using UnityEngine;
using Animancer;
using BaseGames.Combat;
using BaseGames.Core.Events;
using BaseGames.Enemies.States;
#if GRAPH_DESIGNER
using Opsive.BehaviorDesigner.Runtime;
#endif

namespace BaseGames.Enemies
{
    /// <summary>
    /// 敌人基类（架构 07_EnemyModule §1）。
    /// 实现 IDamageable，为 Behavior Designer 任务提供统一虚方法接口。
    /// 包含：BD 接口、受击、死亡流程。
    /// ⚠️ _nav 字段类型为 IPathAgent（在 BaseGames.Enemies.Navigation 中实现具体类）。
    /// </summary>
    public class EnemyBase : MonoBehaviour, IDamageable, ILOSRequester
    {
        [Header("标识")]
        [SerializeField] private string _enemyId;    // 任务系统 / Boss 进程追踪用，如 "Enemy_SpiderGuard"
        public string EnemyId => _enemyId;

        /// <summary>死亡时触发（ChallengeRoomManager 波次结算用）。</summary>
        public event System.Action OnDied;

        [Header("配置 SO")]
        [SerializeField] protected EnemyStatsSO           _statsSO;
        [SerializeField] protected EnemyAnimationConfigSO _animConfig;

        [Header("子组件（Prefab Inspector 绑定）")]
        [SerializeField] protected EnemyStats       _stats;
        [SerializeField] protected EnemyMovement    _movement;
        [SerializeField] protected EnemyCombat      _combat;
        [SerializeField] protected AnimancerComponent _animancer;
        [SerializeField] protected EnemyFeedback    _feedback;
        [SerializeField] protected HurtBox          _hurtBox;

        [Header("事件频道")]
        [SerializeField] private BaseGames.Core.Events.StringEventChannelSO _onEnemyDied;
        /// <summary>
        /// 玩家生成事件频道（由 PlayerController.Start() 广播）。
        /// 配置后替代 FindWithTag，避免 N 个敌人同帧全场景标签扫描。
        /// </summary>
        [SerializeField] private BaseGames.Core.Events.TransformEventChannelSO _onPlayerSpawned;

        // ── 导航代理（IPathAgent；由 EnemyNavAgent 实现）───────────────────
        // 通过接口引用，避免对 Navigation 程序集的直接依赖。
        // 由子类 / Inspector 注入，或者运行时 GetComponent<IPathAgent>() 获取。
        protected IPathAgent  _nav;
        // 霸体来源（由 EnemyPoiseComponent.Awake() 自动注入，TakeDamage 时读取）
        private IPoiseSource _poiseSource;
        private readonly CompositeDisposable _subs = new();

        // ── 状态 ──────────────────────────────────────────────────────────
        private EnemyStateType _currentState;
        public EnemyStateType CurrentState => _currentState;
        // POCO 状态对象字典：枚举保持对外 API 不变。
        // 子类可在 Awake() 重写条目注入自定义状态对象。
        protected readonly System.Collections.Generic.Dictionary<EnemyStateType, IEnemyState> _stateObjs
            = new System.Collections.Generic.Dictionary<EnemyStateType, IEnemyState>();
        // ── IDamageable ───────────────────────────────────────────────────
        public bool IsAlive      => _currentState != EnemyStateType.Dead;
        public bool IsInvincible => _currentState == EnemyStateType.Dead;
        public int  Defense      => _stats != null ? _stats.Defense : 0;

        public void TakeDamage(DamageInfo info)
        {
            if (_currentState == EnemyStateType.Dead) return;

            _stats?.TakeDamage(info.FinalDamage);
            _feedback?.OnHit(info);

            if (_stats != null && _stats.CurrentHP <= 0)
            {
                Die();
                return;
            }

            // 根据霸体等级选择 Stagger（硬直）或 Hurt（受击）。
            // ForceBreak 标记或 BreakLevel 超过当前霸体等级时触发 Stagger，否则触发 Hurt。
            PoiseLevel curPoise = _poiseSource?.GetCurrentPoiseLevel() ?? PoiseLevel.None;
            bool causesStagger  = info.Flags.HasFlag(DamageFlags.ForceBreak)
                                  || (int)info.Break > (int)curPoise;
            ForceState(causesStagger ? EnemyStateType.Stagger : EnemyStateType.Hurt);
        }

        // BD 任务访问接口（公共只读属性）────────────────────────────────
        public IPathAgent              Nav             => _nav;
        public EnemyMovement           Movement        => _movement;
        public EnemyStats              Stats           => _stats;
        public AnimancerComponent      Animancer       => _animancer;
        public EnemyAnimationConfigSO  AnimConfig      => _animConfig;
        /// <summary>由 _onPlayerSpawned 事件缓存的玩家 Transform，供 BD 任务读取。</summary>
        public Transform               PlayerTransform => _playerTransform;
#if GRAPH_DESIGNER
    public BehaviorTree BehaviorTree => _behaviorTree;
#endif

