brick-framework/GameCore/Combat/HealingSystem.cs

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));
    }
}