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import { useState, useEffect, useRef } from 'react';

interface CompetitionData {
  caseId: string;
  currentHighestBid: number;
  totalBidders: number;
  bidCount: number;
  lastUpdated: string;
}

interface UseCompetitionUpdatesProps {
  caseId: string;
  enabled?: boolean;
  pollInterval?: number; // in milliseconds
}

export const useCompetitionUpdates = ({ 
  caseId, 
  enabled = true, 
  pollInterval = 5000 
}: UseCompetitionUpdatesProps) => {
  const [data, setData] = useState<CompetitionData | null>(null);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const intervalRef = useRef<NodeJS.Timeout | null>(null);
  const lastDataRef = useRef<string>('');

  const fetchCompetitionData = async () => {
    if (!enabled || !caseId) return;

    try {
      setLoading(true);
      setError(null);

      const response = await fetch(`/api/public/cases/${caseId}/competition/status`);
      if (!response.ok) {
        throw new Error('Failed to fetch competition data');
      }

      const competitionData = await response.json();
      const dataString = JSON.stringify(competitionData);

      // Only update if data has changed
      if (dataString !== lastDataRef.current) {
        setData(competitionData);
        lastDataRef.current = dataString;
      }
    } catch (err) {
      setError(err instanceof Error ? err.message : 'Unknown error');
    } finally {
      setLoading(false);
    }
  };

  useEffect(() => {
    if (!enabled || !caseId) return;

    // Initial fetch
    fetchCompetitionData();

    // Set up polling
    intervalRef.current = setInterval(fetchCompetitionData, pollInterval);

    return () => {
      if (intervalRef.current) {
        clearInterval(intervalRef.current);
        intervalRef.current = null;
      }
    };
  }, [caseId, enabled, pollInterval]);

  const refresh = () => {
    fetchCompetitionData();
  };

  return {
    data,
    loading,
    error,
    refresh
  };
};