Fix gift boxes not giving gifts when being bought from the shop

src/main/java/emu/nebula/data/resources/DropPkgDef.java

@@ -0,0 +1,40 @@
+package emu.nebula.data.resources;
+
+import emu.nebula.data.BaseDef;
+import emu.nebula.data.ResourceType;
+import emu.nebula.util.Utils;
+import it.unimi.dsi.fastutil.ints.Int2ObjectMap;
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+import it.unimi.dsi.fastutil.ints.IntArrayList;
+import it.unimi.dsi.fastutil.ints.IntList;
+import lombok.Getter;
+
+@Getter
+@ResourceType(name = "DropPkg.json")
+public class DropPkgDef extends BaseDef {
+    private int PkgId;
+    private int ItemId;
+    
+    private static Int2ObjectMap<IntList> PACKAGES = new Int2ObjectOpenHashMap<>();
+    
+    @Override
+    public int getId() {
+        return PkgId;
+    }
+    
+    @Override
+    public void onLoad() {
+        var packageList = PACKAGES.computeIfAbsent(this.PkgId, i -> new IntArrayList());
+        packageList.add(this.ItemId);
+    }
+    
+    public static int getRandomDrop(int packageId) {
+        var packageList = PACKAGES.get(packageId);
+        
+        if (packageList == null) {
+            return 0;
+        }
+        
+        return Utils.randomElement(packageList);
+    }
+}

src/main/java/emu/nebula/game/inventory/Inventory.java

@@ -7,6 +7,7 @@ import dev.morphia.annotations.Id;
 import emu.nebula.GameConstants;
 import emu.nebula.Nebula;
 import emu.nebula.data.GameData;
+import emu.nebula.data.resources.DropPkgDef;
 import emu.nebula.data.resources.MallShopDef;
 import emu.nebula.data.resources.ResidentGoodsDef;
 import emu.nebula.database.GameDatabaseObject;
@@ -284,8 +285,8 @@ public class Inventory extends PlayerManager implements GameDatabaseObject {
             change = new PlayerChangeInfo();
         }
         
-        // Sanity
+        // Sanity check
-        if (count == 0) {
+        if (id <= 0 || count == 0) {
             return change;
         }
         
@@ -339,11 +340,32 @@ public class Inventory extends PlayerManager implements GameDatabaseObject {
                 }
             }
             case Item -> {
+                // Check if item is a random package
+                if (data.getItemSubType() == ItemSubType.RandomPackage && data.getUseParams() != null) {
+                    // Cannot remove packages
+                    if (count <= 0) break;
+                    
+                    // Add random packages
+                    for (var entry : data.getUseParams()) {
+                        int pkgId = entry.getIntKey();
+                        int pkgCount = entry.getIntValue() * count;
+                        
+                        for (int i = 0; i < pkgCount; i++) {
+                            int pkgDropId = DropPkgDef.getRandomDrop(pkgId);
+                            this.addItem(pkgDropId, 1, change);
+                        }
+                    }
+                    
+                    // End early
+                    break;
+                }
+                
+                // Get item
                 var item = this.items.get(id);
                 int diff = 0;
                 
                 if (amount > 0) {
-                    // Add resource
+                    // Add item
                     if (item == null) {
                         item = new GameItem(this.getPlayer(), id, amount);
                         this.items.put(item.getItemId(), item);