using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(StatusEffectController))]
public class UnitBase : MonoBehaviour
{

    //移动速度
    public float speed = 5f;

    [Header("寻敌视野")]
    [Tooltip("检测范围内优先攻击敌方战斗单位；范围外则搜索敌方建筑物")]
    public float detectionRange = 25f;

    //攻击范围
    public float attackRange = 5f;

    //模型自身前方相对逻辑前方的水平修正角度。
    [Header("模型朝向修正")]
    public float modelFacingOffset = 0f;

    //基础攻击力，实际伤害结算逻辑后续接入
    [Min(0f)]
    public float attackPower = 10f;

    //完整攻击动作时长，单位为秒；设置为0时使用动画真实时长
    [Min(0f)]
    public float attackDuration = 0f;

    public enum AttackType
    {
        //近战锁定目标，攻击事件触发时直接扣血。
        MeleeDirect,

        //近战范围伤害，暂未实现。
        MeleeArea,

        //远程锁定目标，攻击事件触发时生成飞行物。
        RangedProjectile,

        //远程抛物线，不锁定目标，暂未实现。
        RangedArc
    }

    [Header("攻击类型")]
    public AttackType attackType = AttackType.MeleeDirect;

    [Header("远程飞行物")]
    public GameObject projectilePrefab;
    public Transform projectileSpawnPoint;
    [Min(0f)]
    public float projectileSpeed = 20f;
    [Min(0f)]
    public float projectileLifetime = 5f;

    //每次普通攻击命中后增加的技能能量。
    [Header("技能能量")]
    [Min(0f)]
    public float energyPerAttack = 20f;

    [Header("阵型分散")]
    [Min(0f)] public float targetSpreadBias = 6f;

    [Header("召唤师模式")]
    // 召唤师：不自动追击远处敌人，只在站定后攻击射程内的目标；移动由 SummonerClickMovement 控制。
    public bool summonerMode = false;

    //召唤师模式下允许自动攻击的开关（移动时由操控脚本关闭，站定时开启）。
    private bool summonerAttackEnabled = true;

    //角色状态
    private State state = State.Alert;

    //攻击目标
    public GameObject target;

    //出生使命：出生时快照当时己方标志指向的建筑，之后标志变化不影响本单位（支持分兵）。
    private GameObject missionTarget;

    // NavMesh 寻路更新间隔（优化性能）
    private float nextPathUpdateTime = 0f;
    private const float PathUpdateInterval = 0.5f; // 每 0.5 秒更新一次路径

    //动画控制器
    private Animator animator;

    // NavMesh 寻路代理（所有单位统一走 NavMesh 寻路）
    private UnityEngine.AI.NavMeshAgent navAgent;

    // 自身的血条组件，同时负责显示技能能量条。
    private WorldHealthBar worldHealthBar;

    // 通用状态效果组件。
    private StatusEffectController statusEffectController;

    // 攻击动画的有效经过时间；眩晕期间不增加。
    private float attackElapsedTime;

    private bool isPlayingSkill;
    private float attackSpeedMultiplier = 1f;
    private UnitSkill unitSkill;
    private System.Action skillFinishedCallback;


    //状态枚举
    public enum State
    {
        //警戒巡逻
        Alert,

        //追踪状态
        Track, 

        //攻击状态
        Attack,

        //技能状态
        Skill
    }






    // Start is called before the first frame update
    public void InitializeFromPlayerData(float health, float attack, float moveSpeed)
    {
        attackPower = attack;
        speed = moveSpeed;
        
        if (worldHealthBar == null)
        {
            worldHealthBar = GetComponent<WorldHealthBar>();
        }
        
        if (worldHealthBar != null)
        {
            worldHealthBar.maxHealth = health;
            worldHealthBar.currentHealth = health;
        }
    }

    void Start()
    {
        //初始化
        animator = GetComponent<Animator>();
        navAgent = GetComponent<UnityEngine.AI.NavMeshAgent>();
        worldHealthBar = GetComponent<WorldHealthBar>();
        statusEffectController = EnsureStatusEffectController();
        unitSkill = GetComponent<UnitSkill>();

