using System;
using System.Collections.Generic;
using System.IO;

using UnityEngine;
using Unity.Netcode;

using Colosseum.Abnormalities;

#if UNITY_EDITOR
using UnityEditor;
#endif

namespace Colosseum.Skills
{
    /// <summary>
    /// 스킬 강제 취소 이유
    /// </summary>
    public enum SkillCancelReason
    {
        None,
        Manual,
        Interrupt,
        Death,
        Stun,
        HitReaction,
        Respawn,
        Revive,
    }

    /// <summary>
    /// 마지막 스킬 실행 결과입니다.
    /// </summary>
    public enum SkillExecutionResult
    {
        None,
        Running,
        Completed,
        Cancelled,
    }

    /// <summary>
    /// 스킬 실행을 관리하는 컴포넌트.
    /// 애니메이션 이벤트 기반으로 효과가 발동됩니다.
    /// </summary>
    public class SkillController : NetworkBehaviour
    {
        private const string SKILL_STATE_NAME = "Skill";

        [Header("애니메이션")]
        [SerializeField] private Animator animator;
        [Tooltip("기본 Animator Controller (스킬 종료 후 복원용)")]
        [SerializeField] private RuntimeAnimatorController baseController;
        [Tooltip("Skill 상태에 연결된 기본 클립 (Override용). baseController의 Skill state에서 자동 발견됩니다.")]
        [SerializeField] private AnimationClip baseSkillClip;

        [Header("네트워크 동기화")]
        [Tooltip("이 이름이 포함된 클립이 자동 등록됩니다. 서버→클라이언트 클립 동기화에 사용됩니다.")]
        [SerializeField] private string clipAutoRegisterFilter = "_Player_";
        [Tooltip("자동 등록된 클립 목록 (서버→클라이언트 클립 인덱스 동기화용)")]
        [SerializeField] private List<AnimationClip> registeredClips = new();

        [Header("설정")]
        [SerializeField] private bool debugMode = false;
        [Tooltip("공격 범위 시각화 (Scene 뷰에서 확인)")]
        [SerializeField] private bool showAreaDebug = true;
        [Tooltip("범위 표시 지속 시간")]
        [Min(0.1f)] [SerializeField] private float debugDrawDuration = 1f;

        [Header("디버그")]
        [Tooltip("마지막으로 강제 취소된 스킬 이름")]
        [SerializeField] private string lastCancelledSkillName = string.Empty;
        [Tooltip("마지막 강제 취소 이유")]
        [SerializeField] private SkillCancelReason lastCancelReason = SkillCancelReason.None;
        [Tooltip("마지막 스킬 실행 결과")]
        [SerializeField] private SkillExecutionResult lastExecutionResult = SkillExecutionResult.None;

        // 현재 실행 중인 스킬
        private SkillData currentSkill;
        private SkillLoadoutEntry currentLoadoutEntry;
        private readonly List<SkillEffect> currentCastStartEffects = new();
        private readonly Dictionary<int, List<SkillEffect>> currentTriggeredEffects = new();
        private readonly List<AbnormalityData> currentCastStartAbnormalities = new();
        private readonly Dictionary<int, List<AbnormalityData>> currentTriggeredAbnormalities = new();
        private readonly List<GameObject> currentTriggeredTargetsBuffer = new();
        private int currentClipSequenceIndex; // 현재 재생 중인 클립 순서 (animationClips 내 인덱스)
        private int currentRepeatCount = 1;
        private int currentIterationIndex = 0;
        private GameObject currentTargetOverride;
        private Vector3? currentGroundTargetPosition;

        // 채널링 상태
        private bool isChannelingActive = false;
        private float channelElapsedTime = 0f;
        private float channelTickAccumulator = 0f;
        private GameObject channelVfxInstance;
        private readonly List<SkillEffect> currentChannelTickEffects = new();
        private readonly List<SkillEffect> currentChannelEndEffects = new();

        // 쿨타임 추적
        private Dictionary<SkillData, float> cooldownTracker = new Dictionary<SkillData, float>();


        public bool IsExecutingSkill => currentSkill != null;
        public bool IsPlayingAnimation => currentSkill != null;
        public bool UsesRootMotion => currentSkill != null && currentSkill.UseRootMotion;
        public bool IgnoreRootMotionY => currentSkill != null && currentSkill.IgnoreRootMotionY;
        public SkillData CurrentSkill => currentSkill;
        public SkillLoadoutEntry CurrentLoadoutEntry => currentLoadoutEntry;
        public Animator Animator => animator;
        public SkillCancelReason LastCancelReason => lastCancelReason;
        public string LastCancelledSkillName => lastCancelledSkillName;
        public SkillExecutionResult LastExecutionResult => lastExecutionResult;
        public GameObject CurrentTargetOverride => currentTargetOverride;
        public bool IsChannelingActive => isChannelingActive;

        private void Awake()
        {
            lastCancelledSkillName = string.Empty;
            lastCancelReason = SkillCancelReason.None;

            if (animator == null)
            {
                animator = GetComponentInChildren<Animator>();
            }

