using System;
using System.Threading.Tasks;
using Kill.Utils;
using UnityEngine;

#if UNITY_ANDROID && !UNITY_EDITOR
using Firebase;
using Firebase.Auth;
#endif

namespace Kill.Managers
{
    /// <summary>
    /// Firebase 谷歌登录管理器
    /// 使用 Firebase 内置的 Google 登录支持
    /// </summary>
    public class FirebaseAuthManager : MonoBehaviour
    {
        public static FirebaseAuthManager Instance { get; private set; }

        // Google 登录配置 - 从 Firebase 控制台获取的 Web 客户端 ID
        private const string WEB_CLIENT_ID = "785438724947-kpjbqi43hbj6eddianbjsgkgkkclkfmd.apps.googleusercontent.com";

#if UNITY_ANDROID && !UNITY_EDITOR
        private FirebaseAuth auth;
#endif

        private void Awake()
        {
            Instance = this;
            InitializeFirebase();
        }

        /// <summary>
        /// 初始化 Firebase
        /// </summary>
        private void InitializeFirebase()
        {
#if UNITY_ANDROID && !UNITY_EDITOR
            FirebaseApp.CheckAndFixDependenciesAsync().ContinueWith(task =>
            {
                var dependencyStatus = task.Result;
                if (dependencyStatus == DependencyStatus.Available)
                {
                    auth = FirebaseAuth.DefaultInstance;
                    Debug.Log("Firebase 初始化成功");
                }
                else
                {
                    Debug.LogError($"Firebase 初始化失败: {dependencyStatus}");
                }
            });
#else
            Debug.Log("Firebase 谷歌登录仅在 Android 平台可用");
#endif
        }

        /// <summary>
        /// 谷歌登录
        /// 使用 Firebase 内置的 Google 登录弹窗
        /// </summary>
        public void SignInWithGoogle(Action<GoogleLoginResult> onSuccess, Action<string> onError)
        {
#if UNITY_ANDROID && !UNITY_EDITOR
            if (auth == null)
            {
                onError?.Invoke("Firebase 未初始化");
                return;
            }

            // 获取 Google 登录 Provider
            var provider = new FederatedOAuthProviderData("google.com");
            provider.Scopes = new string[] { "email", "profile" };
            
            var federatedProvider = new FederatedOAuthProvider(provider);

            auth.SignInWithProviderAsync(federatedProvider).ContinueWith(task =>
            {
                if (task.IsFaulted)
                {
                    MainThread.Enqueue(() => onError?.Invoke("Google 登录失败"));
                    return;
                }
                
                if (task.IsCanceled)
                {
                    MainThread.Enqueue(() => onError?.Invoke("Google 登录被取消"));
                    return;
                }

                var user = auth.CurrentUser;
                if (user == null)
                {
                    MainThread.Enqueue(() => onError?.Invoke("获取用户信息失败"));
                    return;
                }

                // 构造登录结果
                MainThread.Enqueue(() =>
                {
                    var result = new GoogleLoginResult
                    {
                        FirebaseUserId = user.UserId,
                        Email = user.Email,
                        DisplayName = user.DisplayName,
                        PhotoUrl = user.PhotoUrl?.ToString(),
                        IdToken = ""
                    };
                    onSuccess?.Invoke(result);
                });
            });
#else
            // 编辑器环境下模拟
            Task.Delay(1000).ContinueWith(_ =>
            {
                Debug.Log("编辑器模拟谷歌登录");
                MainThread.Enqueue(() =>
                {
                    var mockResult = new GoogleLoginResult
                    {
                        FirebaseUserId = "mock_firebase_user_id_12345",
                        Email = "mock@gmail.com",
                        DisplayName = "Mock User",
                        PhotoUrl = "",
                        IdToken = ""
                    };
                    onSuccess?.Invoke(mockResult);
                });
            });
#endif
        }

        /// <summary>
        /// 谷歌登出
        /// </summary>
        public void SignOut()
        {
#if UNITY_ANDROID && !UNITY_EDITOR
            auth?.SignOut();
            Debug.Log("谷歌登出成功");
#endif
        }
    }

    /// <summary>
    /// 谷歌登录结果
    /// </summary>
    public class GoogleLoginResult
    {
        public string FirebaseUserId;   // Firebase 用户ID（用于绑定）
        public string Email;            // 邮箱
        public string DisplayName;      // 显示名称
        public string PhotoUrl;         // 头像URL
        public string IdToken;          // ID Token
    }
}