package de.ph87.home.common;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

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

public class EpochSecondsToZonedDateTime extends JsonDeserializer<ZonedDateTime> {

  @Override
  public ZonedDateTime deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException {
    final long epochSeconds = jsonParser.getLongValue();
    if (epochSeconds < 0) {
      throw new RuntimeException();
    }
    if (epochSeconds == 0) {
      return null;
    }
    return ZonedDateTime.ofInstant(Instant.ofEpochSecond(epochSeconds), ZoneId.systemDefault());
  }

}