            // 기본 컨트롤러 저장
            if (baseController == null && animator != null)
            {
                baseController = animator.runtimeAnimatorController;
            }
        }

#if UNITY_EDITOR
        private void OnValidate()
        {
            AutoDiscoverBaseSkillClip();
            AutoRegisterClips();
        }

        /// <summary>
        /// baseController의 Skill 상태에 연결된 클립을 baseSkillClip으로 자동 발견합니다.
        /// </summary>
        private void AutoDiscoverBaseSkillClip()
        {
            if (baseSkillClip != null) return;
            if (baseController == null) return;

            var ac = baseController as UnityEditor.Animations.AnimatorController;
            if (ac == null) return;

            AnimationClip foundClip = FindClipInState(ac, SKILL_STATE_NAME);
            if (foundClip != null)
            {
                baseSkillClip = foundClip;
                UnityEditor.EditorUtility.SetDirty(this);
            }
        }

        /// <summary>
        /// AnimatorController의 지정한 상태에 연결된 AnimationClip을 찾습니다.
        /// </summary>
        private static AnimationClip FindClipInState(UnityEditor.Animations.AnimatorController ac, string stateName)
        {
            for (int i = 0; i < ac.layers.Length; i++)
            {
                AnimationClip clip = FindClipInStateMachine(ac.layers[i].stateMachine, stateName);
                if (clip != null) return clip;
            }

            return null;
        }

        /// <summary>
        /// StateMachine을 재귀적으로 탐색하여 지정한 이름의 상태에서 클립을 찾습니다.
        /// </summary>
        private static AnimationClip FindClipInStateMachine(UnityEditor.Animations.AnimatorStateMachine sm, string stateName)
        {
            for (int i = 0; i < sm.states.Length; i++)
            {
                if (sm.states[i].state.name == stateName && sm.states[i].state.motion is AnimationClip clip)
                    return clip;
            }

            for (int i = 0; i < sm.stateMachines.Length; i++)
            {
                AnimationClip clip = FindClipInStateMachine(sm.stateMachines[i].stateMachine, stateName);
                if (clip != null) return clip;
            }

            return null;
        }

        /// <summary>
        /// clipAutoRegisterFilter 이름이 포함된 모든 AnimationClip을 registeredClips에 자동 등록합니다.
        /// 서버→클라이언트 클립 동기화 인덱스의 일관성을 위해 이름순으로 정렬합니다.
        /// </summary>
        private void AutoRegisterClips()
        {
            string trimmedFilter = clipAutoRegisterFilter.Trim('_');
            if (string.IsNullOrEmpty(trimmedFilter))
                return;

            string[] guids = AssetDatabase.FindAssets("t:AnimationClip", new[] { "Assets/_Game/Animations" });
            var clips = new List<AnimationClip>();

            foreach (string guid in guids)
            {
                string path = AssetDatabase.GUIDToAssetPath(guid);
                string clipName = Path.GetFileNameWithoutExtension(path);

                if (clipName.IndexOf(trimmedFilter, StringComparison.OrdinalIgnoreCase) >= 0)
                {
                    AnimationClip clip = AssetDatabase.LoadAssetAtPath<AnimationClip>(path);
                    if (clip != null)
                        clips.Add(clip);
                }
            }

            clips.Sort((a, b) => string.Compare(a.name, b.name, StringComparison.Ordinal));

            // 변경이 있는 경우만 갱신 (무한 루프 방지)
            bool changed = registeredClips.Count != clips.Count;
            if (!changed)
            {
                for (int i = 0; i < clips.Count; i++)
                {
                    if (registeredClips[i] != clips[i])
                    {
                        changed = true;
                        break;
                    }
                }
            }

            if (changed)
            {
                registeredClips.Clear();
                registeredClips.AddRange(clips);
                Debug.Log($"[SkillController] 자동 등록: {clips.Count}개 클립 (필터: {clipAutoRegisterFilter})", this);
            }
        }
#endif


        private void Update()
        {
            if (currentSkill == null || animator == null) return;

            UpdateCastTargetTracking();

            // 채널링 중일 때
            if (isChannelingActive)
            {
                UpdateChanneling();
                return;
            }

            var stateInfo = animator.GetCurrentAnimatorStateInfo(0);

            // 애니메이션 종료 시 처리
            if (stateInfo.normalizedTime >= 1f)
            {
                // 같은 반복 차수 내에서 다음 클립이 있으면 재생
                if (TryPlayNextClipInSequence())
                    return;

                // 다음 반복 차수가 있으면 시작
                if (TryStartNextIteration())
                    return;

                // 채널링 스킬이면 채널링 시작
                if (currentSkill.IsChanneling)
                {
                    StartChanneling();
                    return;
                }

