TigerProject/Assets/Scripts/Shop/CoinManager.cs

using UnityEngine;
using TMPro;

public class CoinManager : MonoBehaviour
{
    public static CoinManager Instance;

    public int startingCoins = 0;

    [SerializeField]
    private int currentCoins;

    [Header("UI")]
    public TMP_Text coinText;

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

        currentCoins = startingCoins;
        UpdateCoinUI();
    }

    public void AddCoins(int amount)
    {
        currentCoins += amount;
        UpdateCoinUI();
    }

    public bool TrySpendCoins(int amount)
    {
        if (currentCoins >= amount)
        {
            currentCoins -= amount;
            UpdateCoinUI();
            return true;
        }

        return false;
    }

    public int GetCoins()
    {
        return currentCoins;
    }

    private void UpdateCoinUI()
    {
        if (coinText != null)
        {
            coinText.text = $"{currentCoins} G";
        }
    }
}