Flying Enemy

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

public class FlyingEnemy : MonoBehaviour
{

    public float flyHealth = 1;
    private float spearDamage = 1;
    private float leftMove = 2.0f;
    private float rightMove = 2.0f;
    private float speed = 5.0f;
    private int direction = 1;
    private Vector2 movement;
    public Rigidbody potion;
    public GameObject otherEnemy;



    // Update is called once per frame
    void Update()
    {

        while (flyHealth == 1)
        {
            if (transform.position.x > rightMove)
            {
                direction = -1;
            }

            else if (transform.position.x > leftMove)
            {
                direction = 1;
            }

            movement = Vector2.right * direction * speed * Time.deltaTime;
            transform.Translate(movement);
            if (Random.Range(0f, 1f) == 1)
            {

                Rigidbody potionInstance;
                potionInstance = Instantiate(potion) as Rigidbody;
                potionInstance.AddForce(Vector3.down * 5000);
            }
        }
    }
    private void OnTriggerEnter2D(Collider2D other)
    {
        if (other.tag == "Spear")
        {
            flyHealth -= spearDamage;
        }

        if (flyHealth <= 0)
        {
            Destroy(otherFlyEnemy);
            if (Random.Range(0f, 1f) == 1)
            {
                Rigidbody potionInstance;
                potionInstance = Instatiate(potion) as Rigidbody;
                potionInstance.addForce(Vector3.down * 5000);
            }
        }

    }
}