import Component from '@/ecs/component.js';
import Script from '@/util/script.js';

export default class Wielder extends Component {
  instanceFromSchema() {
    const {ecs} = this;
    const Instance = super.instanceFromSchema();
    return class WielderInstance extends Instance {
      activeItem() {
        const {Inventory, Wielder} = ecs.get(this.entity);
        return Inventory.item(Wielder.activeSlot + 1);
      }
      useActiveItem(state) {
        const entity = ecs.get(this.entity);
        const {Ticking} = entity;
        const activeItem = this.activeItem();
        if (activeItem) {
          ecs.readAsset([activeItem.source, state ? 'start.js' : 'stop.js'].join('/'))
            .then((code) => {
              if (code.byteLength > 0) {
                const context = {
                  ecs,
                  item: activeItem,
                  wielder: entity,
                };
                Ticking.addTickingPromise(Script.tickingPromise((new TextDecoder()).decode(code), context));
              }
            });
        }


      }
    }
  }
  static properties = {
    activeSlot: {type: 'uint16'},
  };
}