import { Injectable } from '@nestjs/common';
import { ListUsersUseCase, ListUsersInput } from '@core/admin/application/use-cases/ListUsersUseCase';
import { ListUsersPresenter, ListUsersViewModel } from './presenters/ListUsersPresenter';
import { GetDashboardStatsUseCase, GetDashboardStatsInput } from './use-cases/GetDashboardStatsUseCase';
import { DashboardStatsPresenter, DashboardStatsResponse } from './presenters/DashboardStatsPresenter';

@Injectable()
export class AdminService {
  constructor(
    private readonly listUsersUseCase: ListUsersUseCase,
    private readonly listUsersPresenter: ListUsersPresenter,
    private readonly getDashboardStatsUseCase: GetDashboardStatsUseCase,
    private readonly dashboardStatsPresenter: DashboardStatsPresenter,
  ) {}

  async listUsers(input: ListUsersInput): Promise<ListUsersViewModel> {
    const result = await this.listUsersUseCase.execute(input);

    if (result.isErr()) {
      const error = result.unwrapErr();
      throw new Error(`${error.code}: ${error.details.message}`);
    }

    return this.listUsersPresenter.getViewModel();
  }

  async getDashboardStats(input: GetDashboardStatsInput): Promise<DashboardStatsResponse> {
    this.dashboardStatsPresenter.reset();
    
    const result = await this.getDashboardStatsUseCase.execute(input);

    if (result.isErr()) {
      const error = result.unwrapErr();
      throw new Error(`${error.code}: ${error.details.message}`);
    }

    return this.dashboardStatsPresenter.responseModel;
  }
}