import { AdminApiClient } from '@/lib/api/admin/AdminApiClient';
import { PageQuery } from '@/lib/contracts/page-queries/PageQuery';
import { PageQueryResult } from '@/lib/contracts/page-queries/PageQueryResult';
import { EnhancedErrorReporter } from '@/lib/infrastructure/EnhancedErrorReporter';
import { ConsoleLogger } from '@/lib/infrastructure/logging/ConsoleLogger';
import { AdminService } from '@/lib/services/admin/AdminService';
import { AdminDashboardViewDataBuilder } from '@/lib/builders/view-data/AdminDashboardViewDataBuilder';
import { AdminDashboardViewData } from '@/lib/view-data/AdminDashboardViewData';

/**
 * AdminDashboardPageQuery
 *
 * Server-side composition for admin dashboard page.
 * Fetches dashboard statistics from API and transforms to View Data using builders.
 * 
 * Follows Clean Architecture: DTOs never leak into application code.
 */
export class AdminDashboardPageQuery implements PageQuery<AdminDashboardViewData, void> {
  async execute(): Promise<PageQueryResult<AdminDashboardViewData>> {
    try {
      // Create required dependencies
      const logger = new ConsoleLogger();
      const errorReporter = new EnhancedErrorReporter(logger, {
        showUserNotifications: false,
        logToConsole: true,
        reportToExternal: process.env.NODE_ENV === 'production',
      });

      const baseUrl = process.env.NEXT_PUBLIC_API_BASE_URL || 'http://localhost:3001';
      const apiClient = new AdminApiClient(baseUrl, errorReporter, logger);
      const adminService = new AdminService(apiClient);

      // Fetch dashboard stats (API DTO)
      const apiDto = await adminService.getDashboardStats();

      // Transform API DTO to View Data using builder
      const viewData = AdminDashboardViewDataBuilder.build(apiDto);

      return { status: 'ok', dto: viewData };
    } catch (error) {
      console.error('AdminDashboardPageQuery failed:', error);
      
      if (error instanceof Error && (error.message.includes('403') || error.message.includes('401'))) {
        return { status: 'notFound' };
      }
      
      return { status: 'error', errorId: 'admin_dashboard_fetch_failed' };
    }
  }
}