<?php

/**
 * Patch testing component for the Joomla! CMS
 *
 * @copyright  Copyright (C) 2011 - 2012 Ian MacLennan, Copyright (C) 2013 - 2018 Open Source Matters, Inc. All rights reserved.
 * @license    GNU General Public License version 2 or later
 */

namespace Joomla\Component\Patchtester\Administrator\Controller;

use Joomla\CMS\Factory;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Response\JsonResponse;
use Joomla\CMS\Session\Session;
use Joomla\Component\Patchtester\Administrator\Helper\Helper;
use Joomla\Component\Patchtester\Administrator\Model\TestsModel;

// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Controller class to start fetching remote data
 *
 * @since  2.0
 */
class StartfetchController extends AbstractController
{
    /**
     * Execute the controller.
     *
     * @return  void  Redirects the application
     *
     * @since   2.0
     */
    public function execute()
    {
        // We don't want this request to be cached.
        $this->getApplication()->setHeader('Expires', 'Mon, 1 Jan 2001 00:00:00 GMT', true);
        $this->getApplication()->setHeader('Last-Modified', gmdate('D, d M Y H:i:s') . ' GMT', true);
        $this->getApplication()->setHeader('Cache-Control', 'no-store, no-cache, must-revalidate, post-check=0, pre-check=0', false);
        $this->getApplication()->setHeader('Pragma', 'no-cache');
        $this->getApplication()->setHeader('Content-Type', $this->getApplication()->mimeType . '; charset=' . $this->getApplication()->charSet);
// Check for a valid token. If invalid, send a 403 with the error message.
        if (!Session::checkToken('request')) {
            $response = new JsonResponse(new \Exception(Text::_('JINVALID_TOKEN'), 403));
            $this->getApplication()->sendHeaders();
            echo json_encode($response);
            $this->getApplication()->close(1);
        }

        // Make sure we can fetch the data from GitHub - throw an error on < 10 available requests
        try {
            $rateResponse = Helper::initializeGithub()->getRateLimit();
            $rate         = json_decode($rateResponse->body);
        } catch (\Exception $e) {
            $response = new JsonResponse(new \Exception(Text::sprintf('COM_PATCHTESTER_COULD_NOT_CONNECT_TO_GITHUB', $e->getMessage()), $e->getCode(), $e));
            $this->getApplication()->sendHeaders();
            echo json_encode($response);
            $this->getApplication()->close(1);
        }

        // If over the API limit, we can't build this list
        if ($rate->resources->core->remaining < 10) {
            $response = new JsonResponse(new \Exception(Text::sprintf('COM_PATCHTESTER_API_LIMIT_LIST', Factory::getDate($rate->resources->core->reset)), 429));
            $this->getApplication()->sendHeaders();
            echo json_encode($response);
            $this->getApplication()->close(1);
        }

        $testsModel = new TestsModel(null, Factory::getDbo());
        try {
        // Sanity check, ensure there aren't any applied patches
            if (count($testsModel->getAppliedPatches()) >= 1) {
                $response = new JsonResponse(new \Exception(Text::_('COM_PATCHTESTER_ERROR_APPLIED_PATCHES'), 500));
                $this->getApplication()->sendHeaders();
                echo json_encode($response);
                $this->getApplication()->close(1);
            }
        } catch (\Exception $e) {
            $response = new JsonResponse($e);
            $this->getApplication()->sendHeaders();
            echo json_encode($response);
            $this->getApplication()->close(1);
        }

        // We're able to successfully pull data, prepare our environment
        Factory::getSession()->set('com_patchtester_fetcher_page', 1);
        $response = new JsonResponse(array('complete' => false, 'header' => Text::_('COM_PATCHTESTER_FETCH_PROCESSING', true)), Text::sprintf('COM_PATCHTESTER_FETCH_PAGE_NUMBER', 1), false, true);
        $this->getApplication()->sendHeaders();
        echo json_encode($response);
        $this->getApplication()->close();
    }
}