<?php

namespace App\Http\Controllers;

use Log;
use Mail;
use View;
use Utils;
use Cookie;
use Option;
use Session;
use App\Events;
use App\Models\User;
use Illuminate\Http\Request;
use App\Exceptions\PrettyPageException;
use App\Services\Repositories\UserRepository;

class AuthController extends Controller
{
    public function login()
    {
        return view('auth.login');
    }

    public function handleLogin(Request $request, UserRepository $users)
    {
        $this->validate($request, [
            'identification' => 'required',
            'password'       => 'required|min:6|max:16'
        ]);

        $identification = $request->input('identification');

        // guess type of identification
        $auth_type = (validate($identification, 'email')) ? "email" : "username";

        event(new Events\UserTryToLogin($identification, $auth_type));

        // Get user instance from repository.
        // If the given identification is not registered yet,
        // it will return a null value.
        $user = $users->get($identification, $auth_type);

        if (session('login_fails', 0) > 3) {
            if (strtolower($request->input('captcha')) != strtolower(session('phrase')))
                return json(trans('auth.validation.captcha'), 1);
        }

        if (!$user) {
            return json(trans('auth.validation.user'), 2);
        } else {
            if ($user->checkPasswd($request->input('password'))) {
                Session::forget('login_fails');

                Session::put('uid'  , $user->uid);
                Session::put('token', $user->getToken());

                // time in minutes
                $time = $request->input('keep') == true ? 10080 : 60;

                event(new Events\UserLoggedIn($user));

                return json(trans('auth.login.success'), 0, [
                    'token' => $user->getToken()
                ]) // set cookies
                ->withCookie('uid', $user->uid, $time)
                ->withCookie('token', $user->getToken(), $time);
            } else {
                Session::put('login_fails', session('login_fails', 0) + 1);

                return json(trans('auth.validation.password'), 1, [
                    'login_fails' => session('login_fails')
                ]);
            }
        }
    }

    public function logout(Request $request)
    {
        if ($request->hasSession()) {
            // flush sessions
            Session::flush();

            // delete cookies
            return json(trans('auth.logout.success'), 0)
                    ->withCookie(Cookie::forget('uid'))
                    ->withCookie(Cookie::forget('token'));
        } else {
            return json(trans('auth.logout.fail'), 1);
        }
    }

    public function register()
    {
        if (option('user_can_register')) {
            return view('auth.register');
        } else {
            throw new PrettyPageException(trans('auth.register.close'), 7);
        }
    }

    public function handleRegister(Request $request, UserRepository $users)
    {
        if (!$this->checkCaptcha($request))
            return json(trans('auth.validation.captcha'), 1);

        $this->validate($request, [
            'email'    => 'required|email',
            'password' => 'required|min:8|max:16',
            'nickname' => 'required|nickname|max:255'
        ]);

        if (!option('user_can_register')) {
            return json(trans('auth.register.close'), 7);
        }

        // If amount of registered accounts of IP is more than allowed amounts,
        // then reject the register.
        if (User::where('ip', Utils::getClientIp())->count() < option('regs_per_ip'))
        {
            // Register a new user.
            // If the email is already registered,
            // it will return a false value.
            $user = User::register(
                $request->input('email'),
                $request->input('password'), function($user) use ($request)
            {
                $user->ip           = Utils::getClientIp();
                $user->score        = option('user_initial_score');
                $user->register_at  = Utils::getTimeFormatted();
                $user->last_sign_at = Utils::getTimeFormatted(time() - 86400);
                $user->permission   = User::NORMAL;
                $user->nickname     = $request->input('nickname');
            });

            if (!$user) {
                return json(trans('auth.register.registered'), 5);
            }

            event(new Events\UserRegistered($user));

            return json([
                'errno' => 0,
                'msg'   => trans('auth.register.success'),
                'token' => $user->getToken()
            ]) // set cookies
            ->withCookie('uid', $user->uid, 60)
            ->withCookie('token', $user->getToken(), 60);

        } else {
            return json(trans('auth.register.max', ['regs' => option('regs_per_ip')]), 7);
        }
    }

    public function forgot()
    {
        if (config('mail.host') != "") {
            return view('auth.forgot');
        } else {
            throw new PrettyPageException(trans('auth.forgot.close'), 8);
        }
    }

    public function handleForgot(Request $request, UserRepository $users)
    {
        if (!$this->checkCaptcha($request))
            return json(trans('auth.validation.captcha'), 1);

        if (config('mail.host') == "")
            return json(trans('auth.forgot.close'), 1);

        if (Session::has('last_mail_time') && (time() - session('last_mail_time')) < 60)
            return json(trans('auth.forgot.frequent-mail'), 1);

        // get user instance
        $user = $users->get($request->input('email'), 'email');

        if (!$user)
            return json(trans('auth.forgot.unregistered'), 1);

        $uid = $user->uid;
        // generate token for password resetting
        $token = base64_encode($user->getToken().substr(time(), 4, 6).Utils::generateRndString(16));

        $url = Option::get('site_url')."/auth/reset?uid=$uid&token=$token";

        try {
            Mail::send('auth.mail', ['reset_url' => $url], function ($m) use ($request) {
                $site_name = Option::get('site_name');

                $m->from(config('mail.username'), $site_name);
                $m->to($request->input('email'))->subject(trans('auth.mail.title', ['sitename' => $site_name]));
            });

            Log::info("[Password Reset] Mail has been sent to [{$request->input('email')}] with token [$token]");
        } catch(\Exception $e) {
            return json(trans('auth.mail.failed', ['msg' => $e->getMessage()]), 2);
        }

        Session::put('last_mail_time', time());

        return json(trans('auth.mail.success'), 0);
    }

    public function reset(UserRepository $users, Request $request)
    {
        if ($request->has('uid') && $request->has('token')) {
            // get user instance from repository
            $user = $users->get($request->input('uid'));

            if (!$user)
                return redirect('auth/forgot')->with('msg', trans('auth.reset.invalid'));

            // unpack to get user token & timestamp
            $encrypted = base64_decode($request->input('token'));
            $token     = substr($encrypted, 0, -22);
            $timestamp = substr($encrypted, strlen($token), 6);

            if ($user->getToken() != $token) {
                return redirect('auth/forgot')->with('msg', trans('auth.reset.invalid'));
            }

            // more than 1 hour
            if ((substr(time(), 4, 6) - $timestamp) > 3600) {
                return redirect('auth/forgot')->with('msg', trans('auth.reset.expired'));
            }

            return view('auth.reset')->with('user', $user);
        } else {
            return redirect('auth/login')->with('msg', trans('auth.check.anonymous'));
        }
    }

    public function handleReset(Request $request, UserRepository $users)
    {
        $this->validate($request, [
            'uid'      => 'required|integer',
            'password' => 'required|min:8|max:16',
        ]);

        $users->get($request->input('uid'))->changePasswd($request->input('password'));

        Log::info("[Password Reset] Password of user [{$request->input('uid')}] has been changed");

        return json(trans('auth.reset.success'), 0);
    }

    public function captcha()
    {
        $builder = new \Gregwar\Captcha\CaptchaBuilder;
        $builder->build($width = 100, $height = 34);
        Session::put('phrase', $builder->getPhrase());
        $builder->output();

        return \Response::png();
    }

    protected function checkCaptcha($request)
    {
        return (strtolower($request->input('captcha')) == strtolower(session('phrase')));
    }

}