Added basic entity scripts

Babushka.csproj

@@ -8,4 +8,7 @@
     <Folder Include="prefabs\UI\Inventory\" />
     <Folder Include="scripts\CSharp\Low Code\Randomizer\" />
   </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+  </ItemGroup>
 </Project>

scripts/CSharp/GameEntity/Entities/Entity.cs

@@ -0,0 +1,23 @@
+using Babushka.scripts.CSharp.GameEntity.LoadSave;
+using Babushka.scripts.CSharp.GameEntity.Types;
+using Godot;
+using Newtonsoft.Json.Linq;
+
+namespace Babushka.scripts.CSharp.GameEntity.Entities;
+
+public partial class Entity : Node2D
+{
+    private long _id;
+    protected virtual EntityType Type => EntityType.None;
+
+    protected virtual void SaveEntity(JObject json)
+    {
+        json["id"] = _id;
+        json["type"] = (int)Type;
+    }
+
+    protected virtual void LoadEntity(JObject json)
+    {
+        _id = json.GetLongValue("id");
+    }
+}

scripts/CSharp/GameEntity/Entities/Entity.cs.uid

@@ -0,0 +1 @@
+uid://hnmpt23ovfgl

scripts/CSharp/GameEntity/Entities/PositionalEntity.cs

@@ -0,0 +1,27 @@
+using Babushka.scripts.CSharp.GameEntity.LoadSave;
+using Godot;
+using Newtonsoft.Json.Linq;
+
+namespace Babushka.scripts.CSharp.GameEntity.Entities;
+
+public partial class PositionalEntity : Entity
+{
+    public string sceneName = "none";
+
+    protected override void SaveEntity(JObject json)
+    {
+        base.SaveEntity(json);
+        json["posx"] = Position.X;
+        json["posy"] = Position.Y;
+        json["scene"] = sceneName;
+    }
+
+    protected override void LoadEntity(JObject json)
+    {
+        base.LoadEntity(json);
+        Position = new Vector2(
+            json.GetFloatValue("posx"),
+            json.GetFloatValue("posy"));
+        sceneName = json.GetStringValue("scene");
+    }
+}

scripts/CSharp/GameEntity/Entities/PositionalEntity.cs.uid

@@ -0,0 +1 @@
+uid://bs38dulqv7sop

scripts/CSharp/GameEntity/LoadSave/EntityLoadSaveUtil.cs

@@ -0,0 +1,32 @@
+using Newtonsoft.Json.Linq;
+
+namespace Babushka.scripts.CSharp.GameEntity.LoadSave;
+
+public static class EntityLoadSaveUtil
+{
+    private static void AssertTokenType(this JObject json, string key, JTokenType type)
+    {
+        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.Type != type) throw new MalformedJsonException(json, key, $"is not of type {type}");
+    }
+
+    public static long GetLongValue(this JObject json, string key)
+    {
+        AssertTokenType(json, key, JTokenType.Integer);
+        return json.Value<long>(key);
+    }
+    
+    public static float GetFloatValue(this JObject json, string key)
+    {
+        AssertTokenType(json, key, JTokenType.Float);
+        return json.Value<float>(key);
+    }
+    
+    public static string GetStringValue(this JObject json, string key)
+    {
+        AssertTokenType(json, key, JTokenType.String);
+        return json.Value<string>(key)!;
+    }
+}

scripts/CSharp/GameEntity/LoadSave/EntityLoadSaveUtil.cs.uid

@@ -0,0 +1 @@
+uid://ccu6p418viliu

scripts/CSharp/GameEntity/LoadSave/MalformedJsonException.cs

@@ -0,0 +1,12 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using Newtonsoft.Json.Linq;
+
+namespace Babushka.scripts.CSharp.GameEntity.LoadSave;
+
+public class MalformedJsonException(JObject actualJson, string key, string problem) : Exception
+{
+    public override string Message => $"JsonObject was malformed: {key} {problem}";
+    public override IDictionary Data => new Dictionary<string, JObject> { { "json", actualJson } };
+}

