import { NextResponse } from 'next/server';
import { getServerSession } from 'next-auth';
import { authOptions } from "@/app/api/auth/options";
import { NotificationRegistry } from '@/lib/services/notifications/notification-registry';
import { logger } from '@/lib/logger';

// GET /api/notifications/count
export async function GET(request: Request) {
  try {
    // Authenticate user
    const session = await getServerSession(authOptions);
    if (!session || !session.user?.id) {
      return NextResponse.json(
        { error: "Not authenticated" },
        { status: 401 }
      );
    }

    const userId = session.user.id;
    const { searchParams } = new URL(request.url);
    const forceRefresh = searchParams.get('force') === 'true';
    
    const registry = NotificationRegistry.getInstance();
    
    // If force refresh, invalidate cache first
    if (forceRefresh) {
      await registry.invalidateCache(userId);
      logger.debug('[NOTIFICATIONS_COUNT_API] Cache invalidated for force refresh', { userId });
    }
    
    // Get aggregated count from registry
    const counts = await registry.getCount(userId);
    
    // Add Cache-Control header - rely on server-side cache, minimal client cache
    const response = NextResponse.json(counts);
    response.headers.set('Cache-Control', 'private, max-age=0, must-revalidate');
    return response;
  } catch (error: any) {
    logger.error('[NOTIFICATIONS_COUNT_API] Error', {
      error: error instanceof Error ? error.message : String(error),
    });
    return NextResponse.json(
      { error: "Internal server error", message: error.message },
      { status: 500 }
    );
  }
}