using System;
using System.Collections;
using Animancer;
using BaseGames.Combat;
using UnityEngine;

namespace BaseGames.Enemies.Behaviors
{
    /// <summary>
    /// 死亡前摇无敌演出（零代码替代每敌人专属的 <c>Die()</c> 重写）。
    /// <para>
    /// <see cref="EnemyBase.Die"/> 会委托本组件：停行为树 / 停移动、停用受击框，播放前摇动画并等待，
    /// 期间敌人处于无敌（<see cref="EnemyBase.IsInvincible"/>），演出结束后回调真正的死亡清理。
    /// 前摇动画上可放置 SpawnProjectile 动画事件，配合 <see cref="EnemySpawnerOnEvent"/> 在演出中生成小怪。
    /// </para>
    /// </summary>
    [DisallowMultipleComponent]
    public class EnemyDeathSequence : MonoBehaviour, IEnemyDeathSequence
    {
        [Header("前摇动画")]
        [Tooltip("死亡前摇动画（无敌演出）；为空则跳过演出直接进入死亡清理")]
        [SerializeField] private ClipTransition _deathPreClip;
        [Tooltip("前摇演出时长（秒）")]
        [Min(0f)][SerializeField] private float _duration = 3f;

        [Header("演出期间")]
        [Tooltip("演出期间停用的受击框（防止演出中被打断或二次受伤）；对象池复用时 OnSpawn 自动恢复")]
        [SerializeField] private HurtBox[] _hurtBoxesToDisable;
        [Tooltip("演出开始时停止行为树（防止 BT 继续 Tick 覆盖演出动画）")]
        [SerializeField] private bool _stopBehaviorTree = true;
        [Tooltip("演出开始时停止移动")]
        [SerializeField] private bool _stopMovement = true;

        private EnemyBase          _enemy;
        private AnimancerComponent _animancer;

        private void Awake()
        {
            _enemy     = GetComponentInParent<EnemyBase>();
            _animancer = _enemy != null ? _enemy.Animancer : GetComponentInParent<AnimancerComponent>();
            if (_enemy == null)
                Debug.LogError($"[EnemyDeathSequence] {name} 找不到 EnemyBase。", this);
        }

        // 对象池复用：出生时恢复受击框（演出中曾被停用）
        private void OnEnable()
        {
            if (_enemy != null) _enemy.Spawned += RestoreHurtBoxes;
        }

        private void OnDisable()
        {
            if (_enemy != null) _enemy.Spawned -= RestoreHurtBoxes;
        }

        public void Play(Action onComplete)
        {
            StartCoroutine(Sequence(onComplete));
        }

        private IEnumerator Sequence(Action onComplete)
        {
            if (_stopBehaviorTree) _enemy?.StopBehaviorTree();
            if (_stopMovement)     _enemy?.StopMovement();

            SetHurtBoxesEnabled(false);

            if (_deathPreClip.Clip != null && _animancer != null)
            {
                _animancer.Play(_deathPreClip);
                if (_duration > 0f) yield return new WaitForSeconds(_duration);
            }

            onComplete?.Invoke();
        }

        private void RestoreHurtBoxes() => SetHurtBoxesEnabled(true);

        private void SetHurtBoxesEnabled(bool enabled)
        {
            if (_hurtBoxesToDisable == null) return;
            foreach (var hb in _hurtBoxesToDisable)
                if (hb != null) hb.enabled = enabled;
        }
    }
}