baseline: OpenMU upstream b5a0961 (fresh source)

src/GameServer/RemoteView/Inventory/NpcItemBoughtPlugIn.cs

@@ -0,0 +1,57 @@
+// <copyright file="NpcItemBoughtPlugIn.cs" company="MUnique">
+// Licensed under the MIT License. See LICENSE file in the project root for full license information.
+// </copyright>
+
+namespace MUnique.OpenMU.GameServer.RemoteView.Inventory;
+
+using System.Runtime.InteropServices;
+using MUnique.OpenMU.DataModel.Entities;
+using MUnique.OpenMU.GameLogic.Views.Inventory;
+using MUnique.OpenMU.Network;
+using MUnique.OpenMU.Network.Packets.ServerToClient;
+using MUnique.OpenMU.PlugIns;
+
+/// <summary>
+/// The default implementation of the <see cref="INpcItemBoughtPlugIn"/> which is forwarding everything to the game client with specific data packets.
+/// </summary>
+[PlugIn]
+[Display(Name = nameof(PlugInResources.NpcItemBoughtPlugIn_Name), Description = nameof(PlugInResources.NpcItemBoughtPlugIn_Description), ResourceType = typeof(PlugInResources))]
+[Guid("cf45b5e2-158a-4998-bc73-fed4d4d31c0c")]
+public class NpcItemBoughtPlugIn : INpcItemBoughtPlugIn
+{
+    private readonly RemotePlayer _player;
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="NpcItemBoughtPlugIn"/> class.
+    /// </summary>
+    /// <param name="player">The player.</param>
+    public NpcItemBoughtPlugIn(RemotePlayer player) => this._player = player;
+
+    /// <inheritdoc/>
+    public async ValueTask NpcItemBoughtAsync(Item newItem)
+    {
+        var connection = this._player.Connection;
+        if (connection is null)
+        {
+            return;
+        }
+
+        var itemSerializer = this._player.ItemSerializer;
+
+        int Write()
+        {
+            var size = ItemBoughtRef.GetRequiredSize(itemSerializer.NeededSpace);
+            var span = connection.Output.GetSpan(size)[..size];
+            var packet = new ItemBoughtRef(span)
+            {
+                InventorySlot = newItem.ItemSlot,
+            };
+            var itemSize = itemSerializer.SerializeItem(packet.ItemData, newItem);
+            var actualSize = ItemBoughtRef.GetRequiredSize(itemSize);
+            span.Slice(0, actualSize).SetPacketSize();
+            return actualSize;
+        }
+
+        await connection.SendAsync(Write).ConfigureAwait(false);
+    }
+}