From 5fa7420c04b881a721e79e1ea93eef5b2ea3a685 Mon Sep 17 00:00:00 2001
From: Syntriax <Syntriax@gmail.com>
Date: Sun, 20 Apr 2025 00:43:24 +0300
Subject: [PATCH] feat: added entity converter

---
 .../Converters/EntityConverter.cs             | 28 +++++++++++++++
 .../Converters/EntityReference.cs             | 12 +++++++
 .../Converters/EntityReferenceConverter.cs    | 36 +++++++++++++++++++
 3 files changed, 76 insertions(+)
 create mode 100644 Engine.Serialization/Converters/EntityConverter.cs
 create mode 100644 Engine.Serialization/Converters/EntityReference.cs
 create mode 100644 Engine.Serialization/Converters/EntityReferenceConverter.cs

diff --git a/Engine.Serialization/Converters/EntityConverter.cs b/Engine.Serialization/Converters/EntityConverter.cs
new file mode 100644
index 0000000..4e54caf
--- /dev/null
+++ b/Engine.Serialization/Converters/EntityConverter.cs
@@ -0,0 +1,28 @@
+using Syntriax.Engine.Core;
+using Syntriax.Engine.Core.Factory;
+
+using YamlDotNet.Core;
+using YamlDotNet.Serialization;
+
+namespace Syntriax.Engine.Serialization;
+
+public class EntityConverter : IEngineTypeYamlConverter
+{
+    public bool Accepts(Type type) => typeof(IEntity).IsAssignableFrom(type);
+
+    public object? ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer)
+    {
+        EntityReference entityReference = (EntityReference)rootDeserializer(typeof(EntityReference))!;
+
+        IEntity entity = (IEntity)TypeFactory.Get(entityReference.TypeContainer.Type);
+
+        return entity;
+    }
+
+    public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
+    {
+        IEntity? entity = (IEntity)value!;
+
+        serializer(new EntityReference(entity), typeof(EntityReference));
+    }
+}
diff --git a/Engine.Serialization/Converters/EntityReference.cs b/Engine.Serialization/Converters/EntityReference.cs
new file mode 100644
index 0000000..97e85c2
--- /dev/null
+++ b/Engine.Serialization/Converters/EntityReference.cs
@@ -0,0 +1,12 @@
+using Syntriax.Engine.Core;
+
+namespace Syntriax.Engine.Serialization;
+
+public class EntityReference
+{
+    public string Id { get; set; } = string.Empty;
+    public TypeContainer TypeContainer { get; set; } = new();
+
+    public EntityReference() { }
+    public EntityReference(IEntity entity) { TypeContainer = new(entity); Id = entity.Id; }
+}
diff --git a/Engine.Serialization/Converters/EntityReferenceConverter.cs b/Engine.Serialization/Converters/EntityReferenceConverter.cs
new file mode 100644
index 0000000..406c674
--- /dev/null
+++ b/Engine.Serialization/Converters/EntityReferenceConverter.cs
@@ -0,0 +1,36 @@
+using YamlDotNet.Core;
+using YamlDotNet.Core.Events;
+using YamlDotNet.Serialization;
+
+namespace Syntriax.Engine.Serialization;
+
+public class EntityReferenceConverter : IEngineTypeYamlConverter
+{
+    public bool Accepts(Type type) => type == typeof(EntityReference);
+
+    public object? ReadYaml(IParser parser, Type type, ObjectDeserializer rootDeserializer)
+    {
+        parser.Consume<MappingStart>();
+
+        TypeContainer typeContainer = (TypeContainer)rootDeserializer(typeof(TypeContainer))!;
+
+        if (parser.Consume<Scalar>().Value.CompareTo(nameof(EntityReference.Id)) != 0)
+            throw new ArgumentException($"{nameof(EntityReference)} mapping must have an {nameof(EntityReference.Id)}");
+        string id = parser.Consume<Scalar>().Value;
+
+        parser.Consume<MappingEnd>();
+
+        return new EntityReference() { Id = id, TypeContainer = typeContainer };
+    }
+
+    public void WriteYaml(IEmitter emitter, object? value, Type type, ObjectSerializer serializer)
+    {
+        EntityReference? entityReference = (EntityReference)value!;
+
+        emitter.Emit(new MappingStart());
+        serializer(entityReference.TypeContainer, typeof(TypeContainer));
+        emitter.Emit(new Scalar(nameof(EntityReference.Id)));
+        emitter.Emit(new Scalar(entityReference.Id));
+        emitter.Emit(new MappingEnd());
+    }
+}