using UnityEngine;
using UnityEngine.UI;

/// <summary>
/// Отображает текущий статус найденных цифр кода лифта на игровом экране (HUD).
/// Например: "КОД ЛИФТА: [ 7 ] [ ? ] [ 1 ] [ ? ]"
/// </summary>
public class CodeHUDTracker : MonoBehaviour
{
    private static CodeHUDTracker _instance;
    public static CodeHUDTracker Instance
    {
        get
        {
            if (_instance == null)
            {
                _instance = Object.FindAnyObjectByType<CodeHUDTracker>(FindObjectsInactive.Include);
            }
            return _instance;
        }
    }

    [Header("Слоты для цифр")]
    [SerializeField] private Text[] digitSlotTexts = new Text[4];
    [SerializeField] private Image[] digitSlotBorders = new Image[4];

    [Header("Цвета")]
    public Color discoveredTextColor = new Color(1.0f, 0.85f, 0.1f, 1.0f); // Ярко-золотой
    public Color undiscoveredTextColor = new Color(0.45f, 0.45f, 0.45f, 0.7f); // Серый
    public Color discoveredBorderColor = new Color(1.0f, 0.85f, 0.1f, 0.8f);
    public Color undiscoveredBorderColor = new Color(0.3f, 0.3f, 0.3f, 0.4f);

    private void Awake()
    {
        _instance = this;
    }

    private void Start()
    {
        if (LevelCodeManager.Instance != null)
        {
            LevelCodeManager.Instance.OnDigitDiscovered += HandleDigitDiscovered;
        }
        RefreshDisplay();
    }

    private void OnDestroy()
    {
        if (LevelCodeManager.Instance != null)
        {
            LevelCodeManager.Instance.OnDigitDiscovered -= HandleDigitDiscovered;
        }
    }

    private void HandleDigitDiscovered(int pos, int val)
    {
        RefreshDisplay();
    }

    public void RefreshDisplay()
    {
        if (LevelCodeManager.Instance == null) return;

        for (int i = 0; i < 4; i++)
        {
            bool isDiscovered = LevelCodeManager.Instance.IsDigitDiscovered(i);
            int digit = LevelCodeManager.Instance.GetDigit(i);

            if (digitSlotTexts != null && i < digitSlotTexts.Length && digitSlotTexts[i] != null)
            {
                digitSlotTexts[i].text = isDiscovered ? digit.ToString() : "?";
                digitSlotTexts[i].color = isDiscovered ? discoveredTextColor : undiscoveredTextColor;
            }

            if (digitSlotBorders != null && i < digitSlotBorders.Length && digitSlotBorders[i] != null)
            {
                digitSlotBorders[i].color = isDiscovered ? discoveredBorderColor : undiscoveredBorderColor;
            }
        }
    }
}