import { Injectable, signal } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';
import { tap } from 'rxjs/operators';
import type { AuthUser } from './auth.service';

export interface UserPreferences {
  language?: string | null;
  defaultProvider?: string | null;
  defaultProviders?: string[] | null;
  theme?: 'light' | 'dark' | 'black' | 'system' | string | null;
  videoQuality?: string | null;
  region?: string | null;
  version?: number | null;
}

@Injectable({ providedIn: 'root' })
export class UserService {
  private _preferences = signal<UserPreferences | null>(null);

  constructor(private http: HttpClient) {}

  preferences() {
    return this._preferences();
  }

  /** Même règle que les autres services : /proxy/api en dev (proxy Angular),
   * /api quand on est servi par le backend :4000 (prod/docker). L'URL codée
   * en dur cassait loadMe/loadPreferences en prod (-> currentUser null). */
  private apiBase(): string {
    try {
      const port = window?.location?.port || '';
      return port && port !== '4000' ? '/proxy/api' : '/api';
    } catch {
      return '/api';
    }
  }

  loadPreferences(): Observable<UserPreferences> {
    return this.http.get<UserPreferences>(`${this.apiBase()}/user/preferences`, { withCredentials: true }).pipe(
      tap(p => this._preferences.set(p || {}))
    );
  }

  updatePreferences(patch: Partial<UserPreferences>): Observable<UserPreferences> {
    return this.http.patch<UserPreferences>(`${this.apiBase()}/user/preferences`, patch, { withCredentials: true }).pipe(
      tap(p => this._preferences.set(p || {}))
    );
  }

  loadMe(): Observable<AuthUser> {
    return this.http.get<AuthUser>(`${this.apiBase()}/user/me`, { withCredentials: true });
  }
}