                // 모든 클립과 반복이 끝나면 종료
                if (debugMode) Debug.Log($"[Skill] Animation complete: {currentSkill.SkillName}");
                RestoreBaseController();
                CompleteCurrentSkillExecution(SkillExecutionResult.Completed);
            }
        }

        /// <summary>
        /// 스킬 시전
        /// </summary>
        public bool ExecuteSkill(SkillData skill)
        {
            return ExecuteSkill(SkillLoadoutEntry.CreateTemporary(skill));
        }

        /// <summary>
        /// 타겟 오버라이드와 함께 스킬 시전
        /// </summary>
        public bool ExecuteSkill(SkillData skill, GameObject targetOverride)
        {
            return ExecuteSkill(SkillLoadoutEntry.CreateTemporary(skill), targetOverride);
        }

        /// <summary>
        /// 슬롯 엔트리 기준으로 스킬 시전
        /// </summary>
        public bool ExecuteSkill(SkillLoadoutEntry loadoutEntry)
        {
            currentTargetOverride = null;
            return ExecuteSkillInternal(loadoutEntry);
        }

        /// <summary>
        /// 타겟 오버라이드와 함께 스킬 시전.
        /// SingleAlly 타입 효과에서 외부 타겟을 사용할 때 호출합니다.
        /// </summary>
        public bool ExecuteSkill(SkillLoadoutEntry loadoutEntry, GameObject targetOverride)
        {
            currentTargetOverride = targetOverride;
            return ExecuteSkillInternal(loadoutEntry);
        }

        /// <summary>
        /// 지면 타겟 위치와 함께 스킬 시전.
        /// Ground Target 스킬에서 사용합니다.
        /// </summary>
        public bool ExecuteSkill(SkillLoadoutEntry loadoutEntry, GameObject targetOverride, Vector3 groundTargetPosition)
        {
            currentTargetOverride = targetOverride;
            currentGroundTargetPosition = groundTargetPosition;
            return ExecuteSkillInternal(loadoutEntry);
        }

        /// <summary>
        /// 스킬 시전 공통 로직
        /// </summary>
        private bool ExecuteSkillInternal(SkillLoadoutEntry loadoutEntry)
        {
            SkillData skill = loadoutEntry != null ? loadoutEntry.BaseSkill : null;
            if (skill == null)
            {
                Debug.LogWarning("Skill is null!");
                return false;
            }

            // 사망 상태면 스킬 사용 불가
            var damageable = GetComponent<Colosseum.Combat.IDamageable>();
            if (damageable != null && damageable.IsDead)
            {
                if (debugMode) Debug.Log($"[Skill] Cannot execute skill - owner is dead");
                return false;
            }

            if (IsExecutingSkill)
            {
                if (debugMode) Debug.Log($"Already executing skill: {currentSkill.SkillName}");
                return false;
            }

            if (IsOnCooldown(skill))
            {
                if (debugMode) Debug.Log($"Skill {skill.SkillName} is on cooldown");
                return false;
            }

            currentLoadoutEntry = loadoutEntry != null ? loadoutEntry.CreateCopy() : SkillLoadoutEntry.CreateTemporary(skill);
            currentSkill = skill;
            lastCancelReason = SkillCancelReason.None;
            lastExecutionResult = SkillExecutionResult.Running;
            BuildResolvedEffects(currentLoadoutEntry);
            currentRepeatCount = currentLoadoutEntry.GetResolvedRepeatCount();
            currentIterationIndex = 0;

            if (debugMode) Debug.Log($"[Skill] Cast: {skill.SkillName}");

            // 쿨타임 시작
            StartCooldown(skill, currentLoadoutEntry.GetResolvedCooldown());

            StartCurrentIteration();

            return true;
        }

        /// <summary>
        /// 시전 시작 즉시 발동하는 효과를 실행합니다.
        /// 서버 권한으로만 처리해 실제 게임플레이 효과가 한 번만 적용되게 합니다.
        /// </summary>
        private void TriggerCastStartEffects()
        {
            if (currentSkill == null)
                return;

            // VFX는 모든 클라이언트에서 로컬 생성 (서버 가드 무시)
            for (int i = 0; i < currentCastStartEffects.Count; i++)
            {
                SkillEffect effect = currentCastStartEffects[i];
                if (effect != null && effect.IsVisualOnly)
                {
                    if (debugMode) Debug.Log($"[Skill] Cast start VFX: {effect.name} (index {i})");
                    effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
                }
            }

            // 게임플레이 효과는 서버에서만 실행
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer)
                return;

            for (int i = 0; i < currentCastStartEffects.Count; i++)
            {
                SkillEffect effect = currentCastStartEffects[i];
                if (effect == null || effect.IsVisualOnly)
                    continue;

                if (debugMode) Debug.Log($"[Skill] Cast start effect: {effect.name} (index {i})");
                effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
            }

            if (currentCastStartAbnormalities.Count <= 0)
                return;

