first commit

NitroxServer/Communication/Packets/Processors/PickupItemPacketProcessor.cs

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+using NitroxModel.DataStructures;
+using NitroxModel.DataStructures.GameLogic;
+using NitroxModel.DataStructures.GameLogic.Entities;
+using NitroxModel.DataStructures.Util;
+using NitroxModel.Packets;
+using NitroxServer.Communication.Packets.Processors.Abstract;
+using NitroxServer.GameLogic;
+using NitroxServer.GameLogic.Entities;
+
+namespace NitroxServer.Communication.Packets.Processors;
+
+public class PickupItemPacketProcessor : AuthenticatedPacketProcessor<PickupItem>
+{
+    private readonly EntityRegistry entityRegistry;
+    private readonly WorldEntityManager worldEntityManager;
+    private readonly PlayerManager playerManager;
+    private readonly SimulationOwnershipData simulationOwnershipData;
+
+    public PickupItemPacketProcessor(EntityRegistry entityRegistry, WorldEntityManager worldEntityManager, PlayerManager playerManager, SimulationOwnershipData simulationOwnershipData)
+    {
+        this.entityRegistry = entityRegistry;
+        this.worldEntityManager = worldEntityManager;
+        this.playerManager = playerManager;
+        this.simulationOwnershipData = simulationOwnershipData;
+    }
+
+    public override void Process(PickupItem packet, Player player)
+    {
+        NitroxId id = packet.Item.Id;
+        if (simulationOwnershipData.RevokeOwnerOfId(id))
+        {
+            ushort serverId = ushort.MaxValue;
+            SimulationOwnershipChange simulationOwnershipChange = new(id, serverId, SimulationLockType.TRANSIENT);
+            playerManager.SendPacketToAllPlayers(simulationOwnershipChange);
+        }
+
+        StopTrackingExistingWorldEntity(id);
+
+        entityRegistry.AddOrUpdate(packet.Item);
+
+        // Have other players respawn the item inside the inventory.
+        playerManager.SendPacketToOtherPlayers(new SpawnEntities(packet.Item, forceRespawn: true), player);
+    }
+
+    private void StopTrackingExistingWorldEntity(NitroxId id)
+    {
+        Optional<Entity> entity = entityRegistry.GetEntityById(id);
+
+        if (entity.HasValue && entity.Value is WorldEntity worldEntity)
+        {
+            // Do not track this entity in the open world anymore.
+            worldEntityManager.StopTrackingEntity(worldEntity);
+        }
+    }
+}