refactor: refactor stuff

docs/02_architecture.md

@@ -247,6 +247,27 @@ Loot      -> Enemies.Application                ŹLE
 Combat    -> Enemies.Godot                      ŹLE
 ```
 
+### Wyjątek: `Godot` -> `Godot`
+
+`Domain` i `Application` trzymają się reguły bez wyjątków - tam kontrakt broni czegoś realnego (można podmienić implementację, przetestować logikę bez silnika, nie ma przypadkowego sprzężenia).
+
+`Godot` tego wsparcia nie potrzebuje - kontrolery są celowo "głupie" i nie są objęte testami automatycznymi, więc kontrakt istniałby tam wyłącznie po to, żeby ominąć ograniczenie edytora Godota (`[Export]` nie umie wskazywać na typ-interfejs). Dlatego `Godot` jednego feature'a może importować `Godot` innego feature'a bezpośrednio, najczęściej po to, żeby zawrzeć w scenie węzeł z innego feature'a (`[Export]` na konkretną klasę) i wywołać na nim kilka metod.
+
+```text
+Players.Godot        -> Interactions.Godot      DOBRZE (kontener sceny, wywołanie metod kontrolera)
+Players.Application  -> Interactions.Godot      ŹLE    (logika feature'a nadal tylko przez Contracts)
+Players.Domain       -> Interactions.Godot      ŹLE
+```
+
+`GetNode`/`GetNodeOrNull` po ścieżce w scenie między feature'ami dalej jest niepożądane - zależność ma być jawna (typowane pole `[Export]` albo parametr metody `Initialize`/`Use...`), nie odnajdywana w drzewie sceny w runtime.
+
+Ten wyjątek nie zwalnia z Prawa Demeter. Rozmawiamy tylko z bezpośrednim sąsiadem - jeśli feature trzyma w sobie kontroler innego feature'a, woła na nim metody sam, zamiast wystawiać go dalej do przechodzenia przez łańcuch (`node.Inner.Other.Method()`). Kod spoza feature'a nie powinien wiedzieć, że dany kontroler w ogóle zawiera w sobie coś z innego feature'a.
+
+```text
+player.SetMovementMode(mode)              DOBRZE (PlayerController sam woła w środku Interaction/Body)
+player.Interaction.SetActive(isActive)    ŹLE    (wywołujący łańcuje się przez Playera do Interaction)
+```
+
 ### Eventy między feature'ami
 
 Gdy jedno zdarzenie interesuje wiele feature'ów, feature źródłowy publikuje event i nie wie, kto go słucha:

project.godot

@@ -66,6 +66,26 @@ move_down={
 "events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":4194326,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
 ]
 }
+interact={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":69,"key_label":0,"unicode":101,"location":0,"echo":false,"script":null)
+]
+}
+use_left_hand={
+"deadzone": 0.2,
+"events": [Object(InputEventMouseButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":0,"position":Vector2(0, 0),"global_position":Vector2(0, 0),"factor":1.0,"button_index":1,"canceled":false,"pressed":false,"double_click":false,"script":null)
+]
+}
+use_right_hand={
+"deadzone": 0.2,
+"events": [Object(InputEventMouseButton,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"button_mask":0,"position":Vector2(0, 0),"global_position":Vector2(0, 0),"factor":1.0,"button_index":2,"canceled":false,"pressed":false,"double_click":false,"script":null)
+]
+}
+drop_modifier={
+"deadzone": 0.2,
+"events": [Object(InputEventKey,"resource_local_to_scene":false,"resource_name":"","device":-1,"window_id":0,"alt_pressed":false,"shift_pressed":false,"ctrl_pressed":false,"meta_pressed":false,"pressed":false,"keycode":0,"physical_keycode":71,"key_label":0,"unicode":103,"location":0,"echo":false,"script":null)
+]
+}
 
 [physics]
 

src/Features/Console/Application/Commands/HostCommand.cs

@@ -0,0 +1,29 @@
+using System.Collections.Generic;
+using Game.Features.Console.Contracts;
+using Game.Features.Multiplayer.Contracts;
+using Game.Features.Multiplayer.Contracts.Exceptions;
+
+namespace Game.Features.Console.Application.Commands;
+
+public sealed class HostCommand(IMultiplayerPeer multiplayer) : ICommand
+{
+    public string Name => "host";
+    public string Description => "Starts hosting a multiplayer session on the given port.";
+    public IReadOnlyList<CommandArgSpec> Args { get; } = new CommandArgsBuilder().AddIntArg("port").Build();
+
+    public CommandResult Execute(CommandArgValues args)
+    {
+        int port = args.GetInt(0);
+
+        try
+        {
+            multiplayer.Host(port);
+        }
+        catch (MultiplayerException ex)
+        {
+            return CommandResult.Fail(ex.Message);
+        }
+
+        return CommandResult.Ok($"Hosting on port {port}.");
+    }
+}

src/Features/Console/Application/Commands/HostCommand.cs.uid

@@ -0,0 +1 @@
+uid://crmnspnxcut3y

src/Features/Console/Application/Commands/JoinCommand.cs

@@ -0,0 +1,35 @@
+using System.Collections.Generic;
+using Game.Features.Console.Contracts;
+using Game.Features.Multiplayer.Contracts;
+using Game.Features.Multiplayer.Contracts.Exceptions;
+
+namespace Game.Features.Console.Application.Commands;
+
+public sealed class JoinCommand(IMultiplayerPeer multiplayer) : ICommand
+{
+    private const string AddressPattern =
+        @"^(localhost|((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?))$";
+
+    public string Name => "join";
+    public string Description => "Joins a multiplayer session at the given address and port.";
+
+    public IReadOnlyList<CommandArgSpec> Args { get; } =
+        new CommandArgsBuilder().AddRegexArg("address", AddressPattern).AddIntArg("port").Build();
+
+    public CommandResult Execute(CommandArgValues args)
+    {
+        string address = args.GetString(0);
+        int port = args.GetInt(1);
+
+        try
+        {
+            multiplayer.Join(address, port);
+        }
+        catch (MultiplayerException ex)
+        {
+            return CommandResult.Fail(ex.Message);
+        }
+
+        return CommandResult.Ok($"Connecting to {address}:{port}...");
+    }
+}

src/Features/Console/Application/Commands/JoinCommand.cs.uid

@@ -0,0 +1 @@
+uid://c80rskv3u7su7

src/Features/Console/Application/Commands/SpawnItemCommand.cs

@@ -0,0 +1,44 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Game.Features.Console.Contracts;
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Console.Application.Commands;
+
+public sealed class SpawnItemCommand : ICommand
+{
+    private readonly IItemSpawner _spawner;
+    private readonly IItemSpawnPoint _spawnPoint;
+
+    public string Name => "spawn_item";
+    public string Description => "Spawns an item in front of the player.";
+    public IReadOnlyList<CommandArgSpec> Args { get; }
+
+    public SpawnItemCommand(IItemSpawner spawner, IItemDefinitionRegistry registry, IItemSpawnPoint spawnPoint)
+    {
+        _spawner = spawner;
+        _spawnPoint = spawnPoint;
+
+        string[] definitions = registry.DefinitionIds
+            .Select(id => id.Value)
+            .OrderBy(id => id, StringComparer.Ordinal)
+            .ToArray();
+
+        Args = new CommandArgsBuilder().AddChoiceArg("item", definitions).Build();
+    }
+
+    public CommandResult Execute(CommandArgValues args)
+    {
+        ItemDefinitionId definitionId = new(args.GetString(0));
+        ItemActionResult result = _spawner.TrySpawn(
+            definitionId,
+            _spawnPoint.GetItemSpawnPosition(),
+            out ItemInstanceId itemId
+        );
+
+        return result.Success
+            ? CommandResult.Ok($"Spawned {definitionId} ({itemId}).")