        // ── BD 行为树接口（虚方法）────────────────────────────────────────

        public virtual void MoveTo(Vector2 target)
            => _nav?.RequestMoveTo(target);

        public virtual void MoveInDirection(float dir)
            => _movement?.MoveHorizontal(dir);

        public virtual void StopMovement()
        {
            _nav?.StopNavigation();
            _movement?.StopHorizontal();
        }

        public virtual void BeginAttack(AttackType type)
        {
            _combat?.StartAttack(type);
            _stats?.ResetAttackCooldown();
        }

        public virtual bool CanAttack()
            => _stats != null && _stats.AttackCooldownTimer <= 0f;

        public virtual bool IsPlayerInRange(float range)
            => _stats != null && _stats.SqrDistanceToPlayer <= range * range;

        public virtual bool IsPlayerVisible()
            => _losResult;   // BatchLOSSystem 写入；初始 false（未见玩家）

        public virtual void FacePlayer()
        {
            if (_playerTransform != null)
                _movement?.FaceTarget(_playerTransform.position);
        }

        public virtual void Knockback(DamageInfo info)
        {
            if (info.Flags.HasFlag(DamageFlags.NoKnockback)) return;
            _movement?.ApplyKnockback(info.KnockbackDirection, info.KnockbackForce);
        }

        public virtual void JumpTo(Vector2 target)
            => _movement?.JumpToTarget(target);

        /// <summary>
        /// 调整 BehaviorTree Tick 频率（非警觉=2帧/次，警觉=每帧）。
        /// 由 BD_SetAlert 调用（架构 07_EnemyModule §13.5）。
        /// </summary>
        public void SetAggroTickRate(bool isAggro)
        {
#if GRAPH_DESIGNER
            // Opsive 运行时当前版本未直接暴露 frameInterval 字段。
            // 需升级 Opsive 包或通过自定义 Tick 次数属性实现此功能。
            Debug.LogWarning("[EnemyBase] SetAggroTickRate 当前无效：Opsive 运行时尚未暴露 frameInterval，请升级包后实现。", this);
            _ = isAggro;
#endif
        }

        // ── 动画事件钩子（由 EnemyAnimationEvents 调用）────────────────────

        /// <summary>生成弹幕 / 技能投射物。payload 为配置 Id，由子类查表实现。</summary>
        public virtual void SpawnProjectile(string payload) { }

        /// <summary>切换二阶段形态（Boss 等特殊敌人重写此方法）。</summary>
        public virtual void TriggerPhaseTwo() { }

        /// <summary>动画播放完毕回调（用于单次动画后返回 Idle 等逻辑）。</summary>
        public virtual void OnAnimationComplete(string payload) { }

        /// <summary>设置嘶吼状态（影响 Blackboard / 状态机行为）。</summary>
        public virtual void SetRoaring(bool isRoaring) { }

        // ── 状态控制 ──────────────────────────────────────────────────────
        public void ForceState(EnemyStateType newState)
        {
            // Exit 当前状态
            if (_stateObjs.TryGetValue(_currentState, out var prev))
                prev.Exit(this);

            _currentState = newState;

            // Enter 新状态
            if (_stateObjs.TryGetValue(newState, out var next))
                next.Enter(this);
        }

        // ── Unity 生命周期 ────────────────────────────────────────────────
        protected virtual void Awake()
        {
            // 初始化 POCO 状态对象（子类可在调用 base.Awake() 后替换字典条目）
            _stateObjs[EnemyStateType.Controlled] = new EnemyControlledState();
            _stateObjs[EnemyStateType.Hurt]       = new EnemyHurtState();
            _stateObjs[EnemyStateType.Stagger]    = new EnemyStaggerState();
            _stateObjs[EnemyStateType.Dead]       = new EnemyDeadState();

            _nav          = GetComponent<IPathAgent>() ?? new NullPathAgent();
            _poiseSource  = GetComponent<IPoiseSource>();

            Debug.Assert(_statsSO != null, "[EnemyBase] _statsSO 未赋值，请在 Prefab Inspector 中指定 EnemyStatsSO。", this);
            Debug.Assert(_stats   != null, "[EnemyBase] _stats 未绑定，请在 Prefab Inspector 中绑定 EnemyStats 组件。", this);
            _stats.Initialize(_statsSO);

            // 订阅玩家生成事件（PlayerController.Start 广播），避免每个敌人独立 FindWithTag
            // 订阅在 OnEnable 中处理

#if GRAPH_DESIGNER
            _behaviorTree = GetComponent<BehaviorTree>();
            if (_behaviorTree != null)
            {
                _behaviorTree.StartWhenEnabled     = false;
                _behaviorTree.PauseWhenDisabled    = true;
                _behaviorTree.StartBehavior();
            }
#endif
        }

        protected virtual void Update()
        {
            _stats?.TickAttackCooldown(Time.deltaTime);

