package coffee.liz.ecs

import kotlin.reflect.KClass
import kotlin.time.Duration

/**
 * [World] is the state of the world.
 * @param Outside is the state of the stuff outside the world (input, etc.).
 */
interface World<Outside> {
    /**
     * Create unique [Entity] in the [World].
     */
    fun createEntity(): Entity

    /**
     * Remove [entity] from [World].
     */
    fun removeEntity(entity: Entity)

    /**
     * Get entities with a [Component] type.
     */
    fun query(vararg componentTypes: KClass<out Component>): Set<Entity>

    /**
     * Integrate the [World].
     */
    fun update(
        state: Outside,
        deltaTime: Duration,
    )
}