lockingOn

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

public class lockingOn : MonoBehaviour
{

    public List<Transform> targets;
    public Transform selectedTarget;
    public string targetTag = "enemyChest";
    private Transform myTransform;
    //Use this for initialization
    void Start()
    {
        targets = new List<Transform>();
        selectedTarget = null;
        myTransform = transform;
        AddAllEnemies();
    }

    public void AddAllEnemies()
    {

        //Vector3 myVector3f;
        //myVector3f = new Vector3(0, 3f, 0);
        GameObject[] go = GameObject.FindGameObjectsWithTag(targetTag);
        foreach (GameObject enemy in go)
        {

            AddTarget(enemy.transform);
            //AddTarget(enemy.transform + myVector3f);
        }
    }

    public void AddTarget(Transform enemy)
    {
        targets.Add(enemy);
    }

    private void SortTargetsByDistance()
    {
        targets.RemoveAll(target => target == null);
        targets.Sort(delegate (Transform t1, Transform t2)
        {
            return (Vector3.Distance(t1.position, myTransform.position).CompareTo)
                (Vector3.Distance(t2.position, myTransform.position));
        });
    }

    private void TargetEnemy()
    {
        if (selectedTarget == null)
        {
            SortTargetsByDistance();
            selectedTarget = targets[0];
        }
        else
        {
            int index = targets.IndexOf(selectedTarget);
            if (index < targets.Count - 1)
            {
                index++;
            }
            else
            {
                index = 0;
            }

            selectedTarget = targets[index];
        }
    }

    //Update is called once per frame
    void Update()
    {
        if (Input.GetKeyUp(KeyCode.Tab))
        {
            TargetEnemy();

        }
    }



   private void LateUpdate()
   {
        lockOnTab();

   }

    void lockOnTab()
    {
                if (Input.GetKeyUp(KeyCode.Tab))
                {

                    Vector3 myVector;
                    myVector = new Vector3(0, .1f, 0);
                    Vector3 relativePos = selectedTarget.position - transform.position + myVector;

                    // the second argument, upwards, defaults to Vector3.up
                    Quaternion rotation = Quaternion.LookRotation(relativePos, myVector);
                    transform.rotation = rotation;
                }

                if (selectedTarget != null)
                {

                    Vector3 myVector;
                    myVector = new Vector3(0, .1f, 0);
                    Vector3 relativePos = selectedTarget.position - transform.position + myVector;

                    // the second argument, upwards, defaults to Vector3.up
                    Quaternion rotation = Quaternion.LookRotation(relativePos, myVector);
                    transform.rotation = rotation;
                }

                if (Input.GetKeyUp(KeyCode.Q))
                {
                    selectedTarget = null;
                    return;
                }
    }

}