+            : CommandResult.Fail(result.Message);
+    }
+}

src/Features/Console/Application/Commands/SpawnItemCommand.cs.uid

@@ -0,0 +1 @@
+uid://e8m3q6v1r9k4w

src/Features/Console/Contracts/CommandArgSpec.cs

@@ -8,13 +8,20 @@ public enum CommandArgType
     Int,
     Float,
     Bool,
-    Choice
+    Choice,
+    Regex
 }
 
-public sealed record CommandArgSpec(string Name, CommandArgType Type, IReadOnlyList<string> Choices = null)
+public sealed record CommandArgSpec(
+    string Name,
+    CommandArgType Type,
+    IReadOnlyList<string> Choices = null,
+    string Pattern = null
+) {
+    public override string ToString() => Type switch
     {
-    public override string ToString() =>
+        CommandArgType.Choice when Choices is not null => string.Join("|", Choices),
-        Type == CommandArgType.Choice && Choices is not null
+        CommandArgType.Regex when Pattern is not null => "regex",
-            ? string.Join("|", Choices)
+        _ => Type.ToString().ToLowerInvariant()
-            : Type.ToString().ToLowerInvariant();
+    };
 }

src/Features/Console/Contracts/CommandArgsBuilder.cs

@@ -36,5 +36,11 @@ public sealed class CommandArgsBuilder
         return this;
     }
 
+    public CommandArgsBuilder AddRegexArg(string name, string pattern)
+    {
+        _specs.Add(new CommandArgSpec(name, CommandArgType.Regex, Pattern: pattern));
+        return this;
+    }
+
     public IReadOnlyList<CommandArgSpec> Build() => _specs.ToArray();
 }

src/Features/Console/Domain/CommandArgValidator.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Globalization;
 using System.Linq;
+using System.Text.RegularExpressions;
 using Game.Features.Console.Contracts;
 
 namespace Game.Features.Console.Domain;
@@ -18,6 +19,7 @@ public static class CommandArgValidator
         CommandArgType.Float => float.TryParse(rawValue, NumberStyles.Float, CultureInfo.InvariantCulture, out _),
         CommandArgType.Bool => bool.TryParse(rawValue, out _),
         CommandArgType.Choice => spec.Choices is not null && ChoicesContain(spec.Choices, rawValue),
+        CommandArgType.Regex => spec.Pattern is not null && Regex.IsMatch(rawValue, spec.Pattern),
         _ => throw new ArgumentOutOfRangeException(nameof(spec), spec.Type, null)
     };
 

src/Features/Console/Godot/ConsoleController.cs

@@ -1,6 +1,7 @@
 using Game.Features.Console.Application;
 using Game.Features.Console.Contracts;
 using Game.Features.Console.Infrastructure;
+using Game.Features.Logging.Contracts;
 using Game.Godot;
 using Game.Godot.Extensions;
 using Game.Godot.Mappings;
@@ -8,7 +9,7 @@ using Godot;
 
 namespace Game.Features.Console.Godot;
 
-public partial class ConsoleController : CanvasLayer
+public partial class ConsoleController : CanvasLayer, ILogTarget
 {
     [Export] public LineEdit CommandInput;
     [Export] public RichTextLabel OutputLog;
@@ -33,16 +34,6 @@ public partial class ConsoleController : CanvasLayer
         }
     }
     
-    private void AppendLine(string line)
-    {
-        OutputLog.AppendText(line + "\n");
-    }
-
-    public void UseCommandRegistry(ICommandRegistry registry)
-    {
-        _commandExecute = new CommandExecute(registry);
-    }
-    
     private void OnInputSubmitted(string text)
     {
         CommandInput.Clear();
@@ -64,6 +55,21 @@ public partial class ConsoleController : CanvasLayer
         }
     }
 
+    private void AppendLine(string line)
+    {
+        OutputLog.AppendText(line + "\n");
+    }
+    
+    public void UseCommandRegistry(ICommandRegistry registry)
+    {
+        _commandExecute = new CommandExecute(registry);
+    }
+    
+    public void WriteLogLine(string logLine)
+    {
+        AppendLine(logLine);
+    }
+
     public override void _Ready()
     {
         this.AssertRequiredExports();

src/Features/Interactions/Application/Interact.cs

@@ -0,0 +1,21 @@
+using Game.Features.Interactions.Contracts;
+
+namespace Game.Features.Interactions.Application;
+
+public sealed class Interact(IInteractionRegistry registry) : IInteractionHandler
+{
+    public InteractionResult TryInteract(InteractionRequest request)
+    {
+        if (!registry.TryGetTarget(request.TargetId, out IInteractionTarget target))
+        {
+            return InteractionResult.Fail(InteractionStatus.TargetNotFound, $"Target {request.TargetId} was not found.");
+        }
+
+        if (!target.CanInteract)
+        {
+            return InteractionResult.Fail(InteractionStatus.Unavailable, "The target is not currently available.");
+        }
+
+        return target.Execute(request.PlayerId);
+    }
+}

src/Features/Interactions/Application/Interact.cs.uid

@@ -0,0 +1 @@
+uid://b1m7q4y9c5v2n

src/Features/Interactions/Application/ResolvePickupAvailability.cs

@@ -0,0 +1,19 @@
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Interactions.Application;
+
+public readonly record struct PickupAvailability(bool LeftHand, bool RightHand, bool RequiresBoth);
+
+public sealed class ResolvePickupAvailability
+{
+    public PickupAvailability Resolve(HandRequirement requirement, bool leftHandFree, bool rightHandFree)
+    {
+        if (requirement == HandRequirement.Both)
+        {
+            bool canUseBoth = leftHandFree && rightHandFree;
+            return new PickupAvailability(canUseBoth, canUseBoth, true);
+        }
+
+        return new PickupAvailability(leftHandFree, rightHandFree, false);
+    }
+}

src/Features/Interactions/Application/ResolvePickupAvailability.cs.uid

@@ -0,0 +1 @@
+uid://c6mhpn06a47qu

src/Features/Interactions/Contracts/IInteractionHandler.cs

@@ -0,0 +1,6 @@
+namespace Game.Features.Interactions.Contracts;
+
+public interface IInteractionHandler
+{
+    InteractionResult TryInteract(InteractionRequest request);
+}

src/Features/Interactions/Contracts/IInteractionHandler.cs.uid

@@ -0,0 +1 @@
+uid://a3n8v5r1q7m9c

src/Features/Interactions/Contracts/IInteractionRegistry.cs

@@ -0,0 +1,8 @@
+namespace Game.Features.Interactions.Contracts;
+
+public interface IInteractionRegistry
+{
+    void Register(IInteractionTarget target);
+    void Unregister(InteractionTargetId targetId);
+    bool TryGetTarget(InteractionTargetId targetId, out IInteractionTarget target);
+}

src/Features/Interactions/Contracts/IInteractionRegistry.cs.uid

@@ -0,0 +1 @@
+uid://baejppnflmpnn

src/Features/Interactions/Contracts/IInteractionTarget.cs

@@ -0,0 +1,12 @@
+using Game.Features.Players.Contracts;
+
+namespace Game.Features.Interactions.Contracts;
+
+public interface IInteractionTarget
+{
+    InteractionTargetId InteractionTargetId { get; }
+    bool CanInteract { get; }
+    InteractionPrompt Prompt { get; }
+
+    InteractionResult Execute(PlayerId playerId);
+}

src/Features/Interactions/Contracts/IInteractionTarget.cs.uid

@@ -0,0 +1 @@
+uid://c7p2y5n8f1v6m

src/Features/Interactions/Contracts/InteractionPrompt.cs

@@ -0,0 +1,3 @@
+namespace Game.Features.Interactions.Contracts;
+
+public readonly record struct InteractionPrompt(string Text);

src/Features/Interactions/Contracts/InteractionPrompt.cs.uid

@@ -0,0 +1 @@
+uid://b3m8r1x6d9w4k

src/Features/Interactions/Contracts/InteractionRequest.cs

@@ -0,0 +1,5 @@
+using Game.Features.Players.Contracts;
+
+namespace Game.Features.Interactions.Contracts;
+
+public readonly record struct InteractionRequest(PlayerId PlayerId, InteractionTargetId TargetId);

src/Features/Interactions/Contracts/InteractionRequest.cs.uid

@@ -0,0 +1 @@
+uid://e2q7k5n1w8m4d

