refactor

core/racing/application/use-cases/GetLeagueStandingsUseCase.ts

@@ -1,11 +1,8 @@
 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';
+import type { LeagueStandingsViewModel } from '../presenters/ILeagueStandingsPresenter';
+import { Result } from '@core/shared/application/Result';
+import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';
 
 export interface GetLeagueStandingsUseCaseParams {
   leagueId: string;
@@ -13,12 +10,8 @@ export interface GetLeagueStandingsUseCaseParams {
 
 /**
  * Use Case for retrieving league standings.
- * Orchestrates domain logic and delegates presentation to the presenter.
  */
-export class GetLeagueStandingsUseCase
-  implements
-    UseCase<GetLeagueStandingsUseCaseParams, LeagueStandingsResultDTO, LeagueStandingsViewModel, ILeagueStandingsPresenter>
-{
+export class GetLeagueStandingsUseCase {
   constructor(
     private readonly standingRepository: IStandingRepository,
     private readonly driverRepository: IDriverRepository,
@@ -26,17 +19,25 @@ export class GetLeagueStandingsUseCase
 
   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);
+  ): Promise<Result<LeagueStandingsViewModel, ApplicationErrorCode<'REPOSITORY_ERROR'>>> {
+    try {
+      const standings = await this.standingRepository.findByLeagueId(params.leagueId);
+      const driverIds = [...new Set(standings.map(s => s.driverId))];
+      const driverPromises = driverIds.map(id => this.driverRepository.findById(id));
+      const driverResults = await Promise.all(driverPromises);
+      const drivers = driverResults.filter((d): d is NonNullable<typeof d> => d !== null);
+      const driverMap = new Map(drivers.map(d => [d.id, { id: d.id, name: d.name }]));
+      const viewModel: LeagueStandingsViewModel = {
+        standings: standings.map(s => ({
+          driverId: s.driverId,
+          driver: driverMap.get(s.driverId)!,
+          points: s.points,
+          rank: s.position,
+        })),
+      };
+      return Result.ok(viewModel);
+    } catch {
+      return Result.err({ code: 'REPOSITORY_ERROR', message: 'Failed to fetch league standings' });
+    }
   }
 }