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src/hooks/useUserPreferences.js

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+import { useCallback, useEffect, useState } from 'react';
+
+const PREFERENCES_ENDPOINT = '/api/user/preferences';
+const LOCATION_ENDPOINT = '/api/user/preferences/location';
+
+const useUserPreferences = ({ authorizedFetch, sessionToken }) => {
+  const [preferences, setPreferences] = useState(null);
+  const [loading, setLoading] = useState(false);
+  const [saving, setSaving] = useState(false);
+  const [error, setError] = useState('');
+
+  const loadPreferences = useCallback(async () => {
+    if (!sessionToken || !authorizedFetch) {
+      setPreferences(null);
+      return;
+    }
+    setLoading(true);
+    setError('');
+    try {
+      const response = await authorizedFetch(PREFERENCES_ENDPOINT);
+      if (!response.ok) {
+        throw new Error(`HTTP ${response.status}`);
+      }
+      const data = await response.json();
+      setPreferences(data);
+    } catch (err) {
+      setError(`Einstellungen konnten nicht geladen werden: ${err.message}`);
+    } finally {
+      setLoading(false);
+    }
+  }, [authorizedFetch, sessionToken]);
+
+  const updateLocation = useCallback(
+    async (coords) => {
+      if (!sessionToken || !authorizedFetch) {
+        return false;
+      }
+      setSaving(true);
+      setError('');
+      try {
+        const payload =
+          coords && typeof coords.lat === 'number' && typeof coords.lon === 'number'
+            ? { lat: coords.lat, lon: coords.lon }
+            : { lat: null, lon: null };
+        const response = await authorizedFetch(LOCATION_ENDPOINT, {
+          method: 'POST',
+          headers: { 'Content-Type': 'application/json' },
+          body: JSON.stringify(payload)
+        });
+        if (!response.ok) {
+          throw new Error(`HTTP ${response.status}`);
+        }
+        const data = await response.json();
+        setPreferences((prev) => ({
+          ...(prev || {}),
+          location: data.location || null
+        }));
+        return true;
+      } catch (err) {
+        setError(`Standort konnte nicht aktualisiert werden: ${err.message}`);
+        return false;
+      } finally {
+        setSaving(false);
+      }
+    },
+    [authorizedFetch, sessionToken]
+  );
+
+  useEffect(() => {
+    if (sessionToken) {
+      loadPreferences();
+    } else {
+      setPreferences(null);
+    }
+  }, [sessionToken, loadPreferences]);
+
+  return {
+    preferences,
+    loading,
+    saving,
+    error,
+    loadPreferences,
+    updateLocation
+  };
+};
+
+export default useUserPreferences;