import { AdminApiClient } from '@/lib/api/admin/AdminApiClient';
import type { UserDto, DashboardStats, UserListResponse, ListUsersQuery } from '@/lib/api/admin/AdminApiClient';
import { Result } from '@/lib/contracts/Result';
import { ConsoleLogger } from '@/lib/infrastructure/logging/ConsoleLogger';
import { EnhancedErrorReporter } from '@/lib/infrastructure/EnhancedErrorReporter';
import { DomainError } from '@/lib/contracts/services/Service';

/**
 * Admin Service - DTO Only
 *
 * Returns raw API DTOs. No ViewModels or UX logic.
 * All client-side presentation logic must be handled by presenters/templates.
 * @server-safe
 */
export class AdminService {
  private apiClient: AdminApiClient;

  constructor() {
    const baseUrl = process.env.NEXT_PUBLIC_API_BASE_URL || 'http://localhost:3001';
    const logger = new ConsoleLogger();
    const errorReporter = new EnhancedErrorReporter(logger, {
      showUserNotifications: false,
      logToConsole: true,
      reportToExternal: process.env.NODE_ENV === 'production',
    });
    this.apiClient = new AdminApiClient(baseUrl, errorReporter, logger);
  }

  /**
   * Get dashboard statistics
   */
  async getDashboardStats(): Promise<Result<DashboardStats, DomainError>> {
    try {
      const result = await this.apiClient.getDashboardStats();
      return Result.ok(result);
    } catch (error) {
      console.error('AdminService.getDashboardStats failed:', error);
      
      if (error instanceof Error) {
        if (error.message.includes('403') || error.message.includes('401')) {
          return Result.err({ type: 'notFound', message: 'Access denied' });
        }
      }
      
      return Result.err({ type: 'serverError', message: 'Failed to fetch dashboard stats' });
    }
  }

  /**
   * List users with filtering and pagination
   */
  async listUsers(query: ListUsersQuery = {}): Promise<Result<UserListResponse, DomainError>> {
    try {
      const result = await this.apiClient.listUsers(query);
      return Result.ok(result);
    } catch (error) {
      console.error('AdminService.listUsers failed:', error);
      
      if (error instanceof Error) {
        if (error.message.includes('403') || error.message.includes('401')) {
          return Result.err({ type: 'notFound', message: 'Access denied' });
        }
      }
      
      return Result.err({ type: 'serverError', message: 'Failed to fetch users' });
    }
  }

  /**
   * Update user status
   */
  async updateUserStatus(userId: string, status: string): Promise<Result<UserDto, DomainError>> {
    try {
      const result = await this.apiClient.updateUserStatus(userId, status);
      return Result.ok(result);
    } catch (error) {
      console.error('AdminService.updateUserStatus failed:', error);
      
      if (error instanceof Error) {
        if (error.message.includes('403') || error.message.includes('401')) {
          return Result.err({ type: 'forbidden', message: 'Insufficient permissions' });
        }
      }
      
      return Result.err({ type: 'serverError', message: 'Failed to update user status' });
    }
  }

  /**
   * Delete a user (soft delete)
   */
  async deleteUser(userId: string): Promise<Result<void, DomainError>> {
    try {
      await this.apiClient.deleteUser(userId);
      return Result.ok(undefined);
    } catch (error) {
      console.error('AdminService.deleteUser failed:', error);
      
      if (error instanceof Error) {
        if (error.message.includes('403') || error.message.includes('401')) {
          return Result.err({ type: 'forbidden', message: 'Insufficient permissions' });
        }
      }
      
      return Result.err({ type: 'serverError', message: 'Failed to delete user' });
    }
  }
}