src/Features/Interactions/Contracts/InteractionResult.cs

@@ -0,0 +1,10 @@
+namespace Game.Features.Interactions.Contracts;
+
+public readonly record struct InteractionResult(InteractionStatus Status, string Message = "")
+{
+    public bool Success => Status == InteractionStatus.Success;
+
+    public static InteractionResult Ok() => new(InteractionStatus.Success);
+
+    public static InteractionResult Fail(InteractionStatus status, string message) => new(status, message);
+}

src/Features/Interactions/Contracts/InteractionResult.cs.uid

@@ -0,0 +1 @@
+uid://f9w2d7k4m6q1x

src/Features/Interactions/Contracts/InteractionStatus.cs

@@ -0,0 +1,9 @@
+namespace Game.Features.Interactions.Contracts;
+
+public enum InteractionStatus
+{
+    Success,
+    TargetNotFound,
+    Unavailable,
+    Rejected
+}

src/Features/Interactions/Contracts/InteractionStatus.cs.uid

@@ -0,0 +1 @@
+uid://b4y9m3r6v1c8p

src/Features/Interactions/Contracts/InteractionTargetId.cs

@@ -0,0 +1,10 @@
+using Game.Shared.Domain;
+
+namespace Game.Features.Interactions.Contracts;
+
+public readonly record struct InteractionTargetId(InstanceId Value)
+{
+    public static InteractionTargetId From(InstanceId value) => new(value);
+
+    public override string ToString() => Value.ToString();
+}

src/Features/Interactions/Contracts/InteractionTargetId.cs.uid

@@ -0,0 +1 @@
+uid://c6m1v8q4r9x2k

src/Features/Interactions/Domain/DropPosition.cs

@@ -0,0 +1,26 @@
+using Godot;
+
+namespace Game.Features.Interactions.Domain;
+
+public readonly record struct DropRayHit(
+    Vector3 Origin,
+    Vector3 Direction,
+    float RayLength,
+    bool IsBlocked,
+    Vector3 BlockPoint
+);
+
+public static class DropPosition
+{
+    public static Vector3 CalculateFrom(DropRayHit hit)
+    {
+        float distance = hit.RayLength;
+
+        if (hit.IsBlocked)
+        {
+            distance = Mathf.Max(0.25f, hit.Origin.DistanceTo(hit.BlockPoint) - 0.2f);
+        }
+
+        return hit.Origin + hit.Direction * distance;
+    }
+}

src/Features/Interactions/Domain/DropPosition.cs.uid

@@ -0,0 +1 @@
+uid://derjakse05m3d

src/Features/Interactions/Godot/InteractableController.cs

@@ -0,0 +1,58 @@
+using Game.Features.Interactions.Contracts;
+using Game.Features.Players.Contracts;
+using Game.Godot.Extensions;
+using Godot;
+using Godot.Collections;
+
+namespace Game.Features.Interactions.Godot;
+
+public abstract partial class InteractableController : Node3D, IInteractionTarget
+{
+    public const string InteractionGroup = "interactions";
+
+    [Export]
+    public string InstanceKey;
+
+    [Export]
+    public string PromptText = "Wejdź w interakcję";
+
+    public InteractionTargetId InteractionTargetId { get; private set; }
+    public virtual bool CanInteract => true;
+    public InteractionPrompt Prompt => new(PromptText);
+
+    private InteractionsRegistryController _registry;
+
+    private void RegisterWithAvailableRegistry()
+    {
+        Array<Node> availableRegistries = GetTree()
+            .GetNodesInGroup(InteractionsRegistryController.RegistryGroup);
+
+        foreach (Node node in availableRegistries)
+        {
+            if (node is InteractionsRegistryController registry)
+            {
+                registry.Register(this);
+                return;
+            }
+        }
+    }
+
+    public void UseRegistry(InteractionsRegistryController registry)
+    {
+        _registry = registry;
+    }
+
+    public abstract InteractionResult Execute(PlayerId playerId);
+
+    public override void _ExitTree()
+    {
+        _registry?.Unregister(InteractionTargetId);
+    }
+
+    public override void _Ready()
+    {
+        InteractionTargetId = InteractionTargetId.From(this.GetStableInstanceIdFrom(InstanceKey));
+        AddToGroup(InteractionGroup);
+        RegisterWithAvailableRegistry();
+    }
+}

src/Features/Interactions/Godot/InteractableController.cs.uid

@@ -0,0 +1 @@
+uid://bh0e1kwa1i4r

src/Features/Interactions/Godot/InteractionPromptController.cs

@@ -0,0 +1,27 @@
+using Game.Godot.Extensions;
+using Godot;
+
+namespace Game.Features.Interactions.Godot;
+
+public partial class InteractionPromptController : CanvasLayer
+{
+    [Export] public Label PromptLabel;
+
+    public override void _Ready()
+    {
+        this.AssertRequiredExports();
+        Clear();
+    }
+
+    public void ShowPrompt(string text)
+    {
+        PromptLabel.Text = text;
+        PromptLabel.Visible = text.Length > 0;
+    }
+
+    public void Clear()
+    {
+        PromptLabel.Text = string.Empty;
+        PromptLabel.Visible = false;
+    }
+}

src/Features/Interactions/Godot/InteractionPromptController.cs.uid

@@ -0,0 +1 @@
+uid://b9r2w6n4f8k1v

src/Features/Interactions/Godot/InteractionRaycaster.cs

@@ -0,0 +1,26 @@
+using Godot;
+
+namespace Game.Features.Interactions.Godot;
+
+public partial class InteractionRaycaster : RayCast3D
+{
+    public T GetTargetOrNull<T>() where T : class
+    {
+        if (!IsColliding() || GetCollider() is not Node node)
+        {
+            return null;
+        }
+
+        while (node is not null)
+        {
+            if (node is T target)
+            {
+                return target;
+            }
+
+            node = node.GetParent();
+        }
+
+        return null;
+    }
+}

src/Features/Interactions/Godot/InteractionRaycaster.cs.uid

@@ -0,0 +1 @@
+uid://e4m7k1x8c3q6h

src/Features/Interactions/Godot/InteractionsRegistryController.cs

@@ -0,0 +1,47 @@
+using Game.Features.Interactions.Contracts;
+using Godot;
+using GodotNodeArray = Godot.Collections.Array<Godot.Node>;
+
+namespace Game.Features.Interactions.Godot;
+
+public partial class InteractionsRegistryController : Node
+{
+    public const string RegistryGroup = "interactions_registry";
+
+    private IInteractionRegistry _registry;
+
+    private GodotNodeArray GetInteractionTargetNodesInScene() =>
+        GetTree().GetNodesInGroup(InteractableController.InteractionGroup);
+
+    public override void _EnterTree()
+    {
+        AddToGroup(RegistryGroup);
+    }
+
+    public void UseRegistry(IInteractionRegistry registry)
+    {
+        _registry = registry;
+    }
+
+    public void RegisterSceneTargets()
+    {
+        foreach (Node node in GetInteractionTargetNodesInScene())
+        {
+            if (node is InteractableController target)
+            {
+                Register(target);
+            }
+        }
+    }
+
+    public void Register(InteractableController target)
+    {
+        _registry.Register(target);
+        target.UseRegistry(this);
+    }
+
+    public void Unregister(InteractionTargetId targetId)
+    {
+        _registry.Unregister(targetId);
+    }
+}

src/Features/Interactions/Godot/InteractionsRegistryController.cs.uid

@@ -0,0 +1 @@
+uid://f6q1c9m4w7v2n

src/Features/Interactions/Godot/PlayerInteractionController.cs

@@ -0,0 +1,243 @@
+using System.Collections.Generic;
+using Game.Features.Interactions.Application;
+using Game.Features.Interactions.Contracts;
+using Game.Features.Interactions.Domain;
+using Game.Features.Items.Contracts;
+using Game.Features.Players.Contracts;
+using Game.Godot;
+using Game.Godot.Exceptions;
+using Game.Godot.Extensions;
+using Game.Godot.Mappings;
+using Godot;
+
+namespace Game.Features.Interactions.Godot;
+
+public partial class PlayerInteractionController : Node, IItemSpawnPoint
+{
+    [Export]
+    public Camera3D Camera;
+
+    [Export]
+    public CharacterBody3D Body;
+
+    [Export]
