import type { UserDto, DashboardStats, UserListResponse } from '@/lib/api/admin/AdminApiClient';
import { AdminUserViewModel, DashboardStatsViewModel, UserListViewModel } from '@/lib/view-models/AdminUserViewModel';

/**
 * AdminViewModelService
 * 
 * Service layer responsible for mapping API DTOs to View Models.
 * This is where the transformation from API data to UI-ready state happens.
 */
export class AdminViewModelService {
  /**
   * Map a single user DTO to a View Model
   */
  static mapUser(dto: UserDto): AdminUserViewModel {
    return new AdminUserViewModel(dto);
  }

  /**
   * Map an array of user DTOs to View Models
   */
  static mapUsers(dtos: UserDto[]): AdminUserViewModel[] {
    return dtos.map(dto => this.mapUser(dto));
  }

  /**
   * Map dashboard stats DTO to View Model
   */
  static mapDashboardStats(dto: DashboardStats): DashboardStatsViewModel {
    return new DashboardStatsViewModel(dto);
  }

  /**
   * Map user list response to View Model
   */
  static mapUserList(response: UserListResponse): UserListViewModel {
    return new UserListViewModel({
      users: response.users,
      total: response.total,
      page: response.page,
      limit: response.limit,
      totalPages: response.totalPages,
    });
  }
}