UIManager.cs

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

public class UIManager : MonoBehaviour
{
    public static UIManager instance;

    [Header(" Elements ")]
    [SerializeField] private CanvasGroup menuCG;
    [SerializeField] private CanvasGroup gameCG;
    [SerializeField] private CanvasGroup levelCompleteCG;
    [SerializeField] private CanvasGroup gameoverCG;
    [SerializeField] private CanvasGroup settingsCG;

    [Header(" Menu Elements ")]
    [SerializeField] private TextMeshProUGUI menuCoins;
    [SerializeField] private TextMeshProUGUI menuBestScore;

    [Header(" Level Complete Elements ")]
    [SerializeField] private TextMeshProUGUI levelCompleteCoins;
    [SerializeField] private TextMeshProUGUI levelCompleteSecretWord;
    [SerializeField] private TextMeshProUGUI levelCompleteScore;
    [SerializeField] private TextMeshProUGUI levelCompleteBestScore;

    [Header(" Gameover Elements ")]
    [SerializeField] private TextMeshProUGUI gameoverCoins;
    [SerializeField] private TextMeshProUGUI gameoverSecretWord;
    [SerializeField] private TextMeshProUGUI gameoverBestScore;


    [Header(" Game Elements ")]
    [SerializeField] private TextMeshProUGUI gameScore;
    [SerializeField] private TextMeshProUGUI gameCoins;

    private void Awake()
    {
        if (instance == null)
            instance = this;
        else
            Destroy(gameObject);
    }

    // Start is called before the first frame update
    void Start()
    {
        //ShowGame();
        ShowMenu();
        HideGame();
        HideLevelComplete();
        HideGameover();

        GameManager.onGameStateChanged += GameStateChangedCallback;
        DataManager.onCoinsUpdated += UpdateCoinsTexts;
    }

    private void OnDestroy()
    {
        GameManager.onGameStateChanged -= GameStateChangedCallback;
        DataManager.onCoinsUpdated -= UpdateCoinsTexts;
    }

    private void GameStateChangedCallback(GameState gameState)
    {
        switch (gameState)
        {
            case GameState.Menu:

                ShowMenu();
                HideGame();

                break;

            case GameState.Game:

                ShowGame();
                HideMenu();
                HideLevelComplete();
                HideGameover();

                break;

            case GameState.LevelComplete:
                ShowLevelComplete();
                HideGame();
                break;

            case GameState.Gameover:
                ShowGameover();
                HideGame();
                break;

        }
    }   

    // Update is called once per frame
    void Update()
    {

    }
    
    public void UpdateCoinsTexts()
	{
    	menuCoins.text = DataManager.instance.GetCoins().ToString();
    	gameCoins.text = menuCoins.text;
    	levelCompleteCoins.text = menuCoins.text;
    	gameoverCoins.text = menuCoins.text;
	}

    private void ShowMenu()
    {
        menuCoins.text = DataManager.instance.GetCoins().ToString();
        menuBestScore.text = DataManager.instance.GetBestScore().ToString();

        ShowCG(menuCG);
    }

    private void HideMenu()
    {
        HideCG(menuCG);
    }

    private void ShowGame()
    {
        gameCoins.text = DataManager.instance.GetCoins().ToString();
        gameScore.text = DataManager.instance.GetScore().ToString();

        ShowCG(gameCG);
    }

    private void HideGame()
    {
        HideCG(gameCG);
    }

    private void ShowLevelComplete()
    {
        levelCompleteCoins.text = DataManager.instance.GetCoins().ToString();
        levelCompleteSecretWord.text = WordManager.instance.GetSecretWord();
        levelCompleteScore.text = DataManager.instance.GetScore().ToString();
        levelCompleteBestScore.text = DataManager.instance.GetBestScore().ToString();

        ShowCG(levelCompleteCG);
    }

    private void HideLevelComplete()
    {
        HideCG(levelCompleteCG);
    }

    private void ShowGameover()
    {
        gameoverCoins.text = DataManager.instance.GetCoins().ToString();
        gameoverSecretWord.text = WordManager.instance.GetSecretWord();
        gameoverBestScore.text = DataManager.instance.GetBestScore().ToString();

        ShowCG(gameoverCG);
    }

    private void HideGameover()
    {
        HideCG(gameoverCG);
    }
    
     public void ShowSettings()
 	{
     	ShowCG(settingsCG);
 	}

 	public void HideSettings()
 	{
    	 HideCG(settingsCG);
 	}



    private void ShowCG(CanvasGroup cg)
    {
        cg.alpha = 1f;
        cg.interactable = true;
        cg.blocksRaycasts = true;
    }

    private void HideCG(CanvasGroup cg)
    {
        cg.alpha = 0f;
        cg.interactable = false;
        cg.blocksRaycasts = false;
    }
}