import {TickingPromise} from '@avocado/core';

import {Collection} from './collection';
import {Traversal} from './traversal';

export class Traversals extends Collection('traversal') {

  parallel(context) {
    const results = this.traversals.map((traversal) => {
      return traversal.traverse(context);
    });
    // Early out if no promises.
    if (!results.reduce((has, result) => {
      return has || result instanceof Promise;
    }, false)) {
      return results;
    }
    return TickingPromise.all(results);
  }

}