import { HttpClient, HttpParams } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable, of as observableOf } from 'rxjs';
import { catchError } from 'rxjs/operators';

import { ErrorLoggerService } from '../core/error-logger.service';

import { Recipe } from './recipe';

const url = '/api/recipes';
const serviceName = 'RecipeService';

@Injectable({ providedIn: 'root' })
export class RecipeService {
  constructor(
    private http: HttpClient,
    private log: ErrorLoggerService,
  ) {}

  get(id: string | null): Observable<Recipe> {
    const getUrl: string = id === null ? `${url}` : `${url}/${id}`;
    return this.http
      .get<Recipe>(getUrl)
      .pipe(catchError(this.log.handleError(serviceName, `get id=${id}`))) as Observable<Recipe>;
  }

  list(periodId: string | null): Observable<Recipe[]> {
    if (periodId === null) {
      return observableOf([]);
    }
    return this.http
      .get<Recipe[]>(`${url}/list`, { params: new HttpParams().set('p', periodId) })
      .pipe(catchError(this.log.handleError(serviceName, 'getList'))) as Observable<Recipe[]>;
  }

  save(recipe: Recipe): Observable<Recipe> {
    return this.http
      .post<Recipe>(`${url}`, recipe)
      .pipe(catchError(this.log.handleError(serviceName, 'save'))) as Observable<Recipe>;
  }

  update(recipe: Recipe): Observable<Recipe> {
    return this.http
      .put<Recipe>(`${url}/${recipe.id}`, recipe)
      .pipe(catchError(this.log.handleError(serviceName, 'update'))) as Observable<Recipe>;
  }

  saveOrUpdate(recipe: Recipe): Observable<Recipe> {
    if (!recipe.id) {
      return this.save(recipe);
    }
    return this.update(recipe);
  }

  delete(id: string): Observable<Recipe> {
    return this.http
      .delete<Recipe>(`${url}/${id}`)
      .pipe(catchError(this.log.handleError(serviceName, 'delete'))) as Observable<Recipe>;
  }
}