import type { TeamMembership, TeamRole } from '@gridpilot/racing/domain/types/TeamMembership';
import type { DriverDTO } from '@gridpilot/racing/application/dto/DriverDTO';
import { EntityMappers } from '@gridpilot/racing/application/mappers/EntityMappers';
import { getDriverRepository, getDriverStats } from '@/lib/di-container';

export interface TeamRosterMemberViewModel {
  driver: DriverDTO;
  role: TeamRole;
  joinedAt: string;
  rating: number | null;
  overallRank: number | null;
}

export interface TeamRosterViewModel {
  members: TeamRosterMemberViewModel[];
  averageRating: number;
}

/**
 * Presenter/facade for team roster.
 * Encapsulates repository and stats access so the TeamRoster component can remain a pure view.
 */
export async function getTeamRosterViewModel(
  memberships: TeamMembership[]
): Promise<TeamRosterViewModel> {
  const driverRepo = getDriverRepository();
  const allDrivers = await driverRepo.findAll();
  const members: TeamRosterMemberViewModel[] = [];

  for (const membership of memberships) {
    const driver = allDrivers.find((d) => d.id === membership.driverId);
    if (!driver) continue;

    const dto = EntityMappers.toDriverDTO(driver);
    if (!dto) continue;

    const stats = getDriverStats(membership.driverId);

    members.push({
      driver: dto,
      role: membership.role,
      joinedAt: membership.joinedAt.toISOString(),
      rating: stats?.rating ?? null,
      overallRank: typeof stats?.overallRank === 'number' ? stats.overallRank : null,
    });
  }

  const averageRating =
    members.length > 0
      ? Math.round(
          members.reduce((sum, m) => sum + (m.rating ?? 0), 0) / members.length
        )
      : 0;

  return {
    members,
    averageRating,
  };
}