<?php

namespace App\Http\Controllers\Auth;

use App\Http\Controllers\Controller;
use App\Providers\RouteServiceProvider;
use App\User;
use Illuminate\Http\Request;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Google_Client;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Hash;

class LoginController extends Controller
{
    /*
    |--------------------------------------------------------------------------
    | Login Controller
    |--------------------------------------------------------------------------
    |
    | This controller handles authenticating users for the application and
    | redirecting them to your home screen. The controller uses a trait
    | to conveniently provide its functionality to your applications.
    |
    */

    use AuthenticatesUsers;

    /**
     * Where to redirect users after login.
     *
     * @var string
     */
    protected $redirectTo = RouteServiceProvider::HOME;

    /**
     * Create a new controller instance.
     *
     * @return void
     */
    public function __construct()
    {
        $this->middleware('guest')->except('logout');
    }

    protected function validateLogin(Request $request)
    {
        if($request->exists('google_id_token')) {
            $request->validate([
                'google_id_token' => 'required|string'
            ]);
        } else {
            $request->validate([
                $this->username() => 'required|string',
                'password' => 'required|string',
            ]);
        }

    }

    public function login(Request $request)
    {
        // Validate request fields
        $this->validateLogin($request);

        // Find existed user by email
        $requestEmail = $request->get('email');
        $existedUser = User::where('email', $requestEmail)->first();

        if($existedUser) { // Login procedure
            if ($this->attemptLogin($request)) {
                return $this->sendLoginResponse($request);
            } else {
                $this->incrementLoginAttempts($request);
                return $this->sendFailedLoginResponse($request);
            }
        } else { // Register procedure
            $registerController = app(RegisterController::class);
            return $registerController->register($request);
        }
    }

    public function googleLogin(Request $request)
    {
        $this->validateLogin($request);

        // Initial Google API Client
        $googleClient = new Google_Client(['client_id' => config('app.googleApi.clientId')]);
        // Get request API token
        $googleIdToken = $request->get('google_id_token');
        // Verify token
        $payload = $googleClient->verifyIdToken($googleIdToken);

        if($payload) {
            $googleUserEmail = $payload['email'];
            $existedUser = User::where('email', $googleUserEmail)->first();
            if($existedUser) {
                Auth::login($existedUser);
            } else {
                $newUser = User::create([
                    'email' => $googleUserEmail,
                    'password' => Hash::make(substr($googleIdToken, 0, 20)),
                ]);
                Auth::login($newUser);
            }
            return redirect($this->redirectPath());
        } else {
            abort(403);
        }
    }

    protected function loggedOut(Request $request)
    {
        $request->session()->flash('loggedOut', true);
        return redirect($this->redirectPath());
    }
}