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

namespace BaseGames.World
{
    /// <summary>
    /// 房间/场景过渡触发器。玩家进入触发器或按交互键时，广播 <see cref="SceneLoadRequest"/>。
    /// <para>
    /// 通过 <see cref="_transitionType"/> 控制过渡演出：
    /// <list type="bullet">
    ///   <item><b>Room</b>：极短淡出，无加载画面，适合相邻房间边界。</item>
    ///   <item><b>Scene</b>：完整淡出 + 加载画面，适合大区域切换。</item>
    /// </list>
    /// 如需门动画，请改用 <see cref="DoorTransition"/> 组件，它会在动画完成后内部触发本组件。
    /// </para>
    /// </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("过渡类型")]
        [Tooltip("Seamless：无缝切换，流式系统标准选项，绝大多数房间门使用此类型。\n" +
                 "AtmosphericFade：短暂淡出 + 区域名提示，适合跨大区域边界。\n" +
                 "Room：极短淡出，不走流式系统（仅用于非流式独立场景切换）。\n" +
                 "Scene：完整淡出 + 加载画面，大区域/地图间传送专用。")]
        [SerializeField] private TransitionType _transitionType = TransitionType.Seamless;

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

        // ── IInteractable ─────────────────────────────────────────────────────
        public bool   CanInteract    => !_autoTrigger;
        public string InteractPrompt => _transitionType == TransitionType.Scene ? "前往下一区域" : "进入";

        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();
        }

        /// <summary>触发过渡。可由触发器、交互系统或 <see cref="DoorTransition"/> 调用。</summary>
        public void RequestTransition()
        {
            if (_requiresKeyItem && !HasItem(_requiredItemId)) return;

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

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

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

        /// <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，钥匙 {itemId} 检查跳过");
                return false;
            }
            return _worldState.IsCollected(itemId);
        }

        private void OnDrawGizmos()
        {
            var col = GetComponent<Collider2D>();
            if (col == null) return;
            Gizmos.color = _transitionType == TransitionType.Scene
                ? new Color(1f, 0.6f, 0f, 0.6f)   // 橙色：大区域切换
                : new Color(0f, 1f, 0.5f, 0.6f);   // 绿色：房间切换
            Gizmos.DrawWireCube(transform.position, col.bounds.size);
        }
    }
}