Implement buying energy

src/main/java/emu/nebula/GameConstants.java

@@ -9,8 +9,9 @@ public class GameConstants {
     public static final int INTRO_GUIDE_ID = 1;
 
     public static final int GOLD_ITEM_ID = 1;
+    public static final int ENERGY_BUY_ITEM_ID = 2;
     public static final int EXP_ITEM_ID = 21;
-
+    
     public static final int MAX_ENERGY = 240;
     public static final int ENERGY_REGEN_TIME = 360; // Seconds
     

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

@@ -2,6 +2,7 @@ package emu.nebula.game.inventory;
 
 import java.util.List;
 
+import emu.nebula.GameConstants;
 import emu.nebula.Nebula;
 import emu.nebula.data.GameData;
 import emu.nebula.game.player.PlayerManager;
@@ -337,6 +338,25 @@ public class Inventory extends PlayerManager {
         return change.setSuccess(true);
     }
     
+    public PlayerChangeInfo buyEnergy() {
+        // Create change info
+        var change = new PlayerChangeInfo();
+        
+        // Make sure we have the gems
+        if (!this.verifyItem(GameConstants.ENERGY_BUY_ITEM_ID, 30)) {
+            return change;
+        }
+        
+        // Remove gems
+        this.removeItem(GameConstants.ENERGY_BUY_ITEM_ID, 30, change);
+        
+        // Add energy
+        this.getPlayer().addEnergy(60, change);
+        
+        // Success
+        return change;
+    }
+    
     public PlayerChangeInfo useItem(int id, int count, PlayerChangeInfo change) {
         // Changes
         if (change == null) {

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

@@ -0,0 +1,30 @@
+package emu.nebula.server.handlers;
+
+import emu.nebula.net.NetHandler;
+import emu.nebula.net.NetMsgId;
+import emu.nebula.proto.EnergyBuy.EnergyBuyResp;
+import emu.nebula.net.HandlerId;
+import emu.nebula.net.GameSession;
+
+@HandlerId(NetMsgId.energy_buy_req)
+public class HandlerEnergyBuyReq extends NetHandler {
+
+    @Override
+    public byte[] handle(GameSession session, byte[] message) throws Exception {
+        // Buy energy
+        var change = session.getPlayer().getInventory().buyEnergy();
+        
+        if (change == null) {
+            return session.encodeMsg(NetMsgId.energy_buy_failed_ack);
+        }
+        
+        // Build response
+        var rsp = EnergyBuyResp.newInstance()
+                .setChange(change.toProto())
+                .setCount(0); // TODO max energy buy count per day
+        
+        // Encode and send
+        return session.encodeMsg(NetMsgId.energy_buy_succeed_ack, rsp);
+    }
+
+}