using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;

public class EnemyMovement : MonoBehaviour
{
    public float fov = 120f;
    public float loseThreshold = 10f;
    public float viewDistance = 10f;
    public float wonderRadius = 10f;
    public float rotationMultiplyer = 15f;

    private bool isAware = false;
    private bool isDetecting = false;
    private float loseTimer = 0;
    private float playerDistance;

    private Vector3 wanderPoint;
    Transform player;
    NavMeshAgent nav;
    public Transform shoot;



    private void Awake()
    {
        player = GameObject.FindGameObjectWithTag("Player").transform;

        nav = GetComponent<NavMeshAgent>();
        wanderPoint = RandomNavPoint();
    }

    private void Update()
    {

        Chase();
    }

    public void SearchForPlayer()
    {
        if (Vector3.Angle(Vector3.forward, transform.InverseTransformPoint(player.position)) < fov / 2f)
        {
            if (Vector3.Distance(player.position, transform.position) < viewDistance)
            {
                RaycastHit hit;
                if (Physics.Linecast(transform.position, player.position, out hit, -1))
                {
                    if (hit.transform.CompareTag("Player"))
                    {
                        OnAware();
                    }
                    else
                    {
                        isDetecting = false;
                    }
                }
                else
                {
                    isDetecting = false;
                }
            }
            else
            {
                isDetecting = false;
            }
        }
        else
        {
            isDetecting = false;
        }
    }

    public void OnAware()
    {
        isAware = true;
        isDetecting = true;
        loseTimer = 0f;
    }

    public void Chase()
    {
        if (isAware)
        {
            FacePlayer();
            nav.SetDestination(player.position);
            if (!isDetecting)
            {
                loseTimer += Time.deltaTime;
                if (loseTimer >= loseThreshold)
                {
                    isAware = false;
                    loseTimer = 0f;
                }
            }
        }
        else
        {
            Wander();

        }
        SearchForPlayer();
    }

   void FacePlayer()
    {
        Vector3 direction = (player.position - transform.position).normalized;
        Quaternion lookRotation = Quaternion.LookRotation(new Vector3(direction.x, 0, direction.z));
        transform.rotation = Quaternion.Slerp(transform.rotation, lookRotation, Time.deltaTime * rotationMultiplyer);
    }


    public void Wander()
    {
        if (Vector3.Distance(transform.position, wanderPoint) < 5f)
        {
            wanderPoint = RandomNavPoint();
        }
        else
        {
            nav.SetDestination(wanderPoint);
        }
    }

    public Vector3 RandomNavPoint()
    {
        Vector3 randomPoint = (Random.insideUnitSphere * wonderRadius) + transform.position;
        NavMeshHit navHit;
        NavMesh.SamplePosition(randomPoint, out navHit, wonderRadius, -1);
        return new Vector3(navHit.position.x, transform.position.y, navHit.position.z);
    }
}