+    public InteractionRaycaster InteractionRaycaster;
+
+    [Export]
+    public RayCast3D DropRaycaster;
+
+    [Export]
+    public InteractionPromptController PromptController;
+
+    [Export]
+    public Node3D LeftHandAnchor;
+
+    [Export]
+    public Node3D RightHandAnchor;
+
+    private IItemInteractionService _items;
+    private IInteractionHandler _interactions;
+    private PlayerId _playerId;
+    private readonly HashSet<Hand> _dropActions = [];
+    private readonly ResolvePickupAvailability _resolvePickupAvailability = new();
+
+    private ItemUseRequest CreateUseRequest(Hand hand, ItemActionPhase phase)
+    {
+        InteractionTargetId? targetId = InteractionRaycaster
+            .GetTargetOrNull<IInteractionTarget>()
+            ?.InteractionTargetId;
+
+        return new ItemUseRequest(_playerId, hand, phase, targetId);
+    }
+
+    private void ProcessHandActionStarted(Hand hand)
+    {
+        if (Input.IsActionPressed(InputAction.DropModifier.ActionName()))
+        {
+            _items.TryUse(new ItemUseRequest(_playerId, hand, ItemActionPhase.Cancelled));
+            _items.TryDrop(hand, CalculateDropPosition());
+            _dropActions.Add(hand);
+            return;
+        }
+
+        if (!_items.IsHandFree(hand))
+        {
+            _items.TryUse(CreateUseRequest(hand, ItemActionPhase.Started));
+            return;
+        }
+
+        IPickupTarget target = InteractionRaycaster.GetTargetOrNull<IPickupTarget>();
+        if (target is not null)
+        {
+            _items.TryPickup(target.ItemInfo.Id, hand);
+        }
+    }
+
+    private void ProcessHandActionCompleted(Hand hand)
+    {
+        if (_dropActions.Remove(hand))
+        {
+            return;
+        }
+
+        _items.TryUse(new ItemUseRequest(_playerId, hand, ItemActionPhase.Completed));
+    }
+
+    private Vector3 CalculateDropPosition()
+    {
+        DropRaycaster.ForceRaycastUpdate();
+
+        bool isBlocked = DropRaycaster.IsColliding();
+        DropRayHit hit = new(
+            Camera.GlobalPosition,
+            -Camera.GlobalBasis.Z.Normalized(),
+            DropRaycaster.TargetPosition.Length(),
+            isBlocked,
+            isBlocked ? DropRaycaster.GetCollisionPoint() : default
+        );
+
+        return DropPosition.CalculateFrom(hit);
+    }
+
+    private void UpdatePrompt()
+    {
+        IPickupTarget pickupTarget = InteractionRaycaster.GetTargetOrNull<IPickupTarget>();
+        if (pickupTarget is not null)
+        {
+            ShowPickupPrompt(pickupTarget.ItemInfo);
+            return;
+        }
+
+        IInteractionTarget interactionTarget = InteractionRaycaster.GetTargetOrNull<IInteractionTarget>();
+        if (interactionTarget?.CanInteract == true)
+        {
+            PromptController.ShowPrompt($"[E] {interactionTarget.Prompt.Text}");
+            return;
+        }
+
+        PromptController.Clear();
+    }
+
+    private void ShowPickupPrompt(ItemInfo itemInfo)
+    {
+        PickupAvailability availability = _resolvePickupAvailability.Resolve(
+            itemInfo.HandRequirement,
+            _items.IsHandFree(Hand.Left),
+            _items.IsHandFree(Hand.Right)
+        );
+
+        if (availability.RequiresBoth)
+        {
+            PromptController.ShowPrompt(
+                availability.LeftHand
+                    ? $"[LPM lub PPM] Podnieś {itemInfo.DisplayName} — obie ręce"
+                    : "Potrzebujesz obu wolnych rąk"
+            );
+            return;
+        }
+
+        List<string> actions = [];
+
+        if (availability.LeftHand)
+        {
+            actions.Add($"[LPM] Podnieś {itemInfo.DisplayName} — lewa ręka");
+        }
+
+        if (availability.RightHand)
+        {
+            actions.Add($"[PPM] Podnieś {itemInfo.DisplayName} — prawa ręka");
+        }
+
+        PromptController.ShowPrompt(
+            actions.Count > 0 ? string.Join("\n", actions) : "Brak wolnej ręki"
+        );
+    }
+
+    public void Initialize(
+        PlayerId playerId,
+        IItemInteractionService items,
+        IInteractionHandler interactions
+    )
+    {
+        _playerId = playerId;
+        _items = items;
+        _interactions = interactions;
+    }
+
+    public Vector3 GetItemSpawnPosition() => CalculateDropPosition();
+
+    public override void _Ready()
+    {
+        this.AssertRequiredExports();
+    }
+
+    public override void _Process(double delta)
+    {
+        if (_items is null || _interactions is null)
+        {
+            throw new ControllerNotInitializedException(Name);
+        }
+
+        if (GamePause.IsPaused || !MouseCapture.IsCaptured)
+        {
+            PromptController.Clear();
+            return;
+        }
+
+        UpdatePrompt();
+    }
+
+    public override void _UnhandledInput(InputEvent @event)
+    {
+        if (_items is null || _interactions is null)
+        {
+            throw new ControllerNotInitializedException(Name);
+        }
+
+        if (GamePause.IsPaused || !MouseCapture.IsCaptured)
+        {
+            return;
+        }
+
+        if (@event.IsActionPressed(InputAction.UseLeftHand.ActionName()))
+        {
+            ProcessHandActionStarted(Hand.Left);
+            GetViewport().SetInputAsHandled();
+            return;
+        }
+
+        if (@event.IsActionReleased(InputAction.UseLeftHand.ActionName()))
+        {
+            ProcessHandActionCompleted(Hand.Left);
+            GetViewport().SetInputAsHandled();
+            return;
+        }
+
+        if (@event.IsActionPressed(InputAction.UseRightHand.ActionName()))
+        {
+            ProcessHandActionStarted(Hand.Right);
+            GetViewport().SetInputAsHandled();
+            return;
+        }
+
+        if (@event.IsActionReleased(InputAction.UseRightHand.ActionName()))
+        {
+            ProcessHandActionCompleted(Hand.Right);
+            GetViewport().SetInputAsHandled();
+            return;
+        }
+
+        if (@event.IsActionPressed(InputAction.Interact.ActionName()))
+        {
+            IInteractionTarget target = InteractionRaycaster.GetTargetOrNull<IInteractionTarget>();
+            if (target?.CanInteract == true)
+            {
+                _interactions.TryInteract(
+                    new InteractionRequest(_playerId, target.InteractionTargetId)
+                );
+            }
+
+            GetViewport().SetInputAsHandled();
+        }
+    }
+}

src/Features/Interactions/Godot/PlayerInteractionController.cs.uid

@@ -0,0 +1 @@
+uid://c2v8m5r1y7q4d

src/Features/Interactions/Infrastructure/InteractionRegistry.cs

@@ -0,0 +1,41 @@
+using System;
+using System.Collections.Generic;
+using Game.Features.Interactions.Contracts;
+
+namespace Game.Features.Interactions.Infrastructure;
+
+public sealed class InteractionRegistry : IInteractionRegistry
+{
+    private readonly Dictionary<InteractionTargetId, IInteractionTarget> _interactionTargetsById =
+    [];
+
+    public void Register(IInteractionTarget target)
+    {
+        if (
+            _interactionTargetsById.TryGetValue(
+                target.InteractionTargetId,
+                out IInteractionTarget existing
+            )
+        )
+        {
+            if (ReferenceEquals(existing, target))
+            {
+                return;
+            }
+
+            throw new InvalidOperationException(
+                $"Duplicate interaction target id: {target.InteractionTargetId}."
