using System.Collections;
using Animancer;
using BaseGames.Core;
using BaseGames.Core.Events;
using UnityEngine;

namespace BaseGames.World
{
    /// <summary>
    /// 门过渡组件。挂载在有物理门对象的 GameObject 上。
    /// <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="_openClip"/> 开门动画</item>
    ///   <item>动画完成后发出 <see cref="SceneLoadRequest"/>，类型由 <see cref="_transitionType"/> 决定</item>
    ///   <item>目标场景出生点侧的 <see cref="DoorTransition"/> 被 <see cref="PlayerSpawnPoint"/> 引用，
    ///     由外部调用 <see cref="PlayEnterAnimation"/> 播放玩家进入门的过渡动画</item>
    /// </list>
    /// </para>
    /// <para>
    /// 若不需要门动画，直接使用 <see cref="RoomTransition"/> 即可。
    /// </para>
    /// </summary>
    [RequireComponent(typeof(Collider2D))]
    public class DoorTransition : MonoBehaviour, IInteractable
    {
        [Header("目标")]
        [SerializeField] private string _targetSceneAddress;
        [SerializeField] private string _targetTransitionId;

        [Header("过渡类型")]
        [Tooltip("Room：极短淡出，无加载画面。\nScene：完整淡出 + 加载画面。")]
        [SerializeField] private TransitionType _transitionType = TransitionType.Room;

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

        [Header("门动画")]
        [SerializeField] private AnimancerComponent _animancer;

        [Tooltip("玩家从外侧进入时播放的开门动画（出口侧）。留空则跳过动画直接过渡。")]
        [SerializeField] private AnimationClip _openClip;

        [Tooltip("玩家从内侧走出时播放的动画（入口侧，由 PlayerSpawnPoint 在玩家出生后触发）。留空则跳过。")]
        [SerializeField] private AnimationClip _enterClip;

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

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

        private bool _triggered;

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

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

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

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

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

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

        private void TryTrigger()
        {
            if (_triggered) return;
            if (_requiresKeyItem && !HasItem(_requiredItemId)) return;
            _triggered = true;
            StartCoroutine(OpenAndTransition());
        }

        private void OnDisable() => _triggered = false;

        // ── 动画流程 ──────────────────────────────────────────────────────────

        private IEnumerator OpenAndTransition()
        {
            if (_animancer != null && _openClip != null)
            {
                var state = _animancer.Play(_openClip);
                yield return state;   // 等待动画完成
            }

            var request = new SceneLoadRequest
            {
                SceneName         = _targetSceneAddress,
                EntryTransitionId = _targetTransitionId,
                TransitionType    = _transitionType,
                IsRespawn         = false,
            };

            var sceneService = ServiceLocator.GetOrDefault<ISceneService>();
            if (sceneService != null)
            {
                sceneService.RequestTransition(request);
                yield break;
            }

            Debug.LogWarning("[DoorTransition] 无法发送过渡请求：ISceneService 未在 ServiceLocator 中注册。", this);
        }

        /// <summary>
        /// 玩家从门内侧走出时的动画（由出生点侧的 <see cref="PlayerSpawnPoint"/> 在玩家出生后调用）。
        /// 若未配置 <see cref="_enterClip"/> 则静默跳过。
        /// </summary>
        public void PlayEnterAnimation()
        {
            if (_animancer != null && _enterClip != null)
                _animancer.Play(_enterClip);
        }

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

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

        private void OnDrawGizmos()
        {
            var col = GetComponent<Collider2D>();
            if (col == null) return;
            // 紫色区分门过渡
            Gizmos.color = new Color(0.7f, 0.3f, 1f, 0.7f);
            Gizmos.DrawWireCube(transform.position, col.bounds.size);
            Gizmos.color = new Color(0.7f, 0.3f, 1f, 0.3f);
            Gizmos.DrawCube(transform.position, col.bounds.size);
        }
    }
}