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;
    public Button googleSignInButton;
    public Button guestLoginButton;

    void Awake()
    {
        configuration = new GoogleSignInConfiguration
        {
            WebClientId = "1044061384825-kervrjq8gcopk6ijs69qnm4jqeh7rj7r.apps.googleusercontent.com",
            RequestEmail = true,
            RequestAuthCode = true
        };

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

    void Start()
    {
        googleSignInButton.onClick.RemoveAllListeners();
        googleSignInButton.onClick.AddListener(SignInWithGoogle);

        guestLoginButton.onClick.RemoveAllListeners();
        guestLoginButton.onClick.AddListener(GuestLogin);

        if (PlayerPrefs.HasKey("PlayFabID") && !PlayerPrefs.HasKey("GuestMode"))
        {
            Debug.Log("User previously signed in with Google. Attempting silent login...");
            googleSignInButton.gameObject.SetActive(false);
            guestLoginButton.gameObject.SetActive(false);
            SignInSilently();
        }
        else if (PlayerPrefs.HasKey("GuestMode"))
        {
            Debug.Log("Guest mode previously selected. Letting user choose again.");
            googleSignInButton.gameObject.SetActive(true);
            guestLoginButton.gameObject.SetActive(true);
        }
        else
        {
            Debug.Log("No login info found. Showing login options.");
            googleSignInButton.gameObject.SetActive(true);
            guestLoginButton.gameObject.SetActive(true);
        }
    }

    public void GuestLogin()
    {
        Debug.Log("Starting game in Guest Mode...");
        SafePlayerPrefs.SetInt("GuestMode", 1);
        PlayerPrefs.Save();

        googleSignInButton.gameObject.SetActive(false);
        guestLoginButton.gameObject.SetActive(false);

        bootstrapper.StartGame();
    }

    public void SignInWithGoogle()
    {
        PlayerPrefs.DeleteKey("GuestMode");
        PlayerPrefs.DeleteAll();
        PlayerPrefs.Save();

        googleSignInButton.interactable = false;
        guestLoginButton.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);

            googleSignInButton.gameObject.SetActive(true);
            googleSignInButton.interactable = true;

            guestLoginButton.gameObject.SetActive(true);
            guestLoginButton.interactable = true;
            return;
        }

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

        LoginToPlayFab(authCode);
    }

    private void SignInSilently()
    {
        Debug.Log("Attempting Google Silent Sign-In...");

        GoogleSignIn.DefaultInstance.SignInSilently().ContinueWith(task =>
        {
            if (task.IsFaulted || task.IsCanceled)
            {
                Debug.LogWarning("Silent Sign-In failed. Showing login buttons.");
                googleSignInButton.gameObject.SetActive(true);
                googleSignInButton.interactable = true;

                guestLoginButton.gameObject.SetActive(true);
                guestLoginButton.interactable = true;
                return;
            }

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

            LoginToPlayFab(authCode);
        });
    }

    private void LoginToPlayFab(string authCode)
    {
        PlayFabSettings.staticSettings.TitleId = "1819C6";
        var request = new LoginWithGoogleAccountRequest
        {
            TitleId = "1819C6",
            ServerAuthCode = authCode,
            CreateAccount = true
        };

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

    private void OnPlayFabLoginSuccess(LoginResult result)
    {
        Debug.Log("✅ PlayFab Login Success! PlayFab ID: " + result.PlayFabId);
        SafePlayerPrefs.SetString("PlayFabID", result.PlayFabId);
        PlayerPrefs.Save();

        LoadPlayerPrefsFromPlayFab(() =>
        {
            googleSignInButton.gameObject.SetActive(false);
            guestLoginButton.gameObject.SetActive(false);
            bootstrapper.StartGame();
        });
    }

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

        googleSignInButton.gameObject.SetActive(true);
        googleSignInButton.interactable = true;

        guestLoginButton.gameObject.SetActive(true);
        guestLoginButton.interactable = true;
    }

    private void LoadPlayerPrefsFromPlayFab(Action onComplete)
    {
        PlayFabClientAPI.GetUserData(new GetUserDataRequest(), result =>
        {
            if (result.Data != null)
            {
                foreach (var entry in result.Data)
                {
                    string key = entry.Key;
                    string rawValue = entry.Value.Value;

                    if (rawValue.StartsWith("int:") && int.TryParse(rawValue.Substring(4), out int i))
                        SafePlayerPrefs.SetInt(key, i);
                    else if (rawValue.StartsWith("float:") && float.TryParse(rawValue.Substring(6), out float f))
                        SafePlayerPrefs.SetFloat(key, f);
                    else if (rawValue.StartsWith("string:"))
                        SafePlayerPrefs.SetString(key, rawValue.Substring(7));
                    else
                        SafePlayerPrefs.SetString(key, rawValue);

                    PlayerPrefsKeys.RegisterKey(key);
                }
                PlayerPrefs.Save();
            }

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

    private void SyncPlayerPrefsToPlayFabOnQuit()
    {
        if (PlayerPrefs.HasKey("GuestMode")) return;

        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 SafePlayerPrefs to PlayFab on quit."),
            error => Debug.LogError("❌ Failed to sync SafePlayerPrefs: " + error.GenerateErrorReport()));
    }

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

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