import { HttpClient, HttpHeaders } from '@angular/common/http';
import { Injectable } from '@angular/core';
import { Observable } from 'rxjs/internal/Observable';
import { catchError } from 'rxjs/operators';

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

const httpOptions = {
  headers: new HttpHeaders({ 'Content-Type': 'application/json' }),
};

const url = '/api/modifiers';
const serviceName = 'ModifierService';

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

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

  list(): Observable<Modifier[]> {
    return <Observable<Modifier[]>>(
      this.http
        .get<Modifier[]>(`${url}/list`)
        .pipe(catchError(this.log.handleError(serviceName, 'getList')))
    );
  }

  save(modifier: Modifier): Observable<Modifier> {
    return <Observable<Modifier>>(
      this.http
        .post<Modifier>(url, modifier, httpOptions)
        .pipe(catchError(this.log.handleError(serviceName, 'save')))
    );
  }

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

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

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