using UnityEngine;
using UnityEngine.UI;



public class Display : MonoBehaviour
{
    [SerializeField] private Transform _displayAnchor;
    [SerializeField] private Camera _camera;
    [SerializeField] private RectTransform _display;
    [SerializeField] private Canvas _canvas;
    private Vector2 _textureDimensions;

    [SerializeField] private float _rotationSensitivity = 15;
    [SerializeField] private float _minRotationX = -360;
    [SerializeField] private float _maxRotationX= 360;
    [SerializeField] private float _minRotationY = -30;
    [SerializeField] private float _maxRotationY = 30;
    private float _rotationX;
    private float _rotationY;
    private Quaternion _originalRotation;

    public Transform marker; //Debug

    // Start is called before the first frame update
    void Start()
    {
        _textureDimensions = new Vector2(_display.GetComponent<RawImage>().texture.width,
                                         _display.GetComponent<RawImage>().texture.height);
        _originalRotation = _displayAnchor.GetChild(0).localRotation;

    }

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

        Vector3 scaledSizeDelta = _display.sizeDelta * _canvas.scaleFactor;
        Vector3 bottomLeftCorner = new Vector3(_display.position.x - (scaledSizeDelta.x / 2),
                                               _display.position.y - (scaledSizeDelta.y / 2));

        CastRay(_camera, bottomLeftCorner, scaledSizeDelta, _textureDimensions);
     


    }

    private RaycastHit CastRay(Camera camera, Vector3 bottomLeftCorner, Vector3 sizeDelta, Vector2 textureDimensions)
    {

        Vector3 relativeMousePosition = Input.mousePosition - bottomLeftCorner;
        relativeMousePosition.x = (relativeMousePosition.x / sizeDelta.x) * textureDimensions.x;
        relativeMousePosition.y = (relativeMousePosition.y / sizeDelta.y) * textureDimensions.y;

        RaycastHit hit;

        Ray ray = camera.ScreenPointToRay(relativeMousePosition);
        if (Physics.Raycast(ray, out hit, Mathf.Infinity)) {
            Debug.DrawLine(camera.transform.position, hit.point, Color.blue);
            marker.position = hit.point;
        }

        return hit;

    }


    private void RotatePivot(Transform pivot)
    {
        _rotationX += Input.GetAxis("Mouse X") * _rotationSensitivity;
        _rotationY += Input.GetAxis("Mouse Y") * _rotationSensitivity;
        _rotationX = ClampAngle(_rotationX, _minRotationX, _maxRotationX);
        _rotationY = ClampAngle(_rotationY, _minRotationY, _maxRotationY);

        Quaternion xQuaternion = Quaternion.AngleAxis(_rotationX, Vector2.up);
        Quaternion yQuaternion = Quaternion.AngleAxis(_rotationY, Vector2.left);

        pivot.localRotation = _originalRotation * xQuaternion * yQuaternion;

    }


    private float ClampAngle(float angle, float min, float max)
    {
        if (angle > 360)
            angle -= 360;

        if (angle < -360)
            angle += 360;


        return Mathf.Clamp(angle, min, max);
    }
}