import { useQuery } from '@tanstack/react-query';
import { supabase } from '@/integrations/supabase/client';
import { queryKeys } from '@/lib/queryKeys';

export interface DatabaseHealth {
  status: 'healthy' | 'warning' | 'unhealthy';
  recentErrors: number;
  checked_at: string;
}

export function useDatabaseHealth() {
  return useQuery({
    queryKey: queryKeys.monitoring.databaseHealth(),
    queryFn: async () => {
      const threshold = new Date(Date.now() - 3600000); // 1 hour
      
      // Check for recent database errors
      const { count, error } = await supabase
        .from('request_metadata')
        .select('*', { count: 'exact', head: true })
        .eq('error_type', 'database_error')
        .gte('created_at', threshold.toISOString());

      if (error) {
        return {
          status: 'warning' as const,
          recentErrors: 0,
          checked_at: new Date().toISOString(),
        };
      }

      const errorCount = count || 0;
      
      return {
        status: errorCount > 10 ? 'unhealthy' : errorCount > 5 ? 'warning' : 'healthy',
        recentErrors: errorCount,
        checked_at: new Date().toISOString(),
      } as DatabaseHealth;
    },
    staleTime: 60000,
    refetchInterval: 120000,
  });
}