/**
 * Race Detail View Data Builder
 * 
 * Transforms API DTO to ViewData for templates.
 */

import type { RaceDetailDTO } from '@/lib/types/generated/RaceDetailDTO';
import type { 
  RaceDetailEntry, 
  RaceDetailLeague, 
  RaceDetailRace, 
  RaceDetailRegistration, 
  RaceDetailUserResult, 
  RaceDetailViewData 
} from '@/lib/view-data/RaceDetailViewData';

import { ViewDataBuilder } from "../../contracts/builders/ViewDataBuilder";

export class RaceDetailViewDataBuilder {
  /**
   * Transform API DTO to ViewData
   * 
   * @param apiDto - The DTO from the service
   * @returns ViewData for the race detail page
   */
  public static build(apiDto: RaceDetailDTO): RaceDetailViewData {
    if (!apiDto || !apiDto.race) {
      return {
        race: {
          id: '',
          track: '',
          car: '',
          scheduledAt: '',
          status: 'scheduled',
          sessionType: 'race',
        },
        entryList: [],
        registration: {
          isUserRegistered: false,
          canRegister: false,
        },
        canReopenRace: false,
      };
    }

    const race: RaceDetailRace = {
      id: apiDto.race.id,
      track: apiDto.race.track || '',
      car: apiDto.race.car || '',
      scheduledAt: apiDto.race.scheduledAt,
      status: apiDto.race.status as 'scheduled' | 'running' | 'completed' | 'cancelled',
      sessionType: apiDto.race.sessionType || 'race',
    };

    const league: RaceDetailLeague | undefined = apiDto.league ? {
      id: apiDto.league.id,
      name: apiDto.league.name,
      description: apiDto.league.description || undefined,
      settings: {
        maxDrivers: apiDto.league.maxDrivers ?? 32,
        qualifyingFormat: apiDto.league.qualifyingFormat ?? 'Open',
      },
    } : undefined;

    const entryList: RaceDetailEntry[] = (apiDto.entryList || []).map((entry) => ({
      id: entry.id,
      name: entry.name,
      avatarUrl: entry.avatarUrl || '',
      country: entry.country,
      rating: entry.rating,
      isCurrentUser: entry.isCurrentUser,
    }));

    const registration: RaceDetailRegistration = {
      isUserRegistered: apiDto.registration.isUserRegistered,
      canRegister: apiDto.registration.canRegister,
    };

    const userResult: RaceDetailUserResult | undefined = apiDto.userResult ? {
      position: apiDto.userResult.position,
      startPosition: apiDto.userResult.startPosition,
      positionChange: apiDto.userResult.positionChange,
      incidents: apiDto.userResult.incidents,
      isClean: apiDto.userResult.isClean,
      isPodium: apiDto.userResult.isPodium,
      ratingChange: apiDto.userResult.ratingChange,
    } : undefined;

    return {
      race,
      league,
      entryList,
      registration,
      userResult,
      canReopenRace: (apiDto as any).canReopenRace || false,
    };
  }
}

RaceDetailViewDataBuilder satisfies ViewDataBuilder<RaceDetailDTO, RaceDetailViewData>;