class CommentPagerTest

class CommentPagerTest extends CommentTestBase {
    
    /**
     * {@inheritdoc}
     */
    protected $defaultTheme = 'stark';
    
    /**
     * Confirms comment paging works correctly with flat and threaded comments.
     */
    public function testCommentPaging() {
        $this->drupalLogin($this->adminUser);
        // Set comment variables.
        $this->setCommentForm(TRUE);
        $this->setCommentSubject(TRUE);
        $this->setCommentPreview(DRUPAL_DISABLED);
        // Create a node and three comments.
        $node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
        ]);
        $comments = [];
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT, 'Comment paging changed.');
        // Set comments to one per page so that we are able to test paging without
        // needing to insert large numbers of comments.
        $this->setCommentsPerPage(1);
        // Check the first page of the node, and confirm the correct comments are
        // shown.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->pageTextContains('next');
        $this->assertTrue($this->commentExists($comments[0]), 'Comment 1 appears on page 1.');
        $this->assertFalse($this->commentExists($comments[1]), 'Comment 2 does not appear on page 1.');
        $this->assertFalse($this->commentExists($comments[2]), 'Comment 3 does not appear on page 1.');
        // Check the second page.
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 1,
            ],
        ]);
        $this->assertTrue($this->commentExists($comments[1]), 'Comment 2 appears on page 2.');
        $this->assertFalse($this->commentExists($comments[0]), 'Comment 1 does not appear on page 2.');
        $this->assertFalse($this->commentExists($comments[2]), 'Comment 3 does not appear on page 2.');
        // Check the third page.
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 2,
            ],
        ]);
        $this->assertTrue($this->commentExists($comments[2]), 'Comment 3 appears on page 3.');
        $this->assertFalse($this->commentExists($comments[0]), 'Comment 1 does not appear on page 3.');
        $this->assertFalse($this->commentExists($comments[1]), 'Comment 2 does not appear on page 3.');
        // Post a reply to the oldest comment and test again.
        $oldest_comment = reset($comments);
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $oldest_comment->id());
        $reply = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $this->setCommentsPerPage(2);
        // We are still in flat view - the replies should not be on the first page,
        // even though they are replies to the oldest comment.
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 0,
            ],
        ]);
        $this->assertFalse($this->commentExists($reply, TRUE), 'In flat mode, reply does not appear on page 1.');
        // If we switch to threaded mode, the replies on the oldest comment
        // should be bumped to the first page and comment 6 should be bumped
        // to the second page.
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Switched to threaded mode.');
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 0,
            ],
        ]);
        $this->assertTrue($this->commentExists($reply, TRUE), 'In threaded mode, reply appears on page 1.');
        $this->assertFalse($this->commentExists($comments[1]), 'In threaded mode, comment 2 has been bumped off of page 1.');
        // If (# replies > # comments per page) in threaded expanded view,
        // the overage should be bumped.
        $reply2 = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 0,
            ],
        ]);
        $this->assertFalse($this->commentExists($reply2, TRUE), 'In threaded mode where # replies > # comments per page, the newest reply does not appear on page 1.');
        // Test that the page build process does not somehow generate errors when
        // # comments per page is set to 0.
        $this->setCommentsPerPage(0);
        $this->drupalGet('node/' . $node->id(), [
            'query' => [
                'page' => 0,
            ],
        ]);
        $this->assertFalse($this->commentExists($reply2, TRUE), 'Threaded mode works correctly when comments per page is 0.');
        $this->drupalLogout();
    }
    
    /**
     * Confirms comment paging works correctly with flat and threaded comments.
     */
    public function testCommentPermalink() {
        $this->drupalLogin($this->adminUser);
        // Set comment variables.
        $this->setCommentForm(TRUE);
        $this->setCommentSubject(TRUE);
        $this->setCommentPreview(DRUPAL_DISABLED);
        // Create a node and three comments.
        $node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
        ]);
        $comments = [];
        $comments[] = $this->postComment($node, 'comment 1: ' . $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, 'comment 2: ' . $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, 'comment 3: ' . $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT, 'Comment paging changed.');
        // Set comments to one per page so that we are able to test paging without
        // needing to insert large numbers of comments.
        $this->setCommentsPerPage(1);
        // Navigate to each comment permalink as anonymous and assert it appears on
        // the page.
        foreach ($comments as $index => $comment) {
            $this->drupalGet($comment->toUrl());
            $this->assertTrue($this->commentExists($comment), sprintf('Comment %d appears on page %d.', $index + 1, $index + 1));
        }
    }
    
