using UnityEngine;
using BaseGames.Parry;

namespace BaseGames.Combat
{
    /// <summary>
    /// 受击盒组件。实现完整 8 步伤害流水线（架构 06_CombatModule §5）。
    /// 挂载在角色根节点或指定子节点上，Collider2D 需设 IsTrigger = true，
    /// Layer = PlayerHurtBox 或 EnemyHurtBox。
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class HurtBox : MonoBehaviour
    {
        // ── 伤害接受方（Awake 注入）──────────────────────────────────────────
        private IDamageable      _owner;
        private IShieldable      _shieldable;       // 由 PlayerController.Awake() 注入
        private ParrySystem      _parrySystem;      // 由 PlayerController.Awake() 注入
        private IPoiseSource     _poiseSource;      // 由 EnemyBase.Awake() 注入
        private IStatusEffectable _statusEffectable; // Awake 缓存，避免每次受击调用 GetComponent

        private bool _isHurtBoxInvincible;
        private bool _isActive = true;

        // ── 事件频道 ──────────────────────────────────────────────────────────
        [SerializeField] private DamageInfoEventChannelSO   _onDamageDealt;
        [SerializeField] private HitConfirmedEventChannelSO _onHitConfirmed;

        // ── 注入接口 ──────────────────────────────────────────────────────────
        public void SetShieldable(IShieldable shieldable) => _shieldable  = shieldable;
        public void SetParrySystem(ParrySystem ps)        => _parrySystem  = ps;
        public void SetPoiseSource(IPoiseSource src)      => _poiseSource  = src;
        public void SetInvincible(bool value)             => _isHurtBoxInvincible = value;
        public void SetActive(bool value)                 => _isActive     = value;
#if UNITY_EDITOR
        // 付给编辑器的只读属性——避免反射并限制编辑器与运行时字段名耐合性。
        public object EditorOwner           => _owner;
        public object EditorShieldable      => _shieldable;
        public object EditorParrySystem     => _parrySystem;
        public object EditorPoiseSource     => _poiseSource;
        public object EditorStatusEffectable => _statusEffectable;
#endif
        private void Awake()
        {
            _owner = GetComponentInParent<IDamageable>();
            _statusEffectable = GetComponentInParent<IStatusEffectable>();
            if (_owner == null)
                Debug.LogWarning($"[HurtBox] {name}: 父节点中未找到 IDamageable 实现。", this);
        }

        /// <summary>
        /// 接受伤害（由 HitBox.OnTriggerEnter2D 直接调用）。
        /// ⚠️ 方法名必须为 ReceiveDamage。
        /// </summary>
        public void ReceiveDamage(DamageInfo info)
        {
            if (!_isActive || _owner == null) return;

            // 1. 无敌帧检查
            if ((_owner.IsInvincible || _isHurtBoxInvincible)
                && !info.Flags.HasFlag(DamageFlags.IgnoreIFrame)) return;

            // 2. 弹反检查（_parrySystem == null 时跳过）
            // ParrySystem 只暴露窗口状态，伤害数据留在 Combat 层，无跨程序集数据依赖。
            if (_parrySystem != null && info.Flags.HasFlag(DamageFlags.CanBeParried))
                if (_parrySystem.ConsumeParry()) return;

            // 3. 霸体检查（_poiseSource == null 时跳过）
            if (!info.Flags.HasFlag(DamageFlags.ForceBreak) && _poiseSource != null)
            {
                PoiseLevel curPoise = _poiseSource.GetCurrentPoiseLevel();
                if (curPoise == PoiseLevel.Unbreakable) return;
                if ((int)info.Break < (int)curPoise)
                {
                    _onHitConfirmed?.Raise(new HitInfo
                    {
                        DamageInfo = info,
                        HitPoint   = transform.position,
                    });
                    return;
                }
            }

            // 4. 护盾层拦截（玩家专属，在防御减免前）
            if (_shieldable != null && _shieldable.HasShield)
            {
                int passThrough = _shieldable.AbsorbDamage(info.Amount);
                if (passThrough <= 0) return;
                info.Amount = passThrough;
            }

            // 5. 计算 FinalDamage（防御减免，最低 1）
            int finalDamage  = UnityEngine.Mathf.Max(1, info.Amount - _owner.Defense);
            info.Amount      = finalDamage;
            info.FinalDamage = finalDamage;

            // 6. 调用 _owner.TakeDamage
            _owner.TakeDamage(info);

            // 7. 全局广播
            _onDamageDealt?.Raise(info);
            _onHitConfirmed?.Raise(new HitInfo
            {
                DamageInfo = info,
                HitPoint   = transform.position,
            });

            // 8. 状态效果触发（DoT — Fire / Poison）
            // _statusEffectable 已在 Awake 中缓存，无需每次受击调用 GetComponent
            _statusEffectable?.ApplyStatusEffect(info.Type);
        }

#if UNITY_EDITOR
        private void OnDrawGizmos()
        {
            var col = GetComponent<Collider2D>();
            if (col == null) return;
            // 激活时红色不透明，无敌/非激活时半透明
            Gizmos.color = (_isActive && !_isHurtBoxInvincible)
                ? new UnityEngine.Color(1f, 0f, 0f, 0.45f)
                : new UnityEngine.Color(1f, 0f, 0f, 0.1f);
            Gizmos.DrawCube(col.bounds.center, col.bounds.size);
            Gizmos.color = new UnityEngine.Color(1f, 0f, 0f, 0.9f);
            Gizmos.DrawWireCube(col.bounds.center, col.bounds.size);
        }
#endif
    }
}