import type { DashboardPageDto } from '@/lib/page-queries/DashboardPageDto';
import type { DashboardViewData } from '@/templates/DashboardViewData';
import { 
  formatDashboardDate,
  formatRating,
  formatRank,
  formatConsistency,
  formatRaceCount,
  formatFriendCount,
  formatLeaguePosition,
  formatPoints,
  formatTotalDrivers,
} from '@/lib/display-objects/DashboardDisplay';

/**
 * DashboardPresenter - Client-side presenter for dashboard page
 * Transforms Page DTO into ViewData for the template
 * Deterministic; no hooks; no side effects
 */
export class DashboardPresenter {
  static createViewData(pageDto: DashboardPageDto): DashboardViewData {
    return {
      currentDriver: {
        name: pageDto.currentDriver?.name || '',
        avatarUrl: pageDto.currentDriver?.avatarUrl || '',
        country: pageDto.currentDriver?.country || '',
        rating: pageDto.currentDriver ? formatRating(pageDto.currentDriver.rating) : '0.0',
        rank: pageDto.currentDriver ? formatRank(pageDto.currentDriver.globalRank) : '0',
        totalRaces: pageDto.currentDriver ? formatRaceCount(pageDto.currentDriver.totalRaces) : '0',
        wins: pageDto.currentDriver ? formatRaceCount(pageDto.currentDriver.wins) : '0',
        podiums: pageDto.currentDriver ? formatRaceCount(pageDto.currentDriver.podiums) : '0',
        consistency: pageDto.currentDriver ? formatConsistency(pageDto.currentDriver.consistency) : '0%',
      },
      nextRace: pageDto.nextRace ? (() => {
        const dateInfo = formatDashboardDate(new Date(pageDto.nextRace.scheduledAt));
        return {
          id: pageDto.nextRace.id,
          track: pageDto.nextRace.track,
          car: pageDto.nextRace.car,
          scheduledAt: pageDto.nextRace.scheduledAt,
          formattedDate: dateInfo.date,
          formattedTime: dateInfo.time,
          timeUntil: dateInfo.relative,
          isMyLeague: pageDto.nextRace.isMyLeague,
        };
      })() : null,
      upcomingRaces: pageDto.upcomingRaces.map((race) => {
        const dateInfo = formatDashboardDate(new Date(race.scheduledAt));
        return {
          id: race.id,
          track: race.track,
          car: race.car,
          scheduledAt: race.scheduledAt,
          formattedDate: dateInfo.date,
          formattedTime: dateInfo.time,
          timeUntil: dateInfo.relative,
          isMyLeague: race.isMyLeague,
        };
      }),
      leagueStandings: pageDto.leagueStandingsSummaries.map((standing) => ({
        leagueId: standing.leagueId,
        leagueName: standing.leagueName,
        position: formatLeaguePosition(standing.position),
        points: formatPoints(standing.points),
        totalDrivers: formatTotalDrivers(standing.totalDrivers),
      })),
      feedItems: pageDto.feedSummary.items.map((item) => ({
        id: item.id,
        type: item.type,
        headline: item.headline,
        body: item.body,
        timestamp: item.timestamp,
        formattedTime: formatDashboardDate(new Date(item.timestamp)).relative,
        ctaHref: item.ctaHref,
        ctaLabel: item.ctaLabel,
      })),
      friends: pageDto.friends.map((friend) => ({
        id: friend.id,
        name: friend.name,
        avatarUrl: friend.avatarUrl,
        country: friend.country,
      })),
      activeLeaguesCount: formatRaceCount(pageDto.activeLeaguesCount),
      friendCount: formatFriendCount(pageDto.friends.length),
      hasUpcomingRaces: pageDto.upcomingRaces.length > 0,
      hasLeagueStandings: pageDto.leagueStandingsSummaries.length > 0,
      hasFeedItems: pageDto.feedSummary.items.length > 0,
      hasFriends: pageDto.friends.length > 0,
    };
  }
}