using UnityEngine;
using UnityEngine.SceneManagement;

namespace VRBeats
{
    // 모든 씬에서 자동 실행.
    // Game 씬: VRPointerController를 비활성 상태로 추가 → VR_InteractorController가 게임오버 시 활성화.
    // 나머지 씬: 바로 활성 상태로 추가.
    public class VRPointerSetup : MonoBehaviour
    {
        private static VRPointerSetup instance;

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.SubsystemRegistration)]
        private static void ResetStatics()
        {
            instance = null;
        }

        [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.BeforeSceneLoad)]
        private static void AutoInject()
        {
            if (instance != null)
                return;

            var go = new GameObject("[VRPointerSetup]");
            go.AddComponent<VRPointerSetup>();
        }

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

            instance = this;
            DontDestroyOnLoad(gameObject);
        }

        private void OnEnable()
        {
            SceneManager.sceneLoaded += OnSceneLoaded;
        }

        private void OnDisable()
        {
            SceneManager.sceneLoaded -= OnSceneLoaded;
        }

        private void Start()
        {
            SetupActiveScene();
        }

        private void OnSceneLoaded(Scene scene, LoadSceneMode mode)
        {
            SetupScene(scene);
        }

        private static void SetupActiveScene()
        {
            SetupScene(SceneManager.GetActiveScene());
        }

        private static void SetupScene(Scene scene)
        {
            bool isGameScene = scene.name == "Game";
            SetupControllers(disabledByDefault: isGameScene);
        }

        private static void SetupControllers(bool disabledByDefault)
        {
            foreach (var go in FindObjectsByType<GameObject>(FindObjectsSortMode.None))
            {
                string name = go.name;
                bool isRight = name.Contains("Right");
                bool isLeft  = name.Contains("Left");

                if (!isRight && !isLeft) continue;
                if (!name.Contains("Controller") && !name.Contains("Hand")) continue;
                if (go.GetComponent<LineRenderer>() == null) continue;
                if (go.GetComponent<VRPointerController>() != null) continue;

                var pointer = go.AddComponent<VRPointerController>();

                var field = typeof(VRPointerController)
                    .GetField("isRightHand",
                              System.Reflection.BindingFlags.NonPublic |
                              System.Reflection.BindingFlags.Instance);
                field?.SetValue(pointer, isRight);

                // Game 씬에서는 게임오버 전까지 비활성
                if (disabledByDefault)
                    pointer.enabled = false;

                Debug.Log($"[VRPointerSetup] {(isRight ? "Right" : "Left")} pointer 추가: {go.name} (enabled={!disabledByDefault})");
            }
        }
    }
}