        // 如果有 NavMeshAgent，配置它
        if (navAgent != null)
        {
            navAgent.speed = speed;
            navAgent.angularSpeed = 120f;
            navAgent.acceleration = 8f;
            navAgent.stoppingDistance = attackRange * 0.95f; // 接近攻击范围边缘时停止
            navAgent.autoBraking = true;

            // NavMesh 使用烘焙平面的高度，不能根据动画帧中的 Renderer 包围盒推算 baseOffset。
            navAgent.baseOffset = 0f;
        }

        // 根运动作用于所有动画：走路摇摆、攻击前冲由 OnAnimatorMove 统一协调
        animator.applyRootMotion = true;

        //出生使命：快照己方标志当前指向的建筑（之后玩家切换标志不影响本单位）
        var myTeam = GetComponent<UnitTeam>();
        if (myTeam != null && AttackTargetController.Instance != null)
        {
            missionTarget = AttackTargetController.Instance.GetTeamTarget(myTeam.teamId);
        }
    }

    private StatusEffectController EnsureStatusEffectController()
    {
        if (statusEffectController == null)
        {
            statusEffectController = GetComponent<StatusEffectController>();
        }

        if (statusEffectController == null)
        {
            statusEffectController = gameObject.AddComponent<StatusEffectController>();
        }

        return statusEffectController;
    }


    // Update is called once per frame
    void Update()
    {
        if (statusEffectController != null && statusEffectController.IsStunned)
        {
            animator.SetInteger("speed", 0);
            return;
        }

        //攻击状态下等待Animator报告攻击动画播放完成。
        if (state == State.Attack)
        {
            // 攻击时直接禁用 NavMeshAgent，彻底停止移动
            if (navAgent != null && navAgent.enabled)
            {
                navAgent.enabled = false;
            }

            animator.SetInteger("speed", 0);

            // 目标死亡、失活或离开攻击范围时，解除锁定并重新寻敌。
            if (!IsTargetValid(target) || !IsWithinAttackReach(target))
            {
                target = null;
                state = State.Alert;
                return;
            }

            attackElapsedTime += Time.deltaTime;
            CheckAttackAnimationFinished();
            return;
        }

        if (isPlayingSkill)
        {
            animator.SetInteger("speed", 0);
            CheckSkillAnimationFinished();
            return;
        }

        // 移动/追踪状态持续重新评估目标，确保相遇时能及时攻击敌方单位。
        // Attack 状态在上方单独处理，因此不会被这里打断或切换目标。
        target = FindTarget();

        if (target != null)
        {
            // 召唤师模式：不主动追击，站定且攻击开关开启时才攻击射程内目标。
            if (summonerMode)
            {
                if (!IsWithinAttackReach(target) || !summonerAttackEnabled)
                {
                    state = State.Alert;
                    // 动画由 SummonerClickMovement 控制，这里不设置
                    return;
                }
                attack(target);
                return;
            }

            state = State.Track;

            //目标在攻击范围外则朝目标移动，否则开始攻击
            if (!IsWithinAttackReach(target))
            {
                move(target.transform.position - transform.position);
            }
            else
            {
                attack(target);
            }

            return;
        }

        //场上没有敌人时进入待机，不再巡逻移动
        state = State.Alert;
        // 召唤师模式下动画由 SummonerClickMovement 控制（移动时 speed=1，站定后 speed=0）
        if (!summonerMode)
        {
            animator.SetInteger("speed", 0);
        }
    }

    public GameObject Target => target;

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

        WorldHealthBar healthBar = candidate.GetComponentInParent<WorldHealthBar>();
        if (healthBar != null && healthBar.IsDead)
        {
            return false;
        }

        UnitTeam myTeam = GetComponent<UnitTeam>();
        UnitTeam targetTeam = candidate.GetComponentInParent<UnitTeam>();
        return myTeam == null || targetTeam == null || myTeam.IsEnemy(targetTeam.gameObject);
    }

    public GameObject FindNearestEnemyForSkill()
    {
        return FindNearestEnemyUnit();
    }

