using UnityEngine;

namespace Skill_V2
{
    [CreateAssetMenu(fileName = "SpawnBullet", menuName = "ScriptableObject/Skill/State/SpawnBullet")]
    public class SpawnBullet : SkillState
    {
        [SerializeField] Bullet bulletPrefab;
        [SerializeField, TagSelector] string[] filterTags;

        Bullet bulletInstance;
        SingleTargetFinder targetFinder;

        public override void Enter(StateHandler excutor)
        {
            if(targetFinder is null)
                targetFinder = new SingleTargetFinder(filterTags);

            bulletInstance = Instantiate(bulletPrefab, Owner.CenterPivot, Quaternion.identity);
            bulletInstance.AddTagFilter(filterTags);
            bulletInstance.OnEnterCollider += HandleCollide;

            if (targetFinder.TryFindNearest(Owner.CenterPivot, out var target))
            {
                bulletInstance.Fire(target.transform);
            }
            else
            {
                bulletInstance.HeadDirection = Owner.LookDirection;
                bulletInstance.Fire();
            }

            IsDone = true;
        }

        public override void Stop()
        {
            if (bulletInstance != null)
            {
                Destroy(bulletInstance.gameObject);
            }

            bulletInstance = null;
        }

        private void HandleCollide(Collider2D other)
        {
            if (other.gameObject.TryGetComponent(out CreatureBase target))
            {
                //TODO : Get damage from skill, this is temporary
                BattleMgr.Instance.SendDamage(target, 4000, 0, 0);
            }
        }
    }
}