using System.Collections.Generic;

namespace Encompass {
    public abstract class Engine {
        private EntityManager entityManager;
        private ComponentManager componentManager;

        internal void AssignEntityManager(EntityManager entityManager) {
            this.entityManager = entityManager;
        }

        internal void AssignComponentManager(ComponentManager componentManager) {
            this.componentManager = componentManager;
        }

        public abstract void Update(float dt);

        protected Entity CreateEntity() {
            return this.entityManager.CreateEntity();
        }

        protected IEnumerable<TComponent> ReadComponents<TComponent>() where TComponent : struct, IComponent {
            return this.componentManager.GetActiveComponentsByType<TComponent>();
        }

        protected TComponent ReadComponent<TComponent>() where TComponent : struct, IComponent {
            return this.componentManager.GetActiveComponentByType<TComponent>();
        }
    }
}