+            );
+        }
+
+        _interactionTargetsById.Add(target.InteractionTargetId, target);
+    }
+
+    public void Unregister(InteractionTargetId targetId)
+    {
+        _interactionTargetsById.Remove(targetId);
+    }
+
+    public bool TryGetTarget(InteractionTargetId targetId, out IInteractionTarget target) =>
+        _interactionTargetsById.TryGetValue(targetId, out target);
+}

src/Features/Interactions/Infrastructure/InteractionRegistry.cs.uid

@@ -0,0 +1 @@
+uid://dtnwqalxdu6n2

src/Features/Items/Application/ItemInteractionService.cs

@@ -0,0 +1,108 @@
+using System.Collections.Generic;
+using Game.Features.Interactions.Contracts;
+using Game.Features.Items.Contracts;
+using Game.Features.Items.Domain;
+using Godot;
+
+namespace Game.Features.Items.Application;
+
+public sealed class ItemInteractionService(
+    HandsInventory hands,
+    IItemInstanceRegistry itemRegistry,
+    IHeldItemPresenter presenter
+) : IItemInteractionService
+{
+    private readonly Dictionary<Hand, InteractionTargetId?> _activeUseTargets = [];
+
+    public bool IsHandFree(Hand hand) => hands.IsFree(hand);
+
+    public ItemInstanceId? GetHeldItem(Hand hand) => hands.Get(hand);
+
+    public ItemActionResult TryPickup(ItemInstanceId itemId, Hand hand)
+    {
+        if (!itemRegistry.TryGet(itemId, out IItemInstance item))
+        {
+            return ItemActionResult.Fail(ItemActionStatus.ItemNotFound, $"Item {itemId} was not found.");
+        }
+
+        if (!hands.TryHold(itemId, item.Info.HandRequirement, hand))
+        {
+            return ItemActionResult.Fail(ItemActionStatus.HandOccupied, "The requested hand is not available.");
+        }
+
+        if (presenter.TryShowHeld(item, hand))
+        {
+            return ItemActionResult.Ok();
+        }
+
+        hands.Release(hand);
+        return ItemActionResult.Fail(ItemActionStatus.PresentationFailed, "Could not present the held item.");
+    }
+
+    public ItemActionResult TryUse(ItemUseRequest request)
+    {
+        if (request.Phase == ItemActionPhase.Started)
+        {
+            ItemActionResult startResult = ExecuteUse(request);
+            if (startResult.Success)
+            {
+                _activeUseTargets[request.Hand] = request.TargetId;
+            }
+
+            return startResult;
+        }
+
+        if (!_activeUseTargets.Remove(request.Hand, out InteractionTargetId? activeTargetId))
+        {
+            return ItemActionResult.Ok();
+        }
+
+        return ExecuteUse(request with { TargetId = activeTargetId });
+    }
+
+    private ItemActionResult ExecuteUse(ItemUseRequest request)
+    {
+        ItemInstanceId? itemId = hands.Get(request.Hand);
+        if (itemId is null)
+        {
+            return ItemActionResult.Fail(ItemActionStatus.HandEmpty, "The requested hand is empty.");
+        }
+
+        if (!itemRegistry.TryGet(itemId.Value, out IItemInstance item))
+        {
+            return ItemActionResult.Fail(ItemActionStatus.ItemNotFound, $"Item {itemId} was not found.");
+        }
+
+        ItemActionResult result = item.Use(request);
+        if (result.Success)
+        {
+            presenter.Refresh(item);
+        }
+
+        return result;
+    }
+
+    public ItemActionResult TryDrop(Hand hand, Vector3 worldPosition)
+    {
+        ItemInstanceId? itemId = hands.Get(hand);
+        if (itemId is null)
+        {
+            return ItemActionResult.Fail(ItemActionStatus.HandEmpty, "The requested hand is empty.");
+        }
+
+        if (!itemRegistry.TryGet(itemId.Value, out IItemInstance item))
+        {
+            return ItemActionResult.Fail(ItemActionStatus.ItemNotFound, $"Item {itemId} was not found.");
+        }
+
+        hands.Release(hand);
+
+        if (presenter.TryShowDropped(item, worldPosition))
+        {
+            return ItemActionResult.Ok();
+        }
+
+        hands.TryHold(itemId.Value, item.Info.HandRequirement, hand);
+        return ItemActionResult.Fail(ItemActionStatus.PresentationFailed, "Could not present the dropped item.");
+    }
+}

src/Features/Items/Application/ItemInteractionService.cs.uid

@@ -0,0 +1 @@
+uid://e6q2h9v5b8k3p

src/Features/Items/Contracts/Hand.cs

@@ -0,0 +1,7 @@
+namespace Game.Features.Items.Contracts;
+
+public enum Hand
+{
+    Left,
+    Right
+}

src/Features/Items/Contracts/Hand.cs.uid

@@ -0,0 +1 @@
+uid://c4n7h2w8m5q1p

src/Features/Items/Contracts/HandRequirement.cs

@@ -0,0 +1,7 @@
+namespace Game.Features.Items.Contracts;
+
+public enum HandRequirement
+{
+    One,
+    Both
+}

src/Features/Items/Contracts/HandRequirement.cs.uid

@@ -0,0 +1 @@
+uid://d8p3k6v1r9y4b

src/Features/Items/Contracts/IHeldItemPresenter.cs

@@ -0,0 +1,10 @@
+using Godot;
+
+namespace Game.Features.Items.Contracts;
+
+public interface IHeldItemPresenter
+{
+    bool TryShowHeld(IItemInstance item, Hand hand);
+    bool TryShowDropped(IItemInstance item, Vector3 worldPosition);
+    void Refresh(IItemInstance item);
+}

src/Features/Items/Contracts/IHeldItemPresenter.cs.uid

@@ -0,0 +1 @@
+uid://c1q7y4d9m5x2v

src/Features/Items/Contracts/IItemDefinitionRegistry.cs

@@ -0,0 +1,10 @@
+using System.Collections.Generic;
+
+namespace Game.Features.Items.Contracts;
+
+public interface IItemDefinitionRegistry
+{
+    IReadOnlyCollection<ItemDefinitionId> DefinitionIds { get; }
+    bool TryRegister(ItemDefinitionId definitionId, ItemDefinition definition);
