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

namespace BaseGames.Enemies.Abilities
{
    /// <summary>
    /// 近战连击能力。
    /// 按 EnemyAbilitySO.attackSequence 顺序播放动画段，每段在 hitBoxEnterT~hitBoxExitT
    /// 之间激活对应槽位的 HitBox。
    ///
    /// 设计：HitBox 通过命名槽位绑定，避免对 EnemyCombat 的硬依赖；同一敌人多个近战
    /// 能力可共享同一 HitBox 槽位（如不同段使用同一把武器）。
    /// </summary>
    public sealed class MeleeAttackAbility : EnemyAbilityBase
    {
        [System.Serializable]
        public struct HitBoxSlot
        {
            public string slotName;
            public HitBox hitBox;
        }

        [Header("HitBox 槽位（按名字索引）")]
        [SerializeField] private HitBoxSlot[] _hitBoxSlots;

        [Header("行为")]
        [SerializeField] private bool _faceTargetOnStart = true;

        private Dictionary<string, HitBox> _slotMap;

        protected override void Awake()
        {
            base.Awake();
            _slotMap = new Dictionary<string, HitBox>(_hitBoxSlots?.Length ?? 0);
            if (_hitBoxSlots != null)
            {
                for (int i = 0; i < _hitBoxSlots.Length; i++)
                {
                    var s = _hitBoxSlots[i];
                    if (s.hitBox != null && !string.IsNullOrEmpty(s.slotName))
                        _slotMap[s.slotName] = s.hitBox;
                }
            }
        }

        protected override IEnumerator ExecuteCoroutine()
        {
            var seq = _config != null ? _config.attackSequence : null;
            if (seq == null || seq.Length == 0) yield break;

            if (_faceTargetOnStart && _enemy != null && _enemy.PlayerTransform != null)
                FaceTarget(_enemy.PlayerTransform);

            for (int i = 0; i < seq.Length; i++)
            {
                var atk = seq[i];
                if (atk == null) continue;
                yield return PlayAttackStep(atk);
                if (atk.postDelay > 0f)
                    yield return EnemyAbilityWaits.Get(atk.postDelay);
            }
        }

        private IEnumerator PlayAttackStep(EnemyAttackSO atk)
        {
            Phase = AbilityRunState.Active;

            float duration = atk.fallbackDuration;
            if (atk.clip != null && _animancer != null)
            {
                var state = _animancer.Play(atk.clip);
                if (state != null && state.Length > 0f) duration = state.Length;
            }

            HitBox hb = null;
            if (!string.IsNullOrEmpty(atk.hitBoxSlot))
                _slotMap.TryGetValue(atk.hitBoxSlot, out hb);

            float enterAbs = atk.hitBoxEnterT * duration;
            float exitAbs  = atk.hitBoxExitT  * duration;
            float t = 0f;
            bool active = false;

            while (t < duration)
            {
                t += Time.deltaTime;
                if (hb != null)
                {
                    if (!active && t >= enterAbs)
                    {
                        hb.Activate(atk.damageSource, _transform);
                        active = true;
                    }
                    else if (active && t >= exitAbs)
                    {
                        hb.Deactivate();
                        active = false;
                    }
                }
                yield return null;
            }

            if (active && hb != null) hb.Deactivate();
        }

        protected override void OnInterrupted(InterruptReason reason)
        {
            // 确保 HitBox 被关闭，防止中断时残留激活
            if (_hitBoxSlots == null) return;
            for (int i = 0; i < _hitBoxSlots.Length; i++)
            {
                var hb = _hitBoxSlots[i].hitBox;
                if (hb != null && hb.IsActive) hb.Deactivate();
            }
        }
    }
}