using UnityEngine;

using Unity.Netcode;

using Colosseum.Abnormalities;
using Colosseum.Skills;

namespace Colosseum.Player
{
    /// <summary>
    /// 플레이어의 피격 제어 상태를 관리합니다.
    /// 경직, 넉백, 다운 상태와 피격 애니메이션 재생을 담당합니다.
    /// </summary>
    [DisallowMultipleComponent]
    [RequireComponent(typeof(PlayerMovement))]
    public class HitReactionController : NetworkBehaviour
    {
        [Header("References")]
        [Tooltip("플레이어 이동 컴포넌트")]
        [SerializeField] private PlayerMovement playerMovement;

        [Tooltip("스킬 실행 관리자")]
        [SerializeField] private SkillController skillController;

        [Tooltip("플레이어 네트워크 상태")]
        [SerializeField] private PlayerNetworkController networkController;

        [Tooltip("이상상태 관리자")]
        [SerializeField] private AbnormalityManager abnormalityManager;

        [Tooltip("피격 애니메이션을 재생할 Animator")]
        [SerializeField] private Animator animator;

        [Header("Animation")]
        [Tooltip("일반 피격 트리거 이름")]
        [SerializeField] private string hitTriggerParam = "Hit";

        [Tooltip("일반 피격 애니메이션 속도 배율 파라미터 이름")]
        [SerializeField] private string hitSpeedMultiplierParam = "HitSpeedMultiplier";

        [Tooltip("다운 시작 트리거 이름")]
        [SerializeField] private string downTriggerParam = "Down";

        [Tooltip("기상 트리거 이름")]
        [SerializeField] private string recoverTriggerParam = "Recover";

        [Header("Settings")]
        [Tooltip("DownBegin 종료 후 구르기 가능 구간까지 대기 시간")]
        [Min(0f)] [SerializeField] private float downRecoverableDelayAfterBeginExit = 0.2f;

        [Tooltip("애니메이션 파라미터가 없을 때 경고 로그 출력")]
        [SerializeField] private bool logMissingAnimationParams = false;

        private readonly NetworkVariable<bool> isDowned = new NetworkVariable<bool>(false);
        private readonly NetworkVariable<bool> isDownRecoverable = new NetworkVariable<bool>(false);
        private readonly NetworkVariable<bool> isKnockbackActive = new NetworkVariable<bool>(false);
        private readonly NetworkVariable<bool> isStaggered = new NetworkVariable<bool>(false);

        private float downRemainingTime;
        private float downRecoverableDelayRemaining = -1f;
        private float knockbackRemainingTime;
        private float staggerRemainingTime;
        private bool isDownRecoveryAnimating;
        private bool isDownLoopTimingActive;

        /// <summary>
        /// 다운 상태 여부
        /// </summary>
        public bool IsDowned => isDowned.Value;

        /// <summary>
        /// 다운 중 구르기 가능 구간 여부
        /// </summary>
        public bool IsDownRecoverable => isDownRecoverable.Value;

        /// <summary>
        /// 넉백 강제 이동 진행 여부
        /// </summary>
        public bool IsKnockbackActive => isKnockbackActive.Value;

        /// <summary>
        /// 경직 상태 여부
        /// </summary>
        public bool IsStaggered => isStaggered.Value;

        /// <summary>
        /// 경직 면역 상태 여부
        /// </summary>
        public bool IsStaggerImmune => abnormalityManager != null && abnormalityManager.IsStaggerImmune;

        /// <summary>
        /// 넉백 면역 상태 여부
        /// </summary>
        public bool IsKnockbackImmune => abnormalityManager != null && abnormalityManager.IsKnockbackImmune;

        /// <summary>
        /// 다운 면역 상태 여부
        /// </summary>
        public bool IsDownImmune => abnormalityManager != null && abnormalityManager.IsDownImmune;

        private void Awake()
        {
            ResolveReferences();
        }

        public override void OnNetworkSpawn()
        {
            ResolveReferences();
        }

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

            UpdateKnockbackState(Time.deltaTime);
            UpdateStaggerState(Time.deltaTime);
            UpdateDownState(Time.deltaTime);
        }

