import {System} from '@/ecs/index.js';

export default class Colliders extends System {

  static get priority() {
    return {
      after: 'MaintainColliderHash',
    };
  }

  tick() {
    const checked = new Map();
    for (const entity of this.ecs.changed(['Position'])) {
      if (!entity.Collider) {
        continue;
      }
      if (!checked.has(entity)) {
        checked.set(entity, new Set());
      }
      const within = this.ecs.system('MaintainColliderHash').within(entity.Collider.aabb);
      for (const other of within) {
        if (entity === other || !other.Collider) {
          continue;
        }
        if (!checked.has(other)) {
          checked.set(other, new Set());
        }
        if (checked.get(entity).has(other)) {
          continue;
        }
        checked.get(other).add(entity);
        entity.Collider.checkCollision(other.Collider);
      }
      for (const [other, intersections] of entity.Collider.$$intersections) {
        if (!within.has(this.ecs.get(other.entity))) {
          entity.Collider.endIntersections(other, intersections);
        }
      }
    }
  }

}