#if UNITY_EDITOR || DEVELOPMENT_BUILD

using System.Collections;

using Unity.Behavior;
using UnityEngine;

using Colosseum.Abnormalities;
using Colosseum.AI;
using Colosseum.Combat;
using Colosseum.Player;
using Colosseum.Skills;

namespace Colosseum.Enemy
{
    /// <summary>
    /// 디버그 패턴 강제 발동 중 BT 개입 방식을 정의합니다.
    /// </summary>
    public enum DebugPatternBehaviorTreeMode
    {
        DisableDuringPattern = 0,
        KeepRunning = 1,
    }

    /// <summary>
    /// 디버그 패널에서 보스 패턴을 임의 발동할 때 사용하는 런타임 실행기입니다.
    /// </summary>
    [DisallowMultipleComponent]
    [RequireComponent(typeof(BossEnemy))]
    [RequireComponent(typeof(BossBehaviorRuntimeState))]
    [RequireComponent(typeof(SkillController))]
    public class BossPatternDebugRunner : MonoBehaviour
    {
        [Header("Debug")]
        [Tooltip("패턴 디버그 실행기 로그 출력 여부")]
        [SerializeField] private bool debugMode;

        private BossEnemy bossEnemy;
        private EnemyBase enemyBase;
        private SkillController skillController;
        private BossBehaviorRuntimeState runtimeState;
        private AbnormalityManager abnormalityManager;
        private UnityEngine.AI.NavMeshAgent navMeshAgent;
        private BehaviorGraphAgent behaviorGraphAgent;

        private Coroutine activePatternRoutine;
        private BossPatternData currentPattern;
        private GameObject currentTarget;
        private ChargeStepData activeChargeData;
        private float chargeEndTime;
        private float chargeAccumulatedDamage;
        private float chargeRequiredDamage;
        private bool isChargeWaiting;
        private bool chargeTelegraphApplied;
        private bool restoreBehaviorGraphWhenDebugPauseEnds;
        private bool debugBehaviorGraphPaused;

        /// <summary>
        /// 현재 디버그 패턴 실행 중 여부입니다.
        /// </summary>
        public bool IsExecutingPattern => activePatternRoutine != null;

        /// <summary>
        /// 현재 디버그 실행 중인 패턴입니다.
        /// </summary>
        public BossPatternData CurrentPattern => currentPattern;

        /// <summary>
        /// 디버그 토글로 BT가 중지된 상태인지 반환합니다.
        /// </summary>
        public bool IsBehaviorTreePaused => debugBehaviorGraphPaused;

        private bool IsServer => Unity.Netcode.NetworkManager.Singleton != null
            && Unity.Netcode.NetworkManager.Singleton.IsServer;

        private void Awake()
        {
            ResolveReferences();
        }

        private void Update()
        {
            if (!IsExecutingPattern)
                return;

            StopMovement();
        }

        private void OnDisable()
        {
            CancelPattern();
        }

        /// <summary>
        /// 지정한 패턴을 디버그 용도로 즉시 실행합니다.
        /// </summary>
        public bool TryExecutePattern(BossPatternData pattern, DebugPatternBehaviorTreeMode behaviorTreeMode = DebugPatternBehaviorTreeMode.DisableDuringPattern)
        {
            if (!IsServer)
            {
                Debug.LogWarning("[BossPatternDebugRunner] 서버가 아니어서 패턴을 강제 발동할 수 없습니다.", this);
                return false;
            }

            ResolveReferences();

            if (pattern == null)
            {
                Debug.LogWarning("[BossPatternDebugRunner] 발동할 패턴이 비어 있습니다.", this);
                return false;
            }

            if (bossEnemy == null || enemyBase == null || skillController == null || runtimeState == null)
            {
                Debug.LogWarning("[BossPatternDebugRunner] 필수 컴포넌트를 찾지 못해 패턴을 실행할 수 없습니다.", this);
                return false;
            }

            if (bossEnemy.IsDead)
            {
                Debug.LogWarning($"[BossPatternDebugRunner] 사망 상태에서는 패턴을 실행할 수 없습니다: {pattern.PatternName}", this);
                return false;
            }

            CancelPattern();

            if (skillController.IsExecutingSkill)
                skillController.CancelSkill(SkillCancelReason.Interrupt);

            currentTarget = ResolvePatternTarget(pattern);

            currentPattern = pattern;
            runtimeState.WasChargeBroken = false;
            runtimeState.LastChargeStaggerDuration = 0f;
            ApplyPatternFlowState(pattern);
            runtimeState.SetCurrentTarget(currentTarget);
            runtimeState.BeginPatternExecution(pattern);

