using UnityEngine;
using Inventory;
using DG.Tweening; // 引入 DOTween
using Project.Interaction;

public class HandController : MonoBehaviour
{
    [Header("配置")]
    [Tooltip("拖入摄像机下的 HandHolder 物体")]
    public Transform handPosition;
    
    [Tooltip("切换物品的动画时长")]
    public float animationDuration = 0.25f;
    
    [Tooltip("物品收起时的位移偏移量")]
    public Vector3 hiddenOffset = new Vector3(0, -1.0f, 0);

    private GameObject currentModel;
    private Tween currentTween; // 记录当前的动画，防止冲突

    // 供外部调用：切换物品
    public void EquipItem(ItemData item)
    {
        // 如果正在播放动画，先杀掉
        if (currentTween != null && currentTween.IsActive()) currentTween.Kill();

        // 1. 如果手里有东西，先收起来
        if (currentModel != null)
        {
            // 向下移动，并在完成后销毁
            currentModel.transform.DOLocalMove(hiddenOffset, animationDuration)
                .SetEase(Ease.InBack) // 回收时用 InBack 更有感觉
                .OnComplete(() =>
                {
                    Destroy(currentModel);
                    currentModel = null;
                    // 旧的收完了，再生成新的
                    SpawnNewItem(item);
                });
        }
        else
        {
            // 手里本来就是空的，直接生成新的
            SpawnNewItem(item);
        }
    }

    private void SpawnNewItem(ItemData item)
    {
        if (item == null || item.handModelPrefab == null) return;

        // 生成新模型
        currentModel = Instantiate(item.handModelPrefab, handPosition);
        
        // 自动清理物理组件（防止手持物品掉落或把玩家挤飞）
        // 1. 关闭 Rigidbody 物理影响
        Rigidbody rb = currentModel.GetComponent<Rigidbody>();
        ItemPhysicsState physicsState = currentModel.GetComponent<ItemPhysicsState>();
        if (rb != null)
        {
            if (physicsState != null)
            {
                Debug.LogWarning($"{nameof(HandController)} 检测到手持模型带有 {nameof(ItemPhysicsState)}（通常依赖 Rigidbody）。已保留 Rigidbody 并关闭其物理影响，避免运行时报错。", currentModel);
                physicsState.enabled = false;
            }

            rb.isKinematic = true;
            rb.useGravity = false;
            rb.detectCollisions = false;
            rb.velocity = Vector3.zero;
            rb.angularVelocity = Vector3.zero;
        }

        // 2. 禁用所有 Collider
        Collider[] cols = currentModel.GetComponentsInChildren<Collider>();
        foreach (var c in cols) c.enabled = false;

        // 3. (可选) 将层级设置为 "Player" 或 "Weapon" 防止穿模，如果需要的话
        // SetLayerRecursively(currentModel, LayerMask.NameToLayer("FirstPerson"));

        // 初始位置设在“下面”
        Vector3 targetPos = Vector3.zero;
        Quaternion targetRot = Quaternion.identity;
        Vector3 targetScale = Vector3.one;

        if (item.useCustomHoldSettings)
        {
            targetPos = item.holdPositionOffset;
            targetRot = Quaternion.Euler(item.holdRotationOffset);
            targetScale = item.holdScale;
        }

        currentModel.transform.localScale = targetScale;
        currentModel.transform.localPosition = hiddenOffset; // 依然从隐藏位置开始
        currentModel.transform.localRotation = targetRot;

        // 2. 播放“掏出来”动画
        currentTween = currentModel.transform.DOLocalMove(targetPos, animationDuration)
            .SetEase(Ease.OutBack); // 掏出时用 OutBack 有一种弹出来的动感
    }
}