import { Subscribable } from "./Subscribable.js";

class SubscribeSet extends Subscribable {
  constructor() {
    super();
    Object.assign(this.events, {
      addItem: [],
      deleteItem: [],
      changeItem: [],
      askAdd: [],
    });
    Object.assign(this.eventDeps, {
      addItem: ["changeItem"],
      deleteItem: ["changeItem"],
      changeItem: [],
      askAdd: [],
    });
    this.set = new Set();
  }

  has(key) {
    return this.set.has(key);
  }

  forEach(f) {
    for (const key of this.set.keys()) {
      f(key);
    }
  }

  askAdd(key) {
    this.broadcast("askAdd", key);
  }

  add(key) {
    if (!this.set.has(key)) {
      this.set.add(key);
      this.broadcast("addItem", key);
    }
  }

  delete(key) {
    if (this.set.has(key)) {
      this.set.delete(key);
      this.broadcast("deleteItem", key);
    }
  }
}

export { SubscribeSet };