From 341173c53f454e2301dfcc946d4ed213fbf696d2 Mon Sep 17 00:00:00 2001
From: Gabriel Kaszewski <gabrielkaszewski@gmail.com>
Date: Wed, 29 Oct 2025 02:27:41 +0100
Subject: [PATCH] Add healing effects and systems with event handling

---
 GameCore/Combat/Effects/HealEffect.cs | 14 ++++++++
 GameCore/Combat/HealingSystem.cs      | 46 +++++++++++++++++++++++++++
 GameCore/Events/EntityHealedEvent.cs  | 11 +++++++
 GameCore/Events/HealDealtEvent.cs     | 10 ++++++
 4 files changed, 81 insertions(+)
 create mode 100644 GameCore/Combat/Effects/HealEffect.cs
 create mode 100644 GameCore/Combat/HealingSystem.cs
 create mode 100644 GameCore/Events/EntityHealedEvent.cs
 create mode 100644 GameCore/Events/HealDealtEvent.cs

diff --git a/GameCore/Combat/Effects/HealEffect.cs b/GameCore/Combat/Effects/HealEffect.cs
new file mode 100644
index 0000000..4105491
--- /dev/null
+++ b/GameCore/Combat/Effects/HealEffect.cs
@@ -0,0 +1,14 @@
+using GameCore.Combat.Interfaces;
+using GameCore.Events;
+
+namespace GameCore.Combat.Effects;
+
+public class HealEffect(float amount) : IEffect
+{
+    public void Execute(EffectContext context)
+    {
+        if (context.Target == null) return;
+
+        context.World.PublishEvent(new HealDealtEvent(context.Target.Value, amount));
+    }
+}
\ No newline at end of file
diff --git a/GameCore/Combat/HealingSystem.cs b/GameCore/Combat/HealingSystem.cs
new file mode 100644
index 0000000..1b3bf08
--- /dev/null
+++ b/GameCore/Combat/HealingSystem.cs
@@ -0,0 +1,46 @@
+using GameCore.Attributes;
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+using GameCore.Events;
+using Attribute = GameCore.Attributes.Attribute;
+
+namespace GameCore.Combat;
+
+public class HealingSystem : ISystem
+{
+    private readonly World _world;
+
+    public HealingSystem(World world)
+    {
+        _world = world;
+        _world.Subscribe<HealDealtEvent>(OnHealDealt);
+    }
+
+    public void Update(World world, float deltaTime)
+    {
+    }
+
+    private void OnHealDealt(HealDealtEvent e)
+    {
+        var attributes = _world.GetComponent<AttributeComponent>(e.Target);
+        if (attributes == null) return;
+
+        var currentHealth = attributes.GetValue(Attribute.Health);
+        var maxHealth = attributes.GetValue(Attribute.MaxHealth);
+
+        if (currentHealth >= maxHealth) return;
+
+        var amountToHeal = e.Amount;
+        var newHealth = currentHealth + amountToHeal;
+
+        if (newHealth > maxHealth)
+        {
+            amountToHeal = maxHealth - newHealth;
+            newHealth = maxHealth;
+        }
+
+        attributes.ModifyValue(Attribute.Health, amountToHeal);
+
+        _world.PublishEvent(new EntityHealedEvent(e.Target, newHealth, amountToHeal));
+    }
+}
\ No newline at end of file
diff --git a/GameCore/Events/EntityHealedEvent.cs b/GameCore/Events/EntityHealedEvent.cs
new file mode 100644
index 0000000..63ed88c
--- /dev/null
+++ b/GameCore/Events/EntityHealedEvent.cs
@@ -0,0 +1,11 @@
+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct EntityHealedEvent(Entity target, float newHealth, float amountHealed) : IEvent
+{
+    public readonly Entity Target = target;
+    public readonly float NewHealth = newHealth;
+    public readonly float AmountHealed = amountHealed;
+}
\ No newline at end of file
diff --git a/GameCore/Events/HealDealtEvent.cs b/GameCore/Events/HealDealtEvent.cs
new file mode 100644
index 0000000..8152488
--- /dev/null
+++ b/GameCore/Events/HealDealtEvent.cs
@@ -0,0 +1,10 @@
+using GameCore.ECS;
+using GameCore.Events.Interfaces;
+
+namespace GameCore.Events;
+
+public readonly struct HealDealtEvent(Entity target, float amount) : IEvent
+{
+    public readonly Entity Target = target;
+    public readonly float Amount = amount;
+}
\ No newline at end of file