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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.
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/**
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 * Defines classes used for plugin info.
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 *
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 * @package    core
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 * @copyright  2011 David Mudrak <david@moodle.com>
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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 */
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namespace core\plugininfo;
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use core_plugin_manager;
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use moodle_url;
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/**
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 * Class for question behaviours.
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 */
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class qbehaviour extends base {
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    public static function plugintype_supports_disabling(): bool {
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        return true;
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    }
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    /**
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     * Finds all enabled plugins, the result may include missing plugins.
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     * @return array|null of enabled plugins $pluginname=>$pluginname, null means unknown
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     */
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    public static function get_enabled_plugins() {
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        $plugins = core_plugin_manager::instance()->get_installed_plugins('qbehaviour');
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        if (!$plugins) {
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            return array();
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        }
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        if ($disabled = get_config('question', 'disabledbehaviours')) {
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            $disabled = explode(',', $disabled);
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        } else {
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            $disabled = array();
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        }
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        $enabled = array();
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        foreach ($plugins as $plugin => $version) {
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            if (in_array($plugin, $disabled)) {
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                continue;
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            }
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            $enabled[$plugin] = $plugin;
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        }
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        return $enabled;
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    }
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    public static function enable_plugin(string $pluginname, int $enabled): bool {
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        $haschanged = false;
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        $plugins = [];
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        $oldvalue = get_config('question', 'disabledbehaviours');
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        if (!empty($oldvalue)) {
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            $plugins = array_flip(explode(',', $oldvalue));
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        }
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        // Only set visibility if it's different from the current value.
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        if ($enabled && array_key_exists($pluginname, $plugins)) {
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            unset($plugins[$pluginname]);
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            $haschanged = true;
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        } else if (!$enabled && !array_key_exists($pluginname, $plugins)) {
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            $plugins[$pluginname] = $pluginname;
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            $haschanged = true;
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        }
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        if ($haschanged) {
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            $new = implode(',', array_flip($plugins));
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            add_to_config_log('disabledbehaviours', $oldvalue, $new, 'question');
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            set_config('disabledbehaviours', $new, 'question');
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            // Reset caches.
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            \core_plugin_manager::reset_caches();
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        }
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        return $haschanged;
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    }
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    public function is_uninstall_allowed() {
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        global $DB;
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        if ($this->name === 'missing') {
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            // qbehaviour_missing is used by the system. It cannot be uninstalled.
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            return false;
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        }
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        return !$DB->record_exists('question_attempts', array('behaviour' => $this->name));
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    }
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    /**
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     * Pre-uninstall hook.
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     *
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     * This is intended for disabling of plugin, some DB table purging, etc.
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     *
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     * NOTE: to be called from uninstall_plugin() only.
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     * @private
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     */
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    public function uninstall_cleanup() {
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        if ($disabledbehaviours = get_config('question', 'disabledbehaviours')) {
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            $disabledbehaviours = explode(',', $disabledbehaviours);
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            $disabledbehaviours = array_unique($disabledbehaviours);
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        } else {
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            $disabledbehaviours = array();
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        }
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        if (($key = array_search($this->name, $disabledbehaviours)) !== false) {
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            unset($disabledbehaviours[$key]);
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            set_config('disabledbehaviours', implode(',', $disabledbehaviours), 'question');
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        }
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        if ($behaviourorder = get_config('question', 'behavioursortorder')) {
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            $behaviourorder = explode(',', $behaviourorder);
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            $behaviourorder = array_unique($behaviourorder);
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        } else {
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            $behaviourorder = array();
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        }
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        if (($key = array_search($this->name, $behaviourorder)) !== false) {
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            unset($behaviourorder[$key]);
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            set_config('behavioursortorder', implode(',', $behaviourorder), 'question');
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        }
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        parent::uninstall_cleanup();
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    }
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    /**
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     * Return URL used for management of plugins of this type.
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     * @return moodle_url
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     */
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    public static function get_manage_url() {
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        return new moodle_url('/admin/qbehaviours.php');
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    }
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}