package coffee.liz.ecs

import kotlin.reflect.KClass

/**
 * Systems contain the logic that operates on entities with specific components.
 */
interface System {
    /**
     * Systems that must run before this system in the update loop.
     * Used to construct a dependency DAG.
     */
    val dependencies: Set<KClass<out System>>
        get() = emptySet()

    /**
     * Update this system. Called once per frame.
     * @param world The world containing entities and systems
     * @param deltaTime Time elapsed since last update in seconds
     */
    fun update(world: World, deltaTime: Float)
}