using UnityEngine;
using Unity.Netcode;

using Colosseum.Enemy;

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;
        [Tooltip("전투 컨텍스트의 현재 타겟을 스폰 방향 계산에 사용할지 여부")]
        [SerializeField] private bool useCombatContextTarget = false;

        [Header("Hit Settings")]
        [Tooltip("투사체가 대상에 명중했을 때 적용할 효과. 미설정 시 명중 효과 없음.")]
        [SerializeField] private SkillEffect hitEffect;

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

            GameObject resolvedTarget = ResolveTarget(caster, target);
            Vector3 spawnPos = GetSpawnPosition(caster, resolvedTarget) + spawnOffset;
            Quaternion spawnRot = GetSpawnRotation(caster, resolvedTarget);

            var networkObject = prefab.GetComponent<NetworkObject>();
            if (networkObject != null)
            {
                // 네트워크 오브젝트: 서버에서 스폰 후 전파
                // (OnEffect 가드에 의해 이미 서버에서만 호출됨)
                GameObject instance = Object.Instantiate(prefab, spawnPos, spawnRot);
                var spawnedNet = instance.GetComponent<NetworkObject>();
                spawnedNet.Spawn(destroyWithScene: true);

                var projectile = instance.GetComponent<SkillProjectile>();
                if (projectile != null)
                    projectile.Initialize(caster, hitEffect);
            }
            else
            {
                // 로컬 오브젝트 (파티클 등): 기존 방식 유지
                Transform parent = parentToCaster ? caster.transform : null;
                GameObject instance = Object.Instantiate(prefab, spawnPos, spawnRot, parent);

                var projectile = instance.GetComponent<SkillProjectile>();
                if (projectile != null)
                    projectile.Initialize(caster, hitEffect);

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

        private GameObject ResolveTarget(GameObject caster, GameObject target)
        {
            if (!useCombatContextTarget)
                return target;

            if (target != null && target != caster)
                return target;

            BossCombatBehaviorContext context = caster.GetComponent<BossCombatBehaviorContext>();
            return context != null && context.CurrentTarget != null
                ? context.CurrentTarget
                : target;
        }

        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)
        {
            // target이 있으면 항상 target 방향 우선 (SingleAlly 타게팅 지원)
            if (target != null && target != caster)
            {
                Vector3 lookDirection = target.transform.position - caster.transform.position;
                if (lookDirection.sqrMagnitude > 0.0001f)
                    return Quaternion.LookRotation(lookDirection);
            }

            // target이 없으면 spawnLocation 기준
            if (spawnLocation == SpawnLocation.Target)
                return caster.transform.rotation;

            return caster.transform.rotation;
        }
    }

    public enum SpawnLocation
    {
        Caster,
        CasterForward,
        Target
    }
}