Menu System

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

public class MenuSystem : MonoBehaviour
{
    [SerializeField] private GameObject _overlayEffects;
    [SerializeField] private TextMeshProUGUI _endText;
    [SerializeField] private GameObject _firstEffect;
    [SerializeField] private TextMeshProUGUI _timerDisplay;
    [SerializeField] private string _mainLevelName;
    [SerializeField] private AudioSource _audioSource;

    private bool _timerActive;
    private float _currentTime;

    private void Start()
    {
        DontDestroyOnLoad(this.gameObject);
        Invoke("RemoveFirstFade", 0.5f);
        if(PlayerPrefs.GetFloat("BestTime") != 0)
        {
            _timerDisplay.text = "Highscore " + string.Format("{0:00}:{1:00}", PlayerPrefs.GetFloat("BestTime")/60, PlayerPrefs.GetFloat("BestTime")%60);
        }
        else
        {
            _timerDisplay.text = "No Highscore";
        }

    }
    public void WinEffect()
    {
        _endText.text = "Finished!";
        _endText.color = Color.white;
        _audioSource.GetComponent<Animator>().SetTrigger("FadeOut");
        _timerActive = false;
        _overlayEffects.SetActive(true);
        if(_currentTime < PlayerPrefs.GetFloat("BestTime") || PlayerPrefs.GetFloat("BestTime") == 0)
        {
            PlayerPrefs.SetFloat("BestTime", _currentTime);
        }

        Invoke("LoadMenu", 3f);



    }
    public void LooseEffect()
    {
        _endText.text = "You lost!";
        _endText.color = Color.red;
        _audioSource.GetComponent<Animator>().SetTrigger("FadeOut");
        _timerActive = false;
        _overlayEffects.SetActive(true);


        Invoke("LoadMenu", 3f);



    }

    public void LoadMenu()
    {
        //clears curent manager
        RemoveManager();
        _audioSource.Stop();
        SceneManager.LoadScene("MainMenu", LoadSceneMode.Single);


    }
    public void LoadLevel()
    {
        _audioSource.GetComponent<Animator>().SetTrigger("FadeIn");
        _audioSource.Play();
        _currentTime = 0f;
        _timerActive = true;
        SceneManager.LoadScene(_mainLevelName, LoadSceneMode.Single);
    }
    void RemoveManager()
    {
        Destroy(this.gameObject);
    }
    void RemoveFirstFade()
    {
        Destroy(_firstEffect);
    }
    void Update()
    {
        Scene scene = SceneManager.GetActiveScene();
        if(_timerActive && scene.name == _mainLevelName)
        {
            float minutes = Mathf.FloorToInt(_currentTime / 60);
            float seconds = Mathf.FloorToInt(_currentTime % 60);
            _timerDisplay.text = string.Format("{0:00}:{1:00}", minutes, seconds); //(minutes).ToString() + ":" (minutes).ToString();
            _currentTime += Time.deltaTime;

        }


        //clear hi-scores
        if(Input.GetKey(KeyCode.LeftControl) && Input.GetKey(KeyCode.R))
        {
            PlayerPrefs.DeleteAll();
            _timerDisplay.text = "No Highscore";
        }

    }
}