    // 召唤师模式下控制"移动中不攻击"：移动时 false，站定后 true。
    public void SetSummonerAttackEnabled(bool enabled)
    {
        summonerAttackEnabled = enabled;
        if (!enabled && state == State.Track)
        {
            state = State.Alert;
        }
    }

    public float AttackSpeedMultiplier => attackSpeedMultiplier;

    public bool IsStunned => statusEffectController != null && statusEffectController.IsStunned;

    public void ApplyStun(float duration)
    {
        EnsureStatusEffectController().ApplyStun(duration);
    }

    public float ModifyIncomingDamage(float damage, GameObject attacker)
    {
        if (damage <= 0f)
        {
            return 0f;
        }

        if (unitSkill == null)
        {
            return damage;
        }

        return unitSkill.ModifyIncomingDamage(damage, attacker);
    }

    public bool ReceiveDamage(float damage, GameObject attacker = null)
    {
        WorldHealthBar healthBar = GetComponent<WorldHealthBar>();
        if (healthBar == null)
        {
            return false;
        }

        healthBar.TakeDamage(ModifyIncomingDamage(damage, attacker), attacker);
        return true;
    }

    //根运动协调（applyRootMotion=true 时由动画系统每帧回调）：
    //走路（agent 驱动）：只叠加动画的侧向摇摆和转身差量，前向分量丢弃（防双倍移速）；
    //攻击/技能（agent 已禁用）：root motion 全量生效（前冲、后撤、带位移的攻击动作）。
    private void OnAnimatorMove()
    {
        if (animator == null) return;

        Vector3 delta = animator.deltaPosition;
        delta.y = 0f;
        Quaternion yawDelta = Quaternion.Euler(0f, animator.deltaRotation.eulerAngles.y, 0f);

        if (navAgent != null && navAgent.enabled && navAgent.isOnNavMesh)
        {
            // 移动中：侧向分量（垂直于朝向）保留 = 大摇大摆的摇摆；同步 agent 位置防漂移
            if (delta.sqrMagnitude > 1e-10f)
            {
                Vector3 lateral = delta - Vector3.Project(delta, transform.forward);
                if (lateral.sqrMagnitude > 1e-10f)
                {
                    transform.position += lateral;
                    navAgent.nextPosition = transform.position;
                }
            }
        }
        else
        {
            // 攻击/技能/无 agent：根运动位移全量应用（垂直分量丢弃，防漂离地面）
            if (delta.sqrMagnitude > 1e-10f)
            {
                transform.position += delta;
            }
        }

        // 朝向：root 旋转差量叠加（身体摇摆、攻击转身）
        transform.rotation *= yawDelta;
    }

    private void LateUpdate()
    {
    }

    //目标决策：周围有敌人打敌人（detectionRange 内），否则直奔出生使命建筑（快照，标志变化不影响）。
    private GameObject FindTarget()
    {
        // Phase 1: detectionRange 内的敌方战斗单位
        GameObject enemy = FindNearestEnemyUnit();
        if (enemy != null) return enemy;

        // Phase 2: 出生使命建筑；只有仍属于敌方的使命建筑才继续攻击。
        if (IsTargetValid(missionTarget))
        {
            return missionTarget;
        }

        // 使命建筑已被己方占领、失活或销毁时，改攻敌方主城堡。
        var myTeam = GetComponent<UnitTeam>();
        if (myTeam != null && AttackTargetController.Instance != null)
        {
            GameObject castle = AttackTargetController.Instance.GetEnemyCastleOfTeam(myTeam.teamId);
            missionTarget = castle;
            return castle;
        }
        return null;
    }

    //判断建筑是否我方阵营（含主城堡和已占领资源建筑）
    private bool IsFriendlyBuilding(GameObject building)
    {
        var myTeam = GetComponent<UnitTeam>();
        var buildingTeam = building.GetComponent<UnitTeam>();
        return myTeam != null && buildingTeam != null && buildingTeam.teamId == myTeam.teamId;
    }

