/**
 * Delete pages and all related data
 *
 * @param mixed $context context in which page needs to be deleted.
 * @param mixed $pageids id's of pages to be deleted
 * @param int $subwikiid id of the subwiki for which all pages should be deleted
 */
function wiki_delete_pages($context, $pageids = null, $subwikiid = null)
{
    global $DB;
    if (!empty($pageids) && is_int($pageids)) {
        $pageids = array($pageids);
    } else {
        if (!empty($subwikiid)) {
            $pageids = wiki_get_page_list($subwikiid);
        }
    }
    //If there is no pageid then return as we can't delete anything.
    if (empty($pageids)) {
        return;
    }
    /// Delete page and all it's relevent data
    foreach ($pageids as $pageid) {
        if (is_object($pageid)) {
            $pageid = $pageid->id;
        }
        //Delete page comments
        $comments = wiki_get_comments($context->id, $pageid);
        foreach ($comments as $commentid => $commentvalue) {
            wiki_delete_comment($commentid, $context, $pageid);
        }
        //Delete page tags
        $tags = tag_get_tags_array('wiki_pages', $pageid);
        foreach ($tags as $tagid => $tagvalue) {
            tag_delete_instance('wiki_pages', $pageid, $tagid);
        }
        //Delete Synonym
        wiki_delete_synonym($subwikiid, $pageid);
        //Delete all page versions
        wiki_delete_page_versions(array($pageid => array(0)));
        //Delete all page locks
        wiki_delete_locks($pageid);
        //Delete all page links
        wiki_delete_links(null, $pageid);
        //Delete page
        $params = array('id' => $pageid);
        $DB->delete_records('wiki_pages', $params);
    }
}

/**
 * Delete pages and all related data
 *
 * @param mixed $context context in which page needs to be deleted.
 * @param mixed $pageids id's of pages to be deleted
 * @param int $subwikiid id of the subwiki for which all pages should be deleted
 */
function wiki_delete_pages($context, $pageids = null, $subwikiid = null)
{
    global $DB, $CFG;
    if (!empty($pageids) && is_int($pageids)) {
        $pageids = array($pageids);
    } else {
        if (!empty($subwikiid)) {
            $pageids = wiki_get_page_list($subwikiid);
        }
    }
    //If there is no pageid then return as we can't delete anything.
    if (empty($pageids)) {
        return;
    }
    /// Delete page and all it's relevent data
    foreach ($pageids as $pageid) {
        if (is_object($pageid)) {
            $pageid = $pageid->id;
        }
        //Delete page comments
        $comments = wiki_get_comments($context->id, $pageid);
        foreach ($comments as $commentid => $commentvalue) {
            wiki_delete_comment($commentid, $context, $pageid);
        }
        //Delete page tags
        core_tag_tag::remove_all_item_tags('mod_wiki', 'wiki_pages', $pageid);
        //Delete Synonym
        wiki_delete_synonym($subwikiid, $pageid);
        //Delete all page versions
        wiki_delete_page_versions(array($pageid => array(0)), $context);
        //Delete all page locks
        wiki_delete_locks($pageid);
        //Delete all page links
        wiki_delete_links(null, $pageid);
        $params = array('id' => $pageid);
        // Get page before deleting.
        $page = $DB->get_record('wiki_pages', $params);
        //Delete page
        $DB->delete_records('wiki_pages', $params);
        // Trigger page_deleted event.
        $event = \mod_wiki\event\page_deleted::create(array('context' => $context, 'objectid' => $pageid, 'other' => array('subwikiid' => $subwikiid)));
        $event->add_record_snapshot('wiki_pages', $page);
        $event->trigger();
    }
}

    function print_content() {
        global $CFG, $OUTPUT, $USER, $PAGE;
        require_once($CFG->dirroot . '/mod/wiki/locallib.php');

        $page = $this->page;
        $subwiki = $this->subwiki;
        $wiki = $PAGE->activityrecord;
        list($context, $course, $cm) = get_context_info_array($this->modcontext->id);

        require_capability('mod/wiki:viewcomment', $this->modcontext, NULL, true, 'noviewcommentpermission', 'wiki');

        $comments = wiki_get_comments($this->modcontext->id, $page->id);

        if (has_capability('mod/wiki:editcomment', $this->modcontext)) {
            echo '<div class="midpad"><a href="' . $CFG->wwwroot . '/mod/wiki/editcomments.php?action=add&amp;pageid=' . $page->id . '">' . get_string('addcomment', 'wiki') . '</a></div>';
        }

