using UnityEngine;
using System.Collections;

public class AI : MonoBehaviour
{
    public GameObject player;
    public GameObject spawnPoint;

    public float teleportDelay;

    [SerializeField]
    public float chanceOfTeleporting;
    [SerializeField]
    public float chanceOfDisappearing;

    private bool teleporting;
    public float teleportDistance;


    public void Start()
    {
        player = GameObject.FindGameObjectWithTag("Player");
    }

    public void OnBecameVisible()
    {
        ChanceTeleport();
        StartCoroutine("Disappear");
    }


    public void Update ()
    {
        if (Vector3.Distance(transform.position, player.transform.position) <= teleportDistance)
        {
            teleporting = false;
        }

        if (teleporting)
        {
            Teleport();
        }
    }


    public void ChanceTeleport()
    {
        float randomValue = Random.value;
        teleportDistance = Random.Range(1.0F, 20.0F);

        chanceOfTeleporting += 0.05F;

        if (randomValue <= chanceOfTeleporting)
        {
            teleporting = true;
        }
    }

    public void ChanceDisappear()
    {
        float randomValue = Random.value;

        chanceOfTeleporting += 0.3F;

        if (randomValue <= chanceOfDisappearing)
        {
            Disappear();
        }
    }



    public void Teleport()
    {
        if (transform.position != player.transform.position)
        {
            transform.position = Vector3.Lerp(transform.position, player.transform.position, Time.deltaTime * 10);
        }
        else
        {
            teleporting = false;
        }
    }

    public IEnumerator Disappear()
    {
        if (teleporting == false)
        {
            StopCoroutine("Disappear");
        }
        else
        {
            yield return new WaitForSeconds(teleportDelay);
            transform.position = spawnPoint.transform.position;
        }
    }
}