    //查找 detectionRange 内最近的敌方战斗单位
    private GameObject FindNearestEnemyUnit()
    {
        var myTeam = GetComponent<UnitTeam>();
        if (myTeam == null)
        {
            Debug.LogWarning($"{gameObject.name} 缺少 UnitTeam 组件，无法查找敌人");
            return null;
        }

        Vector3 myPos = transform.position;

        // Phase 1: detectionRange 内的敌方战斗单位
        GameObject nearestUnit = null;
        float nearestUnitSqr = float.PositiveInfinity;

        UnitTeam[] allTeams = FindObjectsOfType<UnitTeam>();
        foreach (var unit in allTeams)
        {
            if (unit.gameObject == gameObject || !myTeam.IsEnemy(unit.gameObject))
                continue;
            if (unit.transform.root == transform.root)
                continue;
            // 跳过建筑物（它们有 Building Tag），只找战斗单位
            if (unit.CompareTag("Building"))
                continue;

            float sqrDist = (unit.transform.position - myPos).sqrMagnitude;
            if (sqrDist > detectionRange * detectionRange)
                continue;

            float bias = ((uint)(gameObject.GetInstanceID() * 7919) ^ (uint)(unit.gameObject.GetInstanceID())) % 10u / 10f * targetSpreadBias;
            float adjusted = sqrDist + bias;
            if (adjusted < nearestUnitSqr)
            {
                nearestUnitSqr = adjusted;
                nearestUnit = unit.gameObject;
            }
        }

        if (nearestUnit != null)
            return nearestUnit;

        return null;
    }

    //判断是否进入可攻击距离
    private bool IsWithinAttackReach(GameObject opponent)
    {
        if (opponent == null)
        {
            return false;
        }

        float distance = Vector3.Distance(transform.position, opponent.transform.position);
        float buffer = 1.5f;

        // 建筑目标：中心在模型内部，用碰撞体最近点计算到建筑表面的精确距离，缓冲小让单位贴近
        if (opponent.CompareTag("Building"))
        {
            buffer = 0.2f;
            var col = opponent.GetComponentInChildren<Collider>();
            if (col != null)
            {
                Vector3 closest = col.ClosestPoint(transform.position);
                Vector3 flat = closest - transform.position;
                flat.y = 0f; // 忽略高度差，只算水平距离
                distance = flat.magnitude;
            }
        }

        // 攻击状态下增加容差，避免目标轻微移动导致状态频繁切换
        if (state == State.Attack)
        {
            buffer += 1.0f;
        }

        // NavMeshAgent 会保持一定距离，所以增加额外的攻击范围缓冲
        return distance <= attackRange + buffer;
    }

    //查找当前Animator中使用的攻击动画时长
    private float GetAttackAnimationDuration()
    {
        if (animator == null || animator.runtimeAnimatorController == null)
        {
            return 0f;
        }

        var overrideController = animator.runtimeAnimatorController as AnimatorOverrideController;
        if (overrideController != null)
        {
            var overrides = new List<KeyValuePair<AnimationClip, AnimationClip>>();
            overrideController.GetOverrides(overrides);

            foreach (var pair in overrides)
            {
                if (IsAttackAnimation(pair.Key))
                {
                    return pair.Value != null ? pair.Value.length : pair.Key.length;
                }
            }
        }

        foreach (var clip in animator.runtimeAnimatorController.animationClips)
        {
            if (IsAttackAnimation(clip))
            {
                return clip.length;
            }
        }

        return 0f;
    }

    // 查找当前 Animator 中使用的技能动画时长。
    private float GetSkillAnimationDuration()
    {
        if (animator == null || animator.runtimeAnimatorController == null)
        {
            return 0f;
        }

        var overrideController = animator.runtimeAnimatorController as AnimatorOverrideController;
        if (overrideController != null)
        {
            var overrides = new List<KeyValuePair<AnimationClip, AnimationClip>>();
            overrideController.GetOverrides(overrides);

            foreach (var pair in overrides)
            {
                if (IsSkillAnimation(pair.Key))
                {
                    return pair.Value != null ? pair.Value.length : pair.Key.length;
                }
            }
        }

        foreach (var clip in animator.runtimeAnimatorController.animationClips)
        {
            if (IsSkillAnimation(clip))
            {
                return clip.length;
            }
        }

        return 0f;
    }

    // 根据动画名称判断是否为技能动画。
    private bool IsSkillAnimation(AnimationClip clip)
    {
        if (clip == null)
        {
            return false;
        }

        string clipName = clip.name.ToLowerInvariant();
        return clipName.Contains("skill")
            || clipName.Contains("技能");
    }

