feat: add ability to buy resin with primogems (#2104)

* feat: add ability to buy resin with primogems

* ResinManager#buy returns RetCode value

src/main/java/emu/grasscutter/game/managers/ResinManager.java

@@ -1,16 +1,22 @@
 package emu.grasscutter.game.managers;
 
-import static emu.grasscutter.config.Configuration.GAME_OPTIONS;
-
+import emu.grasscutter.game.inventory.GameItem;
 import emu.grasscutter.game.player.BasePlayerManager;
 import emu.grasscutter.game.player.Player;
+import emu.grasscutter.game.props.ActionReason;
 import emu.grasscutter.game.props.PlayerProperty;
 import emu.grasscutter.game.props.WatcherTriggerType;
-import emu.grasscutter.server.packet.send.PacketPlayerPropNotify;
+import emu.grasscutter.net.proto.RetcodeOuterClass;
+import emu.grasscutter.server.packet.send.PacketItemAddHintNotify;
 import emu.grasscutter.server.packet.send.PacketResinChangeNotify;
 import emu.grasscutter.utils.Utils;
 
+import static emu.grasscutter.config.Configuration.GAME_OPTIONS;
+
 public class ResinManager extends BasePlayerManager {
+    public static final int MAX_RESIN_BUYING_COUNT = 6;
+    public static final int AMOUNT_TO_ADD = 60;
+    public static final int[] HCOIN_NUM_TO_BUY_RESIN = new int[]{50, 100, 100, 150, 200, 200};
 
     public ResinManager(Player player) {
         super(player);
@@ -146,4 +152,22 @@ public synchronized void onPlayerLogin() {
         // Send initial notifications on logon.
         this.player.sendPacket(new PacketResinChangeNotify(this.player));
     }
+
+    public int buy() {
+        if (this.player.getResinBuyCount() >= MAX_RESIN_BUYING_COUNT) {
+            return RetcodeOuterClass.Retcode.RET_RESIN_BOUGHT_COUNT_EXCEEDED_VALUE;
+        }
+
+        var res = this.player.getInventory().payItem(201, HCOIN_NUM_TO_BUY_RESIN[this.player.getResinBuyCount()]);
+        if (!res) {
+            return RetcodeOuterClass.Retcode.RET_HCOIN_NOT_ENOUGH_VALUE;
+        }
+
+        this.player.setResinBuyCount(this.player.getResinBuyCount() + 1);
+        this.player.setProperty(PlayerProperty.PROP_PLAYER_WAIT_SUB_HCOIN, 0);
+        this.addResin(AMOUNT_TO_ADD);
+        this.player.sendPacket(new PacketItemAddHintNotify(new GameItem(106, AMOUNT_TO_ADD), ActionReason.BuyResin));
+
+        return 0;
+    }
 }