import { Injectable } from '@angular/core';
import { Effect, Actions, ofType } from '@ngrx/effects';
import { of } from 'rxjs';
import { catchError, exhaustMap, map, tap } from 'rxjs/operators';

import { MetaCrawler, MetaCrawlerInputItem } from '@overflow/commons-typescript/model/meta';

import { MetaCrawlerInputItemService } from '../../../service/meta-crawler-input-item.service';

import {
  ReadAllByMetaCrawler,
  ReadAllByMetaCrawlerSuccess,
  ReadAllByMetaCrawlerFailure,
  ActionType,
} from './meta-crawler-input-item.action';

@Injectable()
export class Effects {

  constructor(
    private actions$: Actions,
    private metaCrawlerInputItemService: MetaCrawlerInputItemService,
  ) { }

  @Effect()
  readAllByMetaCrawler$ = this.actions$.pipe(
    ofType(ActionType.ReadAllByMetaCrawler),
    map((action: ReadAllByMetaCrawler) => action.payload),
    exhaustMap((metaCrawler: MetaCrawler) =>
      this.metaCrawlerInputItemService
        .readAllByMetaCrawler(metaCrawler)
        .pipe(
          map((result: MetaCrawlerInputItem[]) => {
            return new ReadAllByMetaCrawlerSuccess(result);
          }),
          catchError(error => of(new ReadAllByMetaCrawlerFailure(error)))
        )
    )
  );
}