using UnityEngine;
using BaseGames.Core.Events;
using BaseGames.Player;

namespace BaseGames.World
{
    /// <summary>
    /// 能力门禁（架构 09_ProgressionModule §2）。
    /// 使用 PlayerStats.HasAbility() 检测玩家是否持有所需能力；
    /// 订阅 AbilityTypeEventChannelSO 实时响应能力解锁事件。
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class AbilityGate : MonoBehaviour
    {
        [SerializeField] protected AbilityType _requiredAbility;
        [SerializeField] private   GameObject  _blockingObject;   // 关卡障碍物 GO（禁/启用）
        [SerializeField] private   GameObject  _hintUI;           // 提示 UI（能力图标 + "???"）
        [SerializeField] private   string      _gateId;           // 存档用（预留）

        [Header("引用")]
        [SerializeField] protected PlayerStats               _playerStats;       // Inspector 注入
        [SerializeField] private   AbilityTypeEventChannelSO _onAbilityUnlocked; // EVT_AbilityUnlocked

        private readonly CompositeDisposable _subs = new();

        /// <summary>子类可重写以实现额外通行条件检测。</summary>
        protected virtual bool EvaluateAccess()
            => _playerStats != null && _playerStats.HasAbility(_requiredAbility);

        private void Start()
        {
            ApplyState(EvaluateAccess());
        }

        private void OnEnable()
        {
            _onAbilityUnlocked?.Subscribe(OnAbilityUnlocked).AddTo(_subs);
        }

        private void OnDisable()
        {
            _subs.Clear();
        }

        private void OnAbilityUnlocked(AbilityType ability)
        {
            if (ability != _requiredAbility) return;
            ApplyState(true);
        }

        /// <summary>外部调用：强制开启门禁（不检查条件）。</summary>
        public void Open() => ApplyState(true);

        private void ApplyState(bool unlocked)
        {
            if (_blockingObject != null) _blockingObject.SetActive(!unlocked);
            if (_hintUI         != null) _hintUI.SetActive(!unlocked);
        }
    }
}