            AbnormalityManager abnormalityManager = GetComponent<AbnormalityManager>();
            if (abnormalityManager == null)
            {
                if (debugMode) Debug.LogWarning("[Skill] Cast start abnormality skipped - no AbnormalityManager");
                return;
            }

            for (int i = 0; i < currentCastStartAbnormalities.Count; i++)
            {
                AbnormalityData abnormality = currentCastStartAbnormalities[i];
                if (abnormality == null)
                    continue;

                if (debugMode) Debug.Log($"[Skill] Cast start abnormality: {abnormality.abnormalityName} (index {i})");
                abnormalityManager.ApplyAbnormality(abnormality, gameObject);
            }
        }

        /// <summary>
        /// 애니메이션 이벤트가 없는 자기 자신 대상 효과는 시전 즉시 발동합니다.
        /// 버프/무적 같은 자기 강화 스킬이 이벤트 누락으로 동작하지 않는 상황을 막기 위한 보정입니다.
        /// </summary>
        private void TriggerImmediateSelfEffectsIfNeeded()
        {
            if (currentSkill == null || currentTriggeredEffects.Count == 0)
                return;

            if (currentSkill.SkillClip != null && currentSkill.SkillClip.events != null && currentSkill.SkillClip.events.Length > 0)
                return;

            if (!currentTriggeredEffects.TryGetValue(0, out List<SkillEffect> effectsAtZero))
                return;

            // VFX는 모든 클라이언트에서 로컬 생성 (서버 가드 무시)
            for (int i = 0; i < effectsAtZero.Count; i++)
            {
                SkillEffect effect = effectsAtZero[i];
                if (effect != null && effect.IsVisualOnly && effect.TargetType == TargetType.Self)
                {
                    if (debugMode) Debug.Log($"[Skill] Immediate self VFX: {effect.name} (index {i})");
                    effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
                }
            }

            // 게임플레이 효과는 서버에서만 실행
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer)
                return;

            for (int i = 0; i < effectsAtZero.Count; i++)
            {
                SkillEffect effect = effectsAtZero[i];
                if (effect == null || effect.TargetType != TargetType.Self || effect.IsVisualOnly)
                    continue;

                if (debugMode) Debug.Log($"[Skill] Immediate self effect: {effect.name} (index {i})");
                effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
            }
        }

        /// <summary>
        /// 현재 슬롯 엔트리 기준으로 시전 시작/트리거 효과를 합성합니다.
        /// </summary>
        private void BuildResolvedEffects(SkillLoadoutEntry loadoutEntry)
        {
            currentCastStartEffects.Clear();
            currentTriggeredEffects.Clear();
            currentCastStartAbnormalities.Clear();
            currentTriggeredAbnormalities.Clear();

            if (loadoutEntry == null)
                return;

            loadoutEntry.CollectCastStartEffects(currentCastStartEffects);
            loadoutEntry.CollectTriggeredEffects(currentTriggeredEffects);
            loadoutEntry.CollectCastStartAbnormalities(currentCastStartAbnormalities);
            loadoutEntry.CollectTriggeredAbnormalities(currentTriggeredAbnormalities);
            loadoutEntry.CollectChannelTickEffects(currentChannelTickEffects);
            loadoutEntry.CollectChannelEndEffects(currentChannelEndEffects);
        }

        /// <summary>
        /// 현재 스킬의 반복 차수 하나를 시작합니다.
        /// </summary>
        private void StartCurrentIteration()
        {
            if (currentSkill == null)
                return;

            currentIterationIndex++;
            currentClipSequenceIndex = 0;

            if (debugMode && currentRepeatCount > 1)
            {
                Debug.Log($"[Skill] Iteration {currentIterationIndex}/{currentRepeatCount}: {currentSkill.SkillName}");
            }

            TriggerCastStartEffects();

            if (currentSkill.AnimationClips.Count > 0 && animator != null)
            {
                float resolvedAnimationSpeed = currentLoadoutEntry != null
                    ? currentLoadoutEntry.GetResolvedAnimationSpeed()
                    : currentSkill.AnimationSpeed;
                animator.speed = resolvedAnimationSpeed;
                PlaySkillClip(currentSkill.AnimationClips[0]);
            }

            TriggerImmediateSelfEffectsIfNeeded();
        }

        /// <summary>
        /// 시퀀스 내 다음 클립이 있으면 재생합니다.
        /// </summary>
        private bool TryPlayNextClipInSequence()
        {
            if (currentSkill == null)
                return false;

            int nextIndex = currentClipSequenceIndex + 1;
            if (nextIndex >= currentSkill.AnimationClips.Count)
                return false;

            currentClipSequenceIndex = nextIndex;
            PlaySkillClip(currentSkill.AnimationClips[currentClipSequenceIndex]);

            if (debugMode)
            {
                Debug.Log($"[Skill] Playing clip {currentClipSequenceIndex + 1}/{currentSkill.AnimationClips.Count}: {currentSkill.AnimationClips[currentClipSequenceIndex].name}");
            }

            return true;
        }

        /// <summary>
        /// 반복 시전이 남아 있으면 다음 차수를 시작합니다.
        /// </summary>
        private bool TryStartNextIteration()
        {
            if (currentSkill == null)
                return false;

            if (currentIterationIndex >= currentRepeatCount)
                return false;

