import type { Logger, UseCaseOutputPort, UseCase } from '@core/shared/application';
import { Result } from '@core/shared/application/Result';
import type { ApplicationErrorCode } from '@core/shared/errors/ApplicationErrorCode';

export interface GetDashboardDataInput {}

export interface GetDashboardDataOutput {
  totalUsers: number;
  activeUsers: number;
  totalRaces: number;
  totalLeagues: number;
}

export type GetDashboardDataErrorCode = 'REPOSITORY_ERROR';

export class GetDashboardDataUseCase implements UseCase<GetDashboardDataInput, GetDashboardDataOutput, GetDashboardDataErrorCode> {
  constructor(
    private readonly logger: Logger,
  ) {}

  async execute(input: GetDashboardDataInput = {}): Promise<Result<GetDashboardDataOutput, ApplicationErrorCode<GetDashboardDataErrorCode, { message: string }>>> {
    try {
      // Placeholder implementation - would need repositories from identity and racing domains
      const totalUsers = 0;
      const activeUsers = 0;
      const totalRaces = 0;
      const totalLeagues = 0;

      this.logger.info('Dashboard data retrieved', {
        totalUsers,
        activeUsers,
        totalRaces,
        totalLeagues,
      });

      const result = Result.ok<GetDashboardDataOutput, ApplicationErrorCode<GetDashboardDataErrorCode, { message: string }>>({
        totalUsers,
        activeUsers,
        totalRaces,
        totalLeagues,
      });
      return result;
    } catch (error) {
      const err = error as Error;
      this.logger.error('Failed to get dashboard data', err);
      const result = Result.err<GetDashboardDataOutput, ApplicationErrorCode<GetDashboardDataErrorCode, { message: string }>>({
        code: 'REPOSITORY_ERROR',
        details: { message: err.message ?? 'Failed to get dashboard data' },
      });
      return result;
    }
  }
}