+    bool TryGetDefinition(ItemDefinitionId definitionId, out ItemDefinition definition);
+}

src/Features/Items/Contracts/IItemDefinitionRegistry.cs.uid

@@ -0,0 +1 @@
+uid://kjka28plyqeo

src/Features/Items/Contracts/IItemInstance.cs

@@ -0,0 +1,7 @@
+namespace Game.Features.Items.Contracts;
+
+public interface IItemInstance
+{
+    ItemInfo Info { get; }
+    ItemActionResult Use(ItemUseRequest request);
+}

src/Features/Items/Contracts/IItemInstance.cs.uid

@@ -0,0 +1 @@
+uid://b5x9q3h7m2w8f

src/Features/Items/Contracts/IItemInstanceRegistry.cs

@@ -0,0 +1,8 @@
+namespace Game.Features.Items.Contracts;
+
+public interface IItemInstanceRegistry
+{
+    void Register(ItemInstanceId itemId, IItemInstance item);
+    void Unregister(ItemInstanceId itemId);
+    bool TryGet(ItemInstanceId itemId, out IItemInstance item);
+}

src/Features/Items/Contracts/IItemInstanceRegistry.cs.uid

@@ -0,0 +1 @@
+uid://s83yytevpj52

src/Features/Items/Contracts/IItemInteractionService.cs

@@ -0,0 +1,12 @@
+using Godot;
+
+namespace Game.Features.Items.Contracts;
+
+public interface IItemInteractionService
+{
+    bool IsHandFree(Hand hand);
+    ItemInstanceId? GetHeldItem(Hand hand);
+    ItemActionResult TryPickup(ItemInstanceId itemId, Hand hand);
+    ItemActionResult TryUse(ItemUseRequest request);
+    ItemActionResult TryDrop(Hand hand, Vector3 worldPosition);
+}

src/Features/Items/Contracts/IItemInteractionService.cs.uid

@@ -0,0 +1 @@
+uid://f2k8q5b1w7m4n

src/Features/Items/Contracts/IItemSpawnPoint.cs

@@ -0,0 +1,8 @@
+using Godot;
+
+namespace Game.Features.Items.Contracts;
+
+public interface IItemSpawnPoint
+{
+    Vector3 GetItemSpawnPosition();
+}

src/Features/Items/Contracts/IItemSpawnPoint.cs.uid

@@ -0,0 +1 @@
+uid://a2v6r8m3q7k5d

src/Features/Items/Contracts/IItemSpawner.cs

@@ -0,0 +1,12 @@
+using Godot;
+
+namespace Game.Features.Items.Contracts;
+
+public interface IItemSpawner
+{
+    ItemActionResult TrySpawn(
+        ItemDefinitionId definitionId,
+        Vector3 worldPosition,
+        out ItemInstanceId itemId
+    );
+}

src/Features/Items/Contracts/IItemSpawner.cs.uid

@@ -0,0 +1 @@
+uid://f4m9k2w6b8n1r

src/Features/Items/Contracts/IPickupTarget.cs

@@ -0,0 +1,6 @@
+namespace Game.Features.Items.Contracts;
+
+public interface IPickupTarget
+{
+    ItemInfo ItemInfo { get; }
+}

src/Features/Items/Contracts/IPickupTarget.cs.uid

@@ -0,0 +1 @@
+uid://c9v4g7p2m5x8d

src/Features/Items/Contracts/ItemActionPhase.cs

@@ -0,0 +1,8 @@
+namespace Game.Features.Items.Contracts;
+
+public enum ItemActionPhase
+{
+    Started,
+    Completed,
+    Cancelled
+}

src/Features/Items/Contracts/ItemActionPhase.cs.uid

@@ -0,0 +1 @@
+uid://c9w5d2n8q4m1h

src/Features/Items/Contracts/ItemActionResult.cs

@@ -0,0 +1,10 @@
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemActionResult(ItemActionStatus Status, string Message = "")
+{
+    public bool Success => Status == ItemActionStatus.Success;
+
+    public static ItemActionResult Ok() => new(ItemActionStatus.Success);
+
+    public static ItemActionResult Fail(ItemActionStatus status, string message) => new(status, message);
+}

src/Features/Items/Contracts/ItemActionResult.cs.uid

@@ -0,0 +1 @@
+uid://a8m4p1x7d3q6k

src/Features/Items/Contracts/ItemActionStatus.cs

@@ -0,0 +1,12 @@
+namespace Game.Features.Items.Contracts;
+
+public enum ItemActionStatus
+{
+    Success,
+    ItemNotFound,
+    HandOccupied,
+    HandEmpty,
+    UnsupportedAction,
+    PresentationFailed,
+    UnknownDefinition
+}

src/Features/Items/Contracts/ItemActionStatus.cs.uid

@@ -0,0 +1 @@
+uid://f1r6y3b9k5v2m

src/Features/Items/Contracts/ItemDefinition.cs

@@ -0,0 +1,7 @@
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemDefinition(
+    ItemDefinitionId Id,
+    string DisplayName,
+    HandRequirement HandRequirement
+);

src/Features/Items/Contracts/ItemDefinition.cs.uid

@@ -0,0 +1 @@
+uid://e3v8k4r1m7x2p

src/Features/Items/Contracts/ItemDefinitionId.cs

@@ -0,0 +1,6 @@
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemDefinitionId(string Value)
+{
+    public override string ToString() => Value;
+}

src/Features/Items/Contracts/ItemDefinitionId.cs.uid

@@ -0,0 +1 @@
+uid://b7q2n9c5w1m6y

src/Features/Items/Contracts/ItemInfo.cs

@@ -0,0 +1,8 @@
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemInfo(
+    ItemInstanceId Id,
+    ItemDefinitionId DefinitionId,
+    string DisplayName,
+    HandRequirement HandRequirement
+);

src/Features/Items/Contracts/ItemInfo.cs.uid

@@ -0,0 +1 @@
+uid://e1r5j8w3n6c9h

src/Features/Items/Contracts/ItemInstanceId.cs

@@ -0,0 +1,10 @@
+using Game.Shared.Domain;
+
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemInstanceId(InstanceId Value)
+{
+    public static ItemInstanceId From(InstanceId value) => new(value);
+
+    public override string ToString() => Value.ToString();
+}

src/Features/Items/Contracts/ItemInstanceId.cs.uid

@@ -0,0 +1 @@
+uid://b6x2f9m4t7k3q

src/Features/Items/Contracts/ItemUseRequest.cs

@@ -0,0 +1,11 @@
+using Game.Features.Interactions.Contracts;
+using Game.Features.Players.Contracts;
+
+namespace Game.Features.Items.Contracts;
+
+public readonly record struct ItemUseRequest(
+    PlayerId PlayerId,
+    Hand Hand,
+    ItemActionPhase Phase,
+    InteractionTargetId? TargetId = null
+);

src/Features/Items/Contracts/ItemUseRequest.cs.uid

@@ -0,0 +1 @@
+uid://d6k2v8m5r1c9n

src/Features/Items/Domain/Flashlight/FlashlightItemInstance.cs

@@ -0,0 +1,19 @@
