updated book folder structure

lib/screens/book_screen.dart

@@ -100,25 +100,36 @@ Color _getColorFromName(String colorName) {
     Map<String, List<File>> groupedFiles = {};
     Map<String, DateTime> folderDates = {};
     Map<String, int> folderScores = {};
-    Map<String, bool> folderTypes = {}; // ✅
+    Map<String, bool> folderTypes = {};
 
     for (var folder in folders) {
       String folderName = folder.path.split('/').last;
-      DateTime folderDate = folder.statSync().modified;
+      DateTime fallbackDate = folder.statSync().changed; // fallback
 
-      // ✅ Read isTournament flag
+      // Read metadata
-      bool isTournament = false;
       final metadataFile = File('${folder.path}/metadata.json');
+      bool isTournament = false;
+      DateTime? createdAt;
+
       if (await metadataFile.exists()) {
         try {
           final metadata = jsonDecode(await metadataFile.readAsString());
+
           isTournament = metadata['isTournament'] == true;
+
+          if (metadata['createdAt'] != null) {
+            createdAt = DateTime.tryParse(metadata['createdAt']);
+          }
         } catch (e) {
           debugPrint("Error reading metadata for $folderName: $e");
         }
       }
+
+      // Use createdAt if available, fallback otherwise
+      folderDates[folderName] = createdAt ?? fallbackDate;
       folderTypes[folderName] = isTournament;
 
+      // List target files
       List<File> targetFiles = Directory(folder.path)
           .listSync()
           .whereType<File>()
@@ -131,36 +142,30 @@ Color _getColorFromName(String colorName) {
       for (var file in targetFiles) {
         final jsonString = await file.readAsString();
         final data = jsonDecode(jsonString);
-        final score = _getScoreFromJson(data);
+        totalScore += _getScoreFromJson(data);
-        totalScore += score;
       }
 
       groupedFiles[folderName] = targetFiles;
-      folderDates[folderName] = folderDate;
       folderScores[folderName] = totalScore;
     }
 
+    // Sort folders by stored or fallback created date (DESC)
     final sortedFolderNames = folderDates.keys.toList()
       ..sort((a, b) => folderDates[b]!.compareTo(folderDates[a]!));
 
-    final sortedGroupedFiles = {
-      for (var folderName in sortedFolderNames) folderName: groupedFiles[folderName]!
-    };
-    final sortedFolderScores = {
-      for (var folderName in sortedFolderNames) folderName: folderScores[folderName]!
-    };
-    final sortedFolderDates = {
-      for (var folderName in sortedFolderNames) folderName: folderDates[folderName]!
-    };
-    final sortedFolderTypes = {
-      for (var folderName in sortedFolderNames) folderName: folderTypes[folderName]!
-    };
-
     setState(() {
-      _groupedFiles = sortedGroupedFiles;
+      _groupedFiles = {
-      _folderCreationDates = sortedFolderDates;
+        for (var name in sortedFolderNames) name: groupedFiles[name]!
-      _folderScores = sortedFolderScores;
+      };
-      _folderTypes = sortedFolderTypes; // ✅ FIXED
+      _folderCreationDates = {
+        for (var name in sortedFolderNames) name: folderDates[name]!
+      };
+      _folderScores = {
+        for (var name in sortedFolderNames) name: folderScores[name]!
+      };
+      _folderTypes = {
+        for (var name in sortedFolderNames) name: folderTypes[name]!
+      };
     });
   } catch (e) {
     debugPrint("Error loading target data files: $e");
@@ -168,6 +173,7 @@ Color _getColorFromName(String colorName) {
 }
 
 
+
   // Function to safely get the score from the JSON data
   int _getScoreFromJson(Map<String, dynamic> data) {
     if (data.containsKey('totalScore') && data['totalScore'] is int) {
@@ -250,22 +256,30 @@ Color _getColorFromName(String colorName) {
         ),
       ),
     );
+  }
+
+  List<String> _filteredFolderNames() {
+  final List<String> folders = _groupedFiles.keys.toList();
+
+  if (_folderFilter != 'all') {
+    final isTournament = _folderFilter == 'tournament';
+    folders.retainWhere((folderName) => _folderTypes[folderName] == isTournament);
+  }
+
+  // 🔽 Sort using `createdAt` from _folderCreationDates (which is now based on metadata.json)
+  folders.sort((a, b) {
+    final dateA = _folderCreationDates[a];
+    final dateB = _folderCreationDates[b];
+    if (dateA == null || dateB == null) return 0;
+    return dateB.compareTo(dateA); // Newest first
+  });
+
+  return folders;
 }
 
-List<String> _filteredFolderNames() {
-  if (_folderFilter == 'all') return _groupedFiles.keys.toList();
 
-  final isTournamentFilter = _folderFilter == 'tournament';
+Future<void> _renameFolder(String oldFolderName) async {
-
-  return _groupedFiles.keys
-      .where((folderName) => _folderTypes[folderName] == isTournamentFilter)
-      .toList();
-}
-
-  // Rename folder
-  Future<void> _renameFolder(String oldFolderName) async {
   final newNameController = TextEditingController();
- 
   bool isTournament = _folderTypes[oldFolderName] == true;
 
