Implement story

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

@@ -1,5 +1,7 @@
 package emu.nebula.game.inventory;
 
+import com.google.gson.annotations.SerializedName;
+
 import dev.morphia.annotations.Entity;
 import emu.nebula.proto.Public.ItemTpl;
 import lombok.Getter;
@@ -7,7 +9,10 @@ import lombok.Getter;
 @Getter
 @Entity(useDiscriminator = false)
 public class ItemParam {
+    @SerializedName("Tid")
     public int id;
+    
+    @SerializedName("Qty")
     public int count;
     
     @Deprecated // Morphia only

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

@@ -76,7 +76,7 @@ public class ItemParamMap extends Int2IntOpenHashMap {
                 .map(e -> ItemTpl.newInstance().setTid(e.getIntKey()).setQty(e.getIntValue()));
     }
     
-    // Proto
+    // Helpers
 
     public static ItemParamMap fromTemplates(RepeatedMessage<ItemTpl> items) {
         var map = new ItemParamMap();
@@ -97,4 +97,14 @@ public class ItemParamMap extends Int2IntOpenHashMap {
         
         return map;
     }
+
+    public static ItemParamMap fromItemParams(List<ItemParam> items) {
+        var map = new ItemParamMap();
+        
+        for (var template : items) {
+            map.add(template.getId(), template.getCount());
+        }
+        
+        return map;
+    }
 }