    /**
     * Tests comment ordering and threading.
     */
    public function testCommentOrderingThreading() {
        $this->drupalLogin($this->adminUser);
        // Set comment variables.
        $this->setCommentForm(TRUE);
        $this->setCommentSubject(TRUE);
        $this->setCommentPreview(DRUPAL_DISABLED);
        // Display all the comments on the same page.
        $this->setCommentsPerPage(1000);
        // Create a node and three comments.
        $node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
        ]);
        $comments = [];
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the second comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[1]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the first comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[0]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the last comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[2]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the second comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[3]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // At this point, the comment tree is:
        // - 0
        //   - 4
        // - 1
        //   - 3
        //     - 6
        // - 2
        //   - 5
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT, 'Comment paging changed.');
        $expected_order = [
            0,
            1,
            2,
            3,
            4,
            5,
            6,
        ];
        $this->drupalGet('node/' . $node->id());
        $this->assertCommentOrder($comments, $expected_order);
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Switched to threaded mode.');
        $expected_order = [
            0,
            4,
            1,
            3,
            6,
            2,
            5,
        ];
        $this->drupalGet('node/' . $node->id());
        $this->assertCommentOrder($comments, $expected_order);
    }
    
    /**
     * Asserts that the comments are displayed in the correct order.
     *
     * @param \Drupal\comment\CommentInterface[] $comments
     *   An array of comments, must be of the type CommentInterface.
     * @param array $expected_order
     *   An array of keys from $comments describing the expected order.
     *
     * @internal
     */
    public function assertCommentOrder(array $comments, array $expected_order) : void {
        $expected_cids = [];
        // First, rekey the expected order by cid.
        foreach ($expected_order as $key) {
            $expected_cids[] = $comments[$key]->id();
        }
        $comment_anchors = $this->xpath('//article[starts-with(@id,"comment-")]');
        $result_order = [];
        foreach ($comment_anchors as $anchor) {
            $result_order[] = substr($anchor->getAttribute('id'), 8);
        }
        $this->assertEquals($expected_cids, $result_order, new FormattableMarkup('Comment order: expected @expected, returned @returned.', [
            '@expected' => implode(',', $expected_cids),
            '@returned' => implode(',', $result_order),
        ]));
    }
    
    /**
     * Tests calculation of first page with new comment.
     */
    public function testCommentNewPageIndicator() {
        $this->drupalLogin($this->adminUser);
        // Set comment variables.
        $this->setCommentForm(TRUE);
        $this->setCommentSubject(TRUE);
        $this->setCommentPreview(DRUPAL_DISABLED);
        // Set comments to one per page so that we are able to test paging without
        // needing to insert large numbers of comments.
        $this->setCommentsPerPage(1);
        // Create a node and three comments.
        $node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
        ]);
        $comments = [];
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        $comments[] = $this->postComment($node, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the second comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[1]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the first comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[0]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // Post a reply to the last comment.
        $this->drupalGet('comment/reply/node/' . $node->id() . '/comment/' . $comments[2]->id());
        $comments[] = $this->postComment(NULL, $this->randomMachineName(), $this->randomMachineName(), TRUE);
        // At this point, the comment tree is:
        // - 0
        //   - 4
        // - 1
        //   - 3
        // - 2
        //   - 5
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT, 'Comment paging changed.');
        $expected_pages = [
            // Page of comment 5
1 => 5,
            // Page of comment 4
2 => 4,
            // Page of comment 3
3 => 3,
            // Page of comment 2
4 => 2,
            // Page of comment 1
5 => 1,
            // Page of comment 0
6 => 0,
        ];
        $node = Node::load($node->id());
        foreach ($expected_pages as $new_replies => $expected_page) {
            $returned_page = \Drupal::entityTypeManager()->getStorage('comment')
                ->getNewCommentPageNumber($node->get('comment')->comment_count, $new_replies, $node, 'comment');
            $this->assertSame($expected_page, $returned_page, new FormattableMarkup('Flat mode, @new replies: expected page @expected, returned page @returned.', [
                '@new' => $new_replies,
                '@expected' => $expected_page,
                '@returned' => $returned_page,
            ]));
        }
        $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_THREADED, 'Switched to threaded mode.');
        $expected_pages = [
            // Page of comment 5
1 => 5,
            // Page of comment 4
2 => 1,
            // Page of comment 4
3 => 1,
            // Page of comment 4
4 => 1,
            // Page of comment 4
5 => 1,
            // Page of comment 0
6 => 0,
        ];
        \Drupal::entityTypeManager()->getStorage('node')
            ->resetCache([
            $node->id(),
        ]);
        $node = Node::load($node->id());
        foreach ($expected_pages as $new_replies => $expected_page) {
            $returned_page = \Drupal::entityTypeManager()->getStorage('comment')
                ->getNewCommentPageNumber($node->get('comment')->comment_count, $new_replies, $node, 'comment');
            $this->assertEquals($expected_page, $returned_page, new FormattableMarkup('Threaded mode, @new replies: expected page @expected, returned page @returned.', [
                '@new' => $new_replies,
                '@expected' => $expected_page,
                '@returned' => $returned_page,
            ]));
        }
    }
    