    //根据动画名称判断是否为攻击动画
    private bool IsAttackAnimation(AnimationClip clip)
    {
        if (clip == null)
        {
            return false;
        }

        string clipName = clip.name.ToLowerInvariant();
        return clipName.Contains("attack")
            || clipName.Contains("攻击")
            || clipName.Contains("挥剑");
    }

    //设置攻击动画播放速度
    private void SetAttackAnimationSpeed()
    {
        float animationDuration = GetAttackAnimationDuration();
        if (animationDuration <= 0f || attackDuration <= 0f)
        {
            animator.speed = attackSpeedMultiplier;
            return;
        }

        animator.speed = animationDuration / attackDuration * attackSpeedMultiplier;
    }

    //攻击
    private void attack(GameObject friend)
    {
        target = friend;

        // 攻击时直接禁用 NavMeshAgent（彻底停止移动）
        if (navAgent != null && navAgent.enabled)
        {
            navAgent.enabled = false;
        }

        FaceTarget(friend);

        if (TryReleaseSkill())
        {
            return;
        }

        //根据目标攻击时长加速或减速完整攻击动画
        SetAttackAnimationSpeed();

        animator.SetInteger("speed", 0);
        animator.SetTrigger("attack");
        state = State.Attack;
        attackElapsedTime = 0f;
    }

    private void FaceTarget(GameObject opponent)
    {
        FaceTarget(opponent, modelFacingOffset);
    }

    private void FaceTarget(GameObject opponent, float facingOffset)
    {
        if (opponent == null)
        {
            return;
        }

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

        ApplyFacingRotation(direction, facingOffset);
    }

    public void FaceCurrentTarget()
    {
        FaceTarget(target);
    }

    public void FaceCurrentTarget(float facingOffset)
    {
        FaceTarget(target, facingOffset);
    }

    private bool TryReleaseSkill()
    {
        if (worldHealthBar == null
            || !worldHealthBar.IsEnergyFull
            || unitSkill == null
            || target == null
            || !target.activeInHierarchy)
        {
            return false;
        }

        worldHealthBar.ResetEnergy();
        state = State.Alert;
        animator.SetInteger("speed", 0);
        unitSkill.ReleaseSkill();
        return true;
    }

    private void ApplyFacingRotation(Vector3 direction, float facingOffset)
    {
        direction.y = 0f;
        if (direction.sqrMagnitude <= 0.0001f)
        {
            return;
        }

        Quaternion targetRotation = Quaternion.LookRotation(direction, Vector3.up);
        transform.rotation = Quaternion.Euler(
            0f,
            targetRotation.eulerAngles.y + facingOffset,
            0f);
    }

    //由攻击动画中最合适的帧通过 Animation Event 调用。
    public void OnAttackEffect()
    {
        if (IsStunned || state != State.Attack || target == null)
        {
            return;
        }

        switch (attackType)
        {
            case AttackType.MeleeDirect:
                ApplyDirectDamage(target);
                break;
            case AttackType.RangedProjectile:
                FireProjectile(target);
                break;
            case AttackType.MeleeArea:
            case AttackType.RangedArc:
                break;
        }
    }

    private void ApplyDirectDamage(GameObject opponent)
    {
        UnitBase targetUnit = opponent.GetComponentInParent<UnitBase>();
        if (targetUnit != null && targetUnit.ReceiveDamage(attackPower, gameObject))
        {
            RegisterAttackHit();
            return;
        }