        /// <summary>
        /// 경직을 적용합니다.
        /// </summary>
        public void ApplyStagger(float duration, bool playHitAnimation = true, float hitAnimationSpeedMultiplier = 1f)
        {
            if (!IsServer)
                return;

            ResolveReferences();

            if (networkController != null && networkController.IsDead)
                return;

            if (IsStaggerImmune || isDowned.Value)
                return;

            if (duration <= 0f)
            {
                ClearStaggerState();
                return;
            }

            staggerRemainingTime = Mathf.Max(staggerRemainingTime, duration);
            isStaggered.Value = true;
            skillController?.CancelSkill(SkillCancelReason.Stagger);

            if (playHitAnimation)
            {
                TriggerAnimationRpc(hitTriggerParam, hitAnimationSpeedMultiplier);
            }
        }

        /// <summary>
        /// 넉백을 적용합니다.
        /// </summary>
        public void ApplyKnockback(Vector3 worldVelocity, float duration, bool playHitAnimation = true, float hitAnimationSpeedMultiplier = 1f)
        {
            if (!IsServer)
                return;

            ResolveReferences();

            if (networkController != null && networkController.IsDead)
                return;

            if (IsKnockbackImmune || isDowned.Value)
                return;

            if (duration <= 0f || worldVelocity.sqrMagnitude <= 0.0001f)
            {
                ClearKnockbackState();
                playerMovement?.ClearForcedMovement();
                return;
            }

            knockbackRemainingTime = Mathf.Max(knockbackRemainingTime, duration);
            isKnockbackActive.Value = true;
            skillController?.CancelSkill(SkillCancelReason.HitReaction);
            playerMovement?.ApplyForcedMovement(worldVelocity, duration);

            if (playHitAnimation)
            {
                TriggerAnimationRpc(hitTriggerParam, hitAnimationSpeedMultiplier);
            }
        }

        /// <summary>
        /// 다운 상태를 적용합니다.
        /// </summary>
        public void ApplyDown(float duration)
        {
            if (!IsServer)
                return;

            ResolveReferences();

            if (networkController != null && networkController.IsDead)
                return;

            if (IsDownImmune)
                return;

            downRemainingTime = Mathf.Max(downRemainingTime, duration);

            if (isDowned.Value)
                return;

            isDowned.Value = true;
            isDownRecoverable.Value = false;
            isDownRecoveryAnimating = false;
            isDownLoopTimingActive = false;
            downRecoverableDelayRemaining = -1f;
            ClearKnockbackState();
            ClearStaggerState();
            skillController?.CancelSkill(SkillCancelReason.HitReaction);
            playerMovement?.ClearForcedMovement();
            TriggerAnimationRpc(downTriggerParam);
        }

        /// <summary>
        /// DownBegin 종료 시점을 전달받아 구르기 가능 타이머를 시작합니다.
        /// </summary>
        public void NotifyDownBeginExited()
        {
            if (!IsServer || !isDowned.Value || isDownRecoveryAnimating)
                return;

            isDownLoopTimingActive = true;
            downRecoverableDelayRemaining = downRecoverableDelayAfterBeginExit;
        }

        /// <summary>
        /// Recover 상태가 끝났을 때 다운 상태를 최종 해제합니다.
        /// </summary>
        public void NotifyDownRecoverAnimationExited()
        {
            if (!IsServer || !isDowned.Value || !isDownRecoveryAnimating)
                return;

            ClearDownState();
        }

        /// <summary>
        /// 다운 회복 가능 구간에서 구르기를 사용하며 다운 상태를 종료합니다.
        /// </summary>
        public bool TryConsumeDownRecoverableEvade()
        {
            if (!IsServer || !isDowned.Value || !isDownRecoverable.Value)
                return false;

            ClearDownState();
            return true;
        }

        /// <summary>
        /// 피격 상태를 즉시 초기화합니다.
        /// </summary>
        public void ClearHitReactionState(bool playRecoverAnimation = false)
        {
            if (!IsServer)
                return;

            ResolveReferences();

            playerMovement?.ClearForcedMovement();
            ClearKnockbackState();
            ClearStaggerState();

            if (!isDowned.Value)
                return;

            ClearDownState();

            if (playRecoverAnimation)
            {
                TriggerAnimationRpc(recoverTriggerParam);
            }
        }

