Phase 7C User Delete

PlotLine/Services/SubscriptionServices.cs

@@ -6,6 +6,7 @@ namespace PlotLine.Services;
 public interface ISubscriptionService
 {
     Task<UserSubscriptionDetail?> GetCurrentSubscriptionAsync(int userId);
+    Task<bool> HasPaidBillingRiskAsync(int userId);
     Task<SubscriptionLevel?> GetSubscriptionLevelAsync(int subscriptionLevelId);
     Task<IReadOnlyList<SubscriptionLevel>> GetActiveSubscriptionLevelsAsync();
     Task<SubscriptionLimitResult> CanCreateBookAsync(int userId);
@@ -25,6 +26,12 @@ public sealed class SubscriptionService(ISubscriptionRepository subscriptions, I
     public Task<UserSubscriptionDetail?> GetCurrentSubscriptionAsync(int userId) =>
         subscriptions.GetCurrentSubscriptionAsync(userId);
 
+    public async Task<bool> HasPaidBillingRiskAsync(int userId)
+    {
+        var subscription = await subscriptions.GetCurrentSubscriptionAsync(userId);
+        return HasPaidBillingRisk(subscription, DateTime.UtcNow);
+    }
+
     public Task<SubscriptionLevel?> GetSubscriptionLevelAsync(int subscriptionLevelId) =>
         subscriptions.GetSubscriptionLevelAsync(subscriptionLevelId);
 
@@ -121,6 +128,36 @@ public sealed class SubscriptionService(ISubscriptionRepository subscriptions, I
     }
 
     private static long ToBytes(int megabytes) => megabytes * 1024L * 1024L;
+
+    internal static bool HasPaidBillingRisk(UserSubscriptionDetail? subscription, DateTime utcNow)
+    {
+        if (subscription is null || string.IsNullOrWhiteSpace(subscription.StripeSubscriptionId))
+        {
+            return false;
+        }
+
+        var stripeStatus = (subscription.StripeStatus ?? string.Empty).Trim().ToLowerInvariant();
+        if (stripeStatus is "canceled" or "cancelled" or "incomplete_expired")
+        {
+            return false;
+        }
+
+        if (subscription.CancelAtPeriodEnd
+            && (!subscription.CurrentPeriodEndUTC.HasValue || subscription.CurrentPeriodEndUTC.Value > utcNow))
+        {
+            return true;
+        }
+
+        if (subscription.CurrentPeriodEndUTC.HasValue
+            && subscription.CurrentPeriodEndUTC.Value <= utcNow
+            && stripeStatus is "ended" or "expired" or "inactive")
+        {
+            return false;
+        }
+
+        return stripeStatus is "active" or "trialing" or "past_due" or "unpaid" or "incomplete" or "paused"
+            || string.IsNullOrWhiteSpace(stripeStatus);
+    }
 }
 
 public sealed class SubscriptionLimitException(string message) : InvalidOperationException(message);