<?php

namespace FootyRoom\Http\Middleware;

use Closure;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Session\SessionManager;
use Illuminate\Contracts\Session\Session;
use Symfony\Component\HttpFoundation\Cookie;
use Symfony\Component\HttpFoundation\Response;

class StartSession
{
    /**
     * The session manager.
     *
     * @var \Illuminate\Session\SessionManager
     */
    protected $manager;

    /**
     * Indicates if the session was handled for the current request.
     *
     * @var bool
     */
    protected $sessionHandled = false;

    /**
     * Create a new session middleware.
     *
     * @param  \Illuminate\Session\SessionManager  $manager
     *
     * @return void
     */
    public function __construct(SessionManager $manager)
    {
        $this->manager = $manager;
    }

    /**
     * Handle an incoming request.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Closure  $next
     *
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        $this->sessionHandled = true;

        // If a session driver has been configured, we will need to start the session here
        // so that the data is ready for an application. Note that the Laravel sessions
        // do not make use of PHP "native" sessions in any way since they are crappy.
        $session = $this->startSession($request);

        $request->setLaravelSession($session);

        $response = $next($request);

        // Again, if the session has been configured we will need to close out the session
        // so that the attributes may be persisted to some storage medium. We will also
        // add the session identifier cookie to the application response headers now.
        $this->storeCurrentUrl($request, $session);

        $this->collectGarbage($session);

        if ($request->cookies->get($session->getName()) !== $session->getId()) {
            $this->addCookieToResponse($response, $session);
        }

        return $response;
    }

    /**
     * Perform any final actions for the request lifecycle.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Symfony\Component\HttpFoundation\Response  $response
     *
     * @return void
     */
    public function terminate(Request $request, Response $response)
    {
        if ($this->sessionHandled) {
            $this->manager->driver()->save();
        }
    }

    /**
     * Start the session for the given request.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return \Illuminate\Contracts\Session\Session
     */
    protected function startSession(Request $request)
    {
        with($session = $this->getSession($request))->setRequestOnHandler($request);

        $session->start();

        return $session;
    }

    /**
     * Get the session implementation from the manager.
     *
     * @param  \Illuminate\Http\Request  $request
     *
     * @return \Illuminate\Contracts\Session\Session
     */
    public function getSession(Request $request)
    {
        $session = $this->manager->driver();

        $session->setId($request->cookies->get($session->getName()));

        return $session;
    }

    /**
     * Store the current URL for the request if necessary.
     *
     * @param  \Illuminate\Http\Request  $request
     * @param  \Illuminate\Contracts\Session\Session  $session
     *
     * @return void
     */
    protected function storeCurrentUrl(Request $request, Session $session)
    {
        if ($request->method() === 'GET' && $request->route() && !$request->ajax()) {
            $session->setPreviousUrl($request->fullUrl());
        }
    }

    /**
     * Remove the garbage from the session if necessary.
     *
     * @param  \Illuminate\Contracts\Session\Session  $session
     *
     * @return void
     */
    protected function collectGarbage(Session $session)
    {
        $config = $this->manager->getSessionConfig();

        // Here we will see if this request hits the garbage collection lottery by hitting
        // the odds needed to perform garbage collection on any given request. If we do
        // hit it, we'll call this handler to let it delete all the expired sessions.
        if ($this->configHitsLottery($config)) {
            $session->getHandler()->gc($this->getSessionLifetimeInSeconds());
        }
    }

    /**
     * Determine if the configuration odds hit the lottery.
     *
     * @param  array  $config
     *
     * @return bool
     */
    protected function configHitsLottery(array $config)
    {
        return mt_rand(1, $config['lottery'][1]) <= $config['lottery'][0];
    }

    /**
     * Add the session cookie to the application response.
     *
     * @param  \Symfony\Component\HttpFoundation\Response  $response
     * @param  \Illuminate\Contracts\Session\Session  $session
     *
     * @return void
     */
    protected function addCookieToResponse(Response $response, Session $session)
    {
        $config = $this->manager->getSessionConfig();

        $response->headers->setCookie(new Cookie(
            $session->getName(),
            $session->getId(),
            $this->getCookieExpirationDate(),
            $config['path'],
            $config['domain'],
            array_get($config, 'secure', false),
            array_get($config, 'http_only', true)
        ));
    }

    /**
     * Get the session lifetime in seconds.
     *
     * @return int
     */
    protected function getSessionLifetimeInSeconds()
    {
        return array_get($this->manager->getSessionConfig(), 'lifetime') * 60;
    }

    /**
     * Get the cookie lifetime in seconds.
     *
     * @return int
     */
    protected function getCookieExpirationDate()
    {
        $config = $this->manager->getSessionConfig();

        return $config['expire_on_close'] ? 0 : Carbon::now()->addMinutes($config['lifetime']);
    }
}