using UnityEngine;

namespace Colosseum.Skills.Effects
{
    /// <summary>
    /// 프리팹 스폰 효과 (투사체, 파티클 등)
    /// </summary>
    [CreateAssetMenu(fileName = "SpawnEffect", menuName = "Colosseum/Skills/Effects/Spawn")]
    public class SpawnEffect : SkillEffect
    {
        [Header("Spawn Settings")]
        [SerializeField] private GameObject prefab;
        [SerializeField] private SpawnLocation spawnLocation = SpawnLocation.Caster;
        [SerializeField] private Vector3 spawnOffset = Vector3.zero;
        [SerializeField] private bool parentToCaster = false;
        [Min(0f)] [SerializeField] private float autoDestroyTime = 3f;

        protected override void ApplyEffect(GameObject caster, GameObject target)
        {
            if (prefab == null || caster == null) return;

            Vector3 spawnPos = GetSpawnPosition(caster, target) + spawnOffset;
            Quaternion spawnRot = GetSpawnRotation(caster, target);
            Transform parent = parentToCaster ? caster.transform : null;

            GameObject instance = Object.Instantiate(prefab, spawnPos, spawnRot, parent);

            // SkillProjectile 컴포넌트가 있으면 초기화
            var projectile = instance.GetComponent<SkillProjectile>();
            if (projectile != null)
            {
                projectile.Initialize(caster, this);
            }

            if (autoDestroyTime > 0f)
            {
                Object.Destroy(instance, autoDestroyTime);
            }
        }

        private Vector3 GetSpawnPosition(GameObject caster, GameObject target)
        {
            return spawnLocation switch
            {
                SpawnLocation.Caster => caster.transform.position,
                SpawnLocation.CasterForward => caster.transform.position + caster.transform.forward * 2f,
                SpawnLocation.Target => target != null ? target.transform.position : caster.transform.position,
                _ => caster.transform.position
            };
        }

        private Quaternion GetSpawnRotation(GameObject caster, GameObject target)
        {
            if (spawnLocation == SpawnLocation.Target && target != null)
            {
                return Quaternion.LookRotation(target.transform.position - caster.transform.position);
            }
            return caster.transform.rotation;
        }
    }

    public enum SpawnLocation
    {
        Caster,
        CasterForward,
        Target
    }
}