// @flow

import {concat, includes} from 'lodash/fp';

import type {Action, AskClueAction, Config} from '../types';

export default function requestedClues(config: Config): (Array<string>, Action) => Array<string> {
  return (array: Array<string> = [], action: Action): Array<string> => {
    switch (action.type) {
      case 'clue': {
        const requestedClueAction = (action: AskClueAction);
        const slideRef = requestedClueAction.payload.content.ref;
        return includes(slideRef, array) ? array : concat(array, [slideRef]);
      }
      default:
        return array;
    }
  };
}