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Items.Domain.Flashlight;
+
+public sealed class FlashlightItemInstance(ItemInfo info) : IItemInstance
+{
+    public ItemInfo Info { get; } = info;
+    public bool IsOn { get; private set; }
+
+    public ItemActionResult Use(ItemUseRequest request)
+    {
+        if (request.Phase == ItemActionPhase.Started)
+        {
+            IsOn = !IsOn;
+        }
+
+        return ItemActionResult.Ok();
+    }
+}

src/Features/Items/Domain/Flashlight/FlashlightItemInstance.cs.uid

@@ -0,0 +1 @@
+uid://b8r2n5q9w4m1y

src/Features/Items/Domain/HandsInventory.cs

@@ -0,0 +1,83 @@
+using System;
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Items.Domain;
+
+public sealed class HandsInventory
+{
+    private ItemInstanceId? _leftHand;
+    private ItemInstanceId? _rightHand;
+
+    public bool IsFree(Hand hand) => Get(hand) is null;
+
+    public ItemInstanceId? Get(Hand hand) => hand switch
+    {
+        Hand.Left => _leftHand,
+        Hand.Right => _rightHand,
+        _ => throw new ArgumentOutOfRangeException(nameof(hand), hand, null)
+    };
+
+    public bool TryHold(ItemInstanceId itemId, HandRequirement requirement, Hand hand)
+    {
+        if (_leftHand == itemId || _rightHand == itemId)
+        {
+            return false;
+        }
+
+        if (requirement == HandRequirement.Both)
+        {
+            if (_leftHand is not null || _rightHand is not null)
+            {
+                return false;
+            }
+
+            _leftHand = itemId;
+            _rightHand = itemId;
+            return true;
+        }
+
+        if (!IsFree(hand))
+        {
+            return false;
+        }
+
+        Set(hand, itemId);
+        return true;
+    }
+
+    public ItemInstanceId? Release(Hand hand)
+    {
+        ItemInstanceId? itemId = Get(hand);
+        if (itemId is null)
+        {
+            return null;
+        }
+
+        if (_leftHand == itemId)
+        {
+            _leftHand = null;
+        }
+
+        if (_rightHand == itemId)
+        {
+            _rightHand = null;
+        }
+
+        return itemId;
+    }
+
+    private void Set(Hand hand, ItemInstanceId itemId)
+    {
+        switch (hand)
+        {
+            case Hand.Left:
+                _leftHand = itemId;
+                break;
+            case Hand.Right:
+                _rightHand = itemId;
+                break;
+            default:
+                throw new ArgumentOutOfRangeException(nameof(hand), hand, null);
+        }
+    }
+}

src/Features/Items/Domain/HandsInventory.cs.uid

@@ -0,0 +1 @@
+uid://d5w1n8c4q7m2y

src/Features/Items/Domain/PassiveItemInstance.cs

@@ -0,0 +1,13 @@
+using Game.Features.Items.Contracts;
+
+namespace Game.Features.Items.Domain;
+
+public sealed class PassiveItemInstance(ItemInfo info) : IItemInstance
+{
+    public ItemInfo Info { get; } = info;
+
+    public ItemActionResult Use(ItemUseRequest request) => ItemActionResult.Fail(
+        ItemActionStatus.UnsupportedAction,
+        $"Item {Info.DefinitionId} cannot be used directly."
+    );
+}

src/Features/Items/Domain/PassiveItemInstance.cs.uid

@@ -0,0 +1 @@
+uid://d9p4x1m7v3k6c

src/Features/Items/Godot/Flashlight/FlashlightHeldView.tscn

@@ -0,0 +1,26 @@
+[gd_scene load_steps=3 format=3 uid="uid://dy6p2w9m4c8kr"]
+
+[sub_resource type="StandardMaterial3D" id="Material_flashlight"]
+albedo_color = Color(0.08, 0.09, 0.1, 1)
+metallic = 0.65
+roughness = 0.3
+
+[sub_resource type="CylinderMesh" id="Mesh_flashlight"]
+material = SubResource("Material_flashlight")
+top_radius = 0.055
+bottom_radius = 0.07
+height = 0.32
+radial_segments = 12
+
+[node name="FlashlightHeldView" type="Node3D"]
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.371139e-08, -1, 0, 1, -4.371139e-08, 0, 0, -0.08)
+mesh = SubResource("Mesh_flashlight")
+
+[node name="SpotLight3D" type="SpotLight3D" parent="."]
+visible = false
+light_energy = 3.0
+shadow_enabled = true
+spot_range = 14.0
+spot_angle = 24.0

src/Features/Items/Godot/Flashlight/FlashlightItem.tscn

@@ -0,0 +1,47 @@
+[gd_scene load_steps=6 format=3 uid="uid://cv8m3q1y6r4nf"]
+
+[ext_resource type="Script" uid="uid://a5q9y2d7m4v8p" path="res://src/Features/Items/Godot/Flashlight/FlashlightItemController.cs" id="1_script"]
+[ext_resource type="PackedScene" uid="uid://dy6p2w9m4c8kr" path="res://src/Features/Items/Godot/Flashlight/FlashlightHeldView.tscn" id="2_held"]
+
+[sub_resource type="StandardMaterial3D" id="Material_flashlight"]
+albedo_color = Color(0.08, 0.09, 0.1, 1)
+metallic = 0.65
+roughness = 0.3
+
+[sub_resource type="CylinderMesh" id="Mesh_flashlight"]
+material = SubResource("Material_flashlight")
+top_radius = 0.055
+bottom_radius = 0.07
+height = 0.32
+radial_segments = 12
+
+[sub_resource type="CapsuleShape3D" id="Shape_flashlight"]
+radius = 0.07
+height = 0.32
+
+[node name="FlashlightItem" type="RigidBody3D" node_paths=PackedStringArray("Collision", "WorldVisual", "WorldLight")]
+mass = 0.4
+script = ExtResource("1_script")
+DefinitionId = "flashlight"
+DisplayName = "latarkę"
+Collision = NodePath("CollisionShape3D")
+WorldVisual = NodePath("WorldVisual")
+HeldViewScene = ExtResource("2_held")
+WorldLight = NodePath("WorldVisual/SpotLight3D")
+
+[node name="CollisionShape3D" type="CollisionShape3D" parent="."]
+transform = Transform3D(1, 0, 0, 0, -4.371139e-08, -1, 0, 1, -4.371139e-08, 0, 0, 0)
+shape = SubResource("Shape_flashlight")
+
+[node name="WorldVisual" type="Node3D" parent="."]
