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import { Injectable } from "@angular/core";
import { Actions, Effect } from "@ngrx/effects";
import { Observable } from "rxjs";
import { GET_TODOS, GET_TODOS_SUCCESS, GET_TODOS_ERROR } from "./app.module";
import { TodosService } from "./todos.service";

@Injectable()
export class TodosEffects {
  constructor( private actions$ : Actions, 
               private todosService : TodosService ) {
  }

  @Effect() getTodos$ = this.actions$
    .ofType(GET_TODOS)
    .switchMap(action =>
      this.todosService.getTodos()
           .map(todos => ({type: GET_TODOS_SUCCESS, payload: todos}))
           .catch(() => Observable.of({type: GET_TODOS_ERROR})));
}