Raycast 2D not working as i hoped

I have changed this code a thousand times...

I want it to hit the collider and change direction. What am I doing wrong?

 using UnityEngine;
 using System.Collections;
 
 
 public class ZeroWaypointAi_2D : MonoBehaviour
 {
     public enum WalkDirection { WalkLeft, WalkRight }
 
     public float speed = 1f;
     private Vector2 moveDirection;
     private WalkDirection walkDir;
 
     protected void Start()
     {
         int rand = Random.Range(0, 2);
         if (rand == 0)
         {
             walkDir = WalkDirection.WalkLeft;
         }
         else
         {
             walkDir = WalkDirection.WalkRight;
         }
     }
     
 
     private void Update()
     {
         RaycastHit2D hit = Physics2D.Raycast(transform.position,transform.right, 1f);
 
         if (walkDir == WalkDirection.WalkLeft)
         {
             if (hit)
             {
                 walkDir = WalkDirection.WalkRight;
             }
 
             moveDirection.x = -speed * Time.deltaTime;
         }
 
         else if (walkDir == WalkDirection.WalkRight)
         {
             if (hit)
             {
                 walkDir = WalkDirection.WalkLeft;
             }
             moveDirection.x = speed * Time.deltaTime;
         }
         
         // move the AI
         transform.Translate(moveDirection);
     }
     
 }