Implemented Save and Load functionality

project.godot

@@ -317,6 +317,11 @@ DebugEntities={
 "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":66,"key_label":0,"unicode":98,"location":0,"echo":false,"script":null)
 ]
 }
+SaveGame={
+"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":4194336,"key_label":0,"unicode":0,"location":0,"echo":false,"script":null)
+]
+}
 
 [internationalization]
 

scripts/CSharp/GameEntity/Entities/Entity.cs

@@ -14,13 +14,13 @@ public class Entity
         id = new Random().NextInt64();
     }
 
-    protected virtual void SaveEntity(JObject json)
+    public virtual void SaveEntity(JObject json)
     {
         json["id"] = id;
         json["type"] = EntityType;
     }
 
-    protected virtual void LoadEntity(JObject json)
+    public virtual void LoadEntity(JObject json)
     {
         id = json.GetLongValue("id");
     }

scripts/CSharp/GameEntity/Entities/LoadedScenesEntity.cs

@@ -1,13 +1,32 @@
+using System;
 using System.Collections.Generic;
+using System.Linq;
+using System.Transactions;
+using Newtonsoft.Json.Linq;
 
 namespace Babushka.scripts.CSharp.GameEntity.Entities;
 
 public class LoadedScenesEntity : Entity
 {
     private HashSet<string> _loadedScenes = new();
-    public override string EntityType => "LoadedScenesEntity";
+    public override string EntityType => OWN_TYPE_NAME;
+    public const string OWN_TYPE_NAME = "LoadedScenesEntity";
     
     public void AddScene(string sceneName) => _loadedScenes.Add(sceneName);
     
     public bool WasSceneLoaded(string sceneName) => _loadedScenes.Contains(sceneName);
+
+    public override void SaveEntity(JObject json)
+    {
+        base.SaveEntity(json);
+        json["scenes"] = new JArray(_loadedScenes);
+    }
+
+    public override void LoadEntity(JObject json)
+    {
+        base.LoadEntity(json);
+        JArray array = (JArray?) json["scenes"] ?? throw new Exception("No scenes found in LoadedScenesEntity.");
+        
+        _loadedScenes = array.ToObject<HashSet<string>>()!;
+    }
 }

scripts/CSharp/GameEntity/Entities/PositionalEntity.cs

@@ -6,22 +6,21 @@ namespace Babushka.scripts.CSharp.GameEntity.Entities;
 
 public abstract class PositionalEntity : Entity
 {
-    private Node2D _positionalNodeRef;
     public Vector2 position;
     public string sceneName = "none";
 
-    protected override void SaveEntity(JObject json)
+    public override void SaveEntity(JObject json)
     {
         base.SaveEntity(json);
-        json["posx"] = _positionalNodeRef.Position.X;
-        json["posy"] = _positionalNodeRef.Position.Y;
+        json["posx"] = position.X;
+        json["posy"] = position.Y;
         json["scene"] = sceneName;
     }
 
-    protected override void LoadEntity(JObject json)
+    public override void LoadEntity(JObject json)
     {
         base.LoadEntity(json);
-        _positionalNodeRef.Position = new Vector2(
+        position = new Vector2(
             json.GetFloatValue("posx"),
             json.GetFloatValue("posy"));
         sceneName = json.GetStringValue("scene");

scripts/CSharp/GameEntity/LoadSave/EntityLoadSaveUtil.cs

@@ -8,7 +8,7 @@ public static class EntityLoadSaveUtil
     {
         var token = json[key];
         if (token == null) throw new MalformedJsonException(json, key, "does not exist");
-        if (!token.HasValues) throw new MalformedJsonException(json, key, "has no value");
+        //if (!token.HasValues) throw new MalformedJsonException(json, key, "has no value");
         if (token.Type != type) throw new MalformedJsonException(json, key, $"is not of type {type}");
     }
 

scripts/CSharp/GameEntity/Management/EntityManager.cs

@@ -1,6 +1,9 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
+using Babushka.scripts.CSharp.GameEntity.Entities;
 using Godot;
+using Newtonsoft.Json.Linq;
 using Entity = Babushka.scripts.CSharp.GameEntity.Entities.Entity;
 using PositionalEntity = Babushka.scripts.CSharp.GameEntity.Entities.PositionalEntity;
 
@@ -15,6 +18,7 @@ public partial class EntityManager : Node
     public static EntityManager Instance;
     
     [Export] private EntityNodeCreator _nodeCreator = null!;
+    [Export] private string saveDirectory = "user://save_data/";
     
     private EntitySceneContainer? _currentEntitySceneContainer;
     private readonly List<Entity> _allEntities = new();
@@ -27,6 +31,7 @@ public partial class EntityManager : Node
     public override void _EnterTree()
     {
         Instance = this;
+        Load();
     }
 
     public override void _Input(InputEvent @event)
@@ -40,6 +45,58 @@ public partial class EntityManager : Node
                 GD.Print(entity.EntityType + " " + entity.id);
             }
         }
+        
+        if(@event.IsActionPressed("SaveGame")) Save();
+    }
+
+    public void Save()
+    {
+        JArray array = new JArray();
+        foreach (var entity in AllEntities)
+        {
+            JObject saveData = new JObject();
+            entity.SaveEntity(saveData);
+            array.Add(saveData);
+        }
+        
+        using var SaveFile = FileAccess.Open(saveDirectory + "save.json", FileAccess.ModeFlags.Write);
+        SaveFile.StoreString(array.ToString());
+    }
+    
+    public void Load()
+    {
+        using var saveFile = FileAccess.Open(saveDirectory + "save.json", FileAccess.ModeFlags.Read);
+        if (saveFile == null) return;
+        
+        JArray array = JArray.Parse(saveFile.GetAsText());
+
+        foreach (var token in array)
+        {
+            var jobj = (JObject)token;
+
+            if (jobj == null) continue;
+
+            if (jobj.TryGetValue("type", out var entityType))
+            {
+                string entityTypeString = (string) entityType!;
+                Entity entity = InitializeEntity(entityTypeString);
+                entity.LoadEntity(jobj);
+                AddEntity(entity);
+                
+            }
+        }
+    }
+
+    private Entity InitializeEntity(string type)
+    {
+        Entity entity = type switch
+        {
+            TrashEntity.OWN_TYPE_NAME => new TrashEntity(),
+            LoadedScenesEntity.OWN_TYPE_NAME => new LoadedScenesEntity(),
+            _ => throw new Exception($"Trying to load unknown entity type: {type}")
+        };
+
+        return entity;
     }
     
     #region ENTITY MANAGEMENT

scripts/CSharp/GameEntity/Management/EntitySceneContainer.cs

@@ -16,14 +16,20 @@ public partial class EntitySceneContainer : Node2D
 
     public override void _ExitTree()
     {
+        EntityManager.Instance.Save();
         EntityManager.Instance.UnsetSceneContainer();
-        var loadedScenesEntity = EntityManager.Instance.GetUniqueEntity<LoadedScenesEntity>();
-        loadedScenesEntity.AddScene(sceneName);
     }
 
     public override void _Ready()
     {
         AddAllEntities();
+        CallDeferred(nameof(RegisterWithScenesEntity));
+    }
+
+    private void RegisterWithScenesEntity()
+    {
+        var loadedScenesEntity = EntityManager.Instance.GetUniqueEntity<LoadedScenesEntity>();
+        loadedScenesEntity.AddScene(sceneName);
     }
 
     public void AddAllEntities()