From abb6b51deac34ffb7f5bbeadbb35723ba4c2f97c Mon Sep 17 00:00:00 2001
From: Kei-Luna <touhousetsuna@gmail.com>
Date: Sun, 26 Apr 2026 14:33:41 +0900
Subject: [PATCH] The character displayed on the lobby screen can now be
 changed.

PlayerSetting_ChangeShowCard
---
 Common/Database/Player/PlayerGameData.cs      |  1 +
 GameServer/Game/Player/PlayerInstance.cs      | 13 ++++++
 .../Misc/PlayerSetting_ChangeShowCard.cs      | 41 +++++++++++++++++++
 3 files changed, 55 insertions(+)
 create mode 100644 GameServer/Server/CallGS/Handlers/Misc/PlayerSetting_ChangeShowCard.cs

diff --git a/Common/Database/Player/PlayerGameData.cs b/Common/Database/Player/PlayerGameData.cs
index 8ee097d..2566f9d 100644
--- a/Common/Database/Player/PlayerGameData.cs
+++ b/Common/Database/Player/PlayerGameData.cs
@@ -15,6 +15,7 @@ public class PlayerGameData : BaseDatabaseDataHelper
     public long LastActiveTime { get; set; }
     public Sex Gender { get; set; } = Sex.Female;
     [SugarColumn(IsJson = true)] public List<PlayerAttr> Attrs { get; set; } = [];
+    [SugarColumn(IsJson = true)] public List<ulong> ShowItems { get; set; } = [];
 
     public static PlayerGameData? GetPlayerByUid(long uid)
     {
diff --git a/GameServer/Game/Player/PlayerInstance.cs b/GameServer/Game/Player/PlayerInstance.cs
index d63c58b..893fbd0 100644
--- a/GameServer/Game/Player/PlayerInstance.cs
+++ b/GameServer/Game/Player/PlayerInstance.cs
@@ -188,9 +188,22 @@ public class PlayerInstance(PlayerGameData data)
             proto.Attrs[ToShiftedAttrKey(gid, sid)] = val;
         }
 
+        proto.ShowItems.AddRange(Data.ShowItems);
+
         return proto;
     }
 
+    public void SetShowItem(int index, ulong itemId)
+    {
+        if (index <= 0)
+            return;
+
+        while (Data.ShowItems.Count < index)
+            Data.ShowItems.Add(0);
+
+        Data.ShowItems[index - 1] = itemId;
+    }
+
     private static uint ToPackedAttrKey(uint gid, uint sid)
     {
         if (gid == 0)
diff --git a/GameServer/Server/CallGS/Handlers/Misc/PlayerSetting_ChangeShowCard.cs b/GameServer/Server/CallGS/Handlers/Misc/PlayerSetting_ChangeShowCard.cs
new file mode 100644
index 0000000..1c2957f
--- /dev/null
+++ b/GameServer/Server/CallGS/Handlers/Misc/PlayerSetting_ChangeShowCard.cs
@@ -0,0 +1,41 @@
+using MikuSB.Database;
+using MikuSB.Proto;
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace MikuSB.GameServer.Server.CallGS.Handlers.Misc;
+
+[CallGSApi("PlayerSetting_ChangeShowCard")]
+public class PlayerSetting_ChangeShowCard : ICallGSHandler
+{
+    private const int ShowItemGirlIndex = 4;
+
+    public async Task Handle(Connection connection, string param, ushort seqNo)
+    {
+        var player = connection.Player!;
+        var req = JsonSerializer.Deserialize<ChangeShowCardParam>(param);
+        if (req == null)
+            return;
+
+        var card = player.CharacterManager.GetCharacterByGUID(req.Id);
+        if (card == null)
+        {
+            await CallGSRouter.SendScript(connection, "PlayerSetting_ChangeShowCard", "{}");
+            return;
+        }
+
+        player.SetShowItem(ShowItemGirlIndex, card.Guid);
+        DatabaseHelper.SaveDatabaseType(player.Data);
+
+        var sync = new NtfSyncPlayer();
+        sync.ShowItems.AddRange(player.Data.ShowItems);
+
+        await CallGSRouter.SendScript(connection, "PlayerSetting_ChangeShowCard", "{}", sync);
+    }
+}
+
+internal sealed class ChangeShowCardParam
+{
+    [JsonPropertyName("nID")]
+    public uint Id { get; set; }
+}