package de.ph87.data.message.handler;

import com.fasterxml.jackson.databind.*;
import de.ph87.data.message.*;
import de.ph87.data.meter.*;
import de.ph87.data.series.entry.*;
import de.ph87.data.value.Value;
import de.ph87.data.value.*;
import lombok.*;
import lombok.extern.slf4j.*;
import org.springframework.stereotype.*;

import java.time.*;

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

  private static final String METER_NUMBER = "1ZPA0020300305";

  private final ObjectMapper objectMapper;

  private final EntryService entryService;

  private final MeterService meterService;

  @Override
  public void handle(@NonNull final Message message) throws Exception {
    if (!"electricity/grid/json".equals(message.topic)) {
      return;
    }
    final Inbound inbound = objectMapper.readValue(message.payload, Inbound.class);
    entryService.receive("power/balance", inbound.date, inbound.powerBalance.as(Unit.POWER_W));
    meterService.receive("energy/purchased", METER_NUMBER, inbound.date, inbound.energyPurchased);
    meterService.receive("energy/delivered", METER_NUMBER, inbound.date, inbound.energyDelivered);
  }

  @Getter
  @ToString
  public static class Inbound {

    @NonNull
    public final ZonedDateTime date;

    public final Value energyPurchased;

    public final Value energyDelivered;

    public final Value powerBalance;

    public Inbound(final long timestamp, final double purchaseWh, final double deliveryWh, final double powerW) {
      this.date = ZonedDateTime.ofInstant(Instant.ofEpochSecond(timestamp), ZoneId.systemDefault());
      this.energyPurchased = new Value(purchaseWh, Unit.ENERGY_WH).as(Unit.ENERGY_KWH);
      this.energyDelivered = new Value(deliveryWh, Unit.ENERGY_WH).as(Unit.ENERGY_KWH);
      this.powerBalance = new Value(powerW, Unit.POWER_W);
    }

  }

}