Unity Enemy Script

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

[RequireComponent(typeof(NavMeshAgent))]
public class Enemy : LivingEntity
{
    public enum State { Idle, Chasing, Attacking}
    public State currentState;

    NavMeshAgent pathfinder;
    Transform target;
    Material skinMaterial;

    Color originalColor;


    float attackDistanceThreshold = 0.5f;
    float timeBetweenAttack = 1;

    float nextAttackTime;
    float myCollisionRadius;
    float targetCollisionRadius;

    protected override void Start()
    {
        base.Start();
        pathfinder = GetComponent<NavMeshAgent>();
        skinMaterial = GetComponent<Renderer>().material;
        originalColor = skinMaterial.color;

        currentState = State.Chasing;
        target = GameObject.FindGameObjectWithTag("Player").transform;

        myCollisionRadius = GetComponent<CapsuleCollider>().radius;
        targetCollisionRadius = target.GetComponent<CapsuleCollider>().radius;

        StartCoroutine(UpdatePath());
    }

    private void Update()
    {
        if(Time.time > nextAttackTime)
        {
            float sqrDistToTarget = (target.position - transform.position).sqrMagnitude;
            if(sqrDistToTarget < Mathf.Pow(attackDistanceThreshold + myCollisionRadius + targetCollisionRadius, 2))
            {
                nextAttackTime = Time.time + timeBetweenAttack;
                StartCoroutine(Attack());
            }
        }
    }

    IEnumerator Attack()
    {
        currentState = State.Attacking;
        pathfinder.enabled = false;

        Vector3 originalPosition = transform.position;
        Vector3 dirToTarget = (target.position - transform.position).normalized;
        Vector3 attackPosition = target.position - dirToTarget * myCollisionRadius;
        //Vector3 attackPosition = target.position;

        float attackSpeed = 3;
        float percent = 0;

        skinMaterial.color = Color.red;

        while (percent <= 1)
        {
            percent += Time.deltaTime * attackSpeed;
            float interpolation = (-Mathf.Pow(percent, 2) + percent) * 4;
            transform.position = Vector3.Lerp(originalPosition, attackPosition, interpolation);

            yield return null;
        }

        skinMaterial.color = originalColor;
        currentState = State.Chasing;
        pathfinder.enabled = true;
    }

    IEnumerator UpdatePath()
    {
        float updateRate = 0.25f;

        while(target != null)
        {
            if(currentState == State.Chasing)
            {
                Vector3 dirToTarget = (target.position - transform.position).normalized;
                Vector3 targetPosition = target.position - dirToTarget * (myCollisionRadius + targetCollisionRadius + attackDistanceThreshold/2);
                if (!isDead)
                {
                    pathfinder.SetDestination(targetPosition);
                }
            }
            yield return new WaitForSeconds(updateRate);
        }
    }
}

 

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