Add shareware support and spawn correctly for difficulty levels

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

lib/features/map/wolf_map_parser.dart

@@ -2,11 +2,16 @@ import 'dart:convert';
 import 'dart:typed_data';
 
 import 'package:wolf_dart/classes/matrix.dart';
+import 'package:wolf_dart/features/entities/map_objects.dart';
 import 'package:wolf_dart/features/map/wolf_level.dart';
 
 abstract class WolfMapParser {
   /// Parses MAPHEAD and GAMEMAPS to extract the raw level data.
-  static List<WolfLevel> parseMaps(ByteData mapHead, ByteData gameMaps) {
+  static List<WolfLevel> parseMaps(
+    ByteData mapHead,
+    ByteData gameMaps, {
+    bool isShareware = false,
+  }) {
     List<WolfLevel> levels = [];
 
     // 1. READ MAPHEAD
@@ -66,6 +71,21 @@ abstract class WolfMapParser {
       Uint16List carmackExpandedObjects = _expandCarmack(compressedObjectData);
       List<int> flatObjectGrid = _expandRlew(carmackExpandedObjects, rlewTag);
 
+      for (int i = 0; i < flatObjectGrid.length; i++) {
+        int id = flatObjectGrid[i];
+
+        // Handle the 'secret' pushwalls (Logic check)
+        if (id == MapObject.pushwallTrigger) {
+          // In Wolf3D, ID 98 means the wall at this same index in Plane 0 is pushable.
+          // You might want to mark this in your engine state.
+        }
+
+        // Filter out invalid IDs for Shareware to prevent crashes
+        if (isShareware && !MapObject.isSharewareCompatible(id)) {
+          flatObjectGrid[i] = 0; // Turn unknown objects into empty space
+        }
+      }
+
       Matrix<int> wallGrid = [];
       Matrix<int> objectGrid = []; // NEW