            StartCurrentIteration();
            return true;
        }

        /// <summary>
        /// 스킬 클립으로 Override Controller 생성 후 재생
        /// </summary>
        private void PlaySkillClip(AnimationClip clip)
        {
            if (baseSkillClip == null)
            {
                Debug.LogError("[SkillController] Base Skill Clip is not assigned!");
                return;
            }

            if (debugMode)
            {
                Debug.Log($"[Skill] PlaySkillClip: {clip.name}, BaseClip: {baseSkillClip.name}");
            }

            var overrideController = new AnimatorOverrideController(baseController);
            overrideController[baseSkillClip] = clip;
            animator.runtimeAnimatorController = overrideController;

            // 애니메이터 완전 리셋 후 재생
            animator.Rebind();
            animator.Update(0f);
            animator.Play(SKILL_STATE_NAME, 0, 0f);

            // 클라이언트에 클립 동기화
            if (IsServer && IsSpawned)
                PlaySkillClipClientRpc(registeredClips.IndexOf(clip));
        }

        /// <summary>
        /// 기본 컨트롤러로 복원
        /// </summary>
        private void RestoreBaseController()
        {
            if (animator != null && baseController != null)
            {
                animator.runtimeAnimatorController = baseController;
                animator.speed = 1f;
            }

            // 클라이언트에 복원 동기화
            if (IsServer && IsSpawned)
                RestoreBaseControllerClientRpc();
        }

        /// <summary>
        /// 클라이언트: override 컨트롤러 적용 + 스킬 상태 재생 (원자적 실행으로 타이밍 문제 해결)
        /// </summary>
        [Rpc(SendTo.NotServer)]
        private void PlaySkillClipClientRpc(int clipIndex)
        {
            if (baseSkillClip == null || animator == null || baseController == null) return;
            if (clipIndex < 0 || clipIndex >= registeredClips.Count || registeredClips[clipIndex] == null)
            {
                if (debugMode) Debug.LogWarning($"[SkillController] Clip index {clipIndex} not found in registeredClips. Add it to sync to clients.");
                return;
            }

            var overrideController = new AnimatorOverrideController(baseController);
            overrideController[baseSkillClip] = registeredClips[clipIndex];
            animator.runtimeAnimatorController = overrideController;
            animator.Rebind();
            animator.Update(0f);
            animator.Play(SKILL_STATE_NAME, 0, 0f);
        }

        /// <summary>
        /// 클라이언트: 기본 컨트롤러 복원
        /// </summary>
        [Rpc(SendTo.NotServer)]
        private void RestoreBaseControllerClientRpc()
        {
            if (animator != null && baseController != null)
                animator.runtimeAnimatorController = baseController;
        }

        /// <summary>
        /// 애니메이션 이벤트에서 호출. Effect 리스트의 index번째 효과를 발동합니다.
        /// Animation Event: Function = OnEffect, Int Parameter = effect index (0-based)
        /// </summary>
        public void OnEffect(int index)
        {
            if (currentSkill == null)
            {
                if (debugMode) Debug.LogWarning("[Effect] No skill executing");
                return;
            }

            // 사망 상태면 효과 발동 중단
            var damageable = GetComponent<Colosseum.Combat.IDamageable>();
            if (damageable != null && damageable.IsDead)
            {
                if (debugMode) Debug.Log($"[Effect] Cancelled - owner is dead");
                return;
            }

            if (!currentTriggeredEffects.TryGetValue(index, out List<SkillEffect> effects) || effects == null || effects.Count == 0)
            {
                if (debugMode) Debug.LogWarning($"[Effect] Invalid index: {index}");
                return;
            }

            // VFX는 모든 클라이언트에서 로컬 생성 (서버 가드 무시)
            for (int i = 0; i < effects.Count; i++)
            {
                SkillEffect effect = effects[i];
                if (effect != null && effect.IsVisualOnly)
                {
                    if (debugMode) Debug.Log($"[Effect] VFX: {effect.name} (index {index})");
                    effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
                }
            }

            // 게임플레이 효과는 서버에서만 실행
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer) return;

            for (int i = 0; i < effects.Count; i++)
            {
                SkillEffect effect = effects[i];
                if (effect == null || effect.IsVisualOnly)
                    continue;

                if (debugMode) Debug.Log($"[Effect] {effect.name} (index {index})");

