import { useEffect } from 'react';
import { useAuth } from '@/hooks/useAuth';
import { useUnitPreferences } from '@/hooks/useUnitPreferences';

function isLocalStorageAvailable(): boolean {
  try {
    if (typeof window === 'undefined' || typeof localStorage === 'undefined') {
      return false;
    }
    const testKey = '__localStorage_test__';
    localStorage.setItem(testKey, 'test');
    localStorage.removeItem(testKey);
    return true;
  } catch {
    return false;
  }
}

export function useLocationAutoDetect() {
  const { user } = useAuth();
  const { preferences, autoDetectPreferences, loading } = useUnitPreferences();

  useEffect(() => {
    // Only run auto-detection after preferences have loaded
    if (loading) return;
    
    // Check if localStorage is available
    if (!isLocalStorageAvailable()) {
      console.warn('localStorage is not available, skipping location auto-detection');
      return;
    }
    
    // Check if we've already attempted detection
    const hasAttemptedDetection = localStorage.getItem('location_detection_attempted');
    
    // Auto-detect if we haven't attempted it yet and auto_detect is enabled
    if (preferences.auto_detect && !hasAttemptedDetection) {
      autoDetectPreferences().then(() => {
        if (isLocalStorageAvailable()) {
          localStorage.setItem('location_detection_attempted', 'true');
        }
      }).catch((error) => {
        console.error('❌ Failed to auto-detect location:', error);
        if (isLocalStorageAvailable()) {
          localStorage.setItem('location_detection_attempted', 'true');
        }
      });
    }
  }, [user, loading, preferences.auto_detect]);
}