Implement buying from mall shop

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

@@ -4,6 +4,7 @@ import com.google.gson.annotations.SerializedName;
 
 import emu.nebula.data.BaseDef;
 import emu.nebula.data.ResourceType;
+import emu.nebula.game.inventory.ItemParamMap;
 import lombok.Getter;
 
 @Getter
@@ -15,9 +16,17 @@ public class MallPackageDef extends BaseDef {
     private int CurrencyType;
     private int CurrencyItemId;
     private int CurrencyItemQty;
+    private String Items;
+    
+    private transient ItemParamMap products;
     
     @Override
     public int getId() {
         return IdString.hashCode();
     }
+    
+    @Override
+    public void onLoad() {
+        this.products = ItemParamMap.fromJsonString(this.Items);
+    }
 }

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

@@ -558,8 +558,35 @@ public class Inventory extends PlayerManager implements GameDatabaseObject {
         return change;
     }
     
+    public PlayerChangeInfo buyItem(int currencyId, int currencyCount, ItemParamMap buyItems, int buyCount) {
+        return this.buyItem(currencyId, currencyCount, buyItems, buyCount, null);
+    }
+    
+    public PlayerChangeInfo buyItem(int currencyId, int currencyCount, ItemParamMap buyItems, int buyCount, PlayerChangeInfo change) {
+        // Player change info
+        if (change == null) {
+            change = new PlayerChangeInfo();
+        }
+        
+        // Make sure we have the currency
+        int cost = buyCount * currencyCount;
+        
+        if (!this.verifyItem(currencyId, cost)) {
+            return change;
+        }
+        
+        // Remove currency item
+        this.removeItem(currencyId, cost, change);
+        
+        // Add items
+        this.addItems(buyItems.mulitply(buyCount), change);
+        
+        // Success
+        return change.setSuccess(true);
+    }
+    
     public PlayerChangeInfo useItem(int id, int count, PlayerChangeInfo change) {
-        // Changes
+        // Player change info
         if (change == null) {
             change = new PlayerChangeInfo();
         }
@@ -597,7 +624,7 @@ public class Inventory extends PlayerManager implements GameDatabaseObject {
         }
         
         // Success
-        return change;
+        return change.setSuccess(true);
     }
     
     // Database

src/main/java/emu/nebula/server/handlers/HandlerMallShopOrderReq.java

@@ -0,0 +1,40 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.MallShopOrder.MallShopOrderReq;
+import emu.nebula.net.HandlerId;
+import emu.nebula.data.GameData;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.mall_shop_order_req )
+public class HandlerMallShopOrderReq extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Parse request
+        var req = MallShopOrderReq.parseFrom(message);
+        
+        // Get package data
+        var data = GameData.getMallPackageDataTable().get(req.getId().hashCode());
+        if (data == null) {
+            return session.encodeMsg(NetMsgId.mall_shop_order_failed_ack);
+        }
+        
+        // Buy items
+        var change = session.getPlayer().getInventory().buyItem(
+                data.getCurrencyItemId(),
+                data.getCurrencyItemQty(),
+                data.getProducts(),
+                req.getQty()
+        );
+        
+        if (change == null) {
+            return session.encodeMsg(NetMsgId.mall_shop_order_failed_ack);
+        }
+        
+        // Encode and send
+        return session.encodeMsg(NetMsgId.mall_shop_order_succeed_ack, change.toProto());
+    }
+
+}