class AggregatorTestBase

abstract class AggregatorTestBase extends BrowserTestBase {
    
    /**
     * A user with permission to administer feeds and create content.
     *
     * @var \Drupal\user\Entity\User
     */
    protected $adminUser;
    
    /**
     * Modules to install.
     *
     * @var array
     */
    public static $modules = [
        'block',
        'node',
        'aggregator',
        'aggregator_test',
        'views',
    ];
    
    /**
     * {@inheritdoc}
     */
    protected function setUp() {
        parent::setUp();
        // Create an Article node type.
        if ($this->profile != 'standard') {
            $this->drupalCreateContentType([
                'type' => 'article',
                'name' => 'Article',
            ]);
        }
        $this->adminUser = $this->drupalCreateUser([
            'access administration pages',
            'administer news feeds',
            'access news feeds',
            'create article content',
        ]);
        $this->drupalLogin($this->adminUser);
        $this->drupalPlaceBlock('local_tasks_block');
    }
    
    /**
     * Creates an aggregator feed.
     *
     * This method simulates the form submission on path aggregator/sources/add.
     *
     * @param string $feed_url
     *   (optional) If given, feed will be created with this URL, otherwise
     *   /rss.xml will be used. Defaults to NULL.
     * @param array $edit
     *   Array with additional form fields.
     *
     * @return \Drupal\aggregator\FeedInterface
     *   Full feed object if possible.
     *
     * @see getFeedEditArray()
     */
    public function createFeed($feed_url = NULL, array $edit = []) {
        $edit = $this->getFeedEditArray($feed_url, $edit);
        $this->drupalPostForm('aggregator/sources/add', $edit, t('Save'));
        $this->assertText(t('The feed @name has been added.', [
            '@name' => $edit['title[0][value]'],
        ]), new FormattableMarkup('The feed @name has been added.', [
            '@name' => $edit['title[0][value]'],
        ]));
        // Verify that the creation message contains a link to a feed.
        $view_link = $this->xpath('//div[@class="messages"]//a[contains(@href, :href)]', [
            ':href' => 'aggregator/sources/',
        ]);
        $this->assert(isset($view_link), 'The message area contains a link to a feed');
        $fids = \Drupal::entityQuery('aggregator_feed')->condition('title', $edit['title[0][value]'])
            ->condition('url', $edit['url[0][value]'])
            ->execute();
        $this->assertNotEmpty($fids, 'The feed found in database.');
        return Feed::load(array_values($fids)[0]);
    }
    
    /**
     * Deletes an aggregator feed.
     *
     * @param \Drupal\aggregator\FeedInterface $feed
     *   Feed object representing the feed.
     */
    public function deleteFeed(FeedInterface $feed) {
        $this->drupalPostForm('aggregator/sources/' . $feed->id() . '/delete', [], t('Delete'));
        $this->assertRaw(t('The feed %title has been deleted.', [
            '%title' => $feed->label(),
        ]), 'Feed deleted successfully.');
    }
    
    /**
     * Returns a randomly generated feed edit array.
     *
     * @param string $feed_url
     *   (optional) If given, feed will be created with this URL, otherwise
     *   /rss.xml will be used. Defaults to NULL.
     * @param array $edit
     *   Array with additional form fields.
     *
     * @return array
     *   A feed array.
     */
    public function getFeedEditArray($feed_url = NULL, array $edit = []) {
        $feed_name = $this->randomMachineName(10);
        if (!$feed_url) {
            $feed_url = Url::fromRoute('view.frontpage.feed_1', [], [
                'query' => [
                    'feed' => $feed_name,
                ],
                'absolute' => TRUE,
            ])->toString();
        }
        $edit += [
            'title[0][value]' => $feed_name,
            'url[0][value]' => $feed_url,
            'refresh' => '900',
        ];
        return $edit;
    }
    
    /**
     * Returns a randomly generated feed edit object.
     *
     * @param string $feed_url
     *   (optional) If given, feed will be created with this URL, otherwise
     *   /rss.xml will be used. Defaults to NULL.
     * @param array $values
     *   (optional) Default values to initialize object properties with.
     *
     * @return \Drupal\aggregator\FeedInterface
     *   A feed object.
     */
    public function getFeedEditObject($feed_url = NULL, array $values = []) {
        $feed_name = $this->randomMachineName(10);
        if (!$feed_url) {
            $feed_url = Url::fromRoute('view.frontpage.feed_1', [
                'query' => [
                    'feed' => $feed_name,
                ],
                'absolute' => TRUE,
            ])->toString();
        }
        $values += [
            'title' => $feed_name,
            'url' => $feed_url,
            'refresh' => '900',
        ];
        return Feed::create($values);
    }
    
