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

class SubscribeMapList extends Subscribable {
  constructor(inner) {
    super();
    this.inner = inner;
    Object.assign(this.events, {
      addItem: [],
      deleteItem: [],
      editItem: [],
      changeItem: [],
      askAdd: [],
    });
    Object.assign(this.eventDeps, {
      addItem: ["changeItem"],
      deleteItem: ["changeItem"],
      editItem: ["changeItem"],
      changeItem: [],
      askAdd: [],
    });
    this.map = new Map();
    this.list = [];
  }

  has(key) {
    return this.map.has(key) && this.map.get(key).exists();
  }

  get(key) {
    if (this.map.has(key)) {
      return this.map.get(key);
    } else {
      const item = new this.inner();
      this.map.set(key, item);
      return item;
    }
  }

  forEach(f) {
    this.list.forEach((key) => f(key, this.get(key)));
  }

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

  addStart(key, value) {
    this._add(key, value, true);
  }

  addEnd(key, value) {
    this._add(key, value, false);
  }

  sort() {
    this.list.sort((a, b) => {
      const orderA = this.map.get(a).value().order;
      const orderB = this.map.get(b).value().order;
      return orderA - orderB;
    });
    this.broadcast("changeItem");
  }

  _add(key, value, start) {
    let s;
    if (this.map.has(key)) {
      const exists = this.map.get(key).exists();
      s = this.map.get(key).set(value);
      if (exists) {
        this.broadcast("editItem", key);
      } else {
        this.broadcast("addItem", key);
      }
    } else {
      s = new this.inner().set(value);
      this.map.set(key, s);
      if (start) this.list.unshift(key);
      else this.list.push(key);
      this.broadcast("addItem", key);
    }
    return s;
  }
}

export { SubscribeMapList };