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package coffee.liz.ecs
import kotlin.jvm.JvmName
import kotlin.reflect.KClass
/**
* The World manages entities and systems.
*/
interface World {
/**
* Create a new entity with a unique ID.
*/
fun createEntity(): Entity
/**
* Destroy an entity and remove it from all caches.
*/
fun destroyEntity(entity: Entity)
/**
* Get all entities that have all the specified component types.
*/
fun query(vararg componentTypes: KClass<out Component>): Set<Entity>
/**
* Update all systems in dependency order.
* @param deltaTime Time elapsed since last update in seconds
*/
fun update(deltaTime: Float)
}
// Convenience extension for queries
@JvmName("query1")
inline fun <reified T : Component> World.query(): Set<Entity> = query(T::class)
@JvmName("query2")
inline fun <reified T1 : Component, reified T2 : Component> World.query(): Set<Entity> =
query(T1::class, T2::class)
@JvmName("query3")
inline fun <reified T1 : Component, reified T2 : Component, reified T3 : Component> World.query(): Set<Entity> =
query(T1::class, T2::class, T3::class)
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