import type { DashboardOverviewViewModelData } from './DashboardOverviewViewModelData';
import { 
  dashboardStatDisplay,
  formatDashboardDate,
  formatRating,
  formatRank,
  formatConsistency,
  formatRaceCount,
  formatFriendCount,
  formatLeaguePosition,
  formatPoints,
  formatTotalDrivers,
} from '@/lib/display-objects/DashboardDisplay';

/**
 * Dashboard Overview ViewModel
 * 
 * Clean class that accepts DTO only and exposes derived values.
 * This is client-only and instantiated after hydration.
 */
export class DashboardOverviewViewModel {
  constructor(private readonly dto: DashboardOverviewViewModelData) {}

  // Current Driver - Derived Values
  get currentDriverName(): string {
    return this.dto.currentDriver?.name || '';
  }

  get currentDriverAvatarUrl(): string {
    return this.dto.currentDriver?.avatarUrl || '';
  }

  get currentDriverCountry(): string {
    return this.dto.currentDriver?.country || '';
  }

  get currentDriverRating(): string {
    return this.dto.currentDriver ? formatRating(this.dto.currentDriver.rating) : '0.0';
  }

  get currentDriverRank(): string {
    return this.dto.currentDriver ? formatRank(this.dto.currentDriver.globalRank) : '0';
  }

  get currentDriverTotalRaces(): string {
    return this.dto.currentDriver ? formatRaceCount(this.dto.currentDriver.totalRaces) : '0';
  }

  get currentDriverWins(): string {
    return this.dto.currentDriver ? formatRaceCount(this.dto.currentDriver.wins) : '0';
  }

  get currentDriverPodiums(): string {
    return this.dto.currentDriver ? formatRaceCount(this.dto.currentDriver.podiums) : '0';
  }

  get currentDriverConsistency(): string {
    return this.dto.currentDriver ? formatConsistency(this.dto.currentDriver.consistency) : '0%';
  }

  // Next Race - Derived Values
  get nextRace(): {
    id: string;
    track: string;
    car: string;
    scheduledAt: string;
    status: string;
    isMyLeague: boolean;
    formattedDate: string;
    formattedTime: string;
    timeUntil: string;
  } | null {
    if (!this.dto.nextRace) return null;

    const dateInfo = formatDashboardDate(new Date(this.dto.nextRace.scheduledAt));

    return {
      id: this.dto.nextRace.id,
      track: this.dto.nextRace.track,
      car: this.dto.nextRace.car,
      scheduledAt: this.dto.nextRace.scheduledAt,
      status: this.dto.nextRace.status,
      isMyLeague: this.dto.nextRace.isMyLeague,
      formattedDate: dateInfo.date,
      formattedTime: dateInfo.time,
      timeUntil: dateInfo.relative,
    };
  }

  // Upcoming Races - Derived Values
  get upcomingRaces(): Array<{
    id: string;
    track: string;
    car: string;
    scheduledAt: string;
    status: string;
    isMyLeague: boolean;
    formattedDate: string;
    formattedTime: string;
    timeUntil: string;
  }> {
    return this.dto.upcomingRaces.map((race) => {
      const dateInfo = formatDashboardDate(new Date(race.scheduledAt));
      return {
        id: race.id,
        track: race.track,
        car: race.car,
        scheduledAt: race.scheduledAt,
        status: race.status,
        isMyLeague: race.isMyLeague,
        formattedDate: dateInfo.date,
        formattedTime: dateInfo.time,
        timeUntil: dateInfo.relative,
      };
    });
  }

  // League Standings - Derived Values
  get leagueStandings(): Array<{
    leagueId: string;
    leagueName: string;
    position: string;
    points: string;
    totalDrivers: string;
  }> {
    return this.dto.leagueStandingsSummaries.map((standing) => ({
      leagueId: standing.leagueId,
      leagueName: standing.leagueName,
      position: formatLeaguePosition(standing.position),
      points: formatPoints(standing.points),
      totalDrivers: formatTotalDrivers(standing.totalDrivers),
    }));
  }

  // Feed Items - Derived Values
  get feedItems(): Array<{
    id: string;
    type: string;
    headline: string;
    body?: string;
    timestamp: string;
    ctaHref?: string;
    ctaLabel?: string;
    formattedTime: string;
  }> {
    return this.dto.feedSummary.items.map((item) => ({
      id: item.id,
      type: item.type,
      headline: item.headline,
      body: item.body,
      timestamp: item.timestamp,
      ctaHref: item.ctaHref,
      ctaLabel: item.ctaLabel,
      formattedTime: formatDashboardDate(new Date(item.timestamp)).relative,
    }));
  }

  // Friends - Derived Values
  get friends(): Array<{
    id: string;
    name: string;
    avatarUrl: string;
    country: string;
  }> {
    // No additional formatting needed for friends
    return this.dto.friends;
  }

  // Active Leagues Count
  get activeLeaguesCount(): string {
    return formatRaceCount(this.dto.activeLeaguesCount);
  }

  // Convenience getters for display
  get hasNextRace(): boolean {
    return this.dto.nextRace !== undefined;
  }

  get hasUpcomingRaces(): boolean {
    return this.dto.upcomingRaces.length > 0;
  }

  get hasLeagueStandings(): boolean {
    return this.dto.leagueStandingsSummaries.length > 0;
  }

  get hasFeedItems(): boolean {
    return this.dto.feedSummary.items.length > 0;
  }

  get hasFriends(): boolean {
    return this.dto.friends.length > 0;
  }

  get friendCount(): string {
    return formatFriendCount(this.dto.friends.length);
  }
}