    /**
     * Confirms comment paging works correctly with two pagers.
     */
    public function testTwoPagers() {
        // Add another field to article content-type.
        $this->addDefaultCommentField('node', 'article', 'comment_2');
        // Set default to display comment list with unique pager id.
        \Drupal::service('entity_display.repository')->getViewDisplay('node', 'article')
            ->setComponent('comment_2', [
            'label' => 'hidden',
            'type' => 'comment_default',
            'weight' => 30,
            'settings' => [
                'pager_id' => 1,
                'view_mode' => 'default',
            ],
        ])
            ->save();
        // Make sure pager appears in formatter summary and settings form.
        $account = $this->drupalCreateUser([
            'administer node display',
        ]);
        $this->drupalLogin($account);
        $this->drupalGet('admin/structure/types/manage/article/display');
        // No summary for standard pager.
        $this->assertSession()
            ->pageTextNotContains('Pager ID: 0');
        $this->assertSession()
            ->pageTextContains('Pager ID: 1');
        $this->submitForm([], 'comment_settings_edit');
        // Change default pager to 2.
        $this->submitForm([
            'fields[comment][settings_edit_form][settings][pager_id]' => 2,
        ], 'Save');
        $this->assertSession()
            ->pageTextContains('Pager ID: 2');
        // Revert the changes.
        $this->submitForm([], 'comment_settings_edit');
        $this->submitForm([
            'fields[comment][settings_edit_form][settings][pager_id]' => 0,
        ], 'Save');
        // No summary for standard pager.
        $this->assertSession()
            ->pageTextNotContains('Pager ID: 0');
        $this->drupalLogin($this->adminUser);
        // Add a new node with both comment fields open.
        $node = $this->drupalCreateNode([
            'type' => 'article',
            'promote' => 1,
            'uid' => $this->webUser
                ->id(),
        ]);
        // Set comment options.
        $comments = [];
        foreach ([
            'comment',
            'comment_2',
        ] as $field_name) {
            $this->setCommentForm(TRUE, $field_name);
            $this->setCommentPreview(DRUPAL_OPTIONAL, $field_name);
            $this->setCommentSettings('default_mode', CommentManagerInterface::COMMENT_MODE_FLAT, 'Comment paging changed.', $field_name);
            // Set comments to one per page so that we are able to test paging without
            // needing to insert large numbers of comments.
            $this->setCommentsPerPage(1, $field_name);
            for ($i = 1; $i <= 4; $i++) {
                $comment = "Comment {$i} on field {$field_name}";
                $comments[] = $this->postComment($node, $comment, $comment, TRUE, $field_name);
            }
        }
        // Check the first page of the node, and confirm the correct comments are
        // shown.
        $this->drupalGet('node/' . $node->id());
        $this->assertSession()
            ->pageTextContains('next');
        $this->assertSession()
            ->pageTextContains('Comment 1 on field comment');
        $this->assertSession()
            ->pageTextContains('Comment 1 on field comment_2');
        // Navigate to next page of field 1.
        $this->clickLinkWithXPath('//h3/a[normalize-space(text())=:label]/ancestor::section[1]//a[@rel="next"]', [
            ':label' => 'Comment 1 on field comment',
        ]);
        // Check only one pager updated.
        $this->assertSession()
            ->pageTextContains('Comment 2 on field comment');
        $this->assertSession()
            ->pageTextContains('Comment 1 on field comment_2');
        // Return to page 1.
        $this->drupalGet('node/' . $node->id());
        // Navigate to next page of field 2.
        $this->clickLinkWithXPath('//h3/a[normalize-space(text())=:label]/ancestor::section[1]//a[@rel="next"]', [
            ':label' => 'Comment 1 on field comment_2',
        ]);
        // Check only one pager updated.
        $this->assertSession()
            ->pageTextContains('Comment 1 on field comment');
        $this->assertSession()
            ->pageTextContains('Comment 2 on field comment_2');
        // Navigate to next page of field 1.
        $this->clickLinkWithXPath('//h3/a[normalize-space(text())=:label]/ancestor::section[1]//a[@rel="next"]', [
            ':label' => 'Comment 1 on field comment',
        ]);
        // Check only one pager updated.
        $this->assertSession()
            ->pageTextContains('Comment 2 on field comment');
        $this->assertSession()
            ->pageTextContains('Comment 2 on field comment_2');
    }
    
    /**
     * Follows a link found at a give xpath query.
     *
     * Will click the first link found with the given xpath query by default,
     * or a later one if an index is given.
     *
     * If the link is discovered and clicked, the test passes. Fail otherwise.
     *
     * @param string $xpath
     *   Xpath query that targets an anchor tag, or set of anchor tags.
     * @param array $arguments
     *   An array of arguments with keys in the form ':name' matching the
     *   placeholders in the query. The values may be either strings or numeric
     *   values.
     * @param int $index
     *   Link position counting from zero.
     *
     * @return string|false
     *   Page contents on success, or FALSE on failure.
     *
     * @see \Drupal\Tests\UiHelperTrait::clickLink()
     */
    protected function clickLinkWithXPath($xpath, $arguments = [], $index = 0) {
        $url_before = $this->getUrl();
        $urls = $this->xpath($xpath, $arguments);
        if (isset($urls[$index])) {
            $url_target = $this->getAbsoluteUrl($urls[$index]->getAttribute('href'));
            return $this->drupalGet($url_target);
        }
        $this->fail(new FormattableMarkup('Link %label does not exist on @url_before', [
            '%label' => $xpath,
            '@url_before' => $url_before,
        ]), 'Browser');
        return FALSE;
    }

}