Limiting distance between two objects and enemy movement

Hey I need help with enemy movement and limiting the distance between the enemy and player.
For more information read the comments in the script.

Code (CSharp):

1. public Transform playerpos;
2.     public Rigidbody rbenemy;
3.     public float enemymovespeed;
4.     public float maxdistance;
5.     public float distance;
6.  
7.     void Start()
8.     {
9.         DataManagerS.currentenemylvl += 1;
10.         playerpos = GameObject.Find("Player").GetComponent<Transform>();
11.     }
12.     private void Update()
13.     {
14.         distance = Vector3.Distance(transform.position, playerpos.position);
15.         if (distance > maxdistance) //now move towards the player
16.         {
17.             rbenemy.AddForce(transform.forward * enemymovespeed, ForceMode.Impulse);
18.             //is there a better way to do this, cus like this the enemy just flies away the player and takes ages to come back
19.         }
20.         else
21.         {
22.             distance = maxdistance;
23.             //now limit the distance
24.         }
25.         //used to move to the player
26.         transform.LookAt(playerpos.position);
27.     }
28.     private void OnCollisionEnter(Collision collision)
29.     {
30.         if (collision.gameObject.tag == ("Player"))
31.         {   //killing the player
32.             PlayerMovementS.Health -= 1f;
33.         }
34.     }
35.     private void OnDestroy()
36.     {
37.         DataManagerS.Enemyskilled += 1;
38.     }

 

Your AddForce is moving the enemy in its own forward direction, which has nothing to do with the player's position. I think you want something like "playerpos.position - transform.position" as your force direction, but that's just off the top of my head, so you may have to fiddle with it.

Your line "distance = maxdistance" doesn't do anything, since you don't use the distance variable anywhere outside this function.