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

namespace Studio
{
    public class UI_DragDrop_ : MonoBehaviour,IBeginDragHandler,IDragHandler,IEndDragHandler,IDropHandler
    {
        GameObject Clone;
        public float cloneAlpha=1f;
        public Action<UIBase, UIBase> OnDropItem;
        public void OnBeginDrag(PointerEventData eventData)
        {
            Clone=Instantiate(gameObject,gameObject.transform.parent);
            Clone.GetComponent<CanvasGroup>().blocksRaycasts = false;
            var CI = Clone.GetComponentsInChildren<Image>();
            foreach(var c in CI)
            {
                c.color = new Color(c.color.r, c.color.g, c.color.b, cloneAlpha);
            }
        }
        public void OnDrag(PointerEventData eventData)
        {
            Clone.transform.position = Input.mousePosition;
        }
        public void OnEndDrag(PointerEventData eventData)
        {
            Destroy(Clone);
        }

        public void OnDrop(PointerEventData eventData)
        {
            if (eventData.pointerDrag != null)
            {
                UI_DragDrop_ draggedItem = eventData.pointerDrag.GetComponent<UI_DragDrop_>();
                if (draggedItem)
                {
                    OnDropItem?.Invoke(gameObject.GetComponent<UIBase>(), draggedItem.GetComponent<UIBase>());
                }
            }
        }
    }
}