            StopMovement();
            activePatternRoutine = StartCoroutine(RunPatternRoutine(pattern));
            LogDebug($"디버그 패턴 발동: {pattern.PatternName} / Target={currentTarget?.name ?? "없음"} / BTMode={behaviorTreeMode}");
            return true;
        }

        /// <summary>
        /// 현재 디버그 패턴 실행을 취소합니다.
        /// </summary>
        public void CancelPattern()
        {
            if (activePatternRoutine != null)
            {
                StopCoroutine(activePatternRoutine);
                activePatternRoutine = null;
            }

            if (currentPattern == null)
                return;

            if (skillController != null && skillController.IsExecutingSkill)
                skillController.CancelSkill(SkillCancelReason.Interrupt);

            FinalizePattern(BossPatternExecutionResult.Cancelled, applyCooldown: false);
        }

        /// <summary>
        /// 디버그 토글에 따라 BT를 지속적으로 정지하거나 재개합니다.
        /// </summary>
        public void SetBehaviorTreePaused(bool paused)
        {
            ResolveReferences();
            SetBehaviorGraphSuspended(paused);
        }

        private IEnumerator RunPatternRoutine(BossPatternData pattern)
        {
            BossPatternExecutionResult result = BossPatternExecutionResult.Cancelled;
            bool applyCooldown = false;

            try
            {
                for (int i = 0; i < pattern.Steps.Count; i++)
                {
                    PatternStep step = pattern.Steps[i];

                    if (step.Type == PatternStepType.Wait)
                    {
                        yield return WaitForSeconds(step.Duration);
                        continue;
                    }

                    if (step.Type == PatternStepType.ChargeWait)
                    {
                        bool chargeBroken = false;
                        yield return RunChargeWait(step, value => chargeBroken = value);
                        if (chargeBroken)
                        {
                            runtimeState.WasChargeBroken = true;
                            applyCooldown = true;
                            result = BossPatternExecutionResult.Failed;
                            yield break;
                        }

                        continue;
                    }

                    if (step.Skill == null)
                    {
                        Debug.LogWarning($"[BossPatternDebugRunner] 스킬이 비어 있는 패턴 스텝입니다: {pattern.PatternName} / Step={i}", this);
                        result = BossPatternExecutionResult.Failed;
                        yield break;
                    }

                    GameObject stepTarget = currentTarget;
                    if (step.Skill.JumpToTarget)
                    {
                        stepTarget = ResolveJumpTarget();
                        if (stepTarget == null)
                        {
                            if (pattern.SkipJumpStepOnNoTarget)
                            {
                                applyCooldown = true;
                                result = BossPatternExecutionResult.Succeeded;
                                LogDebug($"점프 대상 없음, 디버그 패턴 조기 종료: {pattern.PatternName}");
                                yield break;
                            }

                            Debug.LogWarning($"[BossPatternDebugRunner] 점프 타겟을 찾지 못했습니다: {pattern.PatternName}", this);
                            result = BossPatternExecutionResult.Failed;
                            yield break;
                        }

                        enemyBase.SetJumpTarget(stepTarget.transform.position);
                    }

                    bool executed = stepTarget != null
                        ? skillController.ExecuteSkill(step.Skill, stepTarget)
                        : skillController.ExecuteSkill(step.Skill);

                    if (!executed)
                    {
                        Debug.LogWarning($"[BossPatternDebugRunner] 스킬 실행 실패: {step.Skill.SkillName}", this);
                        result = BossPatternExecutionResult.Failed;
                        yield break;
                    }

                    LogDebug($"디버그 패턴 실행: {pattern.PatternName} / Step={i} / Skill={step.Skill.SkillName}");

                    while (skillController.IsPlayingAnimation)
                        yield return null;

                    if (skillController.LastExecutionResult != SkillExecutionResult.Completed)
                    {
                        result = BossPatternExecutionResult.Cancelled;
                        yield break;
                    }
                }

                applyCooldown = true;
                result = BossPatternExecutionResult.Succeeded;
            }
            finally
            {
                activePatternRoutine = null;
                FinalizePattern(result, applyCooldown);
            }
        }

        private IEnumerator RunChargeWait(PatternStep step, System.Action<bool> onFinished)
        {
            bool broken = false;
            StartChargeWait(step);

            while (Time.time < chargeEndTime)
            {
                if (chargeAccumulatedDamage >= chargeRequiredDamage)
                {
                    broken = true;
                    break;
                }

                yield return null;
            }

            EndChargeWait(broken);

            if (broken && skillController != null && skillController.IsExecutingSkill)
                skillController.CancelSkill(SkillCancelReason.Interrupt);