        $options = array('swid' => $this->page->subwikiid, 'pageid' => $page->id);
        $version = wiki_get_current_version($this->page->id);
        $format = $version->contentformat;

        if (empty($comments)) {
            echo $OUTPUT->heading(get_string('nocomments', 'wiki'));
        }

        foreach ($comments as $comment) {

            $user = wiki_get_user_info($comment->userid);

            $fullname = fullname($user, has_capability('moodle/site:viewfullnames', context_course::instance($course->id)));
            $by = new stdclass();
            $by->name = '<a href="' . $CFG->wwwroot . '/user/view.php?id=' . $user->id . '&amp;course=' . $course->id . '">' . $fullname . '</a>';
            $by->date = userdate($comment->timecreated);

            $t = new html_table();
            $cell1 = new html_table_cell($OUTPUT->user_picture($user, array('popup' => true)));
            $cell2 = new html_table_cell(get_string('bynameondate', 'forum', $by));
            $cell3 = new html_table_cell();
            $cell3->atributtes ['width'] = "80%";
            $cell4 = new html_table_cell();
            $cell5 = new html_table_cell();

            $row1 = new html_table_row();
            $row1->cells[] = $cell1;
            $row1->cells[] = $cell2;
            $row2 = new html_table_row();
            $row2->cells[] = $cell3;

            if ($format != 'html') {
                if ($format == 'creole') {
                    $parsedcontent = wiki_parse_content('creole', $comment->content, $options);
                } else if ($format == 'nwiki') {
                    $parsedcontent = wiki_parse_content('nwiki', $comment->content, $options);
                }

                $cell4->text = format_text(html_entity_decode($parsedcontent['parsed_text'], ENT_QUOTES, 'UTF-8'), FORMAT_HTML);
            } else {
                $cell4->text = format_text($comment->content, FORMAT_HTML);
            }

            $row2->cells[] = $cell4;

            $t->data = array($row1, $row2);

            $actionicons = false;
            if ((has_capability('mod/wiki:managecomment', $this->modcontext))) {
                $urledit = new moodle_url('/mod/wiki/editcomments.php', array('commentid' => $comment->id, 'pageid' => $page->id, 'action' => 'edit'));
                $urldelet = new moodle_url('/mod/wiki/instancecomments.php', array('commentid' => $comment->id, 'pageid' => $page->id, 'action' => 'delete'));
                $actionicons = true;
            } else if ((has_capability('mod/wiki:editcomment', $this->modcontext)) and ($USER->id == $user->id)) {
                $urledit = new moodle_url('/mod/wiki/editcomments.php', array('commentid' => $comment->id, 'pageid' => $page->id, 'action' => 'edit'));
                $urldelet = new moodle_url('/mod/wiki/instancecomments.php', array('commentid' => $comment->id, 'pageid' => $page->id, 'action' => 'delete'));
                $actionicons = true;
            }

            if ($actionicons) {
                $cell6 = new html_table_cell($OUTPUT->action_icon($urledit, new pix_icon('t/edit', get_string('edit'),
                        '', array('class' => 'iconsmall'))) . $OUTPUT->action_icon($urldelet, new pix_icon('t/delete',
                        get_string('delete'), '', array('class' => 'iconsmall'))));
                $row3 = new html_table_row();
                $row3->cells[] = $cell5;
                $row3->cells[] = $cell6;
                $t->data[] = $row3;
            }

            echo html_writer::tag('div', html_writer::table($t), array('class'=>'no-overflow'));

        }
    }

 /**
  * Test comment_deleted event.
  */
 public function test_comment_deleted()
 {
     $this->setUp();
     $page = $this->wikigenerator->create_first_page($this->wiki);
     $context = context_module::instance($this->wiki->cmid);
     // Add comment so we can delete it later.
     wiki_add_comment($context, $page->id, 'Test comment', 'html');
     $comment = wiki_get_comments($context->id, $page->id);
     $this->assertCount(1, $comment);
     $comment = array_shift($comment);
     // Triggering and capturing the event.
     $sink = $this->redirectEvents();
     wiki_delete_comment($comment->id, $context, $page->id);
     $events = $sink->get_events();
     $this->assertCount(1, $events);
     $event = reset($events);
     // Checking that the event contains the expected values.
     $this->assertInstanceOf('\\mod_wiki\\event\\comment_deleted', $event);
     $this->assertEquals($context, $event->get_context());
     $this->assertEquals($page->id, $event->other['itemid']);
     $this->assertEventContextNotUsed($event);
 }