import type {
  IRacesPagePresenter,
  RacesPageViewModel,
  RaceListItemViewModel,
} from '@gridpilot/racing/application/presenters/IRacesPagePresenter';

export class RacesPagePresenter implements IRacesPagePresenter {
  private viewModel: RacesPageViewModel | null = null;

  present(races: any[]): void {
    const now = new Date();
    const nextWeek = new Date(now.getTime() + 7 * 24 * 60 * 60 * 1000);

    const raceViewModels: RaceListItemViewModel[] = races.map(race => ({
      id: race.id,
      track: race.track,
      car: race.car,
      scheduledAt: race.scheduledAt,
      status: race.status,
      leagueId: race.leagueId,
      leagueName: race.leagueName,
      strengthOfField: race.strengthOfField,
      isUpcoming: race.isUpcoming,
      isLive: race.isLive,
      isPast: race.isPast,
    }));

    const stats = {
      total: raceViewModels.length,
      scheduled: raceViewModels.filter(r => r.status === 'scheduled').length,
      running: raceViewModels.filter(r => r.status === 'running').length,
      completed: raceViewModels.filter(r => r.status === 'completed').length,
    };

    const liveRaces = raceViewModels.filter(r => r.isLive);

    const upcomingThisWeek = raceViewModels
      .filter(r => {
        const scheduledDate = new Date(r.scheduledAt);
        return r.isUpcoming && scheduledDate >= now && scheduledDate <= nextWeek;
      })
      .slice(0, 5);

    const recentResults = raceViewModels
      .filter(r => r.status === 'completed')
      .sort((a, b) => new Date(b.scheduledAt).getTime() - new Date(a.scheduledAt).getTime())
      .slice(0, 3);

    this.viewModel = {
      races: raceViewModels,
      stats,
      liveRaces,
      upcomingThisWeek,
      recentResults,
    };
  }

  getViewModel(): RacesPageViewModel {
    if (!this.viewModel) {
      throw new Error('ViewModel not yet generated. Call present() first.');
    }
    return this.viewModel;
  }
}