prevent diamond block as building block in SpaceSnake

src/main/java/eu/mhsl/minenet/minigames/util/MaterialUtil.java

@@ -1,9 +1,28 @@
 package eu.mhsl.minenet.minigames.util;
 
+import net.minestom.server.instance.block.BlockFace;
 import net.minestom.server.item.Material;
 
+import java.util.Arrays;
+import java.util.List;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.function.Predicate;
+
 public class MaterialUtil {
     public static Material fromString(String name, Material def) {
         return Material.values().stream().filter(material -> material.name().equals(name)).findFirst().orElse(def);
     }
+
+    public static Material getRandomFullBlock(Predicate<Material> filter) {
+        List<Material> blocks = Material.values().stream()
+            .filter(filter)
+            .filter(Material::isBlock)
+            .filter(material -> material.block().isSolid())
+            .filter(material -> Arrays.stream(BlockFace.values())
+                .allMatch(face -> material.block().registry().collisionShape().isFaceFull(face))
+            )
+            .toList();
+
+        return blocks.get(ThreadLocalRandom.current().nextInt(blocks.size()));
+    }
 }