import type { IRaceRegistrationRepository } from '@gridpilot/racing/domain/repositories/IRaceRegistrationRepository';
import type { ILeagueMembershipRepository } from '@gridpilot/racing/domain/repositories/ILeagueMembershipRepository';
import type { RaceRegistration } from '@gridpilot/racing/domain/entities/RaceRegistration';
import type { RegisterForRaceCommandDTO } from '../dto/RegisterForRaceCommandDTO';
import {
  BusinessRuleViolationError,
  PermissionDeniedError,
} from '../errors/RacingApplicationError';

export class RegisterForRaceUseCase {
  constructor(
    private readonly registrationRepository: IRaceRegistrationRepository,
    private readonly membershipRepository: ILeagueMembershipRepository,
  ) {}

  /**
   * Mirrors legacy registerForRace behavior:
   * - throws if already registered
   * - validates active league membership
   * - registers driver for race
   */
  async execute(command: RegisterForRaceCommandDTO): Promise<void> {
    const { raceId, leagueId, driverId } = command;

    const alreadyRegistered = await this.registrationRepository.isRegistered(raceId, driverId);
    if (alreadyRegistered) {
      throw new BusinessRuleViolationError('Already registered for this race');
    }

    const membership = await this.membershipRepository.getMembership(leagueId, driverId);
    if (!membership || membership.status !== 'active') {
      throw new PermissionDeniedError('NOT_ACTIVE_MEMBER', 'Must be an active league member to register for races');
    }

    const registration: RaceRegistration = {
      raceId,
      driverId,
      registeredAt: new Date(),
    };

    await this.registrationRepository.register(registration);
  }
}