                // 공격 범위 시각화
                if (showAreaDebug)
                {
                    effect.DrawDebugRange(gameObject, debugDrawDuration, currentGroundTargetPosition);
                }

                effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
            }
        }

        /// <summary>
        /// 애니메이션 이벤트에서 호출. 스킬 종료를 요청합니다.
        /// 애니메이션은 끝까지 재생된 후 종료됩니다.
        /// Animation Event: Function = OnSkillEnd
        /// </summary>
        public void OnSkillEnd()
        {
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer) return;

            if (currentSkill == null)
            {
                if (debugMode) Debug.LogWarning("[SkillEnd] No skill executing");
                return;
            }

            if (debugMode) Debug.Log($"[Skill] End event received: {currentSkill.SkillName}");
        }

        /// <summary>
        /// 현재 스킬을 강제 취소합니다.
        /// </summary>
        public bool CancelSkill(SkillCancelReason reason = SkillCancelReason.Manual)
        {
            if (currentSkill == null)
                return false;

            lastCancelledSkillName = currentSkill.SkillName;
            lastCancelReason = reason;

            Debug.Log($"[Skill] Cancelled: {currentSkill.SkillName} / reason={reason}");

            RestoreBaseController();
            CompleteCurrentSkillExecution(SkillExecutionResult.Cancelled);
            return true;
        }

        public bool IsOnCooldown(SkillData skill)
        {
            if (!cooldownTracker.ContainsKey(skill))
                return false;

            return Time.time < cooldownTracker[skill];
        }

        public float GetRemainingCooldown(SkillData skill)
        {
            if (!cooldownTracker.ContainsKey(skill))
                return 0f;

            float remaining = cooldownTracker[skill] - Time.time;
            return Mathf.Max(0f, remaining);
        }

        private void StartCooldown(SkillData skill, float cooldownDuration)
        {
            cooldownTracker[skill] = Time.time + cooldownDuration;
        }

        public void ResetCooldown(SkillData skill)
        {
            cooldownTracker.Remove(skill);
        }

        public void ResetAllCooldowns()
        {
            cooldownTracker.Clear();
        }

        /// <summary>
        /// 채널링을 시작합니다. 캐스트 애니메이션 종료 후 호출됩니다.
        /// </summary>
        private void StartChanneling()
        {
            if (currentSkill == null || !currentSkill.IsChanneling)
                return;

            isChannelingActive = true;
            channelElapsedTime = 0f;
            channelTickAccumulator = 0f;

            SpawnChannelVfx();

            if (debugMode)
                Debug.Log($"[Skill] 채널링 시작: {currentSkill.SkillName} (duration={currentSkill.ChannelDuration}s, tick={currentSkill.ChannelTickInterval}s)");
        }

        /// <summary>
        /// 채널링 VFX를 시전자 위치에 생성합니다.
        /// </summary>
        private void SpawnChannelVfx()
        {
            if (currentSkill == null || currentSkill.ChannelVfxPrefab == null)
                return;

            Transform mount = ResolveChannelVfxMount();
            Vector3 spawnPos = mount != null ? mount.position : transform.position;

            channelVfxInstance = UnityEngine.Object.Instantiate(
                currentSkill.ChannelVfxPrefab,
                spawnPos,
                transform.rotation);

            if (mount != null)
                channelVfxInstance.transform.SetParent(mount);

            channelVfxInstance.transform.localScale = new Vector3(
                currentSkill.ChannelVfxWidthScale,
                currentSkill.ChannelVfxWidthScale,
                currentSkill.ChannelVfxLengthScale);

            // 모든 파티클을 루핑 모드로 설정
            ForceLoopParticleSystems(channelVfxInstance);
        }

        /// <summary>
        /// 하위 모든 ParticleSystem을 루핑 모드로 강제 설정하고 충돌을 비활성화합니다.
        /// 채널링 종료 시 파괴되므로 자연 종료 및 충돌 반응 방지용.
        /// </summary>
        private static void ForceLoopParticleSystems(GameObject instance)
        {
            if (instance == null) return;

            ParticleSystem[] particles = instance.GetComponentsInChildren<ParticleSystem>(true);
            for (int i = 0; i < particles.Length; i++)
            {
                var main = particles[i].main;
                main.loop = true;
                main.stopAction = ParticleSystemStopAction.None;

                var collision = particles[i].collision;
                collision.enabled = false;
            }
        }

        /// <summary>
        /// channelVfxMountPath에서 VFX 장착 위치를 찾습니다.
        /// </summary>
        private Transform ResolveChannelVfxMount()
        {
            if (currentSkill == null || string.IsNullOrEmpty(currentSkill.ChannelVfxMountPath))
                return null;

            // Animator 하위에서 이름으로 재귀 검색
            Animator animator = GetComponentInChildren<Animator>();
            if (animator != null)
            {
                Transform found = FindTransformRecursive(animator.transform, currentSkill.ChannelVfxMountPath);
                if (found != null)
                    return found;
            }

            // 자식 GameObject에서 경로 검색
            return transform.Find(currentSkill.ChannelVfxMountPath);
        }

        private static Transform FindTransformRecursive(Transform parent, string name)
        {
            for (int i = 0; i < parent.childCount; i++)
            {
                Transform child = parent.GetChild(i);
                if (child.name == name)
                    return child;

