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services/userPreferencesStore.js

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+const fs = require('fs');
+const path = require('path');
+
+const PREF_DIR = path.join(__dirname, '..', 'config');
+
+const DEFAULT_PREFERENCES = {
+  location: null
+};
+
+function ensureDir() {
+  if (!fs.existsSync(PREF_DIR)) {
+    fs.mkdirSync(PREF_DIR, { recursive: true });
+  }
+}
+
+function getPreferencesPath(profileId = 'shared') {
+  return path.join(PREF_DIR, `${profileId}-preferences.json`);
+}
+
+function sanitizeLocation(location) {
+  if (!location) {
+    return null;
+  }
+  const lat = Number(location.lat);
+  const lon = Number(location.lon);
+  if (!Number.isFinite(lat) || !Number.isFinite(lon)) {
+    return null;
+  }
+  if (lat < -90 || lat > 90 || lon < -180 || lon > 180) {
+    return null;
+  }
+  return {
+    lat,
+    lon,
+    updatedAt: Date.now()
+  };
+}
+
+function readPreferences(profileId) {
+  ensureDir();
+  const filePath = getPreferencesPath(profileId);
+  if (!fs.existsSync(filePath)) {
+    fs.writeFileSync(filePath, JSON.stringify(DEFAULT_PREFERENCES, null, 2));
+    return { ...DEFAULT_PREFERENCES };
+  }
+  try {
+    const raw = fs.readFileSync(filePath, 'utf8');
+    const parsed = JSON.parse(raw);
+    return {
+      location: sanitizeLocation(parsed.location) || null
+    };
+  } catch (error) {
+    console.error(`[PREFERENCES] Konnte Datei ${filePath} nicht lesen:`, error.message);
+    return { ...DEFAULT_PREFERENCES };
+  }
+}
+
+function writePreferences(profileId, patch = {}) {
+  const current = readPreferences(profileId);
+  const next = {
+    location:
+      patch.location === undefined
+        ? current.location
+        : sanitizeLocation(patch.location)
+  };
+  ensureDir();
+  const filePath = getPreferencesPath(profileId);
+  fs.writeFileSync(filePath, JSON.stringify(next, null, 2));
+  return next;
+}
+
+module.exports = {
+  readPreferences,
+  writePreferences
+};