import type { Logger, UseCaseOutputPort } from '@core/shared/application';
import { Result } from '@core/shared/application/Result';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';
import type { League } from '../../domain/entities/League';
import type { Race } from '../../domain/entities/Race';
import type { ILeagueRepository } from '../../domain/repositories/ILeagueRepository';
import type { IRaceRepository } from '../../domain/repositories/IRaceRepository';

export type GetLeagueScheduleErrorCode =
  | 'LEAGUE_NOT_FOUND'
  | 'REPOSITORY_ERROR';

export interface GetLeagueScheduleInput {
  leagueId: string;
}

export interface LeagueScheduledRace {
  race: Race;
}

export interface GetLeagueScheduleResult {
  league: League;
  races: LeagueScheduledRace[];
}

export class GetLeagueScheduleUseCase {
  constructor(
    private readonly leagueRepository: ILeagueRepository,
    private readonly raceRepository: IRaceRepository,
    private readonly logger: Logger,
    private readonly output: UseCaseOutputPort<GetLeagueScheduleResult>,
  ) {}

  async execute(
    input: GetLeagueScheduleInput,
  ): Promise<
    Result<void, ApplicationErrorCode<GetLeagueScheduleErrorCode, { message: string }>>
  > {
    this.logger.debug('Fetching league schedule', { input });
    const { leagueId } = input;

    try {
      const league = await this.leagueRepository.findById(leagueId);
      if (!league) {
        this.logger.warn('League not found when fetching schedule', { leagueId });
        return Result.err({
          code: 'LEAGUE_NOT_FOUND',
          details: { message: 'League not found' },
        });
      }

      const races = await this.raceRepository.findByLeagueId(leagueId);

      const scheduledRaces: LeagueScheduledRace[] = races.map(race => ({
        race,
      }));

      const result: GetLeagueScheduleResult = {
        league,
        races: scheduledRaces,
      };

      this.output.present(result);

      return Result.ok(undefined);
    } catch (error) {
      this.logger.error(
        'Failed to load league schedule due to an unexpected error',
        error instanceof Error ? error : new Error('Unknown error'),
      );

      return Result.err({
        code: 'REPOSITORY_ERROR',
        details: {
          message:
            error instanceof Error
              ? error.message
              : 'Failed to load league schedule',
        },
      });
    }
  }
}