using BaseGames.Core.Events;
using UnityEngine;

namespace BaseGames.World
{
    /// <summary>
    /// 房间传送点。玩家进入触发器或按交互键时，广播 <see cref="SceneLoadRequest"/>，
    /// 由 SceneLoader 监听并执行 Additive 场景加载/卸载。
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class RoomTransition : MonoBehaviour, IInteractable
    {
        [Header("本传送门标识")]
        [SerializeField] private string _transitionId;         // 本出口唯一 ID（供 SceneLoader 写入复活点）

        [Header("目标")]
        [SerializeField] private string _targetSceneAddress;   // Addressable key（目标场景）
        [SerializeField] private string _targetTransitionId;   // 目标房间出生点 ID

        [Header("触发方式")]
        [SerializeField] private bool _autoTrigger = true;     // true = 玩家进入触发器自动触发

        [Header("钥匙物品校验")]
        [SerializeField] private bool   _requiresKeyItem;      // 是否需要持有指定钥匙物品
        [SerializeField] private string _requiredItemId;       // 钥匙物品 ID（_requiresKeyItem = true 时生效）

        [Header("事件频道")]
        [SerializeField] private SceneLoadRequestEventChannelSO _onSceneLoadRequest;

        [Header("世界状态")]
        [SerializeField] private WorldStateRegistry _worldState;

        // ── IInteractable ─────────────────────────────────────────────────────
        public bool   CanInteract    => !_autoTrigger;
        public string InteractPrompt => "前往下一区域";

        public void Interact(Transform player) => RequestTransition();

        public void OnPlayerEnterRange(Transform player) { }
        public void OnPlayerExitRange() { }

        // ── Auto Trigger ──────────────────────────────────────────────────────
        private void OnTriggerEnter2D(Collider2D other)
        {
            if (!_autoTrigger) return;
            if (!other.CompareTag("Player")) return;
            RequestTransition();
        }

        private void RequestTransition()
        {
            if (_requiresKeyItem && !HasItem(_requiredItemId)) return;

            _onSceneLoadRequest?.Raise(new SceneLoadRequest
            {
                SceneName         = _targetSceneAddress,
                EntryTransitionId = _targetTransitionId,
                ShowLoadingScreen = true,
                IsRespawn         = false,
            });
        }

        /// <summary>检查玩家是否持有指定物品（通过 WorldStateRegistry.IsCollected 检查）。</summary>
        private bool HasItem(string itemId)
        {
            if (string.IsNullOrEmpty(itemId)) return true;
            if (_worldState == null)
            {
                Debug.LogWarning($"[RoomTransition] WorldStateRegistry 未配置，销 {itemId} 检查跳过");
                return false;
            }
            return _worldState.IsCollected(itemId);
        }

        private void OnDrawGizmos()
        {
            Gizmos.color = new Color(0f, 1f, 0.5f, 0.6f);
            var col = GetComponent<Collider2D>();
            if (col != null)
                Gizmos.DrawWireCube(transform.position, col.bounds.size);
        }
    }
}