import { LeagueRepository } from '../ports/LeagueRepository';
import { LeagueRosterQuery } from '../ports/LeagueRosterQuery';
import { LeagueEventPublisher, LeagueRosterAccessedEvent } from '../ports/LeagueEventPublisher';

export interface LeagueRosterResult {
  leagueId: string;
  members: Array<{
    driverId: string;
    name: string;
    role: 'owner' | 'admin' | 'steward' | 'member';
    joinDate: Date;
  }>;
  pendingRequests: Array<{
    requestId: string;
    driverId: string;
    name: string;
    requestDate: Date;
  }>;
  stats: {
    adminCount: number;
    driverCount: number;
  };
}

export class GetLeagueRosterUseCase {
  constructor(
    private readonly leagueRepository: LeagueRepository,
    private readonly eventPublisher: LeagueEventPublisher,
  ) {}

  async execute(query: LeagueRosterQuery): Promise<LeagueRosterResult> {
    // Validate query
    if (!query.leagueId || query.leagueId.trim() === '') {
      throw new Error('League ID is required');
    }

    // Find league
    const league = await this.leagueRepository.findById(query.leagueId);
    if (!league) {
      throw new Error(`League with id ${query.leagueId} not found`);
    }

    // Get league members (simplified - in real implementation would get from membership repository)
    const members = await this.leagueRepository.getLeagueMembers(query.leagueId);
    
    // Get pending requests (simplified)
    const pendingRequests = await this.leagueRepository.getPendingRequests(query.leagueId);

    // Calculate stats
    const adminCount = members.filter(m => m.role === 'owner' || m.role === 'admin').length;
    const driverCount = members.filter(m => m.role === 'member').length;

    // Emit event
    const event: LeagueRosterAccessedEvent = {
      type: 'LeagueRosterAccessedEvent',
      leagueId: query.leagueId,
      timestamp: new Date(),
    };
    await this.eventPublisher.emitLeagueRosterAccessed(event);

    return {
      leagueId: query.leagueId,
      members: members.map(m => ({
        driverId: m.driverId,
        name: m.name,
        role: m.role,
        joinDate: m.joinDate,
      })),
      pendingRequests: pendingRequests.map(r => ({
        requestId: r.id,
        driverId: r.driverId,
        name: r.name,
        requestDate: r.requestDate,
      })),
      stats: {
        adminCount,
        driverCount,
      },
    };
  }
}