+
+[node name="MeshInstance3D" type="MeshInstance3D" parent="WorldVisual"]
+transform = Transform3D(1, 0, 0, 0, -4.371139e-08, -1, 0, 1, -4.371139e-08, 0, 0, 0)
+mesh = SubResource("Mesh_flashlight")
+
+[node name="SpotLight3D" type="SpotLight3D" parent="WorldVisual"]
+visible = false
+light_energy = 3.0
+shadow_enabled = true
+spot_range = 14.0
+spot_angle = 24.0

src/Features/Items/Godot/Flashlight/FlashlightItemController.cs

@@ -0,0 +1,39 @@
+using Game.Features.Items.Contracts;
+using Game.Features.Items.Domain.Flashlight;
+using Game.Features.Items.Godot;
+using Godot;
+
+namespace Game.Features.Items.Godot.Flashlight;
+
+public partial class FlashlightItemController : ItemController
+{
+    [Export] public SpotLight3D WorldLight;
+
+    private SpotLight3D _heldLight;
+    protected override IItemInstance CreateItemInstance(ItemInfo itemInfo) => new FlashlightItemInstance(itemInfo);
+
+    protected override void OnHeldViewCreated(Node3D heldView)
+    {
+        _heldLight = heldView.GetNodeOrNull<SpotLight3D>("SpotLight3D");
+    }
+
+    protected override void OnHeldViewRemoving(Node3D heldView)
+    {
+        _heldLight = null;
+    }
+
+    protected override void OnPresentationChanged(IItemInstance item)
+    {
+        bool isOn = item is FlashlightItemInstance flashlight && flashlight.IsOn;
+
+        if (WorldLight is not null)
+        {
+            WorldLight.Visible = isOn && !IsHeld;
+        }
+
+        if (_heldLight is not null)
+        {
+            _heldLight.Visible = isOn;
+        }
+    }
+}

src/Features/Items/Godot/Flashlight/FlashlightItemController.cs.uid

@@ -0,0 +1 @@
+uid://a5q9y2d7m4v8p

src/Features/Items/Godot/HeldItemPresenter.cs

@@ -0,0 +1,42 @@
+using Game.Features.Items.Contracts;
+using Godot;
+
+namespace Game.Features.Items.Godot;
+
+public sealed class HeldItemPresenter(
+    ItemControllerRegistryController itemWorld,
+    Node3D leftHandAnchor,
+    Node3D rightHandAnchor
+) : IHeldItemPresenter
+{
+    public bool TryShowHeld(IItemInstance item, Hand hand)
+    {
+        if (!itemWorld.TryGetController(item.Info.Id, out ItemController controller))
+        {
+            return false;
+        }
+
+        Node3D anchor = hand == Hand.Left ? leftHandAnchor : rightHandAnchor;
+        controller.SetHeld(anchor, item);
+        return true;
+    }
+
+    public bool TryShowDropped(IItemInstance item, Vector3 worldPosition)
+    {
+        if (!itemWorld.TryGetController(item.Info.Id, out ItemController controller))
+        {
+            return false;
+        }
+
+        controller.SetDropped(worldPosition, item);
+        return true;
+    }
+
+    public void Refresh(IItemInstance item)
+    {
+        if (itemWorld.TryGetController(item.Info.Id, out ItemController controller))
+        {
+            controller.ApplyState(item);
+        }
+    }
+}

src/Features/Items/Godot/HeldItemPresenter.cs.uid

@@ -0,0 +1 @@
+uid://e5m2r8q1v7k4n

src/Features/Items/Godot/ItemController.cs

@@ -0,0 +1,136 @@
+using System;
+using Game.Features.Items.Contracts;
+using Game.Features.Items.Domain;
+using Game.Godot.Extensions;
+using Godot;
+
+namespace Game.Features.Items.Godot;
+
+public partial class ItemController : RigidBody3D, IPickupTarget
+{
+    public const string ItemGroup = "world_items";
+
+    [Export]
+    public string InstanceKey;
+
+    [Export]
+    public string DefinitionId = "item";
+
+    [Export]
+    public string DisplayName = "Item";
+
+    [Export]
+    public HandRequirement HandRequirement = HandRequirement.One;
+
+    [Export]
+    public CollisionShape3D Collision;
+
+    [Export]
+    public Node3D WorldVisual;
+
+    [Export]
+    public PackedScene HeldViewScene;
+
+    protected Node3D HeldView { get; private set; }
+    protected bool IsHeld => HeldView is not null;
+
+    public ItemInfo ItemInfo { get; private set; }
+    public ItemDefinition Definition { get; private set; }
+    public IItemInstance Item { get; private set; }
+
+    private ItemControllerRegistryController _registry;
+
+    public override void _Ready()
+    {
+        this.AssertRequiredExports();
+
+        if (string.IsNullOrWhiteSpace(DefinitionId))
+        {
+            throw new InvalidOperationException($"{Name}: item definition id cannot be empty.");
+        }
+
+        if (HeldViewScene is null)
+        {
+            throw new InvalidOperationException($"{Name}: held view scene is not assigned.");
+        }
+
+        Definition = new ItemDefinition(
+            new ItemDefinitionId(DefinitionId),
+            DisplayName,
+            HandRequirement
+        );
+        ItemInfo = new ItemInfo(
+            ItemInstanceId.From(this.GetStableInstanceIdFrom(InstanceKey)),
+            Definition.Id,
+            Definition.DisplayName,
+            Definition.HandRequirement
+        );
+        Item = CreateItemInstance(ItemInfo);
+        AddToGroup(ItemGroup);
+        ApplyState(Item);
+    }
+
+    public override void _ExitTree()
+    {
+        _registry?.Unregister(ItemInfo.Id);
+    }
+
+    public void RegisterWith(ItemControllerRegistryController registry)
+    {
+        _registry = registry;
+    }
+
+    public void SetHeld(Node3D anchor, IItemInstance item)
+    {
+        if (IsHeld)
+        {
+            return;
+        }
+
+        Freeze = true;
+        Sleeping = true;
+        LinearVelocity = Vector3.Zero;
+        AngularVelocity = Vector3.Zero;
+        Collision.SetDeferred(CollisionShape3D.PropertyName.Disabled, true);
+        WorldVisual.Visible = false;
+
+        HeldView = HeldViewScene.Instantiate<Node3D>();
+        anchor.AddChild(HeldView);
+        HeldView.Transform = Transform3D.Identity;
+        OnHeldViewCreated(HeldView);
+        ApplyState(item);
+    }
+
+    public void SetDropped(Vector3 worldPosition, IItemInstance item)
+    {
+        if (HeldView is not null)
+        {
+            OnHeldViewRemoving(HeldView);
+            HeldView.QueueFree();
+            HeldView = null;
+        }
+
+        GlobalPosition = worldPosition;
+        LinearVelocity = Vector3.Zero;
+        AngularVelocity = Vector3.Zero;
+        WorldVisual.Visible = true;
+        Collision.SetDeferred(CollisionShape3D.PropertyName.Disabled, false);
+        Freeze = false;
+        Sleeping = false;
+        ApplyState(item);
+    }
+
+    public void ApplyState(IItemInstance item)
+    {
+        OnPresentationChanged(item);
+    }
+
+    protected virtual IItemInstance CreateItemInstance(ItemInfo itemInfo) =>
+        new PassiveItemInstance(itemInfo);
+
+    protected virtual void OnHeldViewCreated(Node3D heldView) { }
+
+    protected virtual void OnHeldViewRemoving(Node3D heldView) { }
+
+    protected virtual void OnPresentationChanged(IItemInstance item) { }
+}

src/Features/Items/Godot/ItemController.cs.uid

@@ -0,0 +1 @@
+uid://d1x7m4q9v2c6k

src/Features/Items/Godot/ItemControllerRegistryController.cs

@@ -0,0 +1,58 @@
+using System;
+using System.Collections.Generic;
+using Game.Features.Items.Contracts;
+using Godot;
+
+namespace Game.Features.Items.Godot;
+
+public partial class ItemControllerRegistryController : Node
+{
+    private IItemInstanceRegistry _registry;
+    private readonly Dictionary<ItemInstanceId, ItemController> _items = [];
+
+    public IReadOnlyCollection<ItemController> Items => _items.Values;
+
+    public void UseRegistry(IItemInstanceRegistry registry)
+    {
+        _registry = registry;
+    }
+
+    public void RegisterSceneItems()
+    {
+        foreach (Node node in GetTree().GetNodesInGroup(ItemController.ItemGroup))
+        {
+            if (node is ItemController item)
+            {
+                Register(item);
+            }
+        }
+    }
+
+    public void Register(ItemController item)
+    {
+        if (_items.TryGetValue(item.ItemInfo.Id, out ItemController existing))
+        {
+            if (ReferenceEquals(existing, item))
+            {
+                return;
+            }
+
+            throw new InvalidOperationException($"Duplicate item instance id: {item.ItemInfo.Id}.");
+        }
+
+        _items.Add(item.ItemInfo.Id, item);
+        _registry.Register(item.ItemInfo.Id, item.Item);
+        item.RegisterWith(this);
+    }
+
+    public void Unregister(ItemInstanceId itemId)
+    {
+        _items.Remove(itemId);
+        _registry.Unregister(itemId);
+    }
+
+    public bool TryGetController(ItemInstanceId itemId, out ItemController controller)
+    {
+        return _items.TryGetValue(itemId, out controller);
+    }
+}

src/Features/Items/Godot/ItemControllerRegistryController.cs.uid

@@ -0,0 +1 @@
+uid://f8n3b6w1k5r9m