    /**
     * Returns the count of the randomly created feed array.
     *
     * @return int
     *   Number of feed items on default feed created by createFeed().
     */
    public function getDefaultFeedItemCount() {
        // Our tests are based off of rss.xml, so let's find out how many elements
        // should be related.
        $feed_count = \Drupal::entityQuery('node')->condition('promote', NodeInterface::PROMOTED)
            ->condition('status', NodeInterface::PUBLISHED)
            ->accessCheck(FALSE)
            ->range(0, $this->config('system.rss')
            ->get('items.limit'))
            ->count()
            ->execute();
        return min($feed_count, 10);
    }
    
    /**
     * Updates the feed items.
     *
     * This method simulates a click to
     * admin/config/services/aggregator/update/$fid.
     *
     * @param \Drupal\aggregator\FeedInterface $feed
     *   Feed object representing the feed.
     * @param int|null $expected_count
     *   Expected number of feed items. If omitted no check will happen.
     */
    public function updateFeedItems(FeedInterface $feed, $expected_count = NULL) {
        // First, let's ensure we can get to the rss xml.
        $this->drupalGet($feed->getUrl());
        $this->assertSession()
            ->statusCodeEquals(200);
        // Attempt to access the update link directly without an access token.
        $this->drupalGet('admin/config/services/aggregator/update/' . $feed->id());
        $this->assertSession()
            ->statusCodeEquals(403);
        // Refresh the feed (simulated link click).
        $this->drupalGet('admin/config/services/aggregator');
        $this->clickLink('Update items');
        // Ensure we have the right number of items.
        $item_ids = \Drupal::entityQuery('aggregator_item')->condition('fid', $feed->id())
            ->execute();
        $feed->items = array_values($item_ids);
        if ($expected_count !== NULL) {
            $feed->item_count = count($feed->items);
            $this->assertEqual($expected_count, $feed->item_count, new FormattableMarkup('Total items in feed equal to the total items in database (@val1 != @val2)', [
                '@val1' => $expected_count,
                '@val2' => $feed->item_count,
            ]));
        }
    }
    
    /**
     * Confirms an item removal from a feed.
     *
     * @param \Drupal\aggregator\FeedInterface $feed
     *   Feed object representing the feed.
     */
    public function deleteFeedItems(FeedInterface $feed) {
        $this->drupalPostForm('admin/config/services/aggregator/delete/' . $feed->id(), [], t('Delete items'));
        $this->assertRaw(t('The news items from %title have been deleted.', [
            '%title' => $feed->label(),
        ]), 'Feed items deleted.');
    }
    
    /**
     * Adds and deletes feed items and ensure that the count is zero.
     *
     * @param \Drupal\aggregator\FeedInterface $feed
     *   Feed object representing the feed.
     * @param int $expected_count
     *   Expected number of feed items.
     */
    public function updateAndDelete(FeedInterface $feed, $expected_count) {
        $count_query = \Drupal::entityQuery('aggregator_item')->condition('fid', $feed->id())
            ->count();
        $this->updateFeedItems($feed, $expected_count);
        $count = $count_query->execute();
        $this->assertGreaterThan(0, $count);
        $this->deleteFeedItems($feed);
        $count = $count_query->execute();
        $this->assertEquals(0, $count);
    }
    
    /**
     * Checks whether the feed name and URL are unique.
     *
     * @param string $feed_name
     *   String containing the feed name to check.
     * @param string $feed_url
     *   String containing the feed url to check.
     *
     * @return bool
     *   TRUE if feed is unique.
     */
    public function uniqueFeed($feed_name, $feed_url) {
        $result = \Drupal::entityQuery('aggregator_feed')->condition('title', $feed_name)
            ->condition('url', $feed_url)
            ->count()
            ->execute();
        return 1 == $result;
    }
    
    /**
     * Creates a valid OPML file from an array of feeds.
     *
     * @param array $feeds
     *   An array of feeds.
     *
     * @return string
     *   Path to valid OPML file.
     */
    public function getValidOpml(array $feeds) {
        // Properly escape URLs so that XML parsers don't choke on them.
        foreach ($feeds as &$feed) {
            $feed['url[0][value]'] = Html::escape($feed['url[0][value]']);
        }
        
        /**
         * Does not have an XML declaration, must pass the parser.
         */
        $opml = <<<EOF
<opml version="1.0">
  <head></head>
  <body>
    <!-- First feed to be imported. -->
    <outline text="{<span class="php-variable">$feeds</span>[<span class="php-constant">0</span>][<span class="php-string">'title[0][value]'</span>]}" xmlurl="{<span class="php-variable">$feeds</span>[<span class="php-constant">0</span>][<span class="php-string">'url[0][value]'</span>]}" />