        [Rpc(SendTo.Everyone)]
        private void TriggerAnimationRpc(string triggerName, float hitAnimationSpeedMultiplier = 1f)
        {
            ResolveReferences();

            if (animator == null || string.IsNullOrWhiteSpace(triggerName))
                return;

            if (triggerName == hitTriggerParam)
            {
                SetFloatParameterIfExists(hitSpeedMultiplierParam, Mathf.Max(0.01f, hitAnimationSpeedMultiplier));
            }

            if (!HasTrigger(triggerName))
            {
                if (logMissingAnimationParams)
                {
                    Debug.LogWarning($"[HitReaction] Animator trigger not found: {triggerName}");
                }
                return;
            }

            animator.SetTrigger(triggerName);
        }

        private void SetFloatParameterIfExists(string parameterName, float value)
        {
            if (animator == null || string.IsNullOrWhiteSpace(parameterName))
                return;

            for (int i = 0; i < animator.parameterCount; i++)
            {
                AnimatorControllerParameter parameter = animator.GetParameter(i);
                if (parameter.type == AnimatorControllerParameterType.Float && parameter.name == parameterName)
                {
                    animator.SetFloat(parameterName, value);
                    return;
                }
            }

            if (logMissingAnimationParams)
            {
                Debug.LogWarning($"[HitReaction] Animator float parameter not found: {parameterName}");
            }
        }

        private bool HasTrigger(string triggerName)
        {
            if (animator == null || string.IsNullOrWhiteSpace(triggerName))
                return false;

            for (int i = 0; i < animator.parameterCount; i++)
            {
                AnimatorControllerParameter parameter = animator.GetParameter(i);
                if (parameter.type == AnimatorControllerParameterType.Trigger && parameter.name == triggerName)
                    return true;
            }

            return false;
        }

        private void ResolveReferences()
        {
            if (playerMovement == null)
                playerMovement = GetComponent<PlayerMovement>();

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

            if (networkController == null)
                networkController = GetComponent<PlayerNetworkController>();

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

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

        private void UpdateKnockbackState(float deltaTime)
        {
            if (!isKnockbackActive.Value)
                return;

            knockbackRemainingTime -= deltaTime;
            if (knockbackRemainingTime <= 0f)
            {
                ClearKnockbackState();
            }
        }

        private void UpdateStaggerState(float deltaTime)
        {
            if (!isStaggered.Value)
                return;

            staggerRemainingTime -= deltaTime;
            if (staggerRemainingTime <= 0f)
            {
                ClearStaggerState();
            }
        }

        private void UpdateDownState(float deltaTime)
        {
            if (!isDowned.Value)
                return;

            if (isDownLoopTimingActive)
            {
                downRemainingTime -= deltaTime;
            }

            if (!isDownRecoverable.Value && downRecoverableDelayRemaining >= 0f)
            {
                downRecoverableDelayRemaining -= deltaTime;
                if (downRecoverableDelayRemaining <= 0f)
                {
                    EnterDownRecoverableState();
                }
            }

            if (downRemainingTime <= 0f)
            {
                BeginDownRecoveryAnimation();
            }
        }

        private void EnterDownRecoverableState()
        {
            if (!isDowned.Value)
                return;

            isDownRecoverable.Value = true;
            downRecoverableDelayRemaining = -1f;
        }

        private void BeginDownRecoveryAnimation()
        {
            if (!isDowned.Value || isDownRecoveryAnimating)
                return;

            EnterDownRecoverableState();
            isDownRecoveryAnimating = true;
            isDownLoopTimingActive = false;
            downRemainingTime = 0f;
            TriggerAnimationRpc(recoverTriggerParam);
        }

        private void ClearDownState()
        {
            isDowned.Value = false;
            isDownRecoverable.Value = false;
            isDownRecoveryAnimating = false;
            isDownLoopTimingActive = false;
            downRemainingTime = 0f;
            downRecoverableDelayRemaining = -1f;
        }

        private void ClearKnockbackState()
        {
            isKnockbackActive.Value = false;
            knockbackRemainingTime = 0f;
        }

        private void ClearStaggerState()
        {
            isStaggered.Value = false;
            staggerRemainingTime = 0f;
        }
    }
}