import { Injectable, inject } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable, BehaviorSubject } from 'rxjs';
import { tap, shareReplay } from 'rxjs/operators';
import { LoginRequest, LoginResponse, RegisterRequest } from '../models/mail.models';

@Injectable({
  providedIn: 'root'
})
export class AuthService {
  private http = inject(HttpClient);
  private apiUrl = '/api';

  private currentUserSubject = new BehaviorSubject<string | null>(
    localStorage.getItem('email')
  );
  currentUser$ = this.currentUserSubject.asObservable();

  private tokenSubject = new BehaviorSubject<string | null>(
    localStorage.getItem('token')
  );
  token$ = this.tokenSubject.asObservable();

  login({ email, password }: LoginRequest): Observable<LoginResponse> {
    return this.http.post<LoginResponse>(`${this.apiUrl}/login`, { email, password }).pipe(
      tap(({ token, email }) => {
        localStorage.setItem('token', token);
        localStorage.setItem('email', email);
        this.tokenSubject.next(token);
        this.currentUserSubject.next(email);
      })
    );
  }

  register({ email, password, displayName }: RegisterRequest): Observable<void> {
    return this.http.post<void>(`${this.apiUrl}/register`, { email, password, displayName });
  }

  logout(): void {
    localStorage.removeItem('token');
    localStorage.removeItem('email');
    this.tokenSubject.next(null);
    this.currentUserSubject.next(null);
  }

  getToken(): string | null {
    return localStorage.getItem('token');
  }

  isLoggedIn(): boolean {
    return !!localStorage.getItem('token');
  }

  getEmail(): string | null {
    return localStorage.getItem('email');
  }
}