using GameCore.Attributes;
using GameCore.ECS;
using GameCore.ECS.Interfaces;
using GameCore.Events;
using Attribute = GameCore.Attributes.Attribute;

namespace GameCore.Combat;

public class DamageSystem : ISystem
{
    private readonly World _world;

    public DamageSystem(World world)
    {
        _world = world;
        world.Subscribe<DamageDealtEvent>(OnDamageDealt);
    }

    public void Update(World world, float deltaTime)
    {
        var entitiesWithHealth = world.GetEntitiesWith<AttributeComponent>();
        foreach (var entity in entitiesWithHealth)
        {
            if (world.GetComponent<DeathComponent>(entity) != null) continue;

            var attributes = world.GetComponent<AttributeComponent>(entity);
            if (attributes == null) continue;

            if (attributes.GetValue(Attribute.Health) <= 0) world.AddComponent(entity, new DeathComponent());
        }
    }

    private void OnDamageDealt(DamageDealtEvent e)
    {
        var targetAttributes = _world.GetComponent<AttributeComponent>(e.Target);
        targetAttributes?.ModifyValue(Attribute.Health, -e.Amount);

        var newHealth = targetAttributes?.GetValue(Attribute.Health) ?? 0f;
        _world.PublishEvent(new EntityDamagedEvent(e.Target, newHealth, e.Amount));
    }
}