Switch analytics from PostHog to Firebase

apps/mobile/GoogleService-Info.plist

@@ -17,7 +17,7 @@
 	<key>IS_ADS_ENABLED</key>
 	<false></false>
 	<key>IS_ANALYTICS_ENABLED</key>
-	<false></false>
+	<true></true>
 	<key>IS_APPINVITE_ENABLED</key>
 	<true></true>
 	<key>IS_GCM_ENABLED</key>

apps/mobile/android/app/build.gradle

@@ -93,8 +93,8 @@ android {
         applicationId 'com.sauci.app'
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 22
-        versionName "1.0.1"
+        versionCode 24
+        versionName "1.0.2"
     }
     signingConfigs {
         debug {

apps/mobile/android/gradle.properties

@@ -57,3 +57,6 @@ expo.useLegacyPackaging=false
 
 android.targetSdkVersion=35
 android.extraMavenRepos=[]
+
+# Enable 16 KB page size support (required by Google Play for API 35+)
+android.bundle.pageAlignment=16kb

apps/mobile/app.json

@@ -2,7 +2,7 @@
   "expo": {
     "name": "Sauci",
     "slug": "sauci",
-    "version": "1.0.1",
+    "version": "1.0.2",
     "orientation": "portrait",
     "icon": "./assets/icon.png",
     "scheme": "app.sauci",
@@ -18,6 +18,7 @@
       "bundleIdentifier": "com.sauci.app",
       "buildNumber": "30",
       "usesAppleSignIn": true,
+      "googleServicesFile": "./GoogleService-Info.plist",
       "infoPlist": {
         "UIBackgroundModes": [
           "remote-notification"
@@ -176,7 +177,7 @@
         "backgroundColor": "#1a1a2e"
       },
       "package": "com.sauci.app",
-      "versionCode": 22,
+      "versionCode": 24,
       "googleServicesFile": "./google-services.json",
       "permissions": [
         "RECEIVE_BOOT_COMPLETED",
@@ -197,6 +198,9 @@
         {
           "android": {
             "targetSdkVersion": 35
+          },
+          "ios": {
+            "useFrameworks": "static"
           }
         }
       ],

apps/mobile/package.json

@@ -22,6 +22,8 @@
     "@expo/ngrok": "^4.1.0",
     "@expo/vector-icons": "~14.0.4",
     "@react-native-async-storage/async-storage": "1.23.1",
+    "@react-native-firebase/analytics": "^23.8.2",
+    "@react-native-firebase/app": "^23.8.2",
     "@react-native-google-signin/google-signin": "^16.1.1",
     "@react-navigation/bottom-tabs": "^7.0.0",
     "@react-navigation/native": "^7.0.0",
@@ -53,7 +55,6 @@
     "expo-router": "~4.0.0",
     "expo-secure-store": "~14.0.0",
     "expo-status-bar": "~2.0.0",
-    "posthog-react-native": "^4.17.1",
     "react": "18.3.1",
     "react-dom": "18.3.1",
     "react-native": "0.76.9",

apps/mobile/src/lib/analytics.ts

@@ -1,7 +1,31 @@
-import PostHog from "posthog-react-native";
+import { getApp } from "@react-native-firebase/app";
+import {
+  getAnalytics,
+  logEvent as firebaseLogEvent,
+  setUserId as firebaseSetUserId,
+  setUserProperty,
+  setAnalyticsCollectionEnabled,
+  resetAnalyticsData,
+  FirebaseAnalyticsTypes,
+} from "@react-native-firebase/analytics";
 
-let posthog: PostHog | null = null;
 let isInitialized = false;
+let analyticsInstance: FirebaseAnalyticsTypes.Module | null = null;
+
+function getAnalyticsInstance(): FirebaseAnalyticsTypes.Module | null {
+  if (analyticsInstance) {
+    return analyticsInstance;
+  }
+
+  try {
+    const app = getApp();
+    analyticsInstance = getAnalytics(app);
+    return analyticsInstance;
+  } catch (error) {
+    console.warn("[Analytics] Failed to get analytics instance:", error);
+    return null;
+  }
+}
 
 export async function initAnalytics() {
   if (isInitialized) {
@@ -9,30 +33,19 @@ export async function initAnalytics() {
   }
 
   // Skip initialization in non-RN environments (e.g., during tsc/Node.js)
-  // AsyncStorage requires window to be defined
   if (typeof window === "undefined" && typeof global !== "undefined" && !("__BUNDLE_START_TIME__" in global)) {
     return;
   }
 