            onFinished?.Invoke(broken);
        }

        private IEnumerator WaitForSeconds(float duration)
        {
            float endTime = Time.time + Mathf.Max(0f, duration);
            while (Time.time < endTime)
                yield return null;
        }

        private void StartChargeWait(PatternStep step)
        {
            isChargeWaiting = true;
            activeChargeData = step.ChargeData;
            chargeAccumulatedDamage = 0f;
            chargeTelegraphApplied = false;
            chargeRequiredDamage = bossEnemy.MaxHealth * (activeChargeData != null ? activeChargeData.RequiredDamageRatio : 0.1f);
            chargeEndTime = Time.time + Mathf.Max(0f, step.Duration);

            enemyBase.OnDamageTaken += OnChargeDamageTaken;

            if (activeChargeData != null && activeChargeData.TelegraphAbnormality != null && abnormalityManager != null)
            {
                abnormalityManager.ApplyAbnormality(activeChargeData.TelegraphAbnormality, gameObject);
                chargeTelegraphApplied = true;
            }

            LogDebug($"디버그 충전 대기 시작: 필요 피해={chargeRequiredDamage:F1} / 대기={step.Duration:F1}s");
        }

        private void EndChargeWait(bool broken)
        {
            isChargeWaiting = false;
            enemyBase.OnDamageTaken -= OnChargeDamageTaken;

            if (chargeTelegraphApplied && abnormalityManager != null && activeChargeData != null
                && activeChargeData.TelegraphAbnormality != null)
            {
                abnormalityManager.RemoveAbnormality(activeChargeData.TelegraphAbnormality);
            }

            if (broken && activeChargeData != null)
                runtimeState.LastChargeStaggerDuration = activeChargeData.StaggerDuration;

            activeChargeData = null;
            chargeTelegraphApplied = false;
        }

        private void FinalizePattern(BossPatternExecutionResult result, bool applyCooldown)
        {
            if (isChargeWaiting)
                EndChargeWait(broken: false);

            if (currentPattern != null && runtimeState != null)
            {
                if (applyCooldown)
                    runtimeState.SetPatternCooldown(currentPattern);

                runtimeState.CompletePatternExecution(currentPattern, result);
            }

            currentPattern = null;
            currentTarget = null;
            chargeAccumulatedDamage = 0f;
            chargeRequiredDamage = 0f;
            activeChargeData = null;
            chargeTelegraphApplied = false;
        }

        private void ApplyPatternFlowState(BossPatternData pattern)
        {
            if (runtimeState == null || pattern == null)
                return;

            if (pattern.Category == PatternCategory.Punish || pattern.IsBigPattern)
            {
                runtimeState.ResetBasicLoopCount();
                return;
            }

            if (pattern.IsMelee)
                runtimeState.IncrementBasicLoopCount();
        }

        private GameObject ResolvePatternTarget(BossPatternData pattern)
        {
            if (pattern == null)
                return null;

            return pattern.TargetMode switch
            {
                TargetResolveMode.None => null,
                TargetResolveMode.Mobility => ResolveMobilityTarget(),
                _ => ResolvePrimaryTarget(),
            };
        }

        private GameObject ResolvePrimaryTarget()
        {
            GameObject currentRuntimeTarget = runtimeState != null ? runtimeState.CurrentTarget : null;
            if (IsValidHostileTarget(currentRuntimeTarget))
                return currentRuntimeTarget;

            float aggroRange = enemyBase != null && enemyBase.Data != null ? enemyBase.Data.AggroRange : Mathf.Infinity;
            GameObject highestThreatTarget = enemyBase != null
                ? enemyBase.GetHighestThreatTarget(currentRuntimeTarget, null, aggroRange)
                : null;

            if (IsValidHostileTarget(highestThreatTarget))
                return highestThreatTarget;

            return FindNearestLivingPlayer();
        }

        private GameObject ResolveMobilityTarget()
        {
            PlayerNetworkController[] players = Object.FindObjectsByType<PlayerNetworkController>(FindObjectsSortMode.None);
            if (players == null || players.Length == 0)
                return ResolvePrimaryTarget();

            GameObject primaryTarget = ResolvePrimaryTarget();
            GameObject farthestTarget = null;
            float farthestDistance = float.MinValue;
            float aggroRange = enemyBase != null && enemyBase.Data != null ? enemyBase.Data.AggroRange : Mathf.Infinity;

            for (int i = 0; i < players.Length; i++)
            {
                PlayerNetworkController player = players[i];
                if (player == null || player.IsDead || !player.gameObject.activeInHierarchy)
                    continue;

