using System.Collections;
using BaseGames.Feedback;
using BaseGames.Player;
using UnityEngine;

namespace BaseGames.World
{
    /// <summary>
    /// 同场景成对门传送组件。两扇门互相引用，玩家进入其中一扇门时被传送到另一扇。
    /// <para>
    /// 触发流程：
    /// <list type="number">
    ///   <item>玩家进入触发器或按交互键 → 播放 <see cref="_transitionOut"/> 转场反馈（淡出）</item>
    ///   <item>等待反馈完成后传送玩家到 <see cref="_linkedDoor"/> 的 <see cref="_spawnPoint"/> 位置，并设定朝向</item>
    ///   <item>播放 <see cref="_linkedDoor"/> 的 <see cref="_transitionIn"/> 转场反馈（淡入），目标门进入冷却</item>
    /// </list>
    /// </para>
    /// <para>不涉及场景加载；适用于同房间内不同小区域之间的传送门、电梯、秘道等。</para>
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class LinkedDoorTransition : MonoBehaviour, IInteractable
    {
        [Header("配对")]
        [Tooltip("与此门配对的另一扇门。玩家进入本门后传送到此目标门的出生点。")]
        [SerializeField] private LinkedDoorTransition _linkedDoor;

        [Header("出生配置")]
        [Tooltip("传送到此门后玩家的出生位置。拖动场景中的子节点 SpawnPoint 来调整。\n为空时回退到 GameObject 中心。")]
        [SerializeField] private Transform _spawnPoint;

        [Tooltip("传送到此门后玩家的朝向（+1 = 朝右，-1 = 朝左）。")]
        [SerializeField] private int _facingDirectionOnArrive = 1;

        [Header("触发方式")]
        [Tooltip("true = 玩家进入触发器自动触发；false = 需玩家按交互键。")]
        [SerializeField] private bool _autoTrigger = false;

        [Header("转场反馈")]
        [Tooltip("传送前播放（淡出）。留空则跳过，直接传送。")]
        [SerializeField] private SceneFeedback _transitionOut;

        [Tooltip("传送后播放（淡入）。留空则跳过。由目标门在玩家到达后自动播放。")]
        [SerializeField] private SceneFeedback _transitionIn;

        [Header("钥匙物品校验")]
        [SerializeField] private bool   _requiresKeyItem;
        [SerializeField] private string _requiredItemId;

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

        [Header("冷却")]
        [Tooltip("传送完成后本门的冷却时间（秒）。防止玩家被反复来回传送。")]
        [SerializeField] private float _cooldown = 1.5f;

        private bool  _triggered;
        private float _cooldownUntil;

        // ── IInteractable ─────────────────────────────────────────────────────

        public bool   CanInteract    => !_autoTrigger;
        public string InteractPrompt => "进入";

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

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

        // ── 触发 ──────────────────────────────────────────────────────────────

        private void OnTriggerEnter2D(Collider2D other)
        {
            if (!_autoTrigger) return;
            if (!other.CompareTag("Player")) return;
            TryTrigger(other.transform);
        }

        private void TryTrigger(Transform player)
        {
            if (_triggered) return;
            if (Time.time < _cooldownUntil) return;
            if (_linkedDoor == null)
            {
                Debug.LogWarning($"[LinkedDoorTransition] {name}：未配置 _linkedDoor，传送中止。");
                return;
            }
            if (_requiresKeyItem && !HasItem(_requiredItemId)) return;

            _triggered = true;
            StartCoroutine(TransitionCoroutine(player));
        }

        private void OnDisable() => _triggered = false;

        // ── 传送流程 ──────────────────────────────────────────────────────────

        private IEnumerator TransitionCoroutine(Transform player)
        {
            // 1. 淡出
            if (_transitionOut != null)
                yield return _transitionOut.PlayAndWait();

            // 2. 传送
            player.position = _linkedDoor.GetSpawnWorldPosition();

            // 通过 PlayerMovement 设定朝向（同步清零速度，防止旧速度覆盖朝向）
            var movement = player.GetComponentInChildren<PlayerMovement>()
                        ?? player.GetComponent<PlayerMovement>();
            if (movement != null)
                movement.SetFacingImmediate(_linkedDoor._facingDirectionOnArrive);

            // 4. 淡入（目标门播放）+ 冷却
            _linkedDoor.PlayTransitionIn();
            _linkedDoor.StartCooldown(_cooldown);

            _triggered = false;
        }

        /// <summary>播放此门的淡入反馈。由传送发起方在玩家到达后调用。</summary>
        public void PlayTransitionIn() => _transitionIn?.Play();

        /// <summary>启动传送冷却，在此期间本门不会再次触发传送。</summary>
        public void StartCooldown(float duration) => _cooldownUntil = Time.time + duration;

        // ── 辅助 ──────────────────────────────────────────────────────────────

        /// <summary>返回传送目标位置。优先使用 _spawnPoint 子节点，否则回退到门中心。</summary>
        public Vector3 GetSpawnWorldPosition()
            => _spawnPoint != null ? _spawnPoint.position : transform.position;

        private bool HasItem(string itemId)
        {
            if (string.IsNullOrEmpty(itemId)) return true;
            if (_worldState == null)
            {
                Debug.LogWarning($"[LinkedDoorTransition] WorldStateRegistry 未配置，钥匙 {itemId} 检查跳过");
                return false;
            }
            return _worldState.IsCollected(itemId);
        }

        // ── Gizmos ────────────────────────────────────────────────────────────

#if UNITY_EDITOR
        private void OnDrawGizmos()
        {
            var col = GetComponent<Collider2D>();

            if (col != null)
            {
                Gizmos.color = new Color(0.2f, 0.9f, 0.9f, 0.7f);
                Gizmos.DrawWireCube(col.bounds.center, col.bounds.size);
                Gizmos.color = new Color(0.2f, 0.9f, 0.9f, 0.15f);
                Gizmos.DrawCube(col.bounds.center, col.bounds.size);
            }

            Vector3 spawn = GetSpawnWorldPosition();
            Gizmos.color = Color.cyan;
            Gizmos.DrawWireSphere(spawn, 0.2f);

            if (_linkedDoor != null)
            {
                Gizmos.color = new Color(0.2f, 0.9f, 0.9f, 0.8f);
                Gizmos.DrawLine(spawn, _linkedDoor.GetSpawnWorldPosition());
            }

            Vector3 labelPos = col != null
                ? col.bounds.center + Vector3.up * (col.bounds.extents.y + 0.3f)
                : transform.position + Vector3.up * 1.5f;

            string facing      = _facingDirectionOnArrive >= 0 ? "→" : "←";
            string trigger     = _autoTrigger ? "Auto" : "Interact";
            string linkName    = _linkedDoor != null ? _linkedDoor.name : "未配对";
            string keyInfo     = _requiresKeyItem ? $" 🔑{_requiredItemId}" : "";
            string grandparent = transform.parent != null ? $"[{transform.parent.name}]  " : "";
            string label       = $"{grandparent}{name}\n→ {linkName}  |  {trigger}  |  到达朝向:{facing}{keyInfo}";

            UnityEditor.Handles.color = Color.white;
            UnityEditor.Handles.Label(labelPos, label);
        }
#endif
    }
}