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<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Admin Bookmarks Block page.
 *
 * @package    block_admin_bookmarks
 * @copyright  2011 Moodle
 * @author     2006 vinkmar
 *             2011 Rossiani Wijaya (updated)
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * The admin bookmarks block class
 */
class block_admin_bookmarks extends block_base {

/** @var string */
    public $blockname = null;

/** @var bool */
    protected $contentgenerated = false;

/** @var bool|null */
    protected $docked = null;

/**
     * Set the initial properties for the block
     */
    function init() {
        $this->blockname = get_class($this);
        $this->title = get_string('pluginname', $this->blockname);
    }

/**
     * All multiple instances of this block
     * @return bool Returns false
     */
    function instance_allow_multiple() {
        return false;
    }

/**
     * Set the applicable formats for this block to all
     * @return array
     */
    function applicable_formats() {
        if (has_capability('moodle/site:config', context_system::instance())) {
            return array('all' => true);
        } else {
            return array('site' => true);
        }
    }

/**
     * Gets the content for this block
     */
    function get_content() {

global $CFG;

// First check if we have already generated, don't waste cycles
        if ($this->contentgenerated === true) {
            return $this->content;
        }
        $this->content = new stdClass();

if (get_user_preferences('admin_bookmarks')) {
            require_once($CFG->libdir.'/adminlib.php');
            $adminroot = admin_get_root(false, false);  // settings not required - only pages

$bookmarks = explode(',', get_user_preferences('admin_bookmarks'));
            /// Accessibility: markup as a list.
            $contents = array();
            foreach($bookmarks as $bookmark) {
                $temp = $adminroot->locate($bookmark);
                if ($temp instanceof admin_settingpage) {
                    $contenturl = new moodle_url('/admin/settings.php', array('section'=>$bookmark));
                    $contentlink = html_writer::link($contenturl, $temp->visiblename);
                    $contents[] = html_writer::tag('li', $contentlink);
                } else if ($temp instanceof admin_externalpage) {
                    $contenturl = new moodle_url($temp->url);
                    $contentlink = html_writer::link($contenturl, $temp->visiblename);
                    $contents[] = html_writer::tag('li', $contentlink);
                } else if ($temp instanceof admin_category) {
                    $contenturl = new moodle_url('/admin/category.php', array('category' => $bookmark));
                    $contentlink = html_writer::link($contenturl, $temp->visiblename);
                    $contents[] = html_writer::tag('li', $contentlink);
                }
            }
            $this->content->text = html_writer::tag('ol', implode('', $contents), array('class' => 'list'));
        } else {
            $bookmarks = array();
        }

$this->content->footer = '';
        $this->page->settingsnav->initialise();
        $node = $this->page->settingsnav->get('root', navigation_node::TYPE_SITE_ADMIN);
        if (!$node || !$node->contains_active_node()) {
            return $this->content;
        }
        $section = $node->find_active_node()->key;

if ($section == 'search' || empty($section)){
            // the search page can't be properly bookmarked at present
            $this->content->footer = '';
        } else if (in_array($section, $bookmarks)) {
            $deleteurl = new moodle_url('/blocks/admin_bookmarks/delete.php', array('section'=>$section, 'sesskey'=>sesskey()));
            $this->content->footer =  html_writer::link($deleteurl, get_string('unbookmarkthispage','admin'));
        } else {
            $createurl = new moodle_url('/blocks/admin_bookmarks/create.php', array('section'=>$section, 'sesskey'=>sesskey()));
            $this->content->footer = html_writer::link($createurl, get_string('bookmarkthispage','admin'));
        }

return $this->content;
    }

/**
     * Returns the role that best describes the admin bookmarks block.
     *
     * @return string
     */
    public function get_aria_role() {
        return 'navigation';
    }
}