using UnityEngine;
using UnityEngine.EventSystems;

public class DragRotator : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
	public Transform root;
	public new Camera camera;

	private Vector3 _lastPoint;

	public RenderTexture renderTexture
	{
		get;
		private set;
	}

	// Start is called before the first frame update
	private void Awake()
	{
		//RenderTextureDescriptor desc = default;
		//desc.width = 1024;
		//desc.height = 1024;

		renderTexture = RenderTexture.GetTemporary(1024, 1024, 16, RenderTextureFormat.ARGB32);
		camera.targetTexture = renderTexture;
	}

	private void OnDestroy()
	{
		RenderTexture.ReleaseTemporary(renderTexture);
	}

	// Update is called once per frame
	private void Update()
	{
		if (Input.GetMouseButtonDown(0))
		{
			_lastPoint = Input.mousePosition;
		}
		else if (Input.GetMouseButton(0))
		{
			var mousePoint = Input.mousePosition;
			var deltaX = _lastPoint.x - mousePoint.x;
			var deltaY = _lastPoint.y - mousePoint.y;
			_lastPoint = mousePoint;
			var pointY = Screen.height / 1920f * 1000f;
			if (mousePoint.y > pointY)
				root.Rotate(Vector3.up * (deltaX * 10f * Time.deltaTime), Space.Self);
		}

	}

	public void OnDrag(PointerEventData eventData)
	{
		root.Rotate(Vector3.up * (-eventData.delta.x), Space.Self);
	}

	public void OnBeginDrag(PointerEventData eventData)
	{

	}

	public void OnEndDrag(PointerEventData eventData)
	{

	}
}