fix(anki): make quality of life improvements

WorterBuch/FlashcardHomeView.swift

@@ -22,6 +22,8 @@ struct FlashcardHomeView: View {
     @State private var showingSession = false
     @State private var showingStats = false
     @State private var session: FlashcardSession?
+    @State private var currentTime = Date()
+    @State private var timer: Timer?
     
     private var statistics: FlashcardStatistics {
         let tags = showAllTags ? nil : Array(selectedTagObjects)
@@ -40,6 +42,11 @@ struct FlashcardHomeView: View {
         return SpacedRepetitionEngine.getDueCards(in: viewContext, tags: tags)
     }
     
+    private var nextCardDate: Date? {
+        let tags = showAllTags ? nil : Array(selectedTagObjects)
+        return SpacedRepetitionEngine.getNextCardDate(in: viewContext, tags: tags)
+    }
+    
     var body: some View {
         NavigationView {
             ScrollView {
@@ -183,16 +190,30 @@ struct FlashcardHomeView: View {
                                     .font(.title3)
                                     .fontWeight(.semibold)
                                 
-                                Text("No cards due for review right now")
+                                if let nextDate = nextCardDate, nextDate > currentTime {
-                                    .font(.caption)
+                                    Text("Next card available in")
-                                    .foregroundColor(.secondary)
+                                        .font(.caption)
-                                
+                                        .foregroundColor(.secondary)
-                                if statistics.totalCards == 0 {
+                                    
+                                    Text(timeUntilNextCard(nextDate: nextDate))
+                                        .font(.title2)
+                                        .fontWeight(.bold)
+                                        .foregroundColor(.blue)
+                                        .monospacedDigit()
+                                } else if statistics.totalCards == 0 {
+                                    Text("No cards due for review right now")
+                                        .font(.caption)
+                                        .foregroundColor(.secondary)
+                                    
                                     Text("💡 Tip: Cards need both German word AND English translation to appear in flashcards")
                                         .font(.caption2)
                                         .foregroundColor(.orange)
                                         .multilineTextAlignment(.center)
                                         .padding(.top, 4)
+                                } else {
+                                    Text("No cards due for review right now")
+                                        .font(.caption)
+                                        .foregroundColor(.secondary)
                                 }
                             }
                             .frame(maxWidth: .infinity)
@@ -218,6 +239,12 @@ struct FlashcardHomeView: View {
                 }
             }
             .navigationTitle("Flashcards")
+            .onAppear {
+                startTimer()
+            }
+            .onDisappear {
+                stopTimer()
+            }
             .sheet(isPresented: $showingSession) {
                 if let session = session {
                     FlashcardSessionView(session: session)
@@ -244,6 +271,35 @@ struct FlashcardHomeView: View {
         session = FlashcardSession(cards: cards, context: viewContext)
         showingSession = true
     }
+    
+    private func startTimer() {
+        timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in
+            currentTime = Date()
+        }
+    }
+    
+    private func stopTimer() {
+        timer?.invalidate()
+        timer = nil
+    }
+    
+    private func timeUntilNextCard(nextDate: Date) -> String {
+        let timeInterval = nextDate.timeIntervalSince(currentTime)
+        
+        guard timeInterval > 0 else {
+            return "Available now!"
+        }
+        
+        let hours = Int(timeInterval) / 3600
+        let minutes = (Int(timeInterval) % 3600) / 60
+        let seconds = Int(timeInterval) % 60
+        
+        if hours > 0 {
+            return String(format: "%02d:%02d:%02d", hours, minutes, seconds)
+        } else {
+            return String(format: "%02d:%02d", minutes, seconds)
+        }
+    }
 }
 
 // MARK: - Stat Card

WorterBuch/SpacedRepetitionEngine.swift

@@ -163,6 +163,34 @@ class SpacedRepetitionEngine {
         }
     }
     
+    /// Get the date when the next card will become available
+    static func getNextCardDate(
+        in context: NSManagedObjectContext,
+        tags: [Tag]? = nil
+    ) -> Date? {
+        let fetchRequest: NSFetchRequest<VocabularyEntry> = VocabularyEntry.fetchRequest()
+        
+        // Filter by tags if provided
+        if let tags = tags, !tags.isEmpty {
+            fetchRequest.predicate = NSPredicate(format: "ANY tags IN %@", tags)
+        }
+        
+        do {
+            let allEntries = try context.fetch(fetchRequest)
+            
+            // Get all flashcard-ready entries that are NOT yet due
+            let futureCards = allEntries.filter { entry in
+                entry.isFlashcardReady && !entry.isDueForReview && entry.nextReviewDate != nil
+            }
+            
+            // Find the earliest next review date
+            return futureCards.compactMap { $0.nextReviewDate }.min()
+        } catch {
+            print("Error fetching next card date: \(error)")
+            return nil
+        }
+    }
+    
     /// Get overall statistics for flashcards
     static func getStatistics(
         in context: NSManagedObjectContext,