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

public class DragWindowUI : MonoBehaviour, IDragHandler, IBeginDragHandler, IEndDragHandler, IPointerDownHandler
{
    private RectTransform dragRectTransform;
    private Canvas canvas;
    private Image backgroundImage;
    private Color backgroundColor;

    public void OnBeginDrag(PointerEventData eventData)
    {
        backgroundColor.a = .4f;
        backgroundImage.color = backgroundColor;
    }

    public void OnDrag(PointerEventData eventData)
    {
        dragRectTransform.anchoredPosition += eventData.delta / canvas.scaleFactor;
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        backgroundColor.a = .8f;
        backgroundImage.color = backgroundColor;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        dragRectTransform.SetAsLastSibling();
    }

    public void CloseWindow()
    {
        //Destroy(dragRectTransform.gameObject);
        transform.parent.gameObject.SetActive(false);
    }

    void Awake()
    {
        dragRectTransform = transform.parent.GetComponent<RectTransform>();
        backgroundImage = GetComponent<Image>();
        backgroundColor = backgroundImage.color;
    }

    // Start is called before the first frame update
    void Start()
    {
        canvas = SimpleInventorySystem.InventorySystem.instance.inventoryUI;
    }

    // Update is called once per frame
    void Update()
    {
        
    }
}