-  const apiKey = process.env.EXPO_PUBLIC_POSTHOG_API_KEY;
-  const host = process.env.EXPO_PUBLIC_POSTHOG_HOST || "https://us.i.posthog.com";
-
-  if (!apiKey) {
-    console.warn("[Analytics] PostHog API key not configured");
-    return;
-  }
-
   try {
-    posthog = new PostHog(apiKey, {
-      host,
-      // Disable automatic capture in production for privacy
-      captureAppLifecycleEvents: true,
-    });
-
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      await setAnalyticsCollectionEnabled(analytics, true);
       isInitialized = true;
-    console.log("[Analytics] PostHog initialized");
+      console.log("[Analytics] Firebase Analytics initialized");
+    }
   } catch (error) {
-    console.warn("[Analytics] Failed to initialize PostHog:", error);
+    console.warn("[Analytics] Failed to initialize Firebase Analytics:", error);
   }
 }
 
@@ -43,7 +56,10 @@ export function logEvent(
 ) {
   try {
     if (__DEV__) console.log("[Analytics] Event:", name, params);
-    posthog?.capture(name, params);
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      firebaseLogEvent(analytics, name, params);
+    }
   } catch (error) {
     console.warn("[Analytics] Failed to log event:", error);
   }
@@ -53,7 +69,10 @@ export function logEvent(
 export function setUserId(userId: string) {
   try {
     if (__DEV__) console.log("[Analytics] Set user ID:", userId);
-    posthog?.identify(userId);
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      firebaseSetUserId(analytics, userId);
+    }
   } catch (error) {
     console.warn("[Analytics] Failed to set user ID:", error);
   }
@@ -63,7 +82,11 @@ export function setUserId(userId: string) {
 export function clearUserId() {
   try {
     if (__DEV__) console.log("[Analytics] Cleared user ID");
-    posthog?.reset();
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      firebaseSetUserId(analytics, null);
+      resetAnalyticsData(analytics);
+    }
   } catch (error) {
     console.warn("[Analytics] Failed to clear user ID:", error);
   }
@@ -75,14 +98,13 @@ export function setUserProperties(
 ) {
   try {
     if (__DEV__) console.log("[Analytics] Set user properties:", properties);
-    // Filter out null values for PostHog
-    const filteredProps: Record<string, string> = {};
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      // Firebase Analytics requires setting user properties one at a time
       for (const [key, value] of Object.entries(properties)) {
-      if (value !== null) {
-        filteredProps[key] = value;
+        setUserProperty(analytics, key, value);
       }
     }
-    posthog?.capture("$set", { $set: filteredProps });
   } catch (error) {
     console.warn("[Analytics] Failed to set user properties:", error);
   }
@@ -92,7 +114,13 @@ export function setUserProperties(
 export function logScreenView(screenName: string, screenClass?: string) {
   try {
     if (__DEV__) console.log("[Analytics] Screen view:", screenName);
-    posthog?.screen(screenName, { screen_class: screenClass ?? screenName });
+    const analytics = getAnalyticsInstance();
+    if (analytics) {
+      firebaseLogEvent(analytics, "screen_view", {
+        screen_name: screenName,
+        screen_class: screenClass ?? screenName,
+      });
+    }
   } catch (error) {
     console.warn("[Analytics] Failed to log screen view:", error);
   }
@@ -100,11 +128,9 @@ export function logScreenView(screenName: string, screenClass?: string) {
 
 // Flush events (useful before app backgrounding)
 export function flush() {
-  try {
-    posthog?.flush();
-  } catch (error) {
-    console.warn("[Analytics] Failed to flush:", error);
-  }
+  // Firebase Analytics batches and sends events automatically
+  // No manual flush needed, but we keep the function for API compatibility
+  if (__DEV__) console.log("[Analytics] Flush called (no-op for Firebase)");
 }
 
 // Pre-defined event helpers for common actions

apps/mobile/src/test/setup.ts

@@ -120,16 +120,15 @@ jest.mock('base64-arraybuffer', () => ({
     decode: jest.fn(() => new ArrayBuffer(0)),
 }));
 
-jest.mock('posthog-react-native', () => {
-    return class PostHog {
-        capture = jest.fn();
-        identify = jest.fn();
-        reset = jest.fn();
-        screen = jest.fn();
-        flush = jest.fn();
+jest.mock('@react-native-firebase/app', () => ({
+    getApp: jest.fn(() => ({})),
+}));
 
-        constructor() {
-            // no-op
-        }
-    };
-});
+jest.mock('@react-native-firebase/analytics', () => ({
+    getAnalytics: jest.fn(() => ({})),
+    logEvent: jest.fn(),
+    setUserId: jest.fn(),
+    setUserProperty: jest.fn(),
+    setAnalyticsCollectionEnabled: jest.fn(() => Promise.resolve()),
+    resetAnalyticsData: jest.fn(),
+}));