import { catchError, map, switchMap } from 'rxjs/operators';
import { combineEpics, ofType } from 'redux-observable';
import { FAQ, getAllFailure, getAllRequest, getAllSuccess } from './faq.actions';
import { ENTERED_FAQ_PAGE } from 'app/common/store/router/router.constants';
import { PretypedEpic } from 'app/common/store/store.types';

export const enteredFaqPageEpic: PretypedEpic<undefined> = (action$) => {
  return action$.pipe(
    ofType(ENTERED_FAQ_PAGE),
    map(() => [ getAllRequest() ])
  );
};

export const getAllEpic: PretypedEpic<undefined> = (action$, _, { faqService }) => {
  return action$.pipe(
    ofType(FAQ.GET_ALL_REQUEST),
    switchMap(() => {
      return faqService.getFaq().pipe(
        map((faq) => [
          getAllSuccess(faq),
        ]),
        catchError(() => [
          getAllFailure(),
        ]),
      );
    }),
  );
};

const faqEpic = combineEpics(enteredFaqPageEpic, getAllEpic);

export { faqEpic };