using System;
using System.Runtime.InteropServices;
using UnityEngine;

/// <summary>
/// iOS WiFi 名称异步获取辅助类。
/// 自动请求位置权限（iOS 14+ NEHotspotNetwork 需要），
/// 用户授权后回调返回当前连接的 WiFi 名称，无需重新打开页面。
/// </summary>
public class iOSWiFiHelper : MonoBehaviour
{
    private static iOSWiFiHelper _instance;
    private static Action<string> _callback;

    /// <summary>
    /// 请求位置权限并获取当前 WiFi 名称，授权后异步回调。
    /// </summary>
    /// <param name="callback">回调参数为 WiFi SSID，获取失败或用户拒绝时为 null</param>
    public static void RequestWiFiSSID(Action<string> callback)
    {
        _callback = callback;
#if UNITY_IOS && !UNITY_EDITOR
        EnsureInstance();
        RequestWiFiSSIDNative(_instance.name, "OnWiFiSSIDResult");
#endif
    }

    private static void EnsureInstance()
    {
        if (_instance != null) return;
        var go = new GameObject("iOSWiFiHelper");
        DontDestroyOnLoad(go);
        _instance = go.AddComponent<iOSWiFiHelper>();
    }

    /// <summary>原生层通过 UnitySendMessage 回调此方法</summary>
    public void OnWiFiSSIDResult(string ssid)
    {
        var cb = _callback;
        _callback = null;
        cb?.Invoke(string.IsNullOrEmpty(ssid) ? null : ssid);
    }

#if UNITY_IOS && !UNITY_EDITOR
    [DllImport("__Internal")]
    private static extern void RequestWiFiSSIDNative(string gameObjectName, string methodName);
#endif
}