using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using NaughtyAttributes;
//thomas09
//this script is to be attached to all buttons in a scroll list. So that when using controller to navigate. It will position the scroll view accordingly.

public class MoveScrollRect : MonoBehaviour, ISelectHandler
{
    [Header("Only Assign in the inspector if the relationship is inactive.")]
    [SerializeField] ScrollRect scrollRect = null;

    private void Awake()
    {
        if (scrollRect == null)
            scrollRect = GetComponentInParent<ScrollRect>();
    }

    public void OnSelect(BaseEventData _)
    {
        if (!scrollRect)
        {
            Debug.LogError("Could not find ScrollRect");
            return;
        }


        if (Player.Instance.GetInputHandler().UsingGamePad)
        {
            RectTransform contentPanel = scrollRect.content;
            Canvas.ForceUpdateCanvases();

            float prevX = contentPanel.anchoredPosition.x;

            Vector3 offset = contentPanel.position;
            offset.y -= 35.0f;

            Vector2 anchoredPosition =
                (Vector2)scrollRect.transform.InverseTransformPoint(offset) -
                (Vector2)scrollRect.transform.InverseTransformPoint(transform.position);

            anchoredPosition.x = prevX;
            contentPanel.anchoredPosition = anchoredPosition;
        }
    }
}