   final result = await showDialog<Map<String, dynamic>>(
@@ -291,7 +305,6 @@ List<String> _filteredFolderNames() {
                     ),
                   ),
                   const SizedBox(height: 20),
-
                   TextField(
                     controller: newNameController,
                     textAlign: TextAlign.center,
@@ -301,8 +314,7 @@ List<String> _filteredFolderNames() {
                       fillColor: Colors.grey[800],
                       hintText: 'Enter new folder name',
                       hintStyle: const TextStyle(color: Colors.white54),
-                      contentPadding:
+                      contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
-                          const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
                       enabledBorder: OutlineInputBorder(
                         borderRadius: BorderRadius.circular(12),
                         borderSide: BorderSide.none,
@@ -319,7 +331,6 @@ List<String> _filteredFolderNames() {
                     },
                   ),
                   const SizedBox(height: 16),
-
                   GestureDetector(
                     onTap: () {
                       setState(() {
@@ -329,28 +340,19 @@ List<String> _filteredFolderNames() {
                     child: Container(
                       width: double.infinity,
                       decoration: BoxDecoration(
-                        color: isTournament
+                        color: isTournament ? _bulletColor.withOpacity(0.2) : Colors.grey[850],
-                            ? _bulletColor.withOpacity(0.2)
-                            : Colors.grey[850],
                         borderRadius: BorderRadius.circular(12),
                         border: Border.all(
-                          color: isTournament
+                          color: isTournament ? _bulletColor : Colors.grey[700]!,
-                              ? _bulletColor
-                              : Colors.grey[700]!,
                           width: 1.5,
                         ),
                       ),
-                      padding: const EdgeInsets.symmetric(
+                      padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
-                          horizontal: 16, vertical: 14),
                       child: Center(
                         child: Text(
-                          isTournament
+                          isTournament ? 'Tournament Mode 🏆' : 'Mark as Tournament 🏆',
-                              ? 'Tournament Mode 🏆'
-                              : 'Mark as Tournament 🏆',
                           style: TextStyle(
-                            color: isTournament
+                            color: isTournament ? _bulletColor : Colors.white70,
-                                ? _bulletColor
-                                : Colors.white70,
                             fontWeight: FontWeight.w500,
                             fontSize: 16,
                           ),
@@ -359,7 +361,6 @@ List<String> _filteredFolderNames() {
                     ),
                   ),
                   const SizedBox(height: 20),
-
                   Row(
                     children: [
                       Expanded(
@@ -368,8 +369,7 @@ List<String> _filteredFolderNames() {
                           style: ElevatedButton.styleFrom(
                             backgroundColor: Colors.grey[800],
                             foregroundColor: Colors.white,
-                            padding:
+                            padding: const EdgeInsets.symmetric(vertical: 12),
-                                const EdgeInsets.symmetric(vertical: 12),
                             shape: RoundedRectangleBorder(
                               borderRadius: BorderRadius.circular(12),
                             ),
@@ -387,8 +387,7 @@ List<String> _filteredFolderNames() {
                           style: ElevatedButton.styleFrom(
                             backgroundColor: _bulletColor,
                             foregroundColor: Colors.white,
-                            padding:
+                            padding: const EdgeInsets.symmetric(vertical: 12),
-                                const EdgeInsets.symmetric(vertical: 12),
                             shape: RoundedRectangleBorder(
                               borderRadius: BorderRadius.circular(12),
                             ),
@@ -407,26 +406,20 @@ List<String> _filteredFolderNames() {
     },
   );
 
-  // ✅ Handle result (rename + update tag)
+  // ✅ Handle result (rename + tag update)
   if (result != null) {
     final newName = result['name'];
     final isTournament = result['isTournament'] ?? false;
 
     final directory = await getApplicationDocumentsDirectory();
-    final oldFolderPath =
+    final oldFolderPath = Directory('${directory.path}/saved_images/$oldFolderName');
-        Directory('${directory.path}/saved_images/$oldFolderName');
+    final targetFolderName = (newName != null && newName.isNotEmpty) ? newName : oldFolderName;
-
+    final newFolderPath = Directory('${directory.path}/saved_images/$targetFolderName');
-    final targetFolderName =
-        (newName != null && newName.isNotEmpty) ? newName : oldFolderName;
-
-    final newFolderPath =
-        Directory('${directory.path}/saved_images/$targetFolderName');
 
     if (targetFolderName != oldFolderName) {
       if (await newFolderPath.exists()) {
         ScaffoldMessenger.of(context).showSnackBar(
-          SnackBar(
+          SnackBar(content: Text('A folder named "$targetFolderName" already exists.')),
-              content: Text('A folder named "$targetFolderName" already exists.')),
         );
         return;
       } else {
@@ -434,20 +427,33 @@ List<String> _filteredFolderNames() {
       }
     }
 
+    // ✅ Preserve existing createdAt value or set it if missing
     final metadataFile = File('${newFolderPath.path}/metadata.json');
-    if (isTournament) {
+    String? createdAt;
-      await metadataFile.writeAsString(jsonEncode({'isTournament': true}));
+
-    } else {
     if (await metadataFile.exists()) {
-        await metadataFile.delete();
+      try {
-      }
+        final existing = jsonDecode(await metadataFile.readAsString());
+        createdAt = existing['createdAt'];
+      } catch (_) {}
     }
 
-    _loadTargetDataFiles(); // refresh UI
+    createdAt ??= DateTime.now().toIso8601String(); // fallback if not found
+
+    final updatedMetadata = {
+      'isTournament': isTournament,
+      'createdAt': createdAt,
+    };
+
+    await metadataFile.writeAsString(jsonEncode(updatedMetadata));
+
+    _loadTargetDataFiles(); // Refresh UI
   }
 }
 
 
+
+
   // Delete a folder
   Future<void> _deleteFolder(String folderName) async {
   bool? confirmDeletion = await _showConfirmationDialog(