import { Vector3, type Object3D } from "three";

const anchors = new Map<string, Object3D>();

export function registerCombatEffectAnchor(actorId: string, object: Object3D): () => void {
  anchors.set(actorId, object);
  return () => {
    if (anchors.get(actorId) === object) anchors.delete(actorId);
  };
}

/**
 * Copies an actor's current rendered world position into an effect's parent
 * space. This follows the scene object directly instead of a throttled combat
 * or network snapshot while deliberately avoiding inherited actor rotation.
 */
export function updateCombatEffectAnchorPosition(
  actorId: string | undefined,
  effect: Object3D,
  worldPosition: Vector3,
): boolean {
  if (!actorId) return false;
  const anchor = anchors.get(actorId);
  if (!anchor) return false;
  anchor.getWorldPosition(worldPosition);
  effect.parent?.worldToLocal(worldPosition);
  effect.position.copy(worldPosition);
  return true;
}

export function clearCombatEffectAnchorRegistry(): void {
  anchors.clear();
}