using TMPro;
using UnityEngine;
using UnityEngine.UI;
namespace UI
{
    public class WaypointMarker : MonoBehaviour
    {
        public Image pointer;
        public Transform target;
        public TMP_Text distanceMarker;

        private Vector2 offset;

        // Start is called before the first frame update
        private void Start()
        {
            offset = distanceMarker.transform.position - pointer.transform.position;
        }

        // Update is called once per frame
        private void Update()
        {
            var minX = pointer.GetPixelAdjustedRect().width / 2;
            var maxX = Screen.width - minX;
            var minY = pointer.GetPixelAdjustedRect().height / 2;
            var maxY = Screen.height - minY;

            Vector2 pos = Camera.main.WorldToScreenPoint(target.position);

            if (Vector3.Dot(target.position - Camera.main.transform.position, Camera.main.transform.forward) < 0)
            {
                //target is behind player
                if (pos.x < Screen.width / 2)
                    pos.x = maxX;
                else
                    pos.x = minX;
            }

            pos.x = Mathf.Clamp(pos.x, minX, maxX);
            pos.y = Mathf.Clamp(pos.y, minY, maxY);

            pointer.transform.position = pos;
            distanceMarker.text =
                Mathf.RoundToInt(Vector3.Distance(Camera.main.transform.position, target.transform.position)) + " meters";
            if (pos.x < Screen.width / 2)
                distanceMarker.transform.position = pos + offset;
            else
                distanceMarker.transform.position = pos - offset;
        }
    }
}