using System;
using Firebase.Auth;
using Google;
using UnityEngine;
using System.Threading.Tasks;
using Firebase.Extensions;
using PlayFab;
using PlayFab.ClientModels;
using UnityEngine.UI;

public class GoogleSignInHandler : MonoBehaviour
{
    private FirebaseAuth auth;
    private GoogleSignInConfiguration configuration;
    [SerializeField] private Button googleSignInButton;

    private void OnEnable()
    {
        googleSignInButton.onClick.AddListener(SignInWithGoogle);
    }

    private void OnDisable()
    {
        googleSignInButton.onClick.RemoveListener(SignInWithGoogle);
    }

    void Start()
    {
        PlayFabSettings.staticSettings.TitleId = GameConstants.PlayfabTitleId;
        auth = FirebaseAuth.DefaultInstance;
        configuration = new GoogleSignInConfiguration
        {
            WebClientId = GameConstants.WebClientID,
            RequestEmail = true,
            RequestAuthCode = true,
            RequestIdToken = true
        };
        GoogleSignIn.Configuration = configuration;
        GoogleSignIn.DefaultInstance.EnableDebugLogging(true);
    }

    private void SignInWithGoogle()
    {
        if (GoogleSignIn.Configuration == null)
        {
            Debug.LogWarning("Google Sign-In Configuration is not set.");
            return;
        }

        GoogleSignIn.DefaultInstance.SignIn().ContinueWith(OnGoogleSignIn);
    }

    private void OnGoogleSignIn(Task<GoogleSignInUser> task)
    {
        if (task.IsFaulted || task.IsCanceled || task.Result == null)
        {
            Debug.LogError("Google Sign-In failed.");
            return;
        }

        // Firebase uses ID token
        var firebaseCredential = GoogleAuthProvider.GetCredential(task.Result.IdToken, null);
        FirebaseAuth.DefaultInstance.SignInWithCredentialAsync(firebaseCredential).ContinueWith(authTask =>
        {
            if (authTask.IsCompleted && !authTask.IsFaulted)
            {
                Debug.Log("Firebase sign-in successful");

                // PlayFab uses ServerAuthCode
                var request = new LoginWithGoogleAccountRequest
                {
                    TitleId = PlayFabSettings.staticSettings.TitleId,
                    ServerAuthCode = task.Result.AuthCode,
                    CreateAccount = true
                };

                PlayFabClientAPI.LoginWithGoogleAccount(request, OnPlayFabLoginSuccess, OnPlayFabLoginFailure);
            }
            else
            {
                Debug.LogError("Firebase sign-in failed: " + authTask.Exception);
            }
        });
    }
    private void OnPlayFabLoginSuccess(LoginResult result)
    {
        Debug.Log("✅ PlayFab Login Success! PlayFab ID: " + result.PlayFabId);

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

    }

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

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