using UnityEngine;
using System.Collections;

public class EnemySight : MonoBehaviour
{
    public static EnemySight Instance;
    private RaycastHit SightInfo;
    private Collider LastSight;
    private int SightMask = 1 << 14; // i dont want raytrace to collide with layer 14
    // and cant put it into ignoreraycast for custom collision reason

    void Awake()
    {
        Instance = this;
        SightMask = ~SightMask;
    }

    void OnTriggerEnter(Collider collider)
    {
        if (collider.gameObject.tag == "Player")
        {
            ProcessSight(collider);
        }
    }

    void OnTriggerStay(Collider collider)
    {
        if (collider.gameObject.tag == "Player")
        {
            ProcessSight(collider);
        }
    }

    void ProcessSight(Collider collider)
    {
        Ray MyRay = new Ray(transform.parent.transform.position + Vector3.up, (collider.transform.position - Vector3.up) - transform.parent.transform.position);
        if (Physics.Raycast(MyRay, out SightInfo, Mathf.Infinity, SightMask))
        {
            if (SightInfo.collider.gameObject.tag == "Player")
            {
                LastSight = SightInfo.collider;
                Debug.DrawRay(transform.parent.transform.position + Vector3.up, (collider.transform.position - Vector3.up) - transform.parent.transform.position);
                EnemyAI.Instance.SetAttention(LastSight, true, false, false);
            }
        }
        else if (LastSight != null)
        {
            if (LastSight.gameObject.tag == "Player")
            EnemyAI.Instance.RemoveThisAttention(LastSight);
        }

    }
}