Simple Waypoint Pathfinding with the Line of Sight AI

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

public class WayPointAI : MonoBehaviour
{
    public Transform player;
    public Transform head;
    Animator anim;

    string state = "patrol";
    public GameObject[] waypoints;
    int currentWP = 0;
    public float rotspeed = 0.2f;
    public float speed = 1.5f;
    public float accuracyWP = 5.0f;

    void Start()
    {
        anim = GetComponent<Animator>();
    }

    void Update()
    {
        Vector3 direction = player.position - this.transform.position;
        direction.y = 0;
        float angle = Vector3.Angle(direction, head.up);

        if (state == "patrol" && waypoints.Length > 0)
        {
            //anim.Play("walk");
            print("Now walking");
            if (Vector3.Distance(waypoints[currentWP].transform.position, transform.position) < accuracyWP)
            {
                //for random waypoint(next 3 line will be in comment section) -> //currentWP = Random.Range(0, waypoints.Length);
                currentWP++;
                if (currentWP >= waypoints.Length)
                {
                    currentWP = 0;
                }
            }
            //rotate towards waypoint
            direction = waypoints[currentWP].transform.position - transform.position;
            this.transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(direction), rotspeed * Time.deltaTime);
            this.transform.Translate(0, 0, Time.deltaTime * speed);
        }
                                                                            //angle from which AI will see the target
        if(Vector3.Distance(player.position, this.transform.position)<10 && (angle<300 || state=="pursuing"))
        {
            state = "pursuing";
            this.transform.rotation = Quaternion.Slerp(this.transform.rotation, Quaternion.LookRotation(direction), rotspeed * Time.deltaTime);
            if(direction.magnitude > 5)
            {
                this.transform.Translate(0, 0, Time.deltaTime * speed);
                //anim.Play("walk");
                print("Now walking");
            }
            else
            {
                //anim.Play("attack");
                print("Now attacking");
            }
        }
        else
        {
            //anim.Play("walk");
            print("Now walking");
            state = "patrol";
        }
    }
}