package de.ph87.data.value;

import com.fasterxml.jackson.core.*;
import com.fasterxml.jackson.databind.*;
import lombok.*;

import java.io.*;
import java.util.*;

public enum Unit {
  TEMPERATURE_C("°C"),

  PRESSURE_PA("Pa"),
  PRESSURE_HPA("hPa", 100, PRESSURE_PA),

  HUMIDITY_RELATIVE_PERCENT("%"),

  HUMIDITY_ABSOLUTE_GM3("g/m³"),
  HUMIDITY_ABSOLUTE_MGL("mg/L", 1, HUMIDITY_ABSOLUTE_GM3),

  ILLUMINANCE_LUX("lux"),

  RESISTANCE_OHMS("Ω"),

  ALTITUDE_M("m"),
  ALTITUDE_KM("km", 1000, ALTITUDE_M),

  POWER_W("W"),
  POWER_KW("kW", 1000, POWER_W),

  ENERGY_WH("Wh"),
  ENERGY_KWH("kWh", 1000, ENERGY_WH),

  IAQ("IAQ"),
  IAQ_CO2_EQUIVALENT("ppm"),
  IAQ_VOC_EQUIVALENT("ppm"),

  SUN_DC("Δ°C"),

  UNIT_PERCENT("%"),

  CLOUD_COVER_PERCENT("%"),

  IRRADIATION_WH_M2("Wh/m²"),
  IRRADIATION_KWH_M2("kWh/m²", 1000, IRRADIATION_WH_M2),

  PRECIPITATION_MM("mm"),
  ;

  public final String unit;

  public final double factor;

  public final Unit base;

  Unit(@NonNull final String unit) {
    this.unit = unit;
    this.factor = 1.0;
    this.base = this;
  }

  Unit(@NonNull final String unit, final double factor, @NonNull final Unit base) {
    this.unit = unit;
    this.factor = factor;
    this.base = base;
  }

  public static class NotConvertible extends RuntimeException {

    public NotConvertible(@NonNull final Unit source, final Unit target) {
      super("Cannot convert Units: source=%s, target=%s".formatted(source, target));
    }

  }

  public static class ListDeserializer extends JsonDeserializer<List<Unit>> {

    @Override
    public List<Unit> deserialize(final JsonParser jsonParser, final DeserializationContext deserializationContext) throws IOException {
      final String name = jsonParser.getValueAsString();
      return Arrays.stream(values()).filter(unit -> unit.unit.equals(name)).toList();
    }

  }
}