public class Zombie : MonoBehaviour
{

    Vector2 TargetPosition;
    Rigidbody2D Rigidbody;
    Player Player;
    Waypoint Waypoint;

    [SerializeField]
    float Speed = 5f;

    [SerializeField]
    float Radius = 0.5f;


    public float TimeBetweenAttack = 1;

    bool RunningToPlayer = false;


	void Start ()
    {

        Player = FindObjectOfType<Player>();
        TargetPosition = transform.position;
        Waypoint = FindObjectOfType<Waypoint>();
        Rigidbody = GetComponent<Rigidbody2D>();
        TargetPosition = Waypoint.GetRandomWaypoint();
        StartCoroutine(CheckIfZombieCanAttackCoroutine());
    }


	void FixedUpdate ()
    {
        //jeśli gracz wejdzie w pole widzenia zombie to wtedy zombie zmierza do pozycji gracza

       if (RunningToPlayer == true)
       {
            Movement();
            TargetPosition = Player.transform.position;


       }
        //jesli zombie osiagnac swoj cel, wylosuj kolejny punkt o ktorego ma sie udac
        if (RunningToPlayer == false)
        {
            Movement();
            if (Vector3.Distance(transform.position, TargetPosition) <= Radius)
            TargetPosition = Waypoint.GetRandomWaypoint();
        }

    }

    IEnumerator CheckIfZombieCanAttackCoroutine()
    {
        while (true)
        {
            if (Vector3.Distance(transform.position, Player.transform.position) <= GetComponent<Statistics>().AttackRange)
            {
                DoDamage();
            }
            yield return new WaitForSeconds(TimeBetweenAttack);
        }
    }
    void Movement()
     {
            var direction = (Vector3)TargetPosition - transform.position;
            var zombieVelocity = direction.normalized * Speed;

            Rigidbody.MovePosition(Rigidbody.position + (Vector2)zombieVelocity * Time.fixedDeltaTime);
            transform.right = (Vector2)direction;
     }

    void DoDamage()
    {

        if (Player.GetComponent<Statistics>().Health > 0)
            Player.GetComponent<Statistics>().Health -= GetComponent<Statistics>().AttackDamage;
        else return;
    }


    private void OnTriggerEnter2D(Collider2D collision)
    {
        RunningToPlayer = true;
        Speed = 3f;
    }
    private void OnTriggerExit2D(Collider2D collision)
    {
        RunningToPlayer = false;

        Speed = 1f;
        TargetPosition = transform.position;

    }
}