<?php
/**
 * LoginController.php
 * Copyright (c) 2020 james@firefly-iii.org
 *
 * This file is part of Firefly III (https://github.com/firefly-iii).
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */
declare(strict_types=1);

namespace FireflyIII\Http\Controllers\Auth;

use Adldap;
use Cookie;
use DB;
use FireflyIII\Exceptions\FireflyException;
use FireflyIII\Http\Controllers\Controller;
use FireflyIII\Providers\RouteServiceProvider;
use Illuminate\Contracts\Foundation\Application;
use Illuminate\Contracts\View\Factory;
use Illuminate\Contracts\View\View;
use Illuminate\Foundation\Auth\AuthenticatesUsers;
use Illuminate\Foundation\Auth\ThrottlesLogins;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Routing\Redirector;
use Illuminate\Validation\ValidationException;
use Log;

/**
 * Class LoginController
 *
 * 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.
 *
 * @codeCoverageIgnore
 */
class LoginController extends Controller
{
    use AuthenticatesUsers, ThrottlesLogins;

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

    private string $username;

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

    /**
     * Handle a login request to the application.
     *
     * @param Request $request
     *
     * @return JsonResponse|RedirectResponse
     *
     * @throws ValidationException
     */
    public function login(Request $request)
    {
        Log::channel('audit')->info(sprintf('User is trying to login using "%s"', $request->get($this->username())));
        Log::info('User is trying to login.');

        $guard = config('auth.defaults.guard');

        // if the user logs in using LDAP the field is also changed (per LDAP config)
        if ('ldap' === $guard) {
            Log::debug('User wishes to login using LDAP.');
            $this->username = config('firefly.ldap_auth_field');
        }


        $this->validateLogin($request);
        Log::debug('Login data is valid.');

        /** Copied directly from AuthenticatesUsers, but with logging added: */
        // If the class is using the ThrottlesLogins trait, we can automatically throttle
        // the login attempts for this application. We'll key this by the username and
        // the IP address of the client making these requests into this application.
        if (method_exists($this, 'hasTooManyLoginAttempts') && $this->hasTooManyLoginAttempts($request)) {
            Log::channel('audit')->info(sprintf('Login for user "%s" was locked out.', $request->get($this->username())));
            Log::error(sprintf('Login for user "%s" was locked out.', $request->get($this->username())));
            $this->fireLockoutEvent($request);

            $this->sendLockoutResponse($request);
        }
        /** Copied directly from AuthenticatesUsers, but with logging added: */
        if ($this->attemptLogin($request)) {
            Log::channel('audit')->info(sprintf('User "%s" has been logged in.', $request->get($this->username())));
            Log::debug(sprintf('Redirect after login is %s.', $this->redirectPath()));

            // if you just logged in, it can't be that you have a valid 2FA cookie.

            return $this->sendLoginResponse($request);
        }
        Log::warning('Login attempt failed.');

        /** Copied directly from AuthenticatesUsers, but with logging added: */
        // If the login attempt was unsuccessful we will increment the number of attempts
        // to login and redirect the user back to the login form. Of course, when this
        // user surpasses their maximum number of attempts they will get locked out.
        $this->incrementLoginAttempts($request);
        Log::channel('audit')->info(sprintf('Login failed. Attempt for user "%s" failed.', $request->get($this->username())));

        $this->sendFailedLoginResponse($request);
    }

    /**
     * Log the user out of the application.
     *
     * @param Request $request
     *
     * @return Response
     */
    public function logout(Request $request)
    {
        $authGuard = config('firefly.authentication_guard');
        $logoutUri = config('firefly.custom_logout_url');
        if ('remote_user_guard' === $authGuard && '' !== $logoutUri) {
            return redirect($logoutUri);
        }
        if ('remote_user_guard' === $authGuard && '' === $logoutUri) {
            session()->flash('error', trans('firefly.cant_logout_guard'));
        }

        // also logout current 2FA tokens.
        $cookieName = config('google2fa.cookie_name', 'google2fa_token');
        Cookie::forget($cookieName);

        $this->guard()->logout();

        $request->session()->invalidate();

        $request->session()->regenerateToken();

        if ($response = $this->loggedOut($request)) {
            return $response;
        }

        return $request->wantsJson()
            ? new Response('', 204)
            : redirect('/');
    }

    /**
     * Get the failed login response instance.
     *
     * @param Request $request
     *
     * @return void
     *
     * @throws ValidationException
     */
    protected function sendFailedLoginResponse(Request $request)
    {
        $exception             = ValidationException::withMessages(
            [
                $this->username() => [trans('auth.failed')],
            ]
        );
        $exception->redirectTo = route('login');

        throw $exception;
    }

    /**
     * Show the application's login form.
     *
     * @param Request $request
     *
     * @return Factory|Application|View|Redirector|RedirectResponse
     * @throws FireflyException
     */
    public function showLoginForm(Request $request)
    {
        Log::channel('audit')->info('Show login form (1.1).');

        $count = DB::table('users')->count();
        $guard = config('auth.defaults.guard');
        $title = (string)trans('firefly.login_page_title');

        if (0 === $count && 'web' === $guard) {
            return redirect(route('register'));
        }

        // switch to LDAP settings:
        if ('ldap' === $guard) {
            Log::debug('User wishes to login using LDAP.');
            $this->username = config('firefly.ldap_auth_field');
        }

        // throw warning if still using login_provider
        $ldapWarning = false;
        if ('ldap' === config('firefly.login_provider')) {
            $ldapWarning = true;
        }
        // is allowed to register, etc.
        $singleUserMode    = app('fireflyconfig')->get('single_user_mode', config('firefly.configuration.single_user_mode'))->data;
        $allowRegistration = true;
        $allowReset        = true;
        if (true === $singleUserMode && $count > 0) {
            $allowRegistration = false;
        }

        // single user mode is ignored when the user is not using eloquent:
        if ('web' !== $guard) {
            $allowRegistration = false;
            $allowReset        = false;
        }

        $email    = $request->old('email');
        $remember = $request->old('remember');

        $storeInCookie = config('google2fa.store_in_cookie', false);
        if (false !== $storeInCookie) {
            $cookieName = config('google2fa.cookie_name', 'google2fa_token');
            request()->cookies->set($cookieName, 'invalid');
        }
        $usernameField = $this->username();

        return prefixView('auth.login', compact('allowRegistration', 'email', 'remember', 'ldapWarning', 'allowReset', 'title', 'usernameField'));
    }

    /**
     * Get the login username to be used by the controller.
     *
     * @return string
     */
    public function username()
    {
        return $this->username;
    }
}