using UnityEngine;
using UnityEngine.UI;
using Google;
using PlayFab;
using PlayFab.ClientModels;
using System.Threading.Tasks;

public class GoogleSignInManager : MonoBehaviour
{
    //#if UNITY_IOS
    //    private string webClientId = "723833850517-2j378fbm2a8u644p4qqod4qbi93dsgom.apps.googleusercontent.com"; // Replace with your actual Google Web Client ID
    //#elif UNITY_ANDROID
    //    private string webClientId = "723833850517-tfaer77vetml1bhv9qbj3o84ec52u45d.apps.googleusercontent.com"; // Replace with your actual Google Web Client ID
    //#endif
    //private string webClientId = "723833850517-865419enf8t0j1itln3cgmd1b67shsue.apps.googleusercontent.com";

    private GoogleSignInConfiguration configuration;
    public Bootstrapper bootstrapper; // Assign Bootstrapper in Inspector
    public Button googleSignInButton;
    void Awake()
    {
        // Set up the Google Sign-In configuration
        configuration = new GoogleSignInConfiguration
        {
            WebClientId = "723833850517-865419enf8t0j1itln3cgmd1b67shsue.apps.googleusercontent.com",
            RequestEmail = true,
            RequestIdToken = false,  // ❌ We no longer request IdToken, since we use ServerAuthCode instead
            RequestAuthCode = true   // ✅ Enable ServerAuthCode for secure backend authentication
        };

        GoogleSignIn.Configuration = configuration;
    }
    void Start()
    {

        if (PlayerPrefs.HasKey("PlayFabID"))
        {
            Debug.Log("User already signed in, attempting silent login...");
            SignInSilently();
        }
        else
        {
            Debug.Log("No saved PlayFab ID, waiting for user sign-in.");
            googleSignInButton.gameObject.SetActive(true);
            googleSignInButton.onClick.AddListener(SignInWithGoogle);
            SignInWithGoogle();
        }
    }

    public void SignInWithGoogle()
    {
        GoogleSignIn.DefaultInstance.SignIn().ContinueWith(OnGoogleSignIn);
    }

    private void OnGoogleSignIn(Task<GoogleSignInUser> task)
    {
        if (task.IsFaulted)
        {
            Debug.LogError("Google Sign-In encountered an error: " + task.Exception);
        }
        else if (task.IsCanceled)
        {
            Debug.Log("Google Sign-In was canceled.");
        }
        else
        {
            GoogleSignInUser user = task.Result;
            Debug.Log("✅ Google Sign-In succeeded!");
            Debug.Log("👤 Display Name: " + user.DisplayName);
            Debug.Log("📧 Email: " + user.Email);
            Debug.Log("🔑 Server Auth Code: " + user.AuthCode);
            string idToken = user.AuthCode;
            PlayerPrefs.SetString("GoogleIdToken", idToken); // Save Google Token for auto-login
            PlayerPrefs.Save();

            Debug.Log("Google Sign-In Successful! Fetching PlayFab login...");
            LoginToPlayFab(idToken);
            // 🔹 Send this AuthCode to your backend (PlayFab, Firebase, or custom server)
            // The backend will exchange this for an access token.
        }

           }

    private void LoginToPlayFab(string idToken)
    {
        var request = new LoginWithGoogleAccountRequest
        {
            TitleId = PlayFabSettings.TitleId,
            ServerAuthCode = idToken,
            CreateAccount = true
        };

        PlayFabClientAPI.LoginWithGoogleAccount(request, OnPlayFabLoginSuccess, OnPlayFabLoginFailure);
    }

    private void OnPlayFabLoginSuccess(LoginResult result)
    {
        Debug.Log("PlayFab Login Success! PlayFab ID: " + result.PlayFabId);

        // Save PlayFab ID to keep the user signed in automatically
        PlayerPrefs.SetString("PlayFabID", result.PlayFabId);
        PlayerPrefs.Save();

        // Start the game after login
        bootstrapper.StartGame();
    }

    private void OnPlayFabLoginFailure(PlayFabError error)
    {
        Debug.LogError("PlayFab Login Failed: " + error.GenerateErrorReport());
    }

    private void SignInSilently()
    {
        if (PlayerPrefs.HasKey("GoogleIdToken"))
        {
            Debug.Log("Attempting silent Google Sign-In...");
            string savedIdToken = PlayerPrefs.GetString("GoogleIdToken");
            LoginToPlayFab(savedIdToken); // Skip Google UI, go directly to PlayFab login
        }
        else
        {
            Debug.LogWarning("No Google ID Token saved, user must sign in manually.");
        }
    }

    public void SignOut()
    {
        Debug.Log("Signing out user...");

        // Clear stored login data
        PlayerPrefs.DeleteKey("PlayFabID");
        PlayerPrefs.DeleteKey("GoogleIdToken");
        PlayerPrefs.Save();

        // Sign out from Google
        GoogleSignIn.DefaultInstance.SignOut();

        Debug.Log("User signed out. They will need to log in again.");
    }
}