using System.Collections;
using UnityEngine;

public class FieldOfView : MonoBehaviour
{
    [Range(0, 360)]
    public float viewAngle = 90f; 
    public float viewRadius = 20f;
    public LayerMask obstacleLayerMask;
    public LayerMask targetLayerMask;
    
    [HideInInspector] public bool canSeePlayer = false;
    [HideInInspector] public Vector3 lastKnownPlayerPosition;

    void Start()
    {
        StartCoroutine(FindTargetWithDelay(0.1f));
    }

    IEnumerator FindTargetWithDelay(float delay)
    {
        while (true)
        {
            yield return new WaitForSeconds(delay);
            FindVisibleTargets();
        }
    }

    private void FindVisibleTargets()
    {
        canSeePlayer = false;
        var colliders = Physics.OverlapSphere(transform.position, viewRadius, targetLayerMask);

        for (int i = 0; i < colliders.Length; i++)
        {
            var target = colliders[i].transform;
            var direction = (target.position - transform.position).normalized;
            var angle = Vector3.Angle(transform.forward, direction);

            if (angle < viewAngle / 2)
            {
                float distanceToTarget = Vector3.Distance(transform.position, target.position);
                if (!Physics.Raycast(transform.position, direction, distanceToTarget, obstacleLayerMask))
                {
                    canSeePlayer = true;
                    lastKnownPlayerPosition = target.position;
                    Debug.DrawLine(transform.position, target.position, Color.blue, 1f);
                }
            }
        }
    }
}