using UnityEngine;

public class LookAtToggleUI : MonoBehaviour
{
    [Header("References")]
    [SerializeField] private Transform source;   // рука / контроллер / камера
    [SerializeField] private Transform target;   // лицо / голова / объект
    [SerializeField] private GameObject uiObject;

    [Header("Settings")]
    [SerializeField, Range(0f, 1f)] private float threshold = 0.9f;
    [SerializeField] private bool useDebug = true;
    [SerializeField] private float debugInterval = 0.1f;

    private float timer;

    private void Start()
    {
        uiObject.SetActive(false);
    }

    private void Update()
    {
        if (source == null || target == null) return;

        Vector3 toTarget = (target.position - source.position).normalized;
        Vector3 forward = source.forward.normalized;

        float dot = Vector3.Dot(forward, toTarget);

        bool isFacing = dot > threshold;
        uiObject.SetActive(isFacing);

        if (useDebug)
        {
            DebugDraw(toTarget, forward, dot);
        }
    }

    private void DebugDraw(Vector3 toTarget, Vector3 forward, float dot)
    {
        timer += Time.deltaTime;
        if (timer < debugInterval) return;
        timer = 0f;

        Debug.DrawRay(source.position, forward, Color.blue, debugInterval);
        Debug.DrawRay(source.position, toTarget, Color.red, debugInterval);
        Debug.DrawLine(source.position, target.position, Color.green, debugInterval);

        Debug.Log($"Dot: {dot:F2}");
    }
}