using UnityEngine;
using UnityEngine.UI;

public class GoldSystem : MonoBehaviour
{
    public static GoldSystem Instance { get; private set; }

    [Header("金币配置")]
    [Min(0)] public int startingGold = 200;
    [Min(0)] public int maxGold = 9999;

    [Header("UI（可选）")]
    public Text goldText;

    public int CurrentGold { get; private set; }

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

        Instance = this;
        CurrentGold = startingGold;
        UpdateUI();
    }

    public bool TrySpend(int amount)
    {
        if (amount < 0 || CurrentGold < amount)
        {
            return false;
        }

        CurrentGold -= amount;
        UpdateUI();
        return true;
    }

    public void AddGold(int amount)
    {
        if (amount <= 0)
        {
            return;
        }

        CurrentGold = Mathf.Min(CurrentGold + amount, maxGold);
        UpdateUI();
    }

    private void UpdateUI()
    {
        if (goldText != null)
        {
            goldText.text = CurrentGold.ToString();
        }
    }
}