import { HomeData } from '../model/HomeModels';
import { HomeRepository } from '../data/repository/HomeRepository';
import { SessionRepository } from '../data/repository/SessionRepository';
import { ServiceLocator } from '../di/ServiceLocator';

/**
 * 首页视图模型：@ObservedV2 三态（loading / error / data）。
 * 根据登录态分流到游客首页 / 原生首页。
 */
@ObservedV2
export class HomeViewModel {
  @Trace data: HomeData = new HomeData();
  @Trace isGuest: boolean = true;
  @Trace loading: boolean = false;
  @Trace error: string = '';

  private readonly repository: HomeRepository;
  private readonly session: SessionRepository;

  constructor(repository: HomeRepository, session: SessionRepository) {
    this.repository = repository;
    this.session = session;
  }

  static create(): HomeViewModel {
    return new HomeViewModel(
      ServiceLocator.get('homeRepository') as HomeRepository,
      ServiceLocator.get('sessionRepository') as SessionRepository
    );
  }

  async load(): Promise<void> {
    this.loading = true;
    this.error = '';
    try {
      const loggedIn = this.session.isLoggedIn();
      this.isGuest = !loggedIn;
      this.data = loggedIn ? await this.repository.observeHome() : await this.repository.observeGuestHome();
    } catch (err) {
      this.error = JSON.stringify(err);
    } finally {
      this.loading = false;
    }
  }
}