scripts/CSharp/GameEntity/LoadSave/MalformedJsonException.cs.uid

@@ -0,0 +1 @@
+uid://d1o066hh84ow

scripts/CSharp/GameEntity/Management/EntityManager.cs

@@ -0,0 +1,59 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Babushka.scripts.CSharp.GameEntity.Types;
+using Godot;
+using Entity = Babushka.scripts.CSharp.GameEntity.Entities.Entity;
+using PositionalEntity = Babushka.scripts.CSharp.GameEntity.Entities.PositionalEntity;
+
+namespace Babushka.scripts.CSharp.GameEntity.Management;
+
+public partial class EntityManager : Node
+{
+    [Export] private EntityNodeCreator _nodeCreator = null!;
+
+    private EntitySceneManager? _currentEntitySceneManager;
+
+
+    private readonly List<Entity> _allEntities = new();
+
+    public IEnumerable<Entity> AllEntities => _allEntities;
+
+    public IEnumerable<PositionalEntity> AllPositionalEntities => _allEntities.OfType<PositionalEntity>();
+
+    public T NewPositionalEntity<T>(EntityType type, Vector2 position, string? scene = null) where T : PositionalEntity
+    {
+        if (scene == null)
+        {
+            if (_currentEntitySceneManager == null)
+                throw new Exception("No current scene. Specify scene to spawn an entity");
+            
+            scene = _currentEntitySceneManager.sceneName;
+        }
+
+        var newEntity = _nodeCreator.Create<T>(type);
+        newEntity.Position = position;
+        newEntity.sceneName = scene;
+        _allEntities.Add(newEntity);
+
+        _currentEntitySceneManager.AddIfNeeded(newEntity);
+
+        return newEntity;
+    }
+
+    public void UnloadScene()
+    {
+        if (_currentEntitySceneManager == null) return;
+        _currentEntitySceneManager.RemoveAllEntities();
+        _currentEntitySceneManager = null;
+    }
+
+    public void LoadScene(EntitySceneManager sceneManager)
+    {
+        _currentEntitySceneManager = sceneManager;
+        foreach (var entity in AllPositionalEntities)
+        {
+            _currentEntitySceneManager.AddIfNeeded(entity);
+        }
+    }
+}

scripts/CSharp/GameEntity/Management/EntityManager.cs.uid

@@ -0,0 +1 @@
+uid://umop2b1m1qm8

scripts/CSharp/GameEntity/Management/EntityManagerUtil.cs

@@ -0,0 +1,14 @@
+using PositionalEntity = Babushka.scripts.CSharp.GameEntity.Entities.PositionalEntity;
+
+namespace Babushka.scripts.CSharp.GameEntity.Management;
+
+public static class EntityManagerUtil
+{
+    public static void AddIfNeeded(this EntitySceneManager? self, PositionalEntity entity)
+    {
+        if(self == null) return;
+        if(self.sceneName != entity.sceneName) return;
+
+        self.AddEntity(entity);
+    }
+}

scripts/CSharp/GameEntity/Management/EntityManagerUtil.cs.uid

@@ -0,0 +1 @@
+uid://dc3283h7sx4cl

scripts/CSharp/GameEntity/Management/EntityNodeCreator.cs

@@ -0,0 +1,16 @@
+using Babushka.scripts.CSharp.GameEntity.Types;
+using Godot;
+using Godot.Collections;
+using Entity = Babushka.scripts.CSharp.GameEntity.Entities.Entity;
+
+namespace Babushka.scripts.CSharp.GameEntity.Management;
+
+public partial class EntityNodeCreator : Node
+{
+    [Export] private Dictionary<EntityType, PackedScene> _entityPrefabs;
+
+    public T Create<T>(EntityType type) where T:Entity
+    {
+        return _entityPrefabs[type].Instantiate<T>();
+    }
+}

scripts/CSharp/GameEntity/Management/EntityNodeCreator.cs.uid

@@ -0,0 +1 @@
+uid://bogqp274y1pgr

scripts/CSharp/GameEntity/Management/EntitySceneManager.cs

@@ -0,0 +1,25 @@
+using Godot;
+using PositionalEntity = Babushka.scripts.CSharp.GameEntity.Entities.PositionalEntity;
+
+namespace Babushka.scripts.CSharp.GameEntity.Management;
+
+public partial class EntitySceneManager : Node2D
+{
+    [Export] public string sceneName = "none";
+
+    public void AddEntity(PositionalEntity entity)
+    {
+        AddChild(entity);
+    }
+
+    public void RemoveAllEntities()
+    {
+        foreach (var entity in GetChildren())
+        {
+            if (entity is PositionalEntity positionalEntity)
+            {
+                RemoveChild(entity);
+            }
+        }
+    }
+}

scripts/CSharp/GameEntity/Management/EntitySceneManager.cs.uid

@@ -0,0 +1 @@
+uid://ca1pg6k3gn47y

scripts/CSharp/GameEntity/Types/EntityType.cs

@@ -0,0 +1,7 @@
+namespace Babushka.scripts.CSharp.GameEntity.Types;
+
+public enum EntityType
+{
+    None = 0,
+    Yeli = 1,
+}

scripts/CSharp/GameEntity/Types/EntityType.cs.uid

@@ -0,0 +1 @@
+uid://cjygyr4lc224m