using UnityEngine;
using UnityEngine.UI;

namespace RR.Common.UI.FX
{
    /// <summary>
    /// Автоматически добавляет базовые UI-эффекты к интерактивным элементам.
    /// </summary>
    [AddComponentMenu("RR/UI/FX/UI FX Runtime Installer")]
    public sealed class UIFXRuntimeInstaller : MonoBehaviour
    {
        private const string RuntimeObjectName = "UI FX Runtime Installer";

        private static UIFXRuntimeInstaller _instance;

        [SerializeField, Min(0.1f)] private float scanInterval = 0.5f;

        private float _nextScanTime;

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        private static void Bootstrap()
        {
            if (_instance != null)
            {
                return;
            }

            GameObject installerObject = new(RuntimeObjectName);
            installerObject.AddComponent<UIFXRuntimeInstaller>();
            DontDestroyOnLoad(installerObject);
        }

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

            _instance = this;
            DontDestroyOnLoad(gameObject);
        }

        private void Update()
        {
            if (Time.unscaledTime < _nextScanTime)
            {
                return;
            }

            _nextScanTime = Time.unscaledTime + scanInterval;
            InstallButtonGlow();
        }

        private static void InstallButtonGlow()
        {
            Button[] buttons = FindObjectsByType<Button>(FindObjectsInactive.Exclude, FindObjectsSortMode.None);
            foreach (Button button in buttons)
            {
                if (button == null || button.GetComponent<UISelectableFocusGlow>() != null)
                {
                    continue;
                }

                button.gameObject.AddComponent<UISelectableFocusGlow>();
            }
        }
    }
}