import type {
  ILeagueMembershipRepository,
} from '@gridpilot/racing/domain/repositories/ILeagueMembershipRepository';
import type { ILeagueRepository } from '@gridpilot/racing/domain/repositories/ILeagueRepository';
import type {
  LeagueMembership,
  MembershipRole,
} from '@gridpilot/racing/domain/entities/LeagueMembership';

export interface TransferLeagueOwnershipCommandDTO {
  leagueId: string;
  currentOwnerId: string;
  newOwnerId: string;
}

export class TransferLeagueOwnershipUseCase {
  constructor(
    private readonly leagueRepository: ILeagueRepository,
    private readonly membershipRepository: ILeagueMembershipRepository
  ) {}

  async execute(command: TransferLeagueOwnershipCommandDTO): Promise<void> {
    const { leagueId, currentOwnerId, newOwnerId } = command;

    const league = await this.leagueRepository.findById(leagueId);
    if (!league) {
      throw new Error('League not found');
    }

    if (league.ownerId !== currentOwnerId) {
      throw new Error('Only the current owner can transfer ownership');
    }

    const newOwnerMembership = await this.membershipRepository.getMembership(leagueId, newOwnerId);
    if (!newOwnerMembership || newOwnerMembership.status !== 'active') {
      throw new Error('New owner must be an active member of the league');
    }

    const currentOwnerMembership = await this.membershipRepository.getMembership(leagueId, currentOwnerId);
    
    await this.membershipRepository.saveMembership({
      ...newOwnerMembership,
      role: 'owner' as MembershipRole,
    });

    if (currentOwnerMembership) {
      await this.membershipRepository.saveMembership({
        ...currentOwnerMembership,
        role: 'admin' as MembershipRole,
      });
    }

    const updatedLeague = league.update({ ownerId: newOwnerId });
    await this.leagueRepository.update(updatedLeague);
  }
}