lsh4/Assets/Scripts/UI/GoldPickupNotifier.cs

using UnityEngine;
using TMPro;

public class GoldPickupNotifier : MonoBehaviour
{
    public static GoldPickupNotifier Instance;
    
    public GameObject messagePanel;
    public TextMeshProUGUI messageText;
    public float displayDuration = 2f;
    public float fadeSpeed = 1f;
    
    private float timer;
    private CanvasGroup canvasGroup;
    
    void Awake()
    {
        if (Instance == null)
        {
            Instance = this;
        }
        else
        {
            Destroy(gameObject);
        }
    }
    
    void Start()
    {
        if (messagePanel)
        {
            canvasGroup = messagePanel.GetComponent<CanvasGroup>();
            if (!canvasGroup) canvasGroup = messagePanel.AddComponent<CanvasGroup>();
            canvasGroup.alpha = 0;
            messagePanel.SetActive(false);
        }
    }
    
    public static void Show(int goldAmount)
    {
        if (Instance) Instance.ShowMessage(goldAmount);
    }
    
    void ShowMessage(int amount)
    {
        if (!messagePanel || !messageText) return;
        
        messageText.text = $"+{amount} Gold ";
        messagePanel.SetActive(true);
        canvasGroup.alpha = 1;
        timer = displayDuration;
    }
    
    void Update()
    {
        if (timer > 0)
        {
            timer -= Time.deltaTime;
            
            if (timer <= fadeSpeed)
            {
                canvasGroup.alpha = timer / fadeSpeed;
            }
            
            if (timer <= 0)
            {
                messagePanel.SetActive(false);
            }
        }
    }
}