Only check if subscription is valid if it has expired

This way we avoid extra network access.

lib/iap.dart

@@ -6,10 +6,18 @@ import 'package:gitjournal/.env.dart';
 
 class InAppPurchases {
   static void confirmProPurchase() async {
-    // FIXME: Only check this if pro mode is expired
+    var currentDt = DateTime.now().toUtc().toIso8601String();
+    var exp = Settings.instance.proExpirationDate;
+    if (exp.isNotEmpty && exp.compareTo(currentDt) > 0) {
+      print("Not checking PurchaseInfo as exp = $exp and cur = $currentDt");
+      return;
+    }
 
-    //Purchases.setDebugLogsEnabled(true);
-    await Purchases.setup(environment['revenueCat']);
+    Purchases.setDebugLogsEnabled(false);
+    await Purchases.setup(
+      environment['revenueCat'],
+      appUserId: Settings.instance.pseudoId,
+    );
 
     PurchaserInfo purchaserInfo = await Purchases.getPurchaserInfo();
     print("Got PurchaserInfo $purchaserInfo");
@@ -20,6 +28,9 @@ class InAppPurchases {
       Log.i("Pro mode changed to $isPro");
       Settings.instance.proMode = isPro;
       Settings.instance.save();
+    } else {
+      Settings.instance.proExpirationDate = purchaserInfo.latestExpirationDate;
+      Settings.instance.save();
     }
   }
 }

lib/screens/purchase_screen.dart

@@ -201,6 +201,8 @@ class PurchaseButton extends StatelessWidget {
       var isPro = purchaserInfo.entitlements.all["pro"].isActive;
       if (isPro) {
         Settings.instance.proMode = true;
+        Settings.instance.proExpirationDate =
+            purchaserInfo.latestExpirationDate;
         Settings.instance.save();
 
         getAnalytics().logEvent(

lib/settings.dart

@@ -35,6 +35,7 @@ class Settings {
   int version = 0;
 
   bool proMode = false;
+  String proExpirationDate = "";
 
   String _pseudoId;
   String get pseudoId => _pseudoId;
@@ -76,6 +77,8 @@ class Settings {
 
     version = pref.getInt("settingsVersion") ?? version;
     proMode = pref.getBool("proMode") ?? proMode;
+    proExpirationDate =
+        pref.getString("proExpirationDate") ?? proExpirationDate;
 
     _pseudoId = pref.getString("pseudoId");
     if (_pseudoId == null) {
@@ -103,6 +106,7 @@ class Settings {
         "markdownDefaultView", markdownDefaultView.toInternalString());
     pref.setBool("showNoteSummary", showNoteSummary);
     pref.setString("folderViewHeaderType", folderViewHeaderType);
+    pref.setString("proExpirationDate", proExpirationDate);
     pref.setInt("settingsVersion", version);
     pref.setBool("proMode", proMode);