<?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/>.

/**
 * Delete admin bookmarks.
 *
 * @package    block_admin_bookmarks
 * @copyright  2006 vinkmar
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

require('../../config.php');

require_once($CFG->libdir.'/adminlib.php');

require_login();
$context = context_system::instance();
$PAGE->set_context($context);
$adminroot = admin_get_root(false, false); // settings not required - only pages

// We clean section with safe path here for compatibility with external pages that include a slash in their name.
if ($section = optional_param('section', '', PARAM_SAFEPATH) and confirm_sesskey()) {

    if (get_user_preferences('admin_bookmarks')) {

        $bookmarks = explode(',', get_user_preferences('admin_bookmarks'));

        $key = array_search($section, $bookmarks);

        if ($key === false) {
            throw new \moodle_exception('nonexistentbookmark', 'admin');
            die;
        }

        unset($bookmarks[$key]);
        $bookmarks = implode(',', $bookmarks);
        set_user_preference('admin_bookmarks', $bookmarks);

        $temp = $adminroot->locate($section);

        if ($temp instanceof admin_externalpage) {
            redirect($temp->url, get_string('bookmarkdeleted','admin'));
        } elseif ($temp instanceof admin_settingpage) {
            redirect($CFG->wwwroot . '/' . $CFG->admin . '/settings.php?section=' . $section);
        } else if ($temp instanceof admin_category) {
            redirect($CFG->wwwroot . '/' . $CFG->admin . '/category.php?category=' . $section);
        } else {
            redirect($CFG->wwwroot);
        }
        die;


    }

    throw new \moodle_exception('nobookmarksforuser', 'admin');
    die;

} else {
    throw new \moodle_exception('invalidsection', 'admin');
    die;
}