        CrystalMineCapture targetCrystalMine = opponent.GetComponentInParent<CrystalMineCapture>();
        if (targetCrystalMine != null && targetCrystalMine.ReceiveCaptureDamage(attackPower, gameObject))
        {
            RegisterAttackHit();
            return;
        }

        BuildingHealth targetBuilding = opponent.GetComponentInParent<BuildingHealth>();
        if (targetBuilding != null && targetBuilding.ReceiveDamage(attackPower, gameObject))
        {
            RegisterAttackHit();
            return;
        }
        
        // 召唤师等特殊单位（有 WorldHealthBar 但没有 UnitBase）
        WorldHealthBar targetHealthBar = opponent.GetComponentInParent<WorldHealthBar>();
        if (targetHealthBar != null)
        {
            targetHealthBar.TakeDamage(attackPower, gameObject);
            RegisterAttackHit();
        }
    }

    public void ApplySkillHit(float damageMultiplier, bool registerEnergy)
    {
        if (IsStunned || target == null)
        {
            return;
        }

        float damage = attackPower * Mathf.Max(0f, damageMultiplier);
        UnitBase targetUnit = target.GetComponentInParent<UnitBase>();
        bool hit = targetUnit != null && targetUnit.ReceiveDamage(damage, gameObject);

        if (!hit)
        {
            CrystalMineCapture targetCrystalMine = target.GetComponentInParent<CrystalMineCapture>();
            hit = targetCrystalMine != null && targetCrystalMine.ReceiveCaptureDamage(damage, gameObject);
        }

        if (!hit)
        {
            BuildingHealth targetBuilding = target.GetComponentInParent<BuildingHealth>();
            hit = targetBuilding != null && targetBuilding.ReceiveDamage(damage, gameObject);
        }

        if (!hit)
        {
            return;
        }

        if (registerEnergy)
        {
            RegisterAttackHit();
        }
    }

    public void ApplyAreaSkillDamage(float radius, float damage, bool registerEnergy)
    {
        if (worldHealthBar == null || damage <= 0f)
        {
            return;
        }

        UnitTeam myTeam = GetComponent<UnitTeam>();
        if (myTeam == null)
        {
            return;
        }

        float clampedRadius = Mathf.Max(0f, radius);
        float radiusSquared = clampedRadius * clampedRadius;
        
        // 查找所有带 UnitTeam 的对象（包括单位和召唤师）
        UnitTeam[] allTeams = FindObjectsOfType<UnitTeam>();
        HashSet<WorldHealthBar> hitHealthBars = new HashSet<WorldHealthBar>();

        foreach (UnitTeam targetTeam in allTeams)
        {
            GameObject opponent = targetTeam.gameObject;
            
            if (opponent == null || opponent == gameObject || opponent.transform.root == transform.root)
            {
                continue;
            }
            
            // 检查是否是敌人
            if (!myTeam.IsEnemy(opponent))
            {
                continue;
            }

            Vector3 offset = opponent.transform.position - transform.position;
            offset.y = 0f;
            if (offset.sqrMagnitude > radiusSquared)
            {
                continue;
            }

            UnitBase targetUnit = opponent.GetComponentInParent<UnitBase>();
            BuildingHealth targetBuilding = opponent.GetComponentInParent<BuildingHealth>();
            WorldHealthBar healthBar = null;
            
            if (targetUnit != null)
            {
                healthBar = targetUnit.GetComponent<WorldHealthBar>();
            }
            else if (targetBuilding != null)
            {
                healthBar = targetBuilding.GetComponent<WorldHealthBar>();
            }
            else
            {
                // 召唤师等特殊单位（有 WorldHealthBar 但没有 UnitBase）
                healthBar = opponent.GetComponentInParent<WorldHealthBar>();
            }

            if (healthBar == null || !hitHealthBars.Add(healthBar))
            {
                continue;
            }

            if (targetUnit != null)
            {
                targetUnit.ReceiveDamage(damage, gameObject);
            }
            else if (targetBuilding != null)
            {
                targetBuilding.ReceiveDamage(damage, gameObject);
            }
            else if (healthBar != null)
            {
                // 召唤师等特殊单位
                healthBar.TakeDamage(damage, gameObject);
            }
        }

        if (registerEnergy)
        {
            RegisterAttackHit();
        }
    }

    public void ApplyAreaStun(float radius, float duration)
    {
        if (duration <= 0f)
        {
            return;
        }

