//
//  SignInWithGoogle.swift
//  SwApp
//
//  Created by Juan Alvarez on 11/24/21.
//

// NOTE: This Google Sign need is the not updated method from the instructions in the Firebase guide. We might need to revisit and update it accordingly.

import Foundation
import SwiftUI
import GoogleSignIn
import FirebaseAuth

class SignInWithGoogle: NSObject, GIDSignInDelegate {
    
    static let instance = SignInWithGoogle()
    var onboardingView: OnboardingView!
    
    func startSignInWithGoogleFlow(view: OnboardingView){
        self.onboardingView = view
        
        //let appDelegate = UIApplication.shared.delegate as! AppDelegate -->>> Option to replace rootViewController access.
        
        GIDSignIn.sharedInstance().delegate = self
        GIDSignIn.sharedInstance()?.presentingViewController = UIApplication.shared.windows.first?.rootViewController
        GIDSignIn.sharedInstance()?.presentingViewController.modalPresentationStyle = .fullScreen
        GIDSignIn.sharedInstance().signIn()
        
    }
    
    func sign(_ signIn: GIDSignIn!, didSignInFor user: GIDGoogleUser!, withError error: Error?) {
        // ...
        if let error = error {
            // ...
            print("ERROR SIGNING IN TO GOOGLE")
            self.onboardingView.showError.toggle()
            return
        }
        
        let fullName: String = user.profile.name
        let email: String = user.profile.email
        
        let idToken: String = user.authentication.idToken
        let accessToken: String = user.authentication.accessToken
        let credential = GoogleAuthProvider.credential(withIDToken: idToken, accessToken: accessToken)
        
        self.onboardingView.connectToFirebase(name: fullName, email: email, provider: "google", credential: credential)

    }
    
    func sign(_ signIn: GIDSignIn!, didDisconnectWith user: GIDGoogleUser!, withError error: Error!) {
        // Peform any operations when the user disconnects from the app here.
        // ...
        print("USER DISCONNECTED FROM GOOGLE")
        self.onboardingView.showError.toggle()
    }
    
}