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

public class CraftingClickAndDrag : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler {

    public static Vector3 startPosition;
    public static GameObject itemBeingDragged;
    Transform startParent;

    public int slotNumber;

    public static int currentSlotNumber;

    Camera camera;

    void Start()
    {
        camera = GameObject.Find("Main Camera").GetComponent<Camera>();
    }


#region IBeginDragHandler implementation

    public void OnBeginDrag(PointerEventData eventData)
    {
        itemBeingDragged = gameObject;//(GameObject)Instantiate(gameObject, transform.position, transform.rotation);
        startPosition = transform.position;
        startParent = transform.parent;
        GetComponent<CanvasGroup>().blocksRaycasts = false;
        currentSlotNumber = slotNumber;
        GameObject.Find("craftingCanvas").GetComponent<ExplorationCraftingUI>().dragItemViewOn(slotNumber);
    }

#endregion

#region IDragHandler implementation

    public void OnDrag(PointerEventData eventData)
    {
        Vector3 position = camera.ScreenToWorldPoint(Input.mousePosition);
        transform.position = new Vector3 (position.x, position.y, 0);
    }

#endregion

#region IEndDragHandler implementation

    public void OnEndDrag(PointerEventData eventData)
    {
        Debug.Log("END DRAG");
        itemBeingDragged = null;
        transform.position = startPosition;
        GetComponent<CanvasGroup>().blocksRaycasts = true;
    }

#endregion
}