using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.UI;

public class UIItem : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler, IPointerEnterHandler, IPointerExitHandler
{
    public bool NoBag;
    private RectTransform rectTransform;
    public string ItemName = "";

    public int Count = 1;
    private bool canDrag;

    public void OnBeginDrag(PointerEventData eventData)
    {
        if (ItemName != "")
        {
            RemainsKind kind = BagControl.Instance.bag.GetRemainsItem(ItemName).kind;
            if (kind == RemainsKind.YishiRemains)
            {
                canDrag = true;
                rectTransform = BagControl.Instance.ChangeDragUI(ItemName);
                rectTransform.anchoredPosition = eventData.position;
            }
            else if (kind == RemainsKind.ScreeenRemains)
            {

                if (ItemName == "太阳神之眼")
                {
                    GameObject obj = Instantiate(BagControl.Instance.bag.SunRemains);
                    obj.name = ItemName;
                }
                else
                {
                    GameObject obj = Instantiate(BagControl.Instance.bag.OtherRemains);
                    obj.name = ItemName;
                    obj.GetComponent<BuildRemains>().ChangeRemainskind(ItemName);
                    // obj.GetComponent<SpriteRenderer>().sprite = transform.GetComponent<Image>().sprite;
                }
                BagControl.Instance.CloseBagTwo();
                BagControl.Instance.bag.CutItems(ItemName);
                BagControl.Instance.Refresh();
            }
        }
    }
    public void OnDrag(PointerEventData eventData)
    {
        if (canDrag)
        {
            rectTransform.anchoredPosition = eventData.position;
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        if (canDrag)
        {
            YishiRemainsEvent(eventData);
            canDrag = false;
            rectTransform.gameObject.SetActive(false);
        }


    }
    public void YishiRemainsEvent(PointerEventData eventData) //仪式遗物
    {
        // 发射一条射线检测鼠标下的第一个UI
        RaycastResult result = RaycastUI(eventData);
        // 检测UI元素的tag
        if (result.gameObject != null && result.gameObject.CompareTag("bagitem"))  // 替换 "YourTargetTag" 为你想要检测的 tag
        {
            if (result.gameObject.TryGetComponent(out UIItem UiItem))
            {
                if (UiItem != this)//不等于自身
                {
                    if (NoBag)//自身不是背包
                    {
                        if (!UiItem.NoBag)//是背包item
                        {
                            if (UiItem.ItemName == ItemName || UiItem.ItemName == "" || BagControl.Instance.bag.GetRemainsItem(UiItem.ItemName).kind != RemainsKind.YishiRemains)//两种类相同(合并)或者item为空
                            {
                                BagControl.Instance.RemoveIn(ItemName);//移入背包
                                Refresh();
                            }
                            else
                            {
                                BagControl.Instance.RemoveIn(ItemName);//先移入背包
                                BagControl.Instance.RemoveOut(UiItem.ItemName);//再移出背包
                                ItemName = UiItem.ItemName;
                                GetUI();
                            }

                        }
                        else//两个都可交互(都不为背包item)
                        {
                            if (UiItem.ItemName == "")
                            {
                                UiItem.ItemName = ItemName;
                                Refresh();
                                UiItem.GetUI();
                            }
                            else
                            {
                                ExChange(UiItem);//交换
                            }

                        }

                    }
                    else//自身是背包
                    {
                        if (UiItem.NoBag)//另一个不是背包
                        {
                            if (UiItem.ItemName == "")//空的,
                            {
                                Debug.LogWarning("背包，不是背包" + ItemName);
                                string name = ItemName;
                                BagControl.Instance.RemoveOut(ItemName);//直接移出包
                                UiItem.ItemName = name;
                                UiItem.GetUI();
                            }
                            else//不为空,也需交换
                            {
                                string name = ItemName;
                                BagControl.Instance.RemoveIn(UiItem.ItemName);//移入背包
                                BagControl.Instance.RemoveOut(ItemName);
                                UiItem.ItemName = ItemName;
                                UiItem.GetUI();
                            }
                        }
                    }
                    BagControl.Instance.Refresh();
                    YiShiUI.Instance.PrayerText();
                }
            }
        }
    }
    private RaycastResult RaycastUI(PointerEventData eventData)
    {

        // 存储射线结果
        List<RaycastResult> results = new List<RaycastResult>();

        // 创建射线检测器，找到与鼠标位置相交的UI元素
        GraphicRaycaster raycaster = BagControl.Instance.graphicRaycaster;  // 获取当前Canvas上的GraphicRaycaster

        if (raycaster != null)
        {
            Debug.LogWarning("---射线检测没问题-");
            raycaster.Raycast(eventData, results);
            Debug.LogWarning(results.Count > 0);
            if (results.Count > 0)
            {
                Debug.LogWarning(results[0].gameObject.name);
            }
        }
        else
        {
            Debug.LogWarning("---射线检测有问题-");
        }

        // 返回列表的第一个元素，如果没有元素则返回空的RaycastResult
        return results.Count > 0 ? results[0] : new RaycastResult();
    }

    public void Refresh()
    {
        transform.GetComponent<Image>().sprite = BagControl.Instance.Blocksprite;
        transform.Find("数量/Text").GetComponent<Text>().text = "";
        ItemName = "";
    }

    public void GetUI()
    {
        transform.GetComponent<Image>().sprite = BagControl.Instance.bag.GetSprite(ItemName);

        transform.Find("数量/Text").GetComponent<Text>().text = Count.ToString();
    }

    public void AwkaeItem(string name, int count)
    {
        ItemName = name;
        Count = count;
        GetUI();
    }
    /// <summary>
    /// 交换
    /// </summary>
    private void ExChange(UIItem uIItem)
    {
        string Aitemname = ItemName;
        ItemName = uIItem.ItemName;
        uIItem.ItemName = Aitemname;
        GetUI();
        uIItem.GetUI();
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        BagControl.Instance.MiaosuRemains(ItemName);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        BagControl.Instance.MiaosuRemains("");
    }
}