2d rotation doesn't work.

Hello guys, I have this problem, when I go with my 2d texture character to the left everything is ok (The texture is made to the left) but when I go to the right he inverts himself and goes to the left this is the script: using UnityEngine; using System.Collections;

 public class Movement : MonoBehaviour {
 
     
     public float speed = 8.0F;
     public float jumpSpeed = 8.0F;
     public float gravity = 4.0F;
     private Vector3 moveDirection = Vector3.zero;
     private CharacterController controller;
     private bool rot = false;
     public Vector2 offset = Vector2.zero; 
     public float rotspeed = 0.5f;
     
     
     
     void Start () 
     {
         
     }
     
     void Update () 
     {
         
         CharacterController controller = GetComponent<CharacterController>();
         if(controller.isGrounded) 
         {
             moveDirection = new Vector3(Input.GetAxis("Horizontal"), 0, 0);
             
             moveDirection = transform.TransformDirection(moveDirection);
             moveDirection *= -speed;
             
             float moveDir = Input.GetAxisRaw("Horizontal");
         if (moveDir !=0) {
             transform.eulerAngles = (moveDir>0)?Vector3.up * 180:Vector3.zero;
         }
             
             if(Input.GetButton("Jump"))
             {
                 moveDirection.y = jumpSpeed;
             }
         }
         moveDirection.y -= gravity * Time.deltaTime;
         
         controller.Move(moveDirection * Time.deltaTime);
         
     }
     
 }