                Transform found = FindTransformRecursive(child, name);
                if (found != null)
                    return found;
            }
            return null;
        }

        /// <summary>
        /// 채널링 VFX를 파괴합니다.
        /// </summary>
        private void DestroyChannelVfx()
        {
            if (channelVfxInstance != null)
            {
                UnityEngine.Object.Destroy(channelVfxInstance);
                channelVfxInstance = null;
            }
        }

        /// <summary>
        /// 채널링을 매 프레임 업데이트합니다. 틱 효과를 주기적으로 발동합니다.
        /// </summary>
        private void UpdateChanneling()
        {
            if (!isChannelingActive || currentSkill == null)
                return;

            channelElapsedTime += Time.deltaTime;
            channelTickAccumulator += Time.deltaTime;

            // 틱 효과 발동
            float tickInterval = currentSkill.ChannelTickInterval;
            while (channelTickAccumulator >= tickInterval)
            {
                channelTickAccumulator -= tickInterval;
                TriggerChannelTick();
            }

            // 지속 시간 초과 → 채널링 종료
            if (channelElapsedTime >= currentSkill.ChannelDuration)
            {
                if (debugMode)
                    Debug.Log($"[Skill] 채널링 지속 시간 만료: {currentSkill.SkillName}");
                EndChanneling();
            }
        }

        /// <summary>
        /// 채널링 틱 효과를 발동합니다.
        /// </summary>
        private void TriggerChannelTick()
        {
            if (currentChannelTickEffects.Count == 0)
                return;

            if (debugMode)
                Debug.Log($"[Skill] 채널링 틱 발동: {currentSkill.SkillName} (elapsed={channelElapsedTime:F1}s)");

            // VFX는 모든 클라이언트에서 로컬 실행
            for (int i = 0; i < currentChannelTickEffects.Count; i++)
            {
                SkillEffect effect = currentChannelTickEffects[i];
                if (effect != null && effect.IsVisualOnly)
                {
                    effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
                }
            }

            // 게임플레이 효과는 서버에서만 실행
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer)
                return;

            for (int i = 0; i < currentChannelTickEffects.Count; i++)
            {
                SkillEffect effect = currentChannelTickEffects[i];
                if (effect == null || effect.IsVisualOnly)
                    continue;

                if (debugMode)
                    Debug.Log($"[Skill] 채널링 틱 효과: {effect.name}");

                if (showAreaDebug)
                    effect.DrawDebugRange(gameObject, debugDrawDuration, currentGroundTargetPosition);

                effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
            }
        }

        /// <summary>
        /// 채널링을 종료합니다. 종료 효과를 발동하고 스킬 상태를 정리합니다.
        /// </summary>
        private void EndChanneling()
        {
            if (!isChannelingActive)
                return;

            // 채널링 종료 효과 발동
            TriggerChannelEndEffects();
            DestroyChannelVfx();

            isChannelingActive = false;
            channelElapsedTime = 0f;
            channelTickAccumulator = 0f;

            if (debugMode)
                Debug.Log($"[Skill] 채널링 종료: {currentSkill?.SkillName}");

            RestoreBaseController();
            CompleteCurrentSkillExecution(SkillExecutionResult.Completed);
        }

        /// <summary>
        /// 채널링 종료 효과를 발동합니다.
        /// </summary>
        private void TriggerChannelEndEffects()
        {
            if (currentChannelEndEffects.Count == 0)
                return;

            // VFX는 모든 클라이언트에서 로컬 실행
            for (int i = 0; i < currentChannelEndEffects.Count; i++)
            {
                SkillEffect effect = currentChannelEndEffects[i];
                if (effect != null && effect.IsVisualOnly)
                {
                    effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
                }
            }

            // 게임플레이 효과는 서버에서만 실행
            if (NetworkManager.Singleton != null && !NetworkManager.Singleton.IsServer)
                return;

            for (int i = 0; i < currentChannelEndEffects.Count; i++)
            {
                SkillEffect effect = currentChannelEndEffects[i];
                if (effect == null || effect.IsVisualOnly)
                    continue;

                if (debugMode)
                    Debug.Log($"[Skill] 채널링 종료 효과: {effect.name}");

                effect.ExecuteOnCast(gameObject, currentTargetOverride, currentGroundTargetPosition);
            }
        }

        /// <summary>
        /// 플레이어가 버튼을 놓았을 때 채널링을 중단합니다.
        /// PlayerSkillInput에서 호출됩니다.
        /// </summary>
        public void NotifyChannelHoldReleased()
        {
            if (!isChannelingActive)
                return;

            if (debugMode)
                Debug.Log($"[Skill] 채널링 버튼 해제로 중단: {currentSkill?.SkillName}");