        UnitTeam myTeam = GetComponent<UnitTeam>();
        if (myTeam == null)
        {
            return;
        }

        float clampedRadius = Mathf.Max(0f, radius);
        float radiusSquared = clampedRadius * clampedRadius;
        
        // 查找所有带 UnitTeam 的对象（包括单位和召唤师）
        UnitTeam[] allTeams = FindObjectsOfType<UnitTeam>();
        HashSet<UnitBase> hitUnits = new HashSet<UnitBase>();

        foreach (UnitTeam targetTeam in allTeams)
        {
            GameObject opponent = targetTeam.gameObject;
            
            if (opponent == null || opponent == gameObject || opponent.transform.root == transform.root)
            {
                continue;
            }
            
            // 检查是否是敌人
            if (!myTeam.IsEnemy(opponent))
            {
                continue;
            }

            Vector3 offset = opponent.transform.position - transform.position;
            offset.y = 0f;
            if (offset.sqrMagnitude > radiusSquared)
            {
                continue;
            }

            UnitBase unit = opponent.GetComponentInParent<UnitBase>();
            if (unit != null && hitUnits.Add(unit))
            {
                unit.ApplyStun(duration);
                continue;
            }
            
            // 召唤师等特殊单位（有 StatusEffectController 但没有 UnitBase）
            StatusEffectController statusEffect = opponent.GetComponentInParent<StatusEffectController>();
            if (statusEffect != null)
            {
                statusEffect.ApplyStun(duration);
            }
        }
    }

    public void RegisterAttackHit()
    {
        if (IsStunned)
        {
            return;
        }

        AddAttackEnergy();
    }

    private void FireProjectile(GameObject opponent)
    {
        if (projectilePrefab == null || projectileSpawnPoint == null)
        {
            return;
        }

        GameObject projectileObject = Instantiate(
            projectilePrefab,
            projectileSpawnPoint.position,
            Quaternion.identity);
        Projectile projectile = projectileObject.GetComponent<Projectile>();
        if (projectile != null)
        {
            projectile.Initialize(opponent, attackPower, gameObject, projectileSpeed, projectileLifetime);
        }
    }

    public void FireSkillProjectile(GameObject opponent)
    {
        FireSkillProjectile(opponent, 1f);
    }

    public void FireSkillProjectile(GameObject opponent, float damageMultiplier)
    {
        if (opponent == null || projectilePrefab == null || projectileSpawnPoint == null)
        {
            return;
        }

        GameObject projectileObject = Instantiate(
            projectilePrefab,
            projectileSpawnPoint.position,
            Quaternion.identity);
        Projectile projectile = projectileObject.GetComponent<Projectile>();
        if (projectile != null)
        {
            // 技能箭不再次积攒能量，避免技能触发递归。
            projectile.Initialize(opponent, attackPower * Mathf.Max(0f, damageMultiplier), gameObject, projectileSpeed, projectileLifetime, false);
        }
    }

    // 普通攻击命中后只积攒能量，大招在下一次普攻开始前释放。
    private void AddAttackEnergy()
    {
        if (worldHealthBar == null || energyPerAttack <= 0f)
        {
            return;
        }

        worldHealthBar.AddEnergy(energyPerAttack);
    }

    private float GetSkillAnimationSpeed(float targetDuration)
    {
        float animationDuration = GetSkillAnimationDuration();
        if (animationDuration <= 0f || targetDuration <= 0f)
        {
            return 1f;
        }

        return animationDuration / targetDuration;
    }

    public void PlaySkillAnimation(System.Action onFinished, float targetDuration = 0f)
    {
        if (isPlayingSkill)
        {
            return;
        }

