using GameCore.ECS;
using GameCore.ECS.Interfaces;
using GameCore.Events;
using GameCore.Player;

namespace GameCore.Combat;

public class WeaponAcquisitionSystem : ISystem
{
    private const string WeaponItemPrefix = "weapon_";
    private readonly World _world;

    public WeaponAcquisitionSystem(World world)
    {
        _world = world;
        _world.Subscribe<AddItemToInventoryEvent>(OnItemAdded);
    }

    public void Update(World world, float deltaTime)
    {
    }

    private void OnItemAdded(AddItemToInventoryEvent e)
    {
        if (!e.Item.ItemId.StartsWith(WeaponItemPrefix)) return;

        var equipment = _world.GetComponent<EquipmentComponent>(e.Target);
        if (equipment == null) return;

        if (!equipment.EquippableWeaponItemIds.Contains(e.Item.ItemId))
            equipment.EquippableWeaponItemIds.Add(e.Item.ItemId);

        if (equipment.CurrentWeaponIndex == -1)
        {
            equipment.CurrentWeaponIndex = equipment.EquippableWeaponItemIds.Count - 1;
            _world.PublishEvent(new EquipWeaponEvent(e.Target, e.Item.ItemId));
        }
    }
}