Move initialization and access to a singleton

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/game_select_screen.dart

@@ -1,9 +1,7 @@
-import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
-import 'package:wolf_3d_data/wolf_3d_data.dart';
 import 'package:wolf_3d_data_types/wolf_3d_data_types.dart';
 import 'package:wolf_dart/features/difficulty/difficulty_screen.dart';
+import 'package:wolf_dart/wolf_3d.dart';
 
 class GameSelectScreen extends StatelessWidget {
   const GameSelectScreen({super.key});
@@ -11,115 +9,27 @@ class GameSelectScreen extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      body: FutureBuilder(
-        future: loadData(),
-        builder: (context, snapshot) {
-          if (snapshot.connectionState == ConnectionState.waiting) {
-            return CircularProgressIndicator();
-          }
+      body: ListView.builder(
+        itemCount: Wolf3d.I.availableGames.length,
+        itemBuilder: (context, i) {
+          final WolfensteinData data = Wolf3d.I.availableGames[i];
+          final GameVersion version = data.version;
 
-          if (!snapshot.hasData) {
-            return Text("Unable to load data");
-          }
-
-          final List<WolfensteinData> loadedGames = snapshot.data!;
-
-          if (loadedGames.length == 1) {
-            WidgetsBinding.instance.addPostFrameCallback((_) {
-              Navigator.of(context).push(
-                MaterialPageRoute(
-                  builder: (context) => DifficultyScreen(loadedGames.first),
-                ),
-              );
-            });
-          }
-
-          return ListView.builder(
-            itemCount: loadedGames.length,
-            itemBuilder: (context, i) {
-              final WolfensteinData data = loadedGames[i];
-              final GameVersion version = data.version;
-
-              return Card(
-                child: ListTile(
-                  title: Text(version.name),
-                  onTap: () {
-                    Navigator.of(context).push(
-                      MaterialPageRoute(
-                        builder: (context) => DifficultyScreen(data),
-                      ),
-                    );
-                  },
-                ),
-              );
-            },
+          return Card(
+            child: ListTile(
+              title: Text(version.name),
+              onTap: () {
+                Wolf3d.I.setActiveGame(data);
+                Navigator.of(context).push(
+                  MaterialPageRoute(
+                    builder: (context) => DifficultyScreen(),
+                  ),
+                );
+              },
+            ),
           );
         },
       ),
     );
   }
-
-  Future<ByteData?> tryLoad(String path) async {
-    try {
-      return await rootBundle.load(path);
-    } catch (e) {
-      debugPrint("Asset not found: $path");
-      return null;
-    }
-  }
-
-  Future<List<WolfensteinData>> loadData({String? directory}) async {
-    final List<WolfensteinData> loadedGames = [];
-
-    // 1. Always attempt to load bundled assets first (works on ALL platforms)
-    final versionsToTry = [
-      (version: GameVersion.retail, path: 'retail'),
-      (version: GameVersion.shareware, path: 'shareware'),
-    ];
-
-    for (final version in versionsToTry) {
-      try {
-        final ext = version.version.fileExtension;
-        final folder = 'assets/${version.path}';
-
-        final data = WolfensteinLoader.loadFromBytes(
-          version: version.version,
-          vswap: await tryLoad('$folder/VSWAP.$ext'),
-          mapHead: await tryLoad('$folder/MAPHEAD.$ext'),
-          gameMaps: await tryLoad('$folder/GAMEMAPS.$ext'),
-          vgaDict: await tryLoad('$folder/VGADICT.$ext'),
-          vgaHead: await tryLoad('$folder/VGAHEAD.$ext'),
-          vgaGraph: await tryLoad('$folder/VGAGRAPH.$ext'),
-          audioHed: await tryLoad('$folder/AUDIOHED.$ext'),
-          audioT: await tryLoad('$folder/AUDIOT.$ext'),
-        );
-
-        loadedGames.add(data);
-      } catch (e) {
-        // The loader now provides the specific error:
-        // "ArgumentError: Cannot load retail: Missing files: VSWAP.WL6, ..."
-        debugPrint(e.toString());
-      }
-    }
-
-    // 2. On non-web, also check for external files in a specific "games" folder
-    // if you want to support side-loading.
-    if (!kIsWeb) {
-      try {
-        final externalGames = await WolfensteinLoader.discover(
-          directoryPath: directory,
-          recursive: true,
-        );
-        for (var entry in externalGames.entries) {
-          if (!loadedGames.any((g) => g.version == entry.key)) {
-            loadedGames.add(entry.value);
-          }
-        }
-      } catch (e) {
-        debugPrint("External discovery failed: $e");
-      }
-    }
-
-    return loadedGames;
-  }
 }