import { useEffect, useState } from 'react';
import { useOnlineStatus } from '@/hooks/useOnlineStatus';
import { offlineQueue } from '@/services/offlineQueue';
import { WifiOff, Loader2, List } from 'lucide-react';
import { hasRecentNetworkError } from '@/utils/networkErrorTracker';
import { OfflineQueueManager } from './OfflineQueueManager';

/**
 * Composant pour afficher un indicateur de mode hors ligne avec nombre de requêtes en attente
 */
export function OfflineIndicator() {
  const isOnline = useOnlineStatus();
  const [queueSize, setQueueSize] = useState(0);
  const [isProcessing, setIsProcessing] = useState(false);
  const [hasNetworkError, setHasNetworkError] = useState(false);
  const [showQueueManager, setShowQueueManager] = useState(false);
  const [shouldShowSyncBar, setShouldShowSyncBar] = useState(false);

  // Mettre à jour la taille de la file d'attente
  useEffect(() => {
    const updateQueueSize = () => {
      const size = offlineQueue.getQueueSize();
      // #region agent log
      // fetch('http://127.0.0.1:7242/ingest/09c5ea5e-2380-4cc3-92aa-d26f3b3d26f6',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'OfflineIndicator.tsx:updateQueueSize',message:'Queue size updated',data:{queueSize:size,isOnline},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'C'})}).catch(()=>{});
      // #endregion
      setQueueSize(size);
    };

    // Mettre à jour immédiatement
    updateQueueSize();

    // Mettre à jour toutes les secondes
    const interval = setInterval(updateQueueSize, 1000);

    return () => clearInterval(interval);
  }, []);

  // Vérifier si la file est en cours de traitement
  useEffect(() => {
    if (isOnline && queueSize > 0) {
      setIsProcessing(true);
      // Vérifier périodiquement si le traitement est terminé
      const checkProcessing = setInterval(() => {
        const currentSize = offlineQueue.getQueueSize();
        if (currentSize === 0) {
          setIsProcessing(false);
          clearInterval(checkProcessing);
        }
      }, 500);
      return () => clearInterval(checkProcessing);
    } else {
      setIsProcessing(false);
      return undefined;
    }
  }, [isOnline, queueSize]);

  // Check for recent network errors
  useEffect(() => {
    const checkNetworkError = () => {
      setHasNetworkError(hasRecentNetworkError());
    };

    // Check immediately
    checkNetworkError();

    // Check periodically (every 2 seconds) to update when error expires
    const interval = setInterval(checkNetworkError, 2000);

    return () => clearInterval(interval);
  }, []);

  // FIX: Délai avant d'afficher la barre de synchronisation pour éviter les flashs
  useEffect(() => {
    // #region agent log
    // fetch('http://127.0.0.1:7242/ingest/09c5ea5e-2380-4cc3-92aa-d26f3b3d26f6',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'OfflineIndicator.tsx:useEffect',message:'Sync bar effect triggered',data:{isProcessing,queueSize,isOnline,shouldShowSyncBar},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'B'})}).catch(()=>{});
    // #endregion
    if (isProcessing && queueSize > 0 && isOnline) {
      const timer = setTimeout(() => {
        // #region agent log
        // fetch('http://127.0.0.1:7242/ingest/09c5ea5e-2380-4cc3-92aa-d26f3b3d26f6',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'OfflineIndicator.tsx:setTimeout',message:'Setting shouldShowSyncBar to true',data:{queueSize,isProcessing},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'B'})}).catch(()=>{});
        // #endregion
        setShouldShowSyncBar(true);
      }, 500);
      return () => {
        clearTimeout(timer);
        setShouldShowSyncBar(false);
      };
    } else {
      setShouldShowSyncBar(false);
      return undefined;
    }
  }, [isProcessing, queueSize, isOnline]);

  // Ne rien afficher si en ligne, aucune requête en attente, et pas d'erreur réseau récente
  if (isOnline && queueSize === 0 && !isProcessing && !hasNetworkError) {
    return null;
  }

