FollowPlayer.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.AI;
using Opsive.UltimateCharacterController.Traits;

public class FollowPlayer : MonoBehaviour {

    private EnemySpawner enemySpawner;

    private Transform playerTrans;

    private Animator anim;

    [SerializeField]
    private bool damaged;

    private NavMeshAgent agent;

    public GameObject impactPoint;

    public Waypoints waypoints;

    [SerializeField]
    private Transform nextWaypoint;

    public bool movingToWaypoint = false;

    public float distanceToPlayer;

    public bool playerSeen = false;

    private CharacterHealth hp;
    private float previousHP;

    private float timeToAttack = 0f;

    // Use this for initialization
    void Start ()
    {
        damaged = false;

        waypoints = GameObject.Find("Waypoints").GetComponent<Waypoints>();
        enemySpawner = GameObject.Find("WaveSpawner").GetComponent<EnemySpawner>();

        hp = GetComponent<CharacterHealth>();
        agent = GetComponent<NavMeshAgent>();
        anim = GetComponent<Animator>();

        previousHP = hp.HealthValue;

        playerTrans = GameObject.Find("MyNolan").transform;

    }

    private void Update()
    {
        distanceToPlayer = Vector3.Distance(transform.position, playerTrans.position);

        if (previousHP !=  hp.HealthValue)
        {
            Follow();
            OnDamage();
        }
        else
        {
            damaged = false;
        }

        if(hp.HealthValue <= 0)
        {
            RemoveEnemyFromList();
        }

        if (playerSeen || damaged)
        {
            Follow();

        }
        else
        {
            if(!movingToWaypoint)
            {
                StartCoroutine("GoToNextWaypoint");
            }

        }
    }

    void OnDamage()
    {
        damaged = true;
    }

    // Update is called once per frame
    void FixedUpdate ()
    {
        timeToAttack -= Time.deltaTime;
    }


    public void GoToNearestWaypoint()
    {
            for (int i = 0; i < waypoints.waypoints.Length; i++)
            {
                float distWaypoint = Vector3.Distance(transform.position, waypoints.waypoints[i].transform.position);
                if (distWaypoint < 30f)
                {
                    nextWaypoint = waypoints.waypoints[i].transform;
                    agent.SetDestination(nextWaypoint.position);
                    movingToWaypoint = true;

                    if (agent.velocity.magnitude > 3f)
                    {
                        anim.SetBool("Run", true);
                        anim.SetBool("Attack", false);
                    }
                    else
                    {
                        anim.SetBool("Run", false);
                        anim.SetBool("Attack", false);
                    }
                }
            }
    }

    public IEnumerator GoToNextWaypoint()
    {
        movingToWaypoint = true;
        agent.SetDestination(transform.position);
        anim.SetBool("Following", false);
        anim.SetBool("Run", false);
        yield return new WaitForSeconds(2.5f);
        nextWaypoint = waypoints.waypoints[Random.Range(0, waypoints.waypoints.Length)].transform;
        agent.SetDestination(nextWaypoint.position);

        if (agent.velocity.magnitude > 3f)
        {
            anim.SetBool("Following", true);
            anim.SetBool("Run", true);
            anim.SetBool("Attack", false);
        }
        else
        {
            anim.SetBool("Following", true);
            anim.SetBool("Run", false);
            anim.SetBool("Attack", false);
        }
    }

    private void OnTriggerEnter(Collider other)
    {
        if(other.gameObject.tag == "Waypoint")
        {
            StartCoroutine("GoToNextWaypoint");
        }
    }

    /*public void Idle()
    {
        playerSeen = false;
        anim.SetBool("Following", false);
        anim.SetBool("Run", false);
        agent.SetDestination(transform.position);
    }*/

    public void Follow()
    {

        movingToWaypoint = false;

        anim.SetBool("Following", true);
        anim.SetBool("Attack", false);

        if (distanceToPlayer <= 2.5f)
        {
            anim.SetBool("Run", false);
            anim.SetBool("Attack", true);
            if (timeToAttack <= 0f)
                TryAttack();
        }

        agent.SetDestination(new Vector3(playerTrans.position.x, playerTrans.position.y, playerTrans.position.z));

        if (agent.velocity.magnitude > 3f)
        {
            anim.SetBool("Run", true);
        }

        if (distanceToPlayer > 30f)
        {
            playerSeen = false;
        }
        if (distanceToPlayer > 40)
        {
            damaged = false;
        }
    }

    void TryAttack()
    {
        Attack();
        timeToAttack = 1f;
    }

    void Attack()
    {
        transform.LookAt(playerTrans);
        impactPoint.SetActive(true);
        StartCoroutine("DeactivateImpact", .5f);

    }

    public IEnumerator DeactivateImpact(float seconds)
    {
        yield return new WaitForSeconds(seconds);
        impactPoint.SetActive(false);
    }

    public void RemoveEnemyFromList()
    {
        enemySpawner.SendMessage("RemoveEnemy", this.gameObject);
        Destroy(gameObject);
    }

}