                GameObject candidate = player.gameObject;
                if (candidate == primaryTarget || !IsValidHostileTarget(candidate))
                    continue;

                float distance = TargetSurfaceUtility.GetHorizontalSurfaceDistance(transform.position, candidate);
                if (distance > aggroRange || distance <= farthestDistance)
                    continue;

                farthestDistance = distance;
                farthestTarget = candidate;
            }

            return farthestTarget != null ? farthestTarget : primaryTarget;
        }

        private GameObject ResolveJumpTarget()
        {
            GameObject resolvedTarget = IsValidJumpTarget(currentTarget) ? currentTarget : ResolvePatternTarget(currentPattern);
            currentTarget = resolvedTarget;
            runtimeState?.SetCurrentTarget(resolvedTarget);
            return resolvedTarget;
        }

        private GameObject FindNearestLivingPlayer()
        {
            PlayerNetworkController[] players = Object.FindObjectsByType<PlayerNetworkController>(FindObjectsSortMode.None);
            GameObject nearestTarget = null;
            float nearestDistance = float.MaxValue;
            float aggroRange = enemyBase != null && enemyBase.Data != null ? enemyBase.Data.AggroRange : Mathf.Infinity;

            for (int i = 0; i < players.Length; i++)
            {
                PlayerNetworkController player = players[i];
                if (player == null || player.IsDead || !player.gameObject.activeInHierarchy)
                    continue;

                GameObject candidate = player.gameObject;
                if (!IsValidHostileTarget(candidate))
                    continue;

                float distance = TargetSurfaceUtility.GetHorizontalSurfaceDistance(transform.position, candidate);
                if (distance > aggroRange || distance >= nearestDistance)
                    continue;

                nearestDistance = distance;
                nearestTarget = candidate;
            }

            return nearestTarget;
        }

        private bool IsValidHostileTarget(GameObject candidate)
        {
            if (candidate == null || !candidate.activeInHierarchy)
                return false;

            if (Team.IsSameTeam(gameObject, candidate))
                return false;

            IDamageable damageable = candidate.GetComponent<IDamageable>();
            return damageable == null || !damageable.IsDead;
        }

        private bool IsValidJumpTarget(GameObject candidate)
        {
            if (!IsValidHostileTarget(candidate))
                return false;

            float aggroRange = enemyBase != null && enemyBase.Data != null ? enemyBase.Data.AggroRange : 20f;
            float distance = TargetSurfaceUtility.GetHorizontalSurfaceDistance(transform.position, candidate);
            return distance <= aggroRange;
        }

        private void OnChargeDamageTaken(float damage)
        {
            if (damage <= 0f)
                return;

            chargeAccumulatedDamage += damage;
        }

        private void StopMovement()
        {
            if (navMeshAgent == null || !navMeshAgent.enabled)
                return;

            navMeshAgent.isStopped = true;
            navMeshAgent.ResetPath();
        }

        private void SetBehaviorGraphSuspended(bool suspended)
        {
            if (behaviorGraphAgent == null)
                return;

            if (suspended)
            {
                if (debugBehaviorGraphPaused)
                    return;

                debugBehaviorGraphPaused = true;
                restoreBehaviorGraphWhenDebugPauseEnds = behaviorGraphAgent.enabled;
                behaviorGraphAgent.End();

                if (restoreBehaviorGraphWhenDebugPauseEnds)
                    behaviorGraphAgent.enabled = false;

                return;
            }

            if (!debugBehaviorGraphPaused)
                return;

            debugBehaviorGraphPaused = false;
            if (!restoreBehaviorGraphWhenDebugPauseEnds)
                return;

            restoreBehaviorGraphWhenDebugPauseEnds = false;
            if (bossEnemy != null && !bossEnemy.IsDead && behaviorGraphAgent.Graph != null)
            {
                behaviorGraphAgent.enabled = true;
                behaviorGraphAgent.Restart();
            }
        }

        private void ResolveReferences()
        {
            if (bossEnemy == null)
                bossEnemy = GetComponent<BossEnemy>();

            if (enemyBase == null)
                enemyBase = GetComponent<EnemyBase>();

            if (skillController == null)
                skillController = GetComponent<SkillController>();

            if (runtimeState == null)
                runtimeState = GetComponent<BossBehaviorRuntimeState>();

            if (abnormalityManager == null)
                abnormalityManager = GetComponent<AbnormalityManager>();

            if (navMeshAgent == null)
                navMeshAgent = GetComponent<UnityEngine.AI.NavMeshAgent>();

            if (behaviorGraphAgent == null)
                behaviorGraphAgent = GetComponent<BehaviorGraphAgent>();
        }

        private void LogDebug(string message)
        {
            if (debugMode)
                Debug.Log($"[BossPatternDebugRunner] {message}", this);
        }
    }
}

#endif