    <!-- Second feed. Test string delimitation and attribute order. -->
    <outline xmlurl='{<span class="php-variable">$feeds</span>[<span class="php-constant">1</span>][<span class="php-string">'url[0][value]'</span>]}' text='{<span class="php-variable">$feeds</span>[<span class="php-constant">1</span>][<span class="php-string">'title[0][value]'</span>]}'/>

    <!-- Test for duplicate URL and title. -->
    <outline xmlurl="{<span class="php-variable">$feeds</span>[<span class="php-constant">0</span>][<span class="php-string">'url[0][value]'</span>]}" text="Duplicate URL"/>
    <outline xmlurl="http://duplicate.title" text="{<span class="php-variable">$feeds</span>[<span class="php-constant">1</span>][<span class="php-string">'title[0][value]'</span>]}"/>

    <!-- Test that feeds are only added with required attributes. -->
    <outline text="{<span class="php-variable">$feeds</span>[<span class="php-constant">2</span>][<span class="php-string">'title[0][value]'</span>]}" />
    <outline xmlurl="{<span class="php-variable">$feeds</span>[<span class="php-constant">2</span>][<span class="php-string">'url[0][value]'</span>]}" />
  </body>
</opml>
EOF;
        $path = 'public://valid-opml.xml';
        // Add the UTF-8 byte order mark.
        return \Drupal::service('file_system')->saveData(chr(239) . chr(187) . chr(191) . $opml, $path);
    }
    
    /**
     * Creates an invalid OPML file.
     *
     * @return string
     *   Path to invalid OPML file.
     */
    public function getInvalidOpml() {
        $opml = <<<EOF
<opml>
  <invalid>
</opml>
EOF;
        $path = 'public://invalid-opml.xml';
        return \Drupal::service('file_system')->saveData($opml, $path);
    }
    
    /**
     * Creates a valid but empty OPML file.
     *
     * @return string
     *   Path to empty OPML file.
     */
    public function getEmptyOpml() {
        $opml = <<<EOF
<?xml version="1.0" encoding="utf-8"?>
<opml version="1.0">
  <head></head>
  <body>
    <outline text="Sample text" />
    <outline text="Sample text" url="Sample URL" />
  </body>
</opml>
EOF;
        $path = 'public://empty-opml.xml';
        return \Drupal::service('file_system')->saveData($opml, $path);
    }
    
    /**
     * Returns a example RSS091 feed.
     *
     * @return string
     *   Path to the feed.
     */
    public function getRSS091Sample() {
        return $GLOBALS['base_url'] . '/' . drupal_get_path('module', 'aggregator') . '/tests/modules/aggregator_test/aggregator_test_rss091.xml';
    }
    
    /**
     * Returns a example Atom feed.
     *
     * @return string
     *   Path to the feed.
     */
    public function getAtomSample() {
        // The content of this sample ATOM feed is based directly off of the
        // example provided in RFC 4287.
        return $GLOBALS['base_url'] . '/' . drupal_get_path('module', 'aggregator') . '/tests/modules/aggregator_test/aggregator_test_atom.xml';
    }
    
    /**
     * Returns a example feed.
     *
     * @return string
     *   Path to the feed.
     */
    public function getHtmlEntitiesSample() {
        return $GLOBALS['base_url'] . '/' . drupal_get_path('module', 'aggregator') . '/tests/modules/aggregator_test/aggregator_test_title_entities.xml';
    }
    
    /**
     * Creates sample article nodes.
     *
     * @param int $count
     *   (optional) The number of nodes to generate. Defaults to five.
     */
    public function createSampleNodes($count = 5) {
        // Post $count article nodes.
        for ($i = 0; $i < $count; $i++) {
            $edit = [];
            $edit['title[0][value]'] = $this->randomMachineName();
            $edit['body[0][value]'] = $this->randomMachineName();
            $this->drupalPostForm('node/add/article', $edit, t('Save'));
        }
    }
    
    /**
     * Enable the plugins coming with aggregator_test module.
     */
    public function enableTestPlugins() {
        $this->config('aggregator.settings')
            ->set('fetcher', 'aggregator_test_fetcher')
            ->set('parser', 'aggregator_test_parser')
            ->set('processors', [
            'aggregator_test_processor' => 'aggregator_test_processor',
            'aggregator' => 'aggregator',
        ])
            ->save();
    }

}