            EndChanneling();
        }

        /// <summary>
        /// 현재 실행 중인 스킬 상태를 정리합니다.
        /// </summary>
        private void ClearCurrentSkillState()
        {
            currentSkill = null;
            currentLoadoutEntry = null;
            currentCastStartEffects.Clear();
            currentTriggeredEffects.Clear();
            currentCastStartAbnormalities.Clear();
            currentTriggeredAbnormalities.Clear();
            currentTriggeredTargetsBuffer.Clear();
            currentChannelTickEffects.Clear();
            currentChannelEndEffects.Clear();
            isChannelingActive = false;
            channelElapsedTime = 0f;
            channelTickAccumulator = 0f;
            DestroyChannelVfx();
            currentTargetOverride = null;
            currentGroundTargetPosition = null;
            currentClipSequenceIndex = 0;
            currentRepeatCount = 1;
            currentIterationIndex = 0;
        }

        /// <summary>
        /// 현재 시전 중인 스킬을 지정 결과로 종료합니다.
        /// </summary>
        private void CompleteCurrentSkillExecution(SkillExecutionResult result)
        {
            lastExecutionResult = result;
            ClearCurrentSkillState();
        }

        /// <summary>
        /// 적 스킬이 시전 중일 때 대상 추적 정책을 적용합니다.
        /// </summary>
        private void UpdateCastTargetTracking()
        {
            if (currentSkill == null || currentTargetOverride == null || !currentTargetOverride.activeInHierarchy)
                return;

            var enemyBase = GetComponent<Colosseum.Enemy.EnemyBase>();
            if (enemyBase == null)
                return;

            if (IsSpawned && !IsServer)
                return;

            Vector3 direction = currentTargetOverride.transform.position - transform.position;
            direction.y = 0f;
            if (direction.sqrMagnitude < 0.0001f)
                return;

            if (currentSkill.CastTargetTrackingMode == SkillCastTargetTrackingMode.FaceTarget ||
                currentSkill.CastTargetTrackingMode == SkillCastTargetTrackingMode.MoveTowardTarget)
            {
                Quaternion targetRotation = Quaternion.LookRotation(direction.normalized);
                float rotationSpeed = Mathf.Max(0f, currentSkill.CastTargetRotationSpeed);
                if (rotationSpeed <= 0f)
                    transform.rotation = targetRotation;
                else
                    transform.rotation = Quaternion.RotateTowards(transform.rotation, targetRotation, rotationSpeed * 360f * Time.deltaTime);
            }

            if (currentSkill.CastTargetTrackingMode != SkillCastTargetTrackingMode.MoveTowardTarget || currentSkill.UseRootMotion)
                return;

            UnityEngine.AI.NavMeshAgent navMeshAgent = GetComponent<UnityEngine.AI.NavMeshAgent>();
            if (navMeshAgent == null || !navMeshAgent.enabled)
                return;

            float stopDistance = Mathf.Max(0f, currentSkill.CastTargetStopDistance);
            if (direction.magnitude <= stopDistance)
            {
                navMeshAgent.isStopped = true;
                navMeshAgent.ResetPath();
                return;
            }

            navMeshAgent.isStopped = false;
            navMeshAgent.SetDestination(currentTargetOverride.transform.position);
        }

        /// <summary>
        /// 현재 트리거 인덱스에 연결된 젬 이상상태를 적중 대상에게 적용합니다.
        /// </summary>
        private void ApplyTriggeredAbnormalities(int index, List<SkillEffect> referenceEffects)
        {
            if (!currentTriggeredAbnormalities.TryGetValue(index, out List<AbnormalityData> abnormalities) ||
                abnormalities == null ||
                abnormalities.Count == 0)
            {
                return;
            }

            currentTriggeredTargetsBuffer.Clear();

            for (int i = 0; i < referenceEffects.Count; i++)
            {
                SkillEffect effect = referenceEffects[i];
                if (effect == null || effect.TargetType == TargetType.Self)
                    continue;

                effect.CollectTargets(gameObject, currentTriggeredTargetsBuffer, currentTargetOverride, currentGroundTargetPosition);
            }

            if (currentTriggeredTargetsBuffer.Count == 0)
            {
                if (debugMode)
                {
                    Debug.LogWarning($"[Skill] Trigger abnormality skipped - no hit target resolved for index {index}");
                }
                return;
            }

            for (int i = 0; i < currentTriggeredTargetsBuffer.Count; i++)
            {
                GameObject target = currentTriggeredTargetsBuffer[i];
                if (target == null)
                    continue;

                AbnormalityManager abnormalityManager = target.GetComponent<AbnormalityManager>();
                if (abnormalityManager == null)
                    continue;

                for (int j = 0; j < abnormalities.Count; j++)
                {
                    AbnormalityData abnormality = abnormalities[j];
                    if (abnormality == null)
                        continue;

                    if (debugMode)
                    {
                        Debug.Log($"[Skill] Trigger abnormality: {abnormality.abnormalityName} -> {target.name} (index {index})");
                    }

                    abnormalityManager.ApplyAbnormality(abnormality, gameObject);
                }
            }

            currentTriggeredTargetsBuffer.Clear();
        }
    }
}