bansonic_beta_main/Assets/scripts/UI/Panel/dontdestroyonload/btmandtopController.cs

using UnityEngine;
using UnityEngine.UI;
using UnityEngine.Events;

public class btmandtopController : MonoBehaviour
{
    [Header("player unique so")]
    public Player_SO player_SO;
    [Header("put prefabs here")]
    public GameObject putPrefabsHere;
    [Header("son buttons")]
    public Button settings_launch;
    public Button userInfo_launch;
    public Button store_launch;
    public Button showLevel_display;
    public Button email_display;
    public Button notice_display;

    [Header("sig prefabs")]
    public GameObject showLevel_prefab;
    public GameObject store_prefab;
    public GameObject settings_prefab;
    public GameObject userInfo_prefab;
    public GameObject email_prefab;
    public GameObject notice_prefab;

    private UnityAction instantiateSettings;
    private UnityAction instantiateUserInfo;
    private UnityAction instantiateStore;
    private UnityAction instantiateShowLevel;
    private UnityAction instantiateEmail;
    private UnityAction instantiateNotice;

    // cached reference to the settings instance to ensure only one exists
    private GameObject settingsInstance;

    void Start()
    {
        instantiateSettings = () => ToggleSettingsPrefab();
        instantiateUserInfo = () => InstantiatePrefab(userInfo_prefab);
        instantiateStore = () => InstantiatePrefab(store_prefab);
        instantiateShowLevel = () => InstantiatePrefab(showLevel_prefab);
        instantiateEmail = () => InstantiatePrefab(email_prefab);
        instantiateNotice = () => InstantiatePrefab(notice_prefab);

        if (settings_launch != null)
            settings_launch.onClick.AddListener(instantiateSettings);
        if (userInfo_launch != null)
            userInfo_launch.onClick.AddListener(instantiateUserInfo);
        if (store_launch != null)
            store_launch.onClick.AddListener(instantiateStore);
        if (showLevel_display != null)
            showLevel_display.onClick.AddListener(instantiateShowLevel);
        if (email_display != null)
            email_display.onClick.AddListener(instantiateEmail);
        if (notice_display != null)
            notice_display.onClick.AddListener(instantiateNotice);

        // Pre-instantiate settings prefab and keep it inactive, ensuring only one exists
        if (settings_prefab != null && putPrefabsHere != null)
        {
            // Try to find existing one in scene first
            if (settingsInstance == null)
            {
                var existing = GameObject.Find(settings_prefab.name + "(Clone)");
                if (existing != null)
                {
                    settingsInstance = existing;
                }
            }

            if (settingsInstance == null)
            {
                settingsInstance = Instantiate(settings_prefab, putPrefabsHere.transform);
                settingsInstance.SetActive(false);

                // try to set canvas camera now as in previous behavior
                try
                {
                    Canvas c = settingsInstance.GetComponentInChildren<Canvas>(true);
                    if (c != null)
                    {
                        Camera[] cams = GameObject.FindObjectsOfType<Camera>();
                        if (cams != null && cams.Length > 0)
                        {
                            c.worldCamera = cams[0];
                        }
                        cams = null;
                        c = null;
                    }
                }
                catch { }
            }
            else
            {
                // ensure it's parented correctly under putPrefabsHere
                settingsInstance.transform.SetParent(putPrefabsHere.transform, false);
                settingsInstance.SetActive(false);
            }
        }
    }

    void OnDestroy()
    {
        if (settings_launch != null)
            settings_launch.onClick.RemoveListener(instantiateSettings);
        if (userInfo_launch != null)
            userInfo_launch.onClick.RemoveListener(instantiateUserInfo);
        if (store_launch != null)
            store_launch.onClick.RemoveListener(instantiateStore);
        if (showLevel_display != null)
            showLevel_display.onClick.RemoveListener(instantiateShowLevel);
        if (email_display != null)
            email_display.onClick.RemoveListener(instantiateEmail);
        if (notice_display != null)
            notice_display.onClick.RemoveListener(instantiateNotice);
    }

    private void ToggleSettingsPrefab()
    {
        if (settings_prefab == null || putPrefabsHere == null) return;

        // If we don't have an instance (it may have been destroyed), instantiate one
        if (settingsInstance == null)
        {
            settingsInstance = Instantiate(settings_prefab, putPrefabsHere.transform);

            // attempt to set canvas camera
            try
            {
                Canvas c = settingsInstance.GetComponentInChildren<Canvas>(true);
                if (c != null)
                {
                    Camera[] cams = GameObject.FindObjectsOfType<Camera>();
                    if (cams != null && cams.Length > 0)
                    {
                        c.worldCamera = cams[0];
                    }
                    cams = null;
                    c = null;
                }
            }
            catch { }

            settingsInstance.SetActive(true);
            return;
        }

        // Toggle active state
        bool active = settingsInstance.activeSelf;
        settingsInstance.SetActive(!active);
    }

    private void InstantiatePrefab(GameObject prefab)
    {
        if (prefab != null && putPrefabsHere != null)
        {
            GameObject instance = Instantiate(prefab, putPrefabsHere.transform);
            instance = null;
        }
    }
}