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

export default class CalculateAabbs extends System {

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

  tick() {
    for (const entity of this.ecs.changed(['Position'])) {
      const {Position: {x, y}, Sprite, VisibleAabb} = entity;
      if (VisibleAabb) {
        let size = undefined;
        if (Sprite) {
          const frame = Sprite.animation
            ? Sprite.$$sourceJson.animations[Sprite.animation][Sprite.frame]
            : '';
          size = Sprite.$$sourceJson.frames[frame].sourceSize;
        }
        /* v8 ignore next 3 */
        if (!size) {
          throw new Error(`no size for aabb for entity ${entity.id}(${JSON.stringify(entity.toJSON(), null, 2)})`);
        }
        VisibleAabb.x0 = x - ((size.w ) * (Sprite.anchor.x));
        VisibleAabb.x1 = x + ((size.w ) * (1 - Sprite.anchor.x));
        VisibleAabb.y0 = y - ((size.h ) * (Sprite.anchor.y));
        VisibleAabb.y1 = y + ((size.h ) * (1 - Sprite.anchor.y));
      }
    }
  }

}