Add custom handling for breaking empty shulker boxes

src/main/java/org/blocovermelho/bvextension/utils/Inventory.java

@@ -1,19 +1,30 @@
 package org.blocovermelho.bvextension.utils;
 
+import carpet.CarpetSettings;
 import net.minecraft.block.BlockState;
+import net.minecraft.block.ShulkerBoxBlock;
 import net.minecraft.block.entity.BlockEntity;
 import net.minecraft.block.entity.ShulkerBoxBlockEntity;
-import net.minecraft.entity.Entity;
 import net.minecraft.entity.player.PlayerEntity;
+import net.minecraft.item.Item;
 import net.minecraft.item.ItemStack;
+import net.minecraft.nbt.NbtCompound;
 import net.minecraft.server.world.ServerWorld;
 import net.minecraft.sound.SoundCategory;
 import net.minecraft.sound.SoundEvents;
 import net.minecraft.stat.Stats;
+import net.minecraft.text.LiteralTextContent;
+import net.minecraft.text.Text;
+import net.minecraft.text.TranslatableTextContent;
 import net.minecraft.util.math.BlockPos;
 import net.minecraft.world.World;
 
 
+import java.util.ArrayList;
+import java.util.List;
+
+import static carpet.helpers.InventoryHelper.TAG_COMPOUND;
+import static carpet.helpers.InventoryHelper.TAG_LIST;
 import static net.minecraft.block.Block.dropStack;
 import static net.minecraft.block.Block.getDroppedStacks;
 
@@ -26,7 +37,15 @@ public static void putItem(BlockState state, World world, BlockPos pos, BlockEnt
                 var count = is.getCount();
 
                 if (blockEntity instanceof ShulkerBoxBlockEntity sbbe) {
-                    is.removeSubNbt("BlockEntityTag");
+                    if (sbbe.isEmpty()) { is.removeSubNbt("BlockEntityTag"); }
+                    int candidate = SBox.getCandidate(sbbe, entity.getInventory());
+                    if (candidate != -1) {
+                        ItemStack slot = entity.getInventory().getStack(candidate);
+                        slot.increment(1);
+                        entity.getInventory().setStack(candidate,slot);
+                        entity.increaseStat(Stats.PICKED_UP.getOrCreateStat(item), count);
+                        return;
+                    }
                 }
 
                 if (entity.getInventory().insertStack(is)) {
@@ -38,4 +57,43 @@ public static void putItem(BlockState state, World world, BlockPos pos, BlockEnt
             });
         }
     }
+
+    public class SBox {
+        public static boolean HasItem(ItemStack sboxItem) {
+            NbtCompound tag = sboxItem.getNbt();
+
+            if (tag == null || !tag.contains("BlockEntityTag", TAG_COMPOUND))
+                return false;
+
+            NbtCompound bet = tag.getCompound("BlockEntityTag");
+            return bet.contains("Items", TAG_LIST) && !bet.getList("Items", TAG_COMPOUND).isEmpty();
+        }
+        public static int getCandidate(ShulkerBoxBlockEntity box, net.minecraft.inventory.Inventory inventory) {
+            if (CarpetSettings.stackableShulkerBoxes.equals("false")
+                    || CarpetSettings.shulkerBoxStackSize == 1
+                    || !box.isEmpty()
+            ) {
+                return -1;
+            }
+
+            Item boxKind = ShulkerBoxBlock.getItemStack(box.getColor()).getItem();
+            for (int i = 0; i < inventory.size(); i++) {
+                ItemStack stack = inventory.getStack(i);
+                if (stack.isEmpty()) continue;
+                if (!stack.isOf(boxKind)) continue;
+                if (SBox.HasItem(stack)) continue;
+
+                Text stackName = stack.getName();
+                Text boxName = box.getName();
+
+                if (!box.hasCustomName() && stackName.getContent() instanceof LiteralTextContent) continue;
+                if (box.hasCustomName() && !stackName.equals(boxName)) continue;
+                if (stack.getCount() + 1 > CarpetSettings.shulkerBoxStackSize) continue;
+
+                return i;
+            }
+            return -1;
+        }
+    }
+
 }