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

public class GoogleSignInManager : MonoBehaviour
{
    private GoogleSignInConfiguration configuration;
    public Bootstrapper bootstrapper; // Assign in Inspector
    public Button googleSignInButton;

    void Awake()
    {
        configuration = new GoogleSignInConfiguration
        {
            WebClientId = "723833850517-865419enf8t0j1itln3cgmd1b67shsue.apps.googleusercontent.com",
            RequestEmail = true,
            RequestAuthCode = true
        };

        GoogleSignIn.Configuration = configuration;
        Application.quitting += SyncPlayerPrefsToPlayFabOnQuit;
    }

    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.RemoveAllListeners();
            googleSignInButton.onClick.AddListener(SignInWithGoogle);
        }
    }

    public void SignInWithGoogle()
    {
        googleSignInButton.interactable = false;
        GoogleSignIn.DefaultInstance.SignIn().ContinueWith(OnGoogleSignIn);
    }

    private void OnGoogleSignIn(Task<GoogleSignInUser> task)
    {
        if (task.IsFaulted || task.IsCanceled)
        {
            Debug.LogError("Google Sign-In failed: " + task.Exception);

            // ✅ Show the sign-in button again
            googleSignInButton.gameObject.SetActive(true);
            googleSignInButton.interactable = true;
            googleSignInButton.onClick.RemoveAllListeners();
            googleSignInButton.onClick.AddListener(SignInWithGoogle);
            return;
        }

        GoogleSignInUser user = task.Result;
        string authCode = user.AuthCode;
        PlayerPrefs.SetString("GoogleAuthCode", authCode);
        PlayerPrefsKeys.RegisterKey("GoogleAuthCode");
        PlayerPrefs.Save();

        LoginToPlayFab(authCode);
    }

    private void SignInSilently()
    {
        if (PlayerPrefs.HasKey("GoogleAuthCode"))
        {
            string authCode = PlayerPrefs.GetString("GoogleAuthCode");
            LoginToPlayFab(authCode);
        }
        else
        {
            Debug.LogWarning("No Google AuthCode found for silent sign-in.");
            googleSignInButton.gameObject.SetActive(true);
            googleSignInButton.onClick.RemoveAllListeners();
            googleSignInButton.onClick.AddListener(SignInWithGoogle);
        }
    }

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

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

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

        PlayerPrefs.SetString("PlayFabID", result.PlayFabId);
        PlayerPrefsKeys.RegisterKey("PlayFabID");
        PlayerPrefs.Save();

        LoadPlayerPrefsFromPlayFab(() =>
        {
            googleSignInButton.gameObject.SetActive(false);
            bootstrapper.StartGame(); // Start the game after loading
        });
    }

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

        // ✅ Re-enable button so player can retry
        googleSignInButton.gameObject.SetActive(true);
        googleSignInButton.interactable = true;
        googleSignInButton.onClick.RemoveAllListeners();
        googleSignInButton.onClick.AddListener(SignInWithGoogle);
    }

    private void LoadPlayerPrefsFromPlayFab(Action onComplete)
    {
        PlayFabClientAPI.GetUserData(new GetUserDataRequest(), result =>
        {
            if (result.Data != null)
            {
                foreach (var entry in result.Data)
                {
                    PlayerPrefs.SetString(entry.Key, entry.Value.Value);
                    PlayerPrefsKeys.RegisterKey(entry.Key);
                }

                PlayerPrefs.Save();
                Debug.Log("✅ Loaded PlayerPrefs from PlayFab.");
            }
            else
            {
                Debug.Log("ℹ️ No saved PlayerPrefs found in PlayFab.");
            }

            onComplete?.Invoke();
        },
        error =>
        {
            Debug.LogError("❌ Failed to load PlayerPrefs from PlayFab: " + error.GenerateErrorReport());
            onComplete?.Invoke();
        });
    }

    private void SyncPlayerPrefsToPlayFabOnQuit()
    {
        Dictionary<string, string> allPrefs = new Dictionary<string, string>();

        foreach (var key in PlayerPrefsKeys.GetAllKeys())
        {
            allPrefs[key] = PlayerPrefs.GetString(key);
        }

        var request = new UpdateUserDataRequest
        {
            Data = allPrefs
        };

        PlayFabClientAPI.UpdateUserData(request,
            result => Debug.Log("✅ Synced PlayerPrefs to PlayFab on quit."),
            error => Debug.LogError("❌ Failed to sync PlayerPrefs on quit: " + error.GenerateErrorReport()));
    }

    public void SignOut()
    {
        PlayerPrefs.DeleteKey("PlayFabID");
        PlayerPrefs.DeleteKey("GoogleAuthCode");
        PlayerPrefs.Save();

        GoogleSignIn.DefaultInstance.SignOut();
        Debug.Log("User signed out.");
    }
}