        skillFinishedCallback = onFinished;
        isPlayingSkill = true;
        state = State.Skill;
        animator.speed = GetSkillAnimationSpeed(targetDuration);
        animator.SetInteger("speed", 0);
        animator.SetTrigger("skill");
    }

    public void MultiplyAttackSpeed(float multiplier, float limit)
    {
        attackSpeedMultiplier = Mathf.Min(
            attackSpeedMultiplier * multiplier,
            limit);
        animator.speed = attackSpeedMultiplier;
    }

    private void CheckSkillAnimationFinished()
    {
        AnimatorStateInfo stateInfo = animator.GetCurrentAnimatorStateInfo(0);
        if (!stateInfo.IsName("skill") || stateInfo.normalizedTime < 1f)
        {
            return;
        }

        isPlayingSkill = false;
        state = State.Alert;
        animator.speed = attackSpeedMultiplier;
        skillFinishedCallback?.Invoke();
        skillFinishedCallback = null;
    }


    // 根据当前攻击动画的播放进度自动结束攻击，不依赖 Animation Event。
    private void CheckAttackAnimationFinished()
    {
        float animationDuration = attackDuration > 0f
            ? attackDuration
            : GetAttackAnimationDuration();

        if (animationDuration > 0f && attackElapsedTime >= animationDuration)
        {
            FinishAttack();
            return;
        }

        if (!IsPlayingAttackAnimation())
        {
            return;
        }

        AnimatorStateInfo stateInfo = animator.GetCurrentAnimatorStateInfo(0);
        if (stateInfo.normalizedTime >= 1f)
        {
            FinishAttack();
        }
    }

    private bool IsPlayingAttackAnimation()
    {
        AnimatorClipInfo[] clipInfos = animator.GetCurrentAnimatorClipInfo(0);
        foreach (AnimatorClipInfo clipInfo in clipInfos)
        {
            if (IsAttackAnimation(clipInfo.clip))
            {
                return true;
            }
        }

        return false;
    }

    private void FinishAttack()
    {
        //攻击动画结束后恢复当前攻速倍率。
        animator.speed = attackSpeedMultiplier;

        //攻击结束后只继续攻击当前锁定目标，不在这里重新寻敌。
        if (IsTargetValid(target) && IsWithinAttackReach(target))
        {
            FaceTarget(target);
            attack(target);
            return;
        }

        //目标失效或离开攻击范围，解除锁定，下一帧重新寻敌。
        target = null;
        state = State.Alert;
        animator.SetInteger("speed", 0);
    }

    //角色移动,持续到目标点
    void move(Vector3 movement)
    {
        movement.y = 0;

        if (navAgent == null) return;

        // 重新启用 NavMeshAgent（攻击后可能被禁用）
        if (!navAgent.enabled)
        {
            navAgent.enabled = true;
        }

        if (!navAgent.isOnNavMesh) return;

        // 确保没有被停止
        if (navAgent.isStopped)
        {
            navAgent.isStopped = false;
        }

        // 限制寻路更新频率（性能优化）
        if (Time.time >= nextPathUpdateTime)
        {
            // 设置目标位置（相对于当前位置）
            Vector3 targetPosition = transform.position + movement.normalized * 10f;
            navAgent.SetDestination(targetPosition);
            nextPathUpdateTime = Time.time + PathUpdateInterval;
        }

        // 根据速度设置动画
        if (navAgent.velocity.magnitude > 0.1f)
        {
            animator.SetInteger("speed", 1);
        }
        else
        {
            animator.SetInteger("speed", 0);
        }
    }

    // 在 Scene 视图中标记箭的发射位置和方向，便于调整空物体。
    private void OnDrawGizmos()
    {
        if (projectileSpawnPoint == null)
        {
            return;
        }

        Vector3 position = projectileSpawnPoint.position;
        Gizmos.color = Color.cyan;
        Gizmos.DrawWireSphere(position, 0.08f);
        Gizmos.DrawLine(position, position + projectileSpawnPoint.forward * 0.4f);

        Gizmos.color = Color.green;
        Gizmos.DrawLine(position, position + projectileSpawnPoint.up * 0.15f);
    }
}