ZombieAI

using UnityEngine;
using System.Collections;


[RequireComponent(typeof(NavMeshAgent))]
public class ZombieAI : MonoBehaviour {

    private NavMeshAgent NMA;
    public GameObject player;

    public Vector3 distanceFromPlayer;

    public float timeToAttack = 2;
    private float currentTimeToAttack;

    public Animation zombieAnim;
    public AnimationClip[] animations;

    public int damage;

    public bool canUp;
    public bool canMove;
    public bool isAttacking;
    public bool isDead;

	void Start () {
        damage = Random.Range(5, 10);
        NMA = this.GetComponent<NavMeshAgent>();
	}

	void Update () {
        distanceFromPlayer = this.transform.position - player.transform.position;

        canMove = !isAttacking;

        if(currentTimeToAttack > timeToAttack) {
            currentTimeToAttack = 0;
            isAttacking = false;
            canUp = false;
        }

        //        if(distanceFromPlayer.x >= -0.2f && distanceFromPlayer.x <= 0 && distanceFromPlayer.z >= -0.75f && distanceFromPlayer.y <= -0.5f && currentTimeToAttack == 0) {
        //
        //            isAttacking = true;
        //           Attack();
        //        }

        if (canUp) {
            currentTimeToAttack += Time.deltaTime;
        }

 //       if (!canMove && !isAttacking) {
 //           zombieAnim.clip = animations[3];
 //           zombieAnim.Play();
  //      }

        if (canMove && !isDead) {
            zombieAnim.clip = animations[0];
            zombieAnim.Play();
            NMA.SetDestination(player.transform.position);
        }
	}

    private void Attack() {
        player.GetComponent<PlayerStats>().life -= damage;
        isAttacking = true;
        canUp = true;
    }

    void OnTriggerEnter(Collider other) {
        if (other.gameObject.tag == "Player") {
            canMove = false;
            zombieAnim.clip = animations[1];
            zombieAnim.Play();
            Attack();
        }
    }
}