87.data.series.SeriesInbound;
import de.ph87.data.series.SeriesService;
import de.ph87.data.unit.Unit;
import lombok.Getter;
import lombok.NonNull;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;

@Slf4j
@Service
@RequiredArgsConstructor
public class SimpleJsonHandler implements IMessageHandler {

  private final ObjectMapper objectMapper;

  private final SeriesService seriesService;

  @Override
  public void handle(@NonNull final Message message) {
    try {
      final Inbound inbound = objectMapper.readValue(message.payload, Inbound.class);
      seriesService.receive(new SeriesInbound(message.topic, inbound.date, inbound.value, inbound.unit));
    } catch (JsonProcessingException e) {
      log.debug("Failed to parse inbound message: topic={}, message={}, error={}", message.topic, message, e.toString());
    }
  }

  @Getter
  @ToString
  private static class Inbound {

    public final ZonedDateTime date;

    public final double value;

    public final Unit unit;

    public Inbound(final long timestamp, final double value, final Unit unit) {
      this.date = ZonedDateTime.ofInstant(Instant.ofEpochSecond(timestamp), ZoneId.systemDefault());
      this.value = value;
      this.unit = unit;
    }

  }

}