using UnityEngine;
using UnityEngine.EventSystems;
[RequireComponent(typeof(UnityEngine.UI.AspectRatioFitter))]
public class MobileInputController : MonoBehaviour,IBeginDragHandler,IDragHandler,IEndDragHandler,IPointerDownHandler,IPointerUpHandler {

    public RectTransform Background;
    public RectTransform Knob;
    [Header("Input Values")]
    public float Horizontal = 0;
    public float Vertical = 0;


    public float offset;
    Vector2 PointPosition;

    public void OnBeginDrag(PointerEventData eventData)
    {
        
    }

    public void OnDrag(PointerEventData eventData)
    {
       
        PointPosition = new Vector2((eventData.position.x - Background.position.x) / ((Background.rect.size.x - Knob.rect.size.x) / 2), (eventData.position.y - Background.position.y) / ((Background.rect.size.y - Knob.rect.size.y) / 2));
        
        PointPosition = (PointPosition.magnitude>1.0f)?PointPosition.normalized :PointPosition;
     
        Knob.transform.position = new Vector2((PointPosition.x *((Background.rect.size.x-Knob.rect.size.x)/2)*offset) + Background.position.x, (PointPosition.y* ((Background.rect.size.y-Knob.rect.size.y)/2) *offset) + Background.position.y);
       
        
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        PointPosition = new Vector2(0f,0f);
        Knob.transform.position = Background.position;
    }
    public void OnPointerDown(PointerEventData eventData)
    {
        OnDrag(eventData);
       
    }

    public void OnPointerUp(PointerEventData eventData) {
        OnEndDrag(eventData);
    }
   
 
 // Update is called once per frame
 void Update () {
        Horizontal = PointPosition.x;
        Vertical = PointPosition.y;
    }

    public Vector2 Coordinate()
    {
        return new Vector2(Horizontal,Vertical);
    }
}