package coffee.liz.ecs.model;

import java.time.Duration;
import java.util.Collection;

/**
 * Updates the {@link World} state.
 *
 * @param <T>
 *            is the state of the stuff outside the {@link World}.
 */
public interface System<T> extends AutoCloseable {
	/**
	 * {@link System} clazzes that must run before this system.
	 *
	 * @return {@link Collection} of dependencies.
	 */
	Collection<Class<? extends System<T>>> getDependencies();

	/**
	 * @param world
	 *            Is the {@link World}.
	 * @param state
	 *            Is the {@link T} state outside the {@param world}.
	 * @param dt
	 *            Is the timestep.
	 */
	void update(final World<T> world, final T state, final Duration dt);

	@Override
	default void close() {
	}
}