Add weapon acquisition and swapping systems with data handling

GameCore/Player/EquipmentSystem.cs

@@ -0,0 +1,42 @@
+using GameCore.Combat;
+using GameCore.Combat.Interfaces;
+using GameCore.ECS;
+using GameCore.ECS.Interfaces;
+using GameCore.Events;
+
+namespace GameCore.Player;
+
+public class EquipmentSystem : ISystem
+{
+    private readonly IWeaponDataService _weaponDataService;
+    private readonly World _world;
+
+    public EquipmentSystem(World world, IWeaponDataService weaponDataService)
+    {
+        _world = world;
+        _weaponDataService = weaponDataService;
+        _world.Subscribe<EquipWeaponEvent>(OnEquipWeapon);
+    }
+
+    public void Update(World world, float deltaTime)
+    {
+    }
+
+    private void OnEquipWeapon(EquipWeaponEvent e)
+    {
+        if (!_weaponDataService.TryGetWeaponData(e.NewWeaponItemId, out var newData)) return;
+
+        var weaponComponent = _world.GetComponent<WeaponComponent>(e.Owner);
+        if (weaponComponent == null)
+        {
+            weaponComponent = new WeaponComponent();
+            _world.AddComponent(e.Owner, weaponComponent);
+        }
+
+        weaponComponent.FireRate = newData.FireRate;
+        weaponComponent.FireCosts = newData.FireCosts;
+        weaponComponent.OnFireEffects = newData.OnFireEffects;
+        weaponComponent.OnHitEffects = newData.OnHitEffects;
+        weaponComponent.CooldownTimer = 0f;
+    }
+}