add a shit ton of feature for the custom srs

lib/src/screens/custom_srs_screen.dart

@@ -15,6 +15,8 @@ class _CustomSrsScreenState extends State<CustomSrsScreen> with SingleTickerProv
   late TabController _tabController;
   final _deckRepository = CustomDeckRepository();
   List<CustomKanjiItem> _deck = [];
+  List<CustomKanjiItem> _reviewDeck = [];
+  bool _useKanji = false;
   final _quizScreenKeys = [
     GlobalKey<CustomQuizScreenState>(),
     GlobalKey<CustomQuizScreenState>(),
@@ -30,6 +32,7 @@ class _CustomSrsScreenState extends State<CustomSrsScreen> with SingleTickerProv
         final key = _quizScreenKeys[_tabController.index];
         key.currentState?.playAudio();
       }
+      setState(() {});
     });
     _loadDeck();
   }
@@ -42,16 +45,52 @@ class _CustomSrsScreenState extends State<CustomSrsScreen> with SingleTickerProv
 
   Future<void> _loadDeck() async {
     final deck = await _deckRepository.getCustomDeck();
+    final now = DateTime.now();
+    final reviewDeck = deck.where((item) {
+      if (!item.useInterval) {
+        return true;
+      }
+      return item.nextReview == null || item.nextReview!.isBefore(now);
+    }).toList();
+
     setState(() {
       _deck = deck;
+      _reviewDeck = reviewDeck;
     });
   }
 
+  Future<void> _updateCard(CustomKanjiItem item) async {
+    final index = _deck.indexWhere((element) => element.characters == item.characters);
+    if (index != -1) {
+      setState(() {
+        _deck[index] = item;
+        _reviewDeck.removeWhere((element) => element.characters == item.characters);
+      });
+      await _deckRepository.saveDeck(_deck);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
       appBar: AppBar(
         title: const Text('Custom SRS'),
+        actions: [
+          if (_tabController.index != 2)
+            Row(
+              children: [
+                const Text('Kanji'),
+                Switch(
+                  value: _useKanji,
+                  onChanged: (value) {
+                    setState(() {
+                      _useKanji = value;
+                    });
+                  },
+                ),
+              ],
+            ),
+        ],
         bottom: TabBar(
           controller: _tabController,
           tabs: const [
@@ -62,13 +101,33 @@ class _CustomSrsScreenState extends State<CustomSrsScreen> with SingleTickerProv
         ),
       ),
       body: _deck.isEmpty
-          ? const Center(child: CircularProgressIndicator())
-          : TabBarView(
+          ? const Center(child: Text('Add cards to start quizzing!'))
+          : _reviewDeck.isEmpty
+              ? const Center(child: Text('No cards due for review.'))
+              : TabBarView(
               controller: _tabController,
               children: [
-                CustomQuizScreen(key: _quizScreenKeys[0], deck: _deck, quizMode: CustomQuizMode.japaneseToEnglish),
-                CustomQuizScreen(key: _quizScreenKeys[1], deck: _deck, quizMode: CustomQuizMode.englishToJapanese),
-                CustomQuizScreen(key: _quizScreenKeys[2], deck: _deck, quizMode: CustomQuizMode.listeningComprehension),
+                CustomQuizScreen(
+                  key: _quizScreenKeys[0],
+                  deck: _reviewDeck,
+                  quizMode: CustomQuizMode.japaneseToEnglish,
+                  onCardReviewed: _updateCard,
+                  useKanji: _useKanji,
+                ),
+                CustomQuizScreen(
+                  key: _quizScreenKeys[1],
+                  deck: _reviewDeck,
+                  quizMode: CustomQuizMode.englishToJapanese,
+                  onCardReviewed: _updateCard,
+                  useKanji: _useKanji,
+                ),
+                CustomQuizScreen(
+                  key: _quizScreenKeys[2],
+                  deck: _reviewDeck,
+                  quizMode: CustomQuizMode.listeningComprehension,
+                  onCardReviewed: _updateCard,
+                  useKanji: _useKanji,
+                ),
               ],
             ),
       floatingActionButton: FloatingActionButton(