Game state manager and restored inventory

Scripts/Utils/GameStateManager.cs

@@ -0,0 +1,90 @@
+using Godot;
+
+namespace Cirno.Scripts.Utils;
+
+public partial class GameStateManager : Node
+{
+    public static GameStateManager Instance { get; private set; }
+    public GameState GameState { get; private set; }
+    
+    [Signal] public delegate void GameStateChangeEventHandler(GameState state);
+
+    public void Init(GameState initialState)
+    {
+        Instance = this;
+        GameState = initialState;
+    }
+    
+    public void Pause()
+    {
+        if (GameState == GameState.Playing)
+        {
+            ChangeState(GameState.Paused);
+        }
+    }
+
+    public void Unpause()
+    {
+        if (GameState == GameState.Paused)
+        {
+            CallDeferred(MethodName.ChangeState, (int)GameState.Playing);
+            //ChangeState(GameState.Playing);
+        }
+    }
+
+    public static void SetState(GameState state)
+    {
+        GameStateManager.Instance.ChangeState(state);
+    }
+    
+    public void ChangeState(GameState state)
+    {
+        if (state == GameState) return;
+        GameState = state;
+        EmitSignal(SignalName.GameStateChange, (int)state);
+        GD.Print($"Game state changed to {state}");
+
+        switch (state)
+        {
+            case GameState.Paused:
+            case GameState.Dialogue:
+            case GameState.Shop:
+            case GameState.Inventory:
+                GlobalState.Instance.ChangeCursor(true);
+
+                GetTree().SetPause(true);
+                //Input.MouseMode = Input.MouseModeEnum.Visible;
+                break;
+            case GameState.Playing:
+            case GameState.Controlling:
+                //Input.MouseMode = Input.MouseModeEnum.Confined;
+                GlobalState.Instance.ChangeCursor(false);
+                DelayedUnpause();
+                //CallDeferred(MethodName.DelayedUnpause);
+                //GetTree().SetPause(false);
+                break;
+            case GameState.Menu:
+                GlobalState.Instance.ChangeCursor(true);
+                //Input.MouseMode = Input.MouseModeEnum.Visible;
+                DelayedUnpause();
+                //CallDeferred(MethodName.DelayedUnpause);
+                //GetTree().SetPause(false);
+                break;
+        }
+    }
+    
+    private void DelayedUnpause()
+    {
+        GetTree().SetPause(false);
+    }
+    
+    public override void _Process(double delta)
+    {
+        if (GameState is GameState.Paused && GlobalInputManager.IsPauseJustPressed())
+        {
+            Unpause();
+            return;
+        }
+    }
+    
+}