import {Injectable} from '@angular/core';
import {HttpClient, HttpHeaders} from '@angular/common/http';
import {Observable} from 'rxjs/internal/Observable';
import {catchError, tap} from 'rxjs/operators';
import {Subject} from 'rxjs/internal/Subject';
import {ErrorLoggerService} from '../core/error-logger.service';
import {User} from '../user/user';


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

const loginUrl = '/api/login';
const logoutUrl = '/api/logout';
const checkUrl = '/api/Auth';

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  public userObservable = new Subject<User>();

  constructor(private http: HttpClient, private log: ErrorLoggerService) {
    this.check().subscribe();
  }

  private _user: User;

  get user() {
    return this._user;
  }

  set user(user: User) {
    this._user = user;
    this.userObservable.next(user);
  }

  login(name: string, password: string, otp?: string, clientName?: string): Observable<any> {
    const data = {name: name, password: password};
    if (otp) {
      data['otp'] = otp;
    }

    if (clientName) {
      data['clientName'] = clientName;
    }

    return this.http.post(loginUrl, data, httpOptions)
      .pipe(
        tap((user: User) => this.user = user),
        catchError(this.log.handleError('AuthService', 'login'))
      );
  }

  logout(): Observable<any> {
    return this.http.post(logoutUrl, {}, httpOptions)
      .pipe(
        tap((user: User) => this.user = user),
        catchError(this.log.handleError('AuthService', 'logout'))
      );
  }

  check(): Observable<any> {
    return this.http.get(checkUrl, httpOptions)
      .pipe(
        tap((user: User) => this.user = user),
        catchError(this.log.handleError('AuthService', 'check'))
      );
  }

}