Interaction manager and hud

Scripts/Components/FSM/3DPlayer/SelectorController.cs

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+using System.Collections.Generic;
+using Cirno.Scripts.Interactables;
+using Godot;
+
+namespace Cirno.Scripts.Components.FSM._3DPlayer;
+
+public partial class SelectorController : Node
+{
+    [Signal] public delegate void ShowSelectorEventHandler();
+    [Signal] public delegate void HideSelectorEventHandler();
+    [Signal] public delegate void ChangePositionEventHandler(Vector2 position);
+    
+    private Interactable _lastInteractable;
+
+    private List<IInteractable> _interactables = [];
+
+    private int _selectedInteractable;
+
+    private int SelectedInteractableIndex
+    {
+        get => _selectedInteractable;
+        set
+        {
+            if (value >= _interactables.Count)
+            {
+                _selectedInteractable = 0;
+            }
+
+            if (value < 0)
+            {
+                _selectedInteractable = _interactables.Count - 1;
+            }
+        }
+    }
+    
+    public IInteractable SelectedInteractable
+    {
+        get =>
+            _interactables.Count > 0
+                ? SelectedInteractableIndex >= _interactables.Count
+                    ? _interactables[^1]
+                    : _interactables[SelectedInteractableIndex]
+                : null;
+        set
+        {
+            // Passing null deselects the interactable
+            if (value == null)
+            {
+                _selectedInteractable = -1;
+                NotifyChanged(null);
+                return;
+            }
+
+            // If it's already in the list, set the current one to it, otherwise add it
+            if (!_interactables.Contains(value))
+            {
+                AddInteractable(value);
+            }
+
+            SelectedInteractableIndex = _interactables.IndexOf(value);
+            NotifyChanged(value);
+        }
+    }
+    
+    public void SelectNext()
+    {
+        SelectedInteractableIndex += 1;
+        // _selectedInteractable += 1;
+        // if (_selectedInteractable >= _interactables.Count)
+        // {
+        //     _selectedInteractable = 0;
+        // }
+
+        if (_interactables.Count > 0)
+        {
+            SelectedInteractable = _interactables[_selectedInteractable];
+        }
+        else
+        {
+            _selectedInteractable = -1;
+        }
+
+        UpdatePosition();
+    }
+    
+    public void AddInteractable(IInteractable interactable)
+    {
+        if (!_interactables.Contains(interactable))
+        {
+            _interactables.Add(interactable);
+
+            if (_interactables.Count == 1)
+            {
+                _selectedInteractable = 0;
+            }
+        }
+
+        UpdatePosition();
+    }
+
+    public void RemoveInteractable(IInteractable interactable)
+    {
+        if (_interactables.Contains(interactable))
+        {
+            _interactables.Remove(interactable);
+        }
+
+        UpdatePosition();
+    }
+
+    public void Deselect()
+    {
+        _selectedInteractable = -1;
+        EmitSignalHideSelector();
+    }
+
+    public void UpdatePosition()
+    {
+        if (SelectedInteractable != null)
+        {
+            EmitSignalChangePosition(SelectedInteractable.GetGlobalPosition());
+            EmitSignalShowSelector();
+        }
+        else
+        {
+            EmitSignalHideSelector();
+        }
+    }
+    
+    private void NotifyChanged(IInteractable interactable)
+    {
+        //EmitSignal(nameof(SelectedItemInteractableChanged), interactable);
+    }
+
+    public void Hide()
+    {
+        EmitSignalHideSelector();
+    }
+}