  // Mode hors ligne ou erreur réseau récente
  if (!isOnline || hasNetworkError) {
    return (
      <>
        <div className="fixed top-0 left-0 right-0 bg-destructive/90 backdrop-blur-sm text-foreground px-4 py-2.5 text-sm z-50 flex items-center justify-center gap-2 shadow-[0_4px_12px_rgba(26,26,30,0.15)]">
          <WifiOff className="w-4 h-4" />
          <span>
            Mode hors ligne
            {queueSize > 0 && (
              <span className="ml-2 font-semibold">
                - {queueSize} {queueSize === 1 ? 'requête' : 'requêtes'} en
                attente
              </span>
            )}
          </span>
          {queueSize > 0 && (
            <button
              onClick={() => setShowQueueManager(true)}
              className="ml-3 px-2 py-1 bg-white/10 hover:bg-white/20 rounded border border-white/20 transition-colors flex items-center gap-1.5 text-xs font-medium"
              title="View queued requests"
            >
              <List className="w-3.5 h-3.5" />
              View Queue
            </button>
          )}
        </div>
        <OfflineQueueManager
          open={showQueueManager}
          onClose={() => setShowQueueManager(false)}
        />
      </>
    );
  }

  // En ligne mais traitement de la file en cours
  // FIX: Ne pas afficher la barre si les requêtes sont rapidement traitées (moins de 500ms)
  // Cela évite d'afficher la barre pour des requêtes qui sont déjà en cours de traitement
  // #region agent log
  if (isProcessing && queueSize > 0) {
    // fetch('http://127.0.0.1:7242/ingest/09c5ea5e-2380-4cc3-92aa-d26f3b3d26f6',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'OfflineIndicator.tsx:123',message:'Checking sync bar display',data:{isProcessing,queueSize,shouldShowSyncBar,willShow:shouldShowSyncBar},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'B'})}).catch(()=>{});
  }
  // #endregion
  if (isProcessing && queueSize > 0 && shouldShowSyncBar) {
    return (
      <>
        <div className="fixed top-0 left-0 right-0 bg-primary/90 backdrop-blur-sm text-foreground px-4 py-2.5 text-sm z-50 flex items-center justify-center gap-2 shadow-[0_4px_12px_rgba(26,26,30,0.15)]">
          <Loader2 className="w-4 h-4 animate-spin" />
          <span>
            Synchronisation en cours
            {queueSize > 0 && (
              <span className="ml-2 font-semibold">
                - {queueSize} {queueSize === 1 ? 'requête' : 'requêtes'} restante
                {queueSize > 1 ? 's' : ''}
              </span>
            )}
          </span>
          {queueSize > 0 && (
            <>
              <button
                onClick={async () => {
                  // #region agent log
                  // fetch('http://127.0.0.1:7242/ingest/09c5ea5e-2380-4cc3-92aa-d26f3b3d26f6',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({location:'OfflineIndicator.tsx:clearQueue',message:'User clicked clear queue',data:{queueSize},timestamp:Date.now(),sessionId:'debug-session',runId:'run1',hypothesisId:'C'})}).catch(()=>{});
                  // #endregion
                  await offlineQueue.clearQueue();
                  setQueueSize(0);
                }}
                className="ml-2 px-2 py-1 bg-destructive/20 hover:bg-destructive/30 rounded border border-destructive/30 transition-colors flex items-center gap-1.5 text-xs font-medium"
                title="Clear queued requests"
              >
                Clear Queue
              </button>
              <button
                onClick={() => setShowQueueManager(true)}
                className="ml-2 px-2 py-1 bg-background/20 hover:bg-background/30 rounded border border-border/30 transition-colors flex items-center gap-1.5 text-xs font-medium"
                title="View queued requests"
              >
                <List className="w-3.5 h-3.5" />
                View Queue
              </button>
            </>
          )}
        </div>
        <OfflineQueueManager
          open={showQueueManager}
          onClose={() => setShowQueueManager(false)}
        />
      </>
    );
  }

  return null;
}