import { Injectable, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable, firstValueFrom, tap } from 'rxjs';
import { API_URL } from '../tokens/index';

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  private url: string;

  constructor(private http: HttpClient) {
    const api_url = inject(API_URL);
    this.url = `${api_url}/auth`;
  }

  login(credentials: { username: string; password: string }): Observable<any> {
    return this.http.post(`${this.url}/login`, credentials).pipe(
      tap({
        next: res => this.#IsAuthenticated = true,
        error: () => this.#IsAuthenticated = false
      })
    )
  }

  logout(): Observable<any> {
    return this.http.post(`${this.url}/logout`, {}).pipe(
      tap({
        next: res => this.#IsAuthenticated = false,
        error: () => this.#IsAuthenticated = true
      })
    );
  }

  async logoutAsync(): Promise<void> {
    return await firstValueFrom(this.logout());
  }

  isAuthenticated(): Observable<boolean> {
    return this.http.get<boolean>(`${this.url}/check`).pipe(
      tap(isAuthenticated => this.#IsAuthenticated = isAuthenticated)
    );
  }

  #IsAuthenticated = false;
  get IsAuthenticated(): boolean {
    return this.#IsAuthenticated;
  }
}