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package io.github.oliviercailloux.teachingexamples;

import java.util.Objects;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class Heater implements CostlyThingWithUnit {
  @SuppressWarnings("unused")
  private static final Logger LOGGER = LoggerFactory.getLogger(Heater.class);

  private int power;
  private double price;
  private String identifier;

  public static Heater standard(int power, String identifier) {
    return new Heater(power, power / 10d, identifier);
  }

  public static Heater LG() {
    return new Heater(2000, 180d, "LG");
  }

  @Override
  public boolean equals(Object o2) {
    if (o2 instanceof Heater) {
      Heater h2 = (Heater) o2;
      boolean equalPower = this.power == h2.power;
      boolean equalPrice = this.price == h2.price;
      boolean equalIds = this.identifier == h2.identifier;
      return equalPower && equalPrice && equalIds;
    }
    return false;
  }

  @Override
  public int hashCode() {
    return Objects.hash(power, price, identifier);
  }

  private Heater(int power, double price, String identifier) {
    LOGGER.info("Creating heater {}: {}, {}.", identifier, power, price);
    this.power = power;
    this.price = price;
    this.identifier = identifier;
    // price = power / 10d;
  }

  public String getIdentifier() {
    return identifier;
  }

  public int power() {
    return power;
  }

  @Override
  public double pricePerHour() {
    double kW = kW();
    return kW * 0.10d;
  }

  private double kW() {
    return power / 1000d;
  }

  @Override
  public double price() {
    return price;
  }

  @Override
  public String unit() {
    return "Euros";
  }

  @Override
  public String toString() {
    return "Heater with power " + power;
  }
}