import {fromJSON as behaviorItemFromJSON} from './registry';

export function Collection(type) {

  return class Collection {

    static type() {
      return `${type}s`;
    }

    constructor() {
      this[`${type}s`] = [];
    }

    count() {
      return this[`${type}s`].length;
    }

    fromJSON(json) {
      this[`${type}s`] = [];
      for (const i in json.items) {
        const item = json.items[i];
        this[`${type}s`].push(behaviorItemFromJSON(item.type, item));
      }
      return this;
    }

    toJSON() {
      return {
        type,
        items: this[`${type}s`].map((item) => item.toJSON()),
      };
    }
  };
}