import type { IStandingRepository } from '../../domain/repositories/IStandingRepository';
import type { IDriverRepository } from '../../domain/repositories/IDriverRepository';
import type {
  ILeagueStandingsPresenter,
  LeagueStandingsResultDTO,
  LeagueStandingsViewModel,
} from '../presenters/ILeagueStandingsPresenter';
import type { UseCase } from '@core/shared/application/UseCase';

export interface GetLeagueStandingsUseCaseParams {
  leagueId: string;
}

/**
 * Use Case for retrieving league standings.
 * Orchestrates domain logic and delegates presentation to the presenter.
 */
export class GetLeagueStandingsUseCase
  implements
    UseCase<GetLeagueStandingsUseCaseParams, LeagueStandingsResultDTO, LeagueStandingsViewModel, ILeagueStandingsPresenter>
{
  constructor(
    private readonly standingRepository: IStandingRepository,
    private readonly driverRepository: IDriverRepository,
  ) {}

  async execute(
    params: GetLeagueStandingsUseCaseParams,
    presenter: ILeagueStandingsPresenter,
  ): Promise<void> {
    const standings = await this.standingRepository.findByLeagueId(params.leagueId);
    const driverIds = [...new Set(standings.map(s => s.driverId))];
    const drivers = await this.driverRepository.findByIds(driverIds);
    const driverMap = new Map(drivers.map(d => [d.id, { id: d.id, name: d.name }]));
    const dto: LeagueStandingsResultDTO = {
      standings,
      drivers: Array.from(driverMap.values()),
    };
    presenter.reset();
    presenter.present(dto);
  }
}