package de.ph87.data.topic.parser;

import com.fasterxml.jackson.annotation.JsonProperty;
import de.ph87.data.series.data.delta.DeltaService;
import de.ph87.data.series.data.varying.VaryingService;
import de.ph87.data.topic.TopicDto;
import de.ph87.data.topic.TopicParserAbstract;
import lombok.NonNull;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;
import tools.jackson.databind.ObjectMapper;

import java.time.LocalDateTime;
import java.time.ZoneId;
import java.time.ZonedDateTime;

@Slf4j
@Service
public class TasmotaSmartMeter extends TopicParserAbstract<TasmotaSmartMeter.Dto> {

  public TasmotaSmartMeter(@NonNull final ObjectMapper mapper, @NonNull final DeltaService deltaService, @NonNull final VaryingService varyingService) {
    super(Dto.class, mapper, deltaService, varyingService);
  }

  @Override
  protected void handle2(final @NonNull TopicDto topic, @NonNull final Dto dto) {
    delta(topic.series0, dto.meter.number, dto.date, dto.meter.purchaseKWh);
    delta(topic.series1, dto.meter.number, dto.date, dto.meter.deliverKWh);
    varying(topic.series2, dto.date, Math.max(0, dto.meter.powerW));
    varying(topic.series3, dto.date, Math.max(0, -dto.meter.powerW));
  }

  public static class Dto {

    @NonNull
    public final ZonedDateTime date;

    @NonNull
    public final Meter meter;

    public Dto(
      @JsonProperty(value = "Time", required = true) @NonNull final String localDateTimeString,
      @JsonProperty(value = "meter", required = true) @NonNull final Meter meter
    ) {
      this.date = ZonedDateTime.of(LocalDateTime.parse(localDateTimeString), ZoneId.systemDefault());
      this.meter = meter;
    }

    public static class Meter {

      @NonNull
      public final String number;

      public final double purchaseKWh;

      public final double deliverKWh;

      public final double powerW;

      public Meter(
        @JsonProperty(value = "number", required = true) @NonNull final String number,
        @JsonProperty(value = "energy_purchased_kwh", required = true) final double purchaseWh,
        @JsonProperty(value = "energy_delivered_kwh", required = true) final double deliverWh,
        @JsonProperty(value = "power_w", required = true) final double powerW
      ) {
        this.number = parseMeterNumber(number);
        this.purchaseKWh = purchaseWh;
        this.deliverKWh = deliverWh;
        this.powerW = powerW;
      }

      @NonNull
      private static String parseMeterNumber(@NonNull final String input) {
        if (input.isEmpty()) {
          throw new NumberFormatException("Cannot parse Meter number: No Hex-chars read.");
        }
        if (input.length() % 2 != 0) {
          throw new NumberFormatException("Cannot parse Meter number: Hex-char count must be multiple of 2.");
        }
        final int length = Integer.parseInt(input.substring(0, 2), 16);
        if (input.length() != length * 2) {
          throw new NumberFormatException("Cannot parse Meter number: Invalid length");
        }
        final int type = Integer.parseInt(input.substring(2, 4), 16);
        final String name = "" + (char) Integer.parseInt(input.substring(4, 6), 16) + (char) Integer.parseInt(input.substring(6, 8), 16) + (char) Integer.parseInt(input.substring(8, 10), 16);
        final int number = Integer.parseInt(input.substring(10), 16);
        return "%d%s%s".formatted(type, name, number);
      }

    }

  }

}