// @flow

import {concat} from 'lodash/fp';
import type {Action, AnswerAction, Config} from '../types';

export default function slides(config: Config): (Array<string>, Action) => Array<string> {
  return (array: Array<string> = [], action: Action): Array<string> => {
    switch (action.type) {
      case 'answer': {
        const answerAction = (action: AnswerAction);
        return concat(array, [answerAction.payload.content.ref]);
      }
      default:
        return array;
    }
  };
}