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package coffee.liz.ecs
import kotlin.reflect.KClass
/**
* An entity is a unique identifier with a collection of components.
*/
class Entity(
val id: Int,
) {
private val components = mutableMapOf<KClass<out Component>, Component>()
/**
* Add [Component].
*/
fun <T : Component> add(component: T): Entity {
components[component::class] = component
return this
}
/**
* Remove [Component].
*/
fun <T : Component> remove(type: KClass<T>): Entity {
components.remove(type)
return this
}
/**
* Get [Component]
*/
@Suppress("UNCHECKED_CAST")
fun <T : Component> get(type: KClass<T>): T = components[type] as T
/**
* Has [Component]
*/
fun <T : Component> has(type: KClass<T>): Boolean = components.containsKey(type)
/**
* [Component]s of this entity.
*/
fun componentTypes(): Set<KClass<out Component>> = components.keys.toSet()
override fun equals(other: Any?): Boolean {
if (this === other) return true
if (other !is Entity) return false
return id == other.id
}
override fun hashCode(): Int = id
override fun toString(): String = "Entity($id)"
}
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