Scriptum/Assets/OpenPanelOnCollision.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Linq;
using UnityEngine.SceneManagement;

public class OpenPanelOnCollision : MonoBehaviour
{

    public GameObject Panel;
    public GameObject OtherPanel;
    public GameObject SecondPanel;
    public GameObject PanelAbove;

    // Handle dynamic build GameObject's
    public GameObject _tmpPanel;
    public GameObject _tmpOtherPanel;
    public GameObject _tmpSecondPanel;
    public GameObject _tmpPanelAbove;
    
    private GameObject globalGUI;

    public GameObject obj;

    private bool inRange = false;

    public bool isAllowedToShowPanels = true;  // TODO: controle its value - mprove later with cooperaition with "closePossibleButtonInfo" script

    public void Awake()
    {
        this.globalGUI = GameObject.FindGameObjectsWithTag("GUI")[0];
    }

    public void Start()
    {
        if(obj == null && SceneManager.GetActiveScene().name == "SampleScene")
            obj = GameObject.FindGameObjectsWithTag("NPC").Where(obj => obj.name == "BossThug").ToArray()[0];
    }

    public void ClearPanels()
    {
        if(_tmpPanel) Destroy(_tmpPanel);
        if(_tmpSecondPanel) Destroy(_tmpSecondPanel);
        if(_tmpPanelAbove) Destroy(_tmpPanelAbove);
    }

    private void OnDestroy()
    {
        this.ClearPanels();
    }

    private void OnTriggerEnter2D(Collider2D collision)
    {
        if(collision.tag == "Player" && isAllowedToShowPanels)
        {
            inRange = true;
            if(!_tmpSecondPanel)
            {
                if(!_tmpPanel) {_tmpPanel = Instantiate(Panel, Panel.transform.position, Quaternion.identity, globalGUI.transform); _tmpPanel.transform.localPosition = Panel.transform.position;}
                //Panel.SetActive(true);
            }
            else
            {
                if(!_tmpPanelAbove) { _tmpPanelAbove = Instantiate(PanelAbove, PanelAbove.transform.position, Quaternion.identity, globalGUI.transform); _tmpPanelAbove.transform.localPosition = PanelAbove.transform.position;}
                //PanelAbove.SetActive(true);
            }
        }    
    }

    private void OnTriggerStay2D(Collider2D collision)
    {
        if (collision.tag == "Player" && isAllowedToShowPanels)
        {
            inRange = true;
            if(_tmpOtherPanel) //OtherPanel.active == true
            {
                if (!_tmpSecondPanel) //SecondPanel.active == false
                {
                    if(_tmpPanel) Destroy(_tmpPanel);
                    //Panel.SetActive(false);
                }
                else
                {
                    if(_tmpSecondPanel) Destroy(_tmpSecondPanel);
                    if(_tmpPanelAbove) Destroy(_tmpPanelAbove);
                    // SecondPanel.SetActive(false);
                    // PanelAbove.SetActive(false);
                }
            }
            else if (!_tmpSecondPanel)  // SecondPanel.active == false
            {
                if(!_tmpPanel) { _tmpPanel = Instantiate(Panel, Panel.transform.position, Quaternion.identity, globalGUI.transform); _tmpPanel.transform.localPosition = Panel.transform.position;}

                //Panel.SetActive(true);
            }
            else
            {
                if(!_tmpPanelAbove) { _tmpPanelAbove = Instantiate(PanelAbove, PanelAbove.transform.position, Quaternion.identity, globalGUI.transform); _tmpPanelAbove.transform.localPosition = PanelAbove.transform.position;}
                //PanelAbove.SetActive(true);
            }
        }
    }


    IEnumerator Timer1()
    {
        yield return new WaitForSeconds(0.3f);
        if(inRange == false)
        {
            if(_tmpPanel) Destroy(_tmpPanel);
            //Panel.SetActive(false);
        }
    }

    IEnumerator Timer2()
    {
        yield return new WaitForSeconds(0.3f);
        if (inRange == false)
        {
            if(_tmpPanelAbove) Destroy(_tmpPanelAbove);
            //PanelAbove.SetActive(false);
        }
    }

    void Update()
    {

        if(obj != null && obj.active == false)
        {
            if (_tmpPanel) //Panel.active == true
            {
                Destroy(_tmpPanel);
                //Panel.SetActive(false);
            }
            else if (_tmpPanelAbove) //PanelAbove.active == true
            {
                Destroy(_tmpPanelAbove);
                //PanelAbove.SetActive(false);
            }
        }

        if(_tmpOtherPanel) //OtherPanel.active == true
        {
            StartCoroutine(Timer1());
        }
        if(!_tmpSecondPanel) //SecondPanel.active == false
        {
            if(_tmpPanelAbove) //PanelAbove.active == true
            {
                StartCoroutine(Timer2());
                Destroy(_tmpPanelAbove);
                //PanelAbove.SetActive(false);
                if(!_tmpPanel) { _tmpPanel = Instantiate(Panel, Panel.transform.position, Quaternion.identity, globalGUI.transform); _tmpPanel.transform.localPosition = Panel.transform.position;}

                //Panel.SetActive(true);
            }
        }
    }

    private void OnTriggerExit2D(Collider2D collision)
    {
        inRange = false;
        if(_tmpPanel) //Panel.active == true
        {
            StartCoroutine(Timer1());
        }
        else if(_tmpPanelAbove) //PanelAbove.active == true
        {
            StartCoroutine(Timer2());
        }
    }
}