WeatherConditionVisibilityCriterion.java

package org.mafagafogigante.dungeon.world;

import org.mafagafogigante.dungeon.entity.creatures.Observer;
import org.mafagafogigante.dungeon.game.World;

import org.jetbrains.annotations.NotNull;

import java.io.Serializable;

/**
 * A VisibilityCriterion based on the current weather condition.
 */
public class WeatherConditionVisibilityCriterion implements Serializable, VisibilityCriterion {

  private final WeatherCondition minimumCondition;
  private final WeatherCondition maximumCondition;

  /**
   * Creates a WeatherConditionVisibilityCriterion that will be met when the condition is heavier than or equal to
   * minimum and lighter than or equal to maximum.
   */
  public WeatherConditionVisibilityCriterion(@NotNull WeatherCondition minimum, @NotNull WeatherCondition maximum) {
    if (minimum.isHeavierThan(maximum)) {
      throw new IllegalArgumentException("minimum cannot be heavier than maximum");
    }
    this.minimumCondition = minimum;
    this.maximumCondition = maximum;
  }

  @Override
  public boolean isMetBy(Observer observer) {
    World world = observer.getObserverLocation().getWorld();
    WeatherCondition currentCondition = world.getWeather().getCurrentCondition(world.getWorldDate());
    boolean meetsMinimum = currentCondition == minimumCondition || currentCondition.isHeavierThan(minimumCondition);
    boolean meetsMaximum = currentCondition == maximumCondition || currentCondition.isLighterThan(maximumCondition);
    return meetsMinimum && meetsMaximum;
  }

}