            // 使用 sqrMagnitude 替代 Vector2.Distance，避免每帧开平方计算
            if (_playerTransform != null && _stats != null)
                _stats.SqrDistanceToPlayer = ((Vector2)_playerTransform.position - (Vector2)transform.position).sqrMagnitude;
        }

        protected virtual void Start()
        {
            // 若事件未配置或玩家尚未广播，匹降为一次性查找
            if (_playerTransform == null)
            {
                var playerGO = GameObject.FindWithTag("Player");
                if (playerGO != null) _playerTransform = playerGO.transform;
            }

            // 播放 Idle 动画（若 Animancer 和配置都就绪）
            if (_animancer != null && _animConfig != null && _animConfig.Idle != null)
                _animancer.Play(_animConfig.Idle);
        }

        // ── 内部 ──────────────────────────────────────────────────────────
        protected Transform _playerTransform;
        private void SetPlayerTransform(Transform player) => _playerTransform = player;

        protected virtual void OnEnable()
        {
            _onPlayerSpawned?.Subscribe(SetPlayerTransform).AddTo(_subs);
        }

        protected virtual void OnDisable()
        {
            _subs.Clear();
        }

        protected virtual void OnDestroy() { }
        // LOS 缓存（BatchLOSSystem 写入；降级时由 3 帧节流 Raycast 写入）
        private bool _losResult;

        // ── ILOSRequester ──────────────────────────────────────────────────
        public Vector2   LOSOrigin       => (Vector2)transform.position + _statsSO.EyeOffset;
        public Vector2   LOSTarget       => _playerTransform != null
            ? (Vector2)_playerTransform.position
            : (Vector2)transform.position;
        public LayerMask LOSBlockingMask => _statsSO.LOSBlockingMask;

        public void ReceiveLOSResult(bool hasLineOfSight)
        {
            _losResult = hasLineOfSight;
        }

        // BehaviorTree 引用（#if GRAPH_DESIGNER 保护，避免空引用）
#if GRAPH_DESIGNER
    private BehaviorTree _behaviorTree;
#endif

        protected virtual void Die()
        {
            if (_currentState == EnemyStateType.Dead) return;
            ForceState(EnemyStateType.Dead);

            // 禁用所有碰撞体
            foreach (var col in GetComponentsInChildren<Collider2D>())
                col.enabled = false;

            // 播放死亡动画
            if (_animancer != null && _animConfig != null && _animConfig.Dead != null)
            {
                var state = _animancer.Play(_animConfig.Dead);
                state.Events(this).OnEnd = () => Destroy(gameObject);
            }
            else
            {
                Destroy(gameObject, 1.5f);
            }

            _feedback?.OnDeath();
            _onEnemyDied?.Raise(_enemyId);
            OnDied?.Invoke();
        }

        private void OnDrawGizmos()
        {
#if UNITY_EDITOR
            if (_statsSO == null) return;

            // ── 侦测范围（淡橙圆，始终可见）────────────────────────────
            Gizmos.color = new Color(1f, 0.6f, 0.1f, 0.18f);
            HitBox.DrawWireCircle2D(transform.position, _statsSO.DetectRange);

            // ── 攻击范围（淡红圆）───────────────────────────────────────
            Gizmos.color = new Color(1f, 0.15f, 0.15f, 0.22f);
            HitBox.DrawWireCircle2D(transform.position, _statsSO.AttackRange);

            // ── 运行时：LOS 连线 ────────────────────────────────────────
            if (!Application.isPlaying || _playerTransform == null) return;

            Vector3 eyeWorld  = transform.position + new Vector3(_statsSO.EyeOffset.x, _statsSO.EyeOffset.y, 0f);
            Vector3 playerPos = _playerTransform.position;
            float   sqrDist   = (playerPos - transform.position).sqrMagnitude;
            bool    inRange   = sqrDist <= _statsSO.DetectRange * _statsSO.DetectRange;

            // 眼睛位置小圆点（金黄）
            Gizmos.color = new Color(1f, 0.9f, 0.2f, 0.85f);
            HitBox.DrawWireCircle2D(eyeWorld, 0.07f, 8);

            if (inRange || _losResult)
            {
                // 有 LOS → 橙色实线；在范围内但遮挡 → 灰色虚感（透明度低）
                Gizmos.color = _losResult
                    ? new Color(1f, 0.5f, 0f, 0.85f)
                    : new Color(0.6f, 0.6f, 0.6f, 0.25f);
                Gizmos.DrawLine(eyeWorld, playerPos);
            }
#endif
        }

        private void OnDrawGizmosSelected()
        {
#if UNITY_EDITOR
            if (_statsSO == null) return;

            // 选中时加亮范围圆
            Gizmos.color = new Color(1f, 0.6f, 0.1f, 0.6f);
            HitBox.DrawWireCircle2D(transform.position, _statsSO.DetectRange);

            Gizmos.color = new Color(1f, 0.2f, 0.2f, 0.7f);
            HitBox.DrawWireCircle2D(transform.position, _statsSO.AttackRange);
#endif
        }
    }

    // ── 枚举（架构 07 §1）────────────────────────────────────────────────
    public enum EnemyStateType { Controlled, Hurt, Stagger